/* START ************************************************************/
/* OBS måste ligga högst upp för att kunna användas längre ned i koden */

// Ungefär som PHPs sprintf funktion för att ersätta i strängar
//console.log("{0} is dead, but {1} is alive! {0} {2}".sprintf("ASP", "ASP.NET"));
String.prototype.sprintf = function () {
  var args = arguments;
  return this.replace(/{(\d+)}/g, function (match, number) {
    return typeof args[number] != 'undefined' ?
      args[number] :
      match;
  });
};

function sprintf() {
  //	discuss at: http://phpjs.org/functions/sprintf/
  // original by: Ash Searle (http://hexmen.com/blog/)
  // improved by: Michael White (http://getsprink.com)
  // improved by: Jack
  // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: Dj
  // improved by: Allidylls
  //		input by: Paulo Freitas
  //		input by: Brett Zamir (http://brett-zamir.me)
  //	 example 1: sprintf("%01.2f", 123.1);
  //	 returns 1: 123.10
  //	 example 2: sprintf("[%10s]", 'monkey');
  //	 returns 2: '[		monkey]'
  //	 example 3: sprintf("[%'#10s]", 'monkey');
  //	 returns 3: '[####monkey]'
  //	 example 4: sprintf("%d", 123456789012345);
  //	 returns 4: '123456789012345'
  //	 example 5: sprintf('%-03s', 'E');
  //	 returns 5: 'E00'

  var regex = /%%|%(\d+\$)?([-+\'#0 ]*)(\*\d+\$|\*|\d+)?(\.(\*\d+\$|\*|\d+))?([scboxXuideEfFgG])/g;
  var a = arguments;
  var i = 0;
  var format = a[i++];

  // pad()
  var pad = function (str, len, chr, leftJustify) {
    if (!chr) {
      chr = ' ';
    }
    var padding = (str.length >= len) ? '' : new Array(1 + len - str.length >>> 0)
      .join(chr);
    return leftJustify ? str + padding : padding + str;
  };

  // justify()
  var justify = function (value, prefix, leftJustify, minWidth, zeroPad, customPadChar) {
    var diff = minWidth - value.length;
    if (diff > 0) {
      if (leftJustify || !zeroPad) {
        value = pad(value, minWidth, customPadChar, leftJustify);
      } else {
        value = value.slice(0, prefix.length) + pad('', diff, '0', true) + value.slice(prefix.length);
      }
    }
    return value;
  };

  // formatBaseX()
  var formatBaseX = function (value, base, prefix, leftJustify, minWidth, precision, zeroPad) {
    // Note: casts negative numbers to positive ones
    var number = value >>> 0;
    prefix = prefix && number && {
      '2': '0b',
      '8': '0',
      '16': '0x'
    }[base] || '';
    value = prefix + pad(number.toString(base), precision || 0, '0', false);
    return justify(value, prefix, leftJustify, minWidth, zeroPad);
  };

  // formatString()
  var formatString = function (value, leftJustify, minWidth, precision, zeroPad, customPadChar) {
    if (precision != null) {
      value = value.slice(0, precision);
    }
    return justify(value, '', leftJustify, minWidth, zeroPad, customPadChar);
  };

  // doFormat()
  var doFormat = function (substring, valueIndex, flags, minWidth, _, precision, type) {
    var number, prefix, method, textTransform, value;

    if (substring === '%%') {
      return '%';
    }

    // parse flags
    var leftJustify = false;
    var positivePrefix = '';
    var zeroPad = false;
    var prefixBaseX = false;
    var customPadChar = ' ';
    var flagsl = flags.length;
    for (var j = 0; flags && j < flagsl; j++) {
      switch (flags.charAt(j)) {
        case ' ':
          positivePrefix = ' ';
          break;
        case '+':
          positivePrefix = '+';
          break;
        case '-':
          leftJustify = true;
          break;
        case "'":
          customPadChar = flags.charAt(j + 1);
          break;
        case '0':
          zeroPad = true;
          customPadChar = '0';
          break;
        case '#':
          prefixBaseX = true;
          break;
      }
    }

    // parameters may be null, undefined, empty-string or real valued
    // we want to ignore null, undefined and empty-string values
    if (!minWidth) {
      minWidth = 0;
    } else if (minWidth === '*') {
      minWidth = +a[i++];
    } else if (minWidth.charAt(0) == '*') {
      minWidth = +a[minWidth.slice(1, -1)];
    } else {
      minWidth = +minWidth;
    }

    // Note: undocumented perl feature:
    if (minWidth < 0) {
      minWidth = -minWidth;
      leftJustify = true;
    }

    if (!isFinite(minWidth)) {
      throw new Error('sprintf: (minimum-)width must be finite');
    }

    if (!precision) {
      precision = 'fFeE'.indexOf(type) > -1 ? 6 : (type === 'd') ? 0 : undefined;
    } else if (precision === '*') {
      precision = +a[i++];
    } else if (precision.charAt(0) == '*') {
      precision = +a[precision.slice(1, -1)];
    } else {
      precision = +precision;
    }

    // grab value using valueIndex if required?
    value = valueIndex ? a[valueIndex.slice(0, -1)] : a[i++];

    switch (type) {
      case 's':
        return formatString(String(value), leftJustify, minWidth, precision, zeroPad, customPadChar);
      case 'c':
        return formatString(String.fromCharCode(+value), leftJustify, minWidth, precision, zeroPad);
      case 'b':
        return formatBaseX(value, 2, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
      case 'o':
        return formatBaseX(value, 8, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
      case 'x':
        return formatBaseX(value, 16, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
      case 'X':
        return formatBaseX(value, 16, prefixBaseX, leftJustify, minWidth, precision, zeroPad)
          .toUpperCase();
      case 'u':
        return formatBaseX(value, 10, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
      case 'i':
      case 'd':
        number = +value || 0;
        // Plain Math.round doesn't just truncate
        number = Math.round(number - number % 1);
        prefix = number < 0 ? '-' : positivePrefix;
        value = prefix + pad(String(Math.abs(number)), precision, '0', false);
        return justify(value, prefix, leftJustify, minWidth, zeroPad);
      case 'e':
      case 'E':
      case 'f': // Should handle locales (as per setlocale)
      case 'F':
      case 'g':
      case 'G':
        number = +value;
        prefix = number < 0 ? '-' : positivePrefix;
        method = ['toExponential', 'toFixed', 'toPrecision']['efg'.indexOf(type.toLowerCase())];
        textTransform = ['toString', 'toUpperCase']['eEfFgG'.indexOf(type) % 2];
        value = prefix + Math.abs(number)[method](precision);
        return justify(value, prefix, leftJustify, minWidth, zeroPad)[textTransform]();
      default:
        return substring;
    }
  };

  return format.replace(regex, doFormat);
}

function parse_url(str, component) {
  // http://kevin.vanzonneveld.net
  // +			original by: Steven Levithan (http://blog.stevenlevithan.com)
  // + reimplemented by: Brett Zamir (http://brett-zamir.me)
  // + input by: Lorenzo Pisani
  // + input by: Tony
  // + improved by: Brett Zamir (http://brett-zamir.me)
  // %					note: Based on http://stevenlevithan.com/demo/parseuri/js/assets/parseuri.js
  // %					note: blog post at http://blog.stevenlevithan.com/archives/parseuri
  // %					note: demo at http://stevenlevithan.com/demo/parseuri/js/assets/parseuri.js
  // %					note: Does not replace invalid characters with '_' as in PHP, nor does it return false with
  // %					note: a seriously malformed URL.
  // %					note: Besides function name, is essentially the same as parseUri as well as our allowing
  // %					note: an extra slash after the scheme/protocol (to allow file:/// as in PHP)
  // *		 example 1: parse_url('http://username:password@hostname/path?arg=value#anchor');
  // *		 returns 1: {scheme: 'http', host: 'hostname', user: 'username', pass: 'password', path: '/path', query: 'arg=value', fragment: 'anchor'}
  var query, key = ['source', 'scheme', 'authority', 'userInfo', 'user', 'pass', 'host', 'port',
      'relative', 'path', 'directory', 'file', 'query', 'fragment'
    ],
    ini = (this.php_js && this.php_js.ini) || {},
    mode = (ini['phpjs.parse_url.mode'] &&
      ini['phpjs.parse_url.mode'].local_value) || 'php',
    parser = {
      php: /^(?:([^:\/?#]+):)?(?:\/\/()(?:(?:()(?:([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?))?()(?:(()(?:(?:[^?#\/]*\/)*)()(?:[^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
      strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
      loose: /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/\/?)?((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/ // Added one optional slash to post-scheme to catch file:/// (should restrict this)
    };

  var m = parser[mode].exec(str),
    uri = {},
    i = 14;
  while (i--) {
    if (m[i]) {
      uri[key[i]] = m[i];
    }
  }

  if (component) {
    return uri[component.replace('PHP_URL_', '').toLowerCase()];
  }
  if (mode !== 'php') {
    var name = (ini['phpjs.parse_url.queryKey'] &&
      ini['phpjs.parse_url.queryKey'].local_value) || 'queryKey';
    parser = /(?:^|&)([^&=]*)=?([^&]*)/g;
    uri[name] = {};
    query = uri[key[12]] || '';
    query.replace(parser, function ($0, $1, $2) {
      if ($1) {
        uri[name][$1] = $2;
      }
    });
  }
  delete uri.source;
  return uri;
}

/*	Tvärtom mot jquerys param-funktion
  T.ex för att hämta ut en querystring
  var qstr = window.location.search;
  var q = deparam(test);
  console.log(q);
*/
deparam = (function (d, x, params, pair, i) {
  return function (qs) {
    // start bucket; can't cheat by setting it in scope declaration or it overwrites
    params = {};
    // remove preceding non-querystring, correct spaces, and split
    qs = qs.substring(qs.indexOf('?') + 1).replace(x, ' ').split('&');
    // march and parse
    for (i = qs.length; i > 0;) {
      pair = qs[--i].split('=');
      params[d(pair[0])] = d(pair[1]);
    }

    return params;
  }; //--	fn	deparam
})(decodeURIComponent, /\+/g);

/*
  Parsar en URL och skickar tillbaka allting i ett objekt
  T.ex http://xpectum.localhost/edit.php?id=195#test=1
  {
      "query": {
          "id": "195"
      },
      "path": "/edit.php",
      "host": "xpectum.localhost",
      "scheme": "http",
      "fragment": {
          "test": "1"
      }
  }
*/
function parse_and_get_url(url) {
  url = parse_url(url);

  query = (typeof url.query != "undefined" ? deparam(url.query) : new Object());
  hash = (typeof url.fragment != "undefined" ? deparam(url.fragment) : new Object());

  url.query = query;
  url.fragment = hash;

  return url;
}

// Execute a JavaScript function by name as a string
// http://stackoverflow.com/questions/359788/how-to-execute-a-javascript-function-when-i-have-its-name-as-a-string/359910#359910
function execute_function_by_name(function_name, context /*, args */ ) {
  var args = Array.prototype.slice.call(arguments, 2);
  var namespaces = function_name.split(".");
  var func = namespaces.pop();
  for (var i = 0; i < namespaces.length; i++) {
    context = context[namespaces[i]];
  }
  if (typeof context[func] == "function") {
    return context[func].apply(context, args);
  }
}

// Konverterar newline (\n) till "<br/>"
function nl2br(str) {
  return str.replace(/\n/g, "<br>");
};

// Konverterar "<br/>" till newline (\n)
function br2nl(str) {
  return str.replace(/<br\s*[\\]*[\/]*?>/gi, "\n");
  //return str.replace(/<br\s*\/?>/mg,"\n");
  //return str.replace(/<br ?\/?>/gi, "\n");
};

/* SLUT ************************************************************/

//<script src="https://www.youtube.com/iframe_api"></script> //youtube API
//<script src="https://player.vimeo.com/api/player.js"></script> //vimeo API
load_js_for_page_via_getscript("https://player.vimeo.com/api/player.js");
load_js_for_page_via_getscript("jsVideoUrlParser/jsVideoUrlParser.min.js", "../../js/plugins/");

// Laddar in eventuella JS-filer
function load_js_for_page_via_getscript(js_urls, path) {
  // Kollar om det finns js script som ska laddas
  if (!$.isEmptyObject(js_urls)) {
    var urls = js_urls.split(',');
    var _urls = $.map(urls, function(scr) {
      return $.getScript( (path||"") + scr );
    });
    //console.log(_urls);

    urls.push($.Deferred(function( deferred ){
      $( deferred.resolve );
    }));

    return $.when.apply($, _urls);
  } else {
    // Finns inga script att ladda, retunerar en solved promise
    $.Deferred(function( deferred ){
      $( deferred.resolve );
    })
    return $.when.apply($, js_urls);
  }
}

// Laddar js-script, eller json osv för en sida
function load_js_for_page_via_ajax(js_url, callback) {
  callback = typeof callback !== 'undefined' ? callback : false;

  var js_urls = js_url.split(',');

  $.each(js_urls, function (js_url_key, js_url) {

    $.ajax({
        url: js_url
      })
      .done(function (jqXHR, textStatus) {
        //console.log("scriptet '" + js_url + "' har laddats")
        if (callback) {
          callback(jqXHR, $(this)[0].dataTypes);
        }
      })
      .fail(function (jqXHR, textStatus, errorThrown) {
        //console.log($(jqXHR.responseText).text());

        // Kollar om felmeddelande innnehåller HTML och konvertar det i så fall till text
        if ($(jqXHR.responseText).length > 0) {
          var responseText = $(jqXHR.responseText).text();
        } else {
          var responseText = jqXHR.responseText;
        }

        switch (jqXHR.status) {
          case 0:
            error_text = "Could not connect.\n Verify Network.";
            break;
          case 404:
            error_text = "Page not found [404].";
            break;
          case 500:
            error_text = "Internal Server Error [500].";
            break;
          default:
            error_text = textStatus + ". " + errorThrown + ". " + responseText;
        }
        $("#course_page_content").html("<p>" + error_text + "</p><p>" + errorThrown + ".<br/>" + responseText + "</p>");
      });
  });
}

// Laddar en eller flera css för en sida
function load_css_for_page(css_urls, callback, nocache) {
  if (!$.isEmptyObject(css_urls)) {
    var urls = css_urls.split(",");

    var css_urls_existing = [];
    var $page_styles = $('.page_styles');

    // Hömtar existrerade stylesheet som redan är laddade
    $.each($page_styles, function (style_key, style) {
      css_urls_existing.push( $(style).attr('href') );
    });

    // Kollar vilka stylesheet som inte redan finns och behöver ladds
    var urls_to_load = [];
    $.each(urls, function (url_key, url) {
      if( $.inArray(url, css_urls_existing) == -1 ) {
        urls_to_load.push(url);
      }
    });

    if (typeof nocache=='undefined') nocache=false; // default don't refresh
    $.when.apply($,
      $.map(urls_to_load, function(url){
        if (nocache) url += '?_ts=' + new Date().getTime(); // refresh?
        return $.get(url, function(){
          $('<link>', {rel:'stylesheet', type:'text/css', 'href':url, class:'page_styles'}).appendTo('head');
        });

      })
    ).then(function(){
      if (typeof callback=='function') callback();
    });
  } else {
    callback();
  }
}

// Kollar vilka stylesheet som inte ska användas och tar bort dom
function remove_unused_css_for_page(css_urls_to_load) {
  var urls = [];
  if (!$.isEmptyObject(css_urls_to_load)) {
    urls = css_urls_to_load.split(",");
  }
  var css_urls_existing = [];
  var $page_styles = $('.page_styles');

   // Hömtar existrerade stylesheet som redan är laddade
  $.each($page_styles, function (style_key, style) {
    css_urls_existing.push( $(style).attr('href') );
  });
  // Tar ut skillnaden av vilka stylesheet som finns och vilka som ska vara kvar
  var css_urls_to_remove = $(css_urls_existing).not(urls).get();

  // Tar bort de stylesheets som inte ska vara kvar
  $.each($page_styles, function (style_key, style) {
    if( $.inArray($(style).attr('href'), css_urls_to_remove) >= 0 ) {
      $(style).remove();
    }
  })

}

function remove_css_for_page() {
  $('.page_styles').remove();
}

// Hämtar ut filändelse
function get_extension(filename) {
  var lastIndex = filename.lastIndexOf('.');
  var name = filename.substr(0, lastIndex).toLowerCase();
  var extension = filename.split('.').pop().toLowerCase();
  var file_info = {
    "name": name,
    "extension": extension
  };
  return file_info;
}

// Sättar att en sida är visad och uppdaterar datumet och hur länge man varit inne på sidan, eller sätter en sida som ej visad och tar bort datumet och tiden visad
/*function set_page_viewed(pagekey, viewed)
{
  user_log.pages[pagekey].viewed = viewed;

  if(viewed)
  {
    user_log.pages[pagekey].date_viewed = get_and_format_date("", 3)
    user_log.pages[pagekey].time_visited += 0;
  }
  else
  {
    user_log.pages[pagekey].date_viewed = "";
    user_log.pages[pagekey].time_visited = 0;
  }
}*/

// Kollar om man är i kursen eller i editorn genom att se om kursstruktiuren är definierad
function is_in_course_or_editor() {
  var is_in_course_or_editor = 'editor';
  if (course.pages != undefined) {
    is_in_course_or_editor = 'course'
  }
  return is_in_course_or_editor;
}

function get_and_format_date(thedate, return_type) {
  var return_date;

  if (thedate == "") {
    var thedate = new Date();
  }

  if (!is_valid_date(thedate)) {
    var thedate = new Date(Date.parse(thedate));
  }

  if (is_valid_date(thedate)) {
    var dd = thedate.getDate();
    var mm = thedate.getMonth() + 1; //Januari är 0
    var hh = thedate.getHours();
    var min = thedate.getMinutes();
    var sec = thedate.getSeconds();

    var yyyy = thedate.getFullYear();
    if (dd < 10) {
      dd = '0' + dd
    }
    if (mm < 10) {
      mm = '0' + mm
    }
    if (hh < 10) {
      hh = '0' + hh
    }
    if (min < 10) {
      min = '0' + min
    }
    if (sec < 10) {
      sec = '0' + sec
    }

    switch (return_type) {
      case 1: // Datumobjekt
        var return_date = thedate; //new Date(yyyy, mm, dd, hh, min, sec);
        break;
      case 2: // Sträng
        var return_date = yyyy + "-" + mm + "-" + dd + " " + hh + ":" + min + ":" + sec;
        break;
      case 3: // ISO 8601 YYYY-MM-DDThh:mm:ssTZD
        var return_date = yyyy + "-" + mm + "-" + dd + "T" + hh + ":" + min + ":" + sec + "+01:00";
        break;
      default: // Sträng
        var return_date = yyyy + "-" + mm + "-" + dd + " " + hh + ":" + min + ":" + sec;
    }
  } else {
    // ogiltigt datum
    return_date = -1;
  }

  return return_date;

}

function is_valid_date(d) {
  if (Object.prototype.toString.call(d) !== "[object Date]")
    return false;
  return !isNaN(d.getTime());
}

// Sortera en "associative array", egentligen ett objekt
function by_sorted_value(obj, callback, context) {
  var tuples = [];

  for (var key in obj) tuples.push([key, obj[key]]);

  tuples.sort(function (a, b) {
    return a[1] < b[1] ? 1 : a[1] > b[1] ? -1 : 0
  });

  var length = tuples.length;
  while (length--) callback.call(context, tuples[length][0], tuples[length][1]);
}

/*
  // Dynamic sort function that sorts objects by their value that you pass
  var People = [
      {Name: "Name", Surname: "Surname"},
      {Name:"AAA", Surname:"ZZZ"},
      {Name: "Name", Surname: "AAA"}
  ];
  ...and it will work when you do:
  People.sort(dynamicSort("Name"));
  People.sort(dynamicSort("Surname"));
  People.sort(dynamicSort("-Surname"));
*/
function dynamic_sort(property) {
  var sortOrder = 1;
  if (property[0] === "-") {
    sortOrder = -1;
    property = property.substr(1);
  }
  return function (a, b) {
    var result = (a[property] < b[property]) ? -1 : (a[property] > b[property]) ? 1 : 0;
    return result * sortOrder;
  }
}

/*
  // Dynamic sort function that sorts objects by their value that you pass
  var People = [
      {Name: "Name", Surname: "Surname"},
      {Name:"AAA", Surname:"ZZZ"},
      {Name: "Name", Surname: "AAA"}
  ];
  ...and it will work when you do:
  People.sort(dynamicSortMultiple("Name", "-Surname"))
*/
function dynamic_sort_multiple() {
  /*
   * save the arguments object as it will be overwritten
   * note that arguments object is an array-like object
   * consisting of the names of the properties to sort by
   */
  var props = arguments;
  return function (obj1, obj2) {
    var i = 0,
      result = 0,
      numberOfProperties = props.length;
    /* try getting a different result from 0 (equal)
     * as long as we have extra properties to compare
     */
    while (result === 0 && i < numberOfProperties) {
      result = dynamicSort(props[i])(obj1, obj2);
      i++;
    }
    return result;
  }
}

/*
function date_diff(date1, date2) {
    return date1.getTime() - date2.getTime();
}
*/

// Hämtar en sida i kursen
function get_page_for_course(page) {
  var counter = 0;
  var return_page = -1;

  // Loopar igenom kursstrukturen
  $.each(course.pages, function (key, value) {
    //console.log(key + ": " + value);

    if (counter == page || value.name == page) {
      return_page = value;
      return false;
    }

    counter++;
  });

  return return_page;
}



/*console.log(myself(10));
function myself (n) {
    if (n <= 1) {
        return 1;
    }
    return n * myself(n-1);
}*/

// Skapar en ny kurslogg
function set_new_user_log(user_log) {
  if (!preview) {
    var course_id = course_info.published_info.course_id_kursstart;
    var exam_id = course_info.published_info.course_id_kursstart;

    ajax_load("../../courses_shared/set_user_log.php?course_id=" + course_id + "&exam_id=" + exam_id, {
      type: "insert",
      user_log: user_log,
      total_course_time: 0
    }, function (data) {
      //console.log(data);
    });
  } else {
    // Kollar om webbläsaren stödjer localStorage
    if (Modernizr.localstorage) {
      localStorage["user_log_course_" + course_info.course_id] = JSON.stringify(user_log);
    }
  }
}

var ajax_loader_delay = 1000;
var ajax_loader_message_timer = false;
// Visar ajaxloader med eller utan fördröjning. Med fördröjning kan vara bra för snabb uppkoppling då den bara visas om det tar lång tid
function ajax_loader(enable, no_delay) {
  var no_delay = typeof no_delay !== 'undefined' ? no_delay : false;
  clearTimeout(ajax_loader_message_timer);
  if (enable) {
    if( no_delay ) {
      // Utan fördröjning
      $("#ajax_loader_container").fadeIn("fast");
    } else {
      // Med fördröjning
      ajax_loader_message_timer = setTimeout(function () {
        $("#ajax_loader_container").fadeIn("fast");
        clearTimeout(ajax_loader_message_timer);
        ajax_loader_message_timer = false;
      }, ajax_loader_delay);
    }
  } else {
    if (ajax_loader_message_timer)
      clearTimeout(ajax_loader_message_timer);
    ajax_loader_message_timer = false;
    $("#ajax_loader_container").fadeOut("fast");
  }
}

// En generell ajax funktion. Retunerar eventuellt data eller true om det gick bra och false vid fel
function ajax_load(url, post_data, callback) {
  ajax_loader(true);
  $.post(url, post_data)
    .done(function (data, textStatus, jqXHR) {
      ajax_loader(false);
      // Testar om det går att parsa det retunerade datat
      try {
        data = $.parseJSON(data);
      } catch (err) {
        // Kollar om felmeddelande innnehåller HTML och konvertar det i så fall till text
        if ($(jqXHR.responseText).length > 0) {
          var data = {
            status: err + '\n' + $(jqXHR.responseText).text()
          };
        } else {
          var data = {
            status: err + '\n' + jqXHR.responseText
          };
        }
      };

      switch (data.status) {
        case "success": // Allt gick bra
          $('#course_content #page_error').remove();
          callback(data);
          break;
        case "logged_out": // Användaren har blivit utloggad
          var url = parse_and_get_url(window.location);
          window.location = 'https://www.kursstart.se/?session_end=true';
          break;
        default: // Error, something went wrong. Shows error message.
          var error_message = {
            title: i18next.t('theme.error.error'),
            text: i18next.t('theme.error.error_occured') + '\n' + i18next.t("theme.error.error_help_text") + '\n\n'
          };

          // Klonar orginalobjektet så att inte det ändras. Funkar inte att klona med $.extend.
          var page_position = JSON.parse(JSON.stringify(course.pages[current_page_key].position));

          var separator = ' > ';
          var nr_of_submenus = page_position.length - 1;
          var breadcrumbs_trail = [];

          //breadcrumbs_trail.push( '<a href="" data-page-id="' + $element.attr('data-page-id') + '">' + $element.find('a').first().text().replace('•','') + '</a>' );
          for (i = 0; i <= nr_of_submenus; i++) {
            $element = $(escape_for_jquery("#menu" + JSON.stringify(page_position)))
            page_name = $element.find('a').first().text().replace('•', '');
            breadcrumbs_trail.push(page_name);
            page_position.pop();
          }

          // Huvudnivå
          breadcrumbs_trail.push(i18next.t("theme.menu.contents"));

          // Vänder på arrayen så att det visas från huvudmeny och framåt
          breadcrumbs_trail.reverse();

          var post_data = {
            subject: 'Make My Course - Felmeddelande',
            body: nl2br('<h3>' + error_message.title + '</h3><p>Användare: ' + JSON.stringify(user_info, null, 2) + '</p><p>Kurs: ' + course_info.course_id + ': ' + course_info.name + '</p><p>Inträffade här: ' + breadcrumbs_trail.join(separator) + '</p><p>' + error_message.text + i18next.t('theme.error.error_occured') + '\n\n' + data.status + i18next.t("theme.error.error_help_text") + $(jqXHR.responseText).text() + '</p>'),
            from: 'support@makemycourse.com',
            to: 'peter@xpectum.se'
          };
          $.post('../../ajax.log-errors.php', post_data)

          var $page_error = $('#course_content #page_error');
          if ($page_error.length == 0) {
            $('#course_content').prepend('<section id="page_error" class="error_message"><h3>' + error_message.title + '</h3><pre><code style="white-space: break-spaces;">' + nl2br(error_message.text) + '</code></pre></section>');
          } else {
            $('#course_content #page_error').html('<h3>' + error_message.title + '</h3><pre><code style="white-space: break-spaces;">' + nl2br(error_message.text) + '</code></pre>');
          }
          $('#course_content #page_error h3').off('click').on('click', function () {
            $(this).parent().remove();
          });

          return false;
      }
    })
    .fail(function (jqXHR, textStatus, errorThrown) {
      ajax_loader(false);
      var error_message = {
        title: i18next.t('theme.error.error')
      };

      switch (jqXHR.status) {
        case 0:
          error_message.text = i18next.t("theme.error.network") + ' ' + i18next.t("theme.error.error_help_text") + $(jqXHR.responseText).text();
          break;
        case 404:
          error_message.text = i18next.t("theme.error.404") + ' ' + i18next.t("theme.error.error_help_text") + $(jqXHR.responseText).text();
          break;
        case 500:
          error_message.text = i18next.t("theme.error.500") + ' ' + i18next.t("theme.error.error_help_text") + $(jqXHR.responseText).text();
          break;
        default:
          error_message.text = i18next.t("theme.error.unknown") + ' ' + i18next.t("theme.error.error_help_text") + $(jqXHR.responseText).text();
      }

      var $page_error = $('#course_content #page_error');
      if ($page_error.length == 0) {
        $('#course_content').prepend('<section id="page_error" class="error_message"><h3>' + error_message.title + '</h3><pre><code style="white-space: break-spaces;">' + nl2br(error_message.text) + '</code></pre></section>');
      } else {
        $('#course_content #page_error').html('<h3>' + error_message.title + '</h3><pre><code style="white-space: break-spaces;">' + nl2br(error_message.text) + '</code></pre>');
      }
      $('#course_content #page_error h3').off('click').on('click', function () {
        $(this).parent().remove();
      });

      return false;
    });
}

function play_video(video) {
  // Check for flashcard, in that case don't autoplay HTML5 video.
  if($('#page_contents .flashcards_container').length == 0) {
    if (video !== undefined ) { // Funkar inte för t.ex youtube
      // Autospelar om det inte är mobil
      if (!is_ipad()) {
        video.play();
      };
    }
    // Bugg på iPad som gör att bilden i videon fryser och bara ljudet fortsätter, om man inte pausar och kör igång igen.
    /*if(is_ipad()){
      video.pause();
      setTimeout(function(){
        video.play();
      }, 1000);
    }*/
  }
}

function pause_video(video) {
  video.pause();
}

function stop_video(video) {
  video.stop();
}

// Uppdaterar kursloggen
function set_user_log(auto_continue_to_next_page, auto_continue_play_video, course_finished, user_points_for_course) {
  uto_continue_to_next_page = typeof auto_continue_to_next_page !== 'undefined' ? auto_continue_to_next_page : false;
  auto_continue_play_video = typeof auto_continue_play_video !== 'undefined' ? auto_continue_play_video : false;
  course_finished = typeof course_finished !== 'undefined' ? course_finished : false;
  user_points_for_course = typeof user_points_for_course !== 'undefined' ? user_points_for_course : 0;

  ajax_loader(true);

  if (!$.isEmptyObject($("video")[0])) {
    $("video")[0].pause();
  }

  if (course_finished) {
    update_type = "update_and_set_as_finished";
  } else {
    update_type = "update";
  }

  //preview = false
  if (!preview) {
    var course_id = course_info.published_info.course_id_kursstart;
    var exam_id = course_info.published_info.course_id_kursstart;

    ajax_load("../../courses_shared/set_user_log.php?course_id=" + course_id + "&exam_id=" + exam_id, {
      type: update_type,
      user_log: user_log,
      total_course_time: total_course_time,
      user_points_for_course: user_points_for_course
    }, function (data) {

      ajax_loader(false);

      //console.log(data);
      if (auto_continue_to_next_page) {
        get_page(1);
      }
      if (auto_continue_play_video) {
        if (!$.isEmptyObject($("video")[0])) {
          hide_event_container($("#event_container"));
          if (is_ipad()) $("video").css({
            visibility: "visible"
          });
          play_video($("video")[0]);
        }
      }
    }, "json");
  } else {
    // Kollar om webbläsaren stödjer localStorage
    if (Modernizr.localstorage) {
      ajax_loader(false);

      localStorage["user_log_course_" + course_info.course_id] = JSON.stringify(user_log);

      if (auto_continue_to_next_page) {
        get_page(1);
      }
      if (auto_continue_play_video) {
        if (!$.isEmptyObject($("video")[0])) {
          hide_event_container($("#event_container"));
          if (is_ipad()) $("video").css({
            visibility: "visible"
          });
          play_video($("video")[0]);
        }
      }

      show_page_info();
    }
  }
  /*if(show_only_debug_buttons)
  {
    show_page_info();
  }*/
  //console.log(user_log);
}

// Koll så att man inte kan gå bakåt om man är på första sidan eller fortsätta om man är på sista sidan
// Skickar man in tomt så försöker den hämta från course_log. Skicka in "none" eller "tomt" eller nåt för att gömma alla knappar
function show_control_buttons(buttons_to_show) {
  buttons_to_show = typeof buttons_to_show !== 'undefined' ? buttons_to_show : "";

  // Börjar med att gömma alla knappar och kontrollpanelen
  var view_control_buttons = false;
  // OBS! GÅR EJ ATT FEJDE UT KNAPPARNA HÄR! <--- Blir nån slags bugg. Kanske att den inte hinner med att fejda ut.
  $("#control_buttons").hide();
  $("#control_buttons .button").hide();

  $("#control_buttons .button").removeClass("button_disabled");

  // Kollar om det är sidans inställningar för vilka knappar som ska synas som ska användas eller om det är det man skickar in i funktionen
  // Lägger vilka knappar som ska synas i en array
  var control_buttons_to_show = "";
  if (buttons_to_show != "") {
    control_buttons_to_show = buttons_to_show.split(",");
  } else {
    if (!$.isEmptyObject(course.pages[current_page_key].show_control_buttons)) {
      control_buttons_to_show = course.pages[current_page_key].show_control_buttons.split(",");
    }
  }

  if (control_buttons_to_show.length != 0) {
    // Kollar om knapparna ska synas först när en film är klar
    var control_buttons_to_show_when_movie_finished = false;
    if ($.inArray("movie_finished", control_buttons_to_show) != -1) {
      control_buttons_to_show_when_movie_finished = true;
    }

    $.each(control_buttons_to_show, function (control_button_key, control_button) {
      switch ($.trim(control_button)) {
        case "all":
          $("#control_buttons .button").fadeIn("fast");
          view_control_buttons = true;
          break;
        case "next":
          //console.log("Visa framåt");
          $("#next_button").fadeIn("fast");
          view_control_buttons = true;
          break;
        case "previous":
          //console.log("Visa bakåt");
          $("#prev_button").fadeIn("fast");
          view_control_buttons = true;
          break;
        case "course_menu":
          //console.log("Visa snabbmeny");
          $("#show_course_menu_button").fadeIn("fast");
          view_control_buttons = true;
          break;
        case "return":
          //console.log("Visa snabbmeny");
          $("#return_button").fadeIn("fast");
          view_control_buttons = true;
          break;
      }
    });

    if (view_control_buttons) {
      if (control_buttons_to_show_when_movie_finished) {
        $("video").bind("ended", function () {
          $("#control_buttons").fadeIn("fast");
          check_course_postition_for_buttons();

        });
      } else {
        $("#control_buttons").fadeIn("fast");
        check_course_postition_for_buttons();
      }
    }
  }

  // Kod för debugknapparna
  if (preview) {
    $("#debug_next_button").fadeOut("fast");
    $("#debug_prev_button").fadeOut("fast");
    $('#debug_select_page').fadeOut("fast");

    if (current_page_key == course.pages.length - 1) {
      $("#debug_next_button").fadeOut("fast");
    } else {
      $("#debug_next_button").fadeIn("fast");
    }
    if (current_page_key == 0) {
      $("#debug_prev_button").fadeOut("fast");
    } else {
      $("#debug_prev_button").fadeIn("fast");
    }

    $('#debug_select_page').fadeIn("fast");
  }
}

$(function () {
  // Kör en timer för att behålla referensen till parent-fönstret, ifall det laddas om.
  if (typeof preview !== 'undefined') {
    if (preview) {
      childTimer = window.setInterval(function () {
        try {
          if (window.opener != null) { // Kollar om den är öppnad från en parent, annars tas timern bort
            window.opener.preview_window = window;
          } else {
            window.clearInterval(childTimer);
          }
        } catch (e) {}
      }, 1000);

      window.onUnload = function () {
        try {
          window.clearInterval(childTimer);
          window.opener.preview_window = null;
        } catch (e) {}
      }
    }
  }
});

function check_course_postition_for_buttons() {
  // Loopar igenom alla kontrollknappar och tar bort alla förutom prev_button och next. För att rensa upp i bottombar om det skapats extraknappar för t.ex övningar och övningsgenomgångar
  $control_buttons = $('#control_buttons #control_buttons_left, #control_buttons #control_buttons_right').children();
  $.each($control_buttons, function (control_button_key, control_button) {
    switch ($(control_button).attr('id')) {
      case 'prev_button':
      case 'next_button':
      case 'show_course_menu_button':
        break;
      default:
        $(control_button).remove();
    }
  });

  // Om kursen inte är linjär så ska snabbvals-knappen också rensas bort. Den ska bara synas i linjära kurser
  if (course_info.course_linear == 0) {
    $('#control_buttons #control_buttons_left #show_course_menu_button').remove();
  }

  $('#control_buttons_left, #control_buttons_right').show();

  // Kollar om man är på första eller sista sidan för då ska inte bakåt respektive framåt-knappen inte synas
  if (current_page_key == course.pages.length - 1) {
    $("#next_button").fadeOut("fast");
  } else {
    //$("#next_button").fadeIn("fast");
  }
  if (current_page_key == 0) {
    $("#prev_button").fadeOut("fast");
  } else {
    //$("#prev_button").fadeIn("fast");
  }
}

/**
 * Hämtar numret på nuvarande sida och antalet sidor i kursen
 */
function get_course_pos() {
  var course_pos = new Object();

  course_pos.current = user_log.pages.length; //current_page_key + 1;
  course_pos.total = course.pages.length;
  course_pos.percent = Math.floor(100 * (course_pos.current) / course_pos.total)
  course_pos.latest_viewed_page = get_latest_viewed_page();
  course_pos.latest_viewed_page++;

  return course_pos;
}

/**
 * Uppdaterar info om var kursdeltagaren är i kursen
 */
function update_course_pos() {
  var course_pos = get_course_pos();

  $('#course-pos .current').html(course_pos.current);
  $('#course-pos .total').html(course_pos.total);
}

function get_latest_viewed_page() {
  var latest_pagekey = -1;
  var timestamps = new Object();
  var sorted_timestamps = new Object();

  //console.log(get_and_format_date("", 1).toLocaleString());
  // Loopar igenom användarloggen
  $.each(user_log.pages, function (key, value) {
    if (!!value) {
      //console.log(key + ': ' + value.name + ' : ' + value.date_viewed +  ' : ' + get_and_format_date(value.date_viewed,1) );
      // Check if the date is valid
      if (get_and_format_date(value.date_viewed,1) == -1) {
        // The date isn't valid, set it to todays date and current time
        timestamps[key] = get_and_format_date("", 3);
        user_log.pages[key].date_viewed = get_and_format_date("", 3);
      }

      timestamps[key] = get_and_format_date(value.date_viewed, 1).getTime();
    }
  });

  // Sorterar arrayen numeriskt och stigande, dvs högst värdet sist mao sidan där man var sist
  by_sorted_value(timestamps, function (key, value) {
    sorted_timestamps[key] = value;
    latest_pagekey = key;
  });

  return parseInt(latest_pagekey);
}

// Skriver ut information om sidan
function show_page_info() {
  var view_once = false;
  var view_in_menu = true;
  if (typeof course.pages[current_page_key].view_once != 'undefined') view_once = boolean_check_and_convert(course.pages[current_page_key].view_once);
  if (typeof course.pages[current_page_key].view_in_menu != 'undefined') view_in_menu = boolean_check_and_convert(course.pages[current_page_key].view_in_menu);

  // Tömmer debug-infon så att det inte ligger kvar gammal info där när man byter sida
  debug_page_info = $('#debug_page_info .debug_page_info_name').next('td');
  $.each(debug_page_info, function (key, value) {
    if (!$(value).has('textarea').length) {
      $(value).empty();
    } else {
      $(value).val('');
    }
  });

  debug_page_info = $("#debug_page_info table td")
  $.each(debug_page_info, function (key, value) {
    if (typeof $(value).attr('class') != 'undefined') {
      class_name = $(value).attr('class');
      switch (class_name) {
        case "done":
          // Förutsätter att sidan är klar
          var done = true;
          // Annar hämtar statusen från course_log
          if (course.pages[current_page_key][class_name] != undefined) {
            done = course.pages[current_page_key][class_name];
          }
          $(value).html(String(done));
          break;
        case "type":
          $(value).html(pagetypes[Number(course.pages[current_page_key][class_name])] + " (" + course.pages[current_page_key][class_name] + ")");
          break;
        case "view_once":
          $(value).html(view_once.toString());
          break;
        case "view_in_menu":
          $(value).html(view_in_menu.toString());
          break;
        case "description":
          $(debug_page_info).children("#description_text").val(course.pages[current_page_key][class_name]);
          break;
        case "todo":
          $(debug_page_info).children("#todo_text").val(course.pages[current_page_key][class_name]);
          break;
        case "user_log":
          $(debug_page_info).children("#user_log_text").val(JSON.stringify(user_log.pages[current_page_key], null, '\t'));
          break;
        case "position":
          $(value).html(JSON.stringify(course.pages[current_page_key][class_name]));
          break;
        default:
          $(value).html(course.pages[current_page_key][class_name]);
      }
    }
  });

}

// Hämtar eventuella undertexter
function get_subtitles(movie_url) {
  // Vilka språk som finns sätts i kursstrukturen, course.js.php
  /*var languages = [{
        "label": "Svensk undertext",
        "srclang": "sv"
      },{
        "label": "English subtitle",
        "srclang": "en"
      },{
        "label": "Norske undertekst",
        "srclang": "no"
      }];*/

  // Sätter standard filformat
  var subtitle_formats = ["vtt", "srt", "sbv", "lrc", "ttml"];
  var subtitle_file_extension = "." + subtitle_formats[0];

  // Hämtar defaultspråket
  var querystring = window.location.search;
  var querystring = deparam(querystring);

  // Hämtar ut filnamnet på filmen, exklusive sökvägen
  var str = movie_url;
  var regex = /([^/]+$)/i;
  var movie_url_filname = str.match(regex);

  if (movie_url_filname != null) {
    movie_url_filname = movie_url_filname[0];

    var subtitles = [];
    var index = 0;

    load_language(subtitles, index, languages, movie_url, subtitle_file_extension, language_settings.language, false);
  }
}

use_captionator = false;
// Kollar vilka undertexter som finns och lägger dom i en array. Lägger sedan till dom tiil video-elementet
function load_language(subtitles, index, languages, movie_url, subtitle_file_extension, language, found_subtitle) {
  if (index < languages.length) {
    $.get(movie_url + "." + languages[index].srclang + subtitle_file_extension)
      .done(function (data) {
        //console.log(data);

        subtitles.push("<track kind='subtitles' src='" + movie_url + "." + languages[index].srclang + subtitle_file_extension + "' srclang='" + languages[index].srclang + "' label='" + languages[index].label + "' " + (languages[index].srclang == language ? "default" : "") + " ></track>");

        index++;
        found_subtitle = true;
        load_language(subtitles, index, languages, movie_url, subtitle_file_extension, language, found_subtitle);
      })
      .fail(function (jqXHR, textStatus, errorThrown) {
        //console.log($(jqXHR.responseText).text());
        switch (jqXHR.status) {
          case 0:
            error_text = "Could not connect.\n Verify Network.";
            break;
          case 404:
            error_text = "Page not found [404].";
            break;
          case 500:
            error_text = "Internal Server Error [500].";
            break;
          default:
            error_text = "Unknown error. " + $(jqXHR.responseText).text();
        }
        //$("#course_page_content").html("<p>" + error_text + "</p>");
        //console.log(error_text);

        index++;
        load_language(subtitles, index, languages, movie_url, subtitle_file_extension, language, found_subtitle);
      });
  } else {
    if (found_subtitle) {
      var video_object = $("video")[0];
      $(video_object).append(subtitles.join(""));

      use_captionator = captionator.captionify();
    }
    set_language();
  }
}

// Växlar mellan undertexter
function switch_subtitles() {

  if (typeof $("video")[0] !== 'undefined') {

    // Hämtar undertexterna
    var texttracks = $("video")[0].textTracks;

    if (typeof texttracks == "object") {
      if (use_captionator) {
        // Firefox
        //OFF, HIDDEN eller SHOWING
        $.each(texttracks, function (texttrack_key, texttrack) {
          texttracks[texttrack_key].mode = captionator.TextTrack.OFF;

          if (texttracks[texttrack_key].language == language_settings.language && language_settings.subtitle == true) {
            texttracks[texttrack_key].mode = captionator.TextTrack.SHOWING;
          }
        });
      } else {
        // Safari, Chrome
        // hidden eller showing. disabled verkar inte funka
        $.each(texttracks, function (texttrack_key, texttrack) {
          texttracks[texttrack_key].mode = "hidden";

          if (texttracks[texttrack_key].language == language_settings.language && language_settings.subtitle == true) {
            texttracks[texttrack_key].mode = "showing";
          }
        });
      }
    }
  }
}

// Visar / gömmer undertexter
function toggle_subtitles(show) {
  language_settings.subtitle = show;
  $.cookie("language_settings", JSON.stringify(language_settings));
  switch_subtitles();
}

// Byter språk
function set_language() {
  if (typeof languages !== 'undefined') {
    if (languages instanceof Array) {
      if (languages.length != 0) {
        $("*[lang]").hide();
        $("*[lang='" + language_settings.language + "']").show();

        switch_subtitles();
      }
    }
  }
}

// Måste även gömma elemnten som skapats annars ligger dom i vägen t.ex när man byter sida.
function hide_captionator() {
  if (use_captionator) {
    $(".captionator-cue-canvas").remove();
    window.addEventListener("resize", function (eventData) {
      $(".captionator-cue-canvas").remove();
    });
  }
}

// Loopar igenom alla språk och skapar olika typer av knappar
function init_change_language_buttons(type) {
  var language_buttons = ["<ul id='change_language'>"];

  switch (type) {
    case "buttons":
      $.each(languages, function (lng_key, lng) {
        language_buttons.push("<li><span class='button green_gradient' data-language='" + lng.srclang + "'><img src='../shared_new/img/flag_24x16_" + lng.srclang + ".png' alt='" + lng.label + "' /> " + lng.label + " &rarr;</span></li>");
      });
      break;
    case "flags":
      $.each(languages, function (lng_key, lng) {
        language_buttons.push("<li><span data-language='" + lng.srclang + "'><img src='../shared_new/img/flag_24x16_" + lng.srclang + ".png' alt='" + lng.label + "' /></span></li>");
      });
      break;
  }

  language_buttons.push("</ul>");

  return language_buttons;
}

// Lägger in knapparna där man kan välja språk
function show_languages() {
  if (typeof languages !== 'undefined') {
    if (languages instanceof Array) {
      if (languages.length != 0) {
        language_buttons = init_change_language_buttons("flags");

        if ($("#course_tools #language_settings").length == 0) {
          $("#course_tools").append("<section id='language_settings'></section>")
        }

        $("#course_tools #language_settings").html(language_buttons.join(""));

        $("#course_tools #language_settings li span").click(function () {
          language_settings.language = $(this).data("language");
          $.cookie("language_settings", JSON.stringify(language_settings));
          set_language();
        });

        if (preview) {
          //$("#change_language").show()
        }

      }
    }
  }
}

// Hitta en sida med ett visst databas id. Används främst för förhandsgranskning från publiceringsverktyget
function find_page_with_page_id(page_id) {
  var found_page_key = 0;

  $.each(course.pages, function (page_key, page) {
    if (page.id == page_id) {
      found_page_key = page_key;
      return false;
    }
  });

  return found_page_key;
}

// Hämatr en sida från orginal kursstrukturen, den som inte är "tillplattad". Retunerar sidan med eventuella childpages
function get_page_by_position(position) { // Sträng '0,4' eller array [0,4]

  // Om ingen postion skickats in hämtas nuvarande sida
  if (arguments.length == 0) {
    position = course.pages[current_page_key].position;
  } else {
    // Kollar om det inte är en array och konverterar det i så fall och gör om till int
    if (!Array.isArray(position)) {
      position = position.split(',').map(Number);
    }
  }

  var str = "";
  for (var i = 0; i < position.length; i++) {
    if (i == 0) {
      str = "original_course.pages[" + position[i] + "]";
    } else {
      str += ".children[" + position[i] + "]";
    }
  }

  str += ";";
  return eval(str);
}

// Hämtar parent sidan
function get_parent_page(page_index_or_position) {

  // Om ingen index eller position skickats in hämtas nuvarande sida
  if (arguments.length == 0)
    page_index_or_position = current_page_key;

  // Hämtar positionen om det är index som skickats in
  var parent_page_position = "";
  if ($.isArray(page_index_or_position)) {
    // Klonar orginalobjektet så att inte det ändras. Funkar inte att klona med $.extend.
    parent_page_position = JSON.parse(JSON.stringify(page_index_or_position));
  } else {
    // Klonar orginalobjektet så att inte det ändras
    parent_page_position = $.extend(true, {}, course.pages[page_index_or_position].position);
    //Gör om det från ett object till array
    parent_page_position = $.map(parent_page_position, function (el) {
      return el
    });
  }

  // Tar bort sista elementet i arrayen
  parent_page_position.pop();

  if (parent_page_position != "") {
    parent_page = get_page_by_position(parent_page_position);
  } else {
    parent_page = "";
  }

  return parent_page;
}

/*********************************************************
Escape all needed characters for jQuery.

Because jQuery uses CSS syntax for selecting elements, some characters are interpreted as CSS notation. For example, ID attributes, after an initial letter (a-z or A-Z), may also use periods and colons, in addition to letters, numbers, hyphens, and underscores (see W3C Basic HTML Data Types). The colon (":") and period (".") are problematic within the context of a jQuery selector because they indicate a pseudo-class and class, respectively.

In order to tell jQuery to treat these characters literally rather than as CSS notation, they must be "escaped" by placing two backslashes in front of them.

https://learn.jquery.com/using-jquery-core/faq/how-do-i-select-an-element-by-an-id-that-has-characters-used-in-css-notation/
*/
function escape_for_jquery(str) {
  return str.replace(/(:|\.|\[|\]|,)/g, "\\$1");
}
/*********************************************************/

// Lägger till/ändrar querystringen till rätt ID för sidan
function add_page_querystring() {
  url = parse_and_get_url(window.location);

  // Standard värden
  query_keys = new Object();
  query_keys.course_id = url.query.course_id;
  query_keys.page_id = course.pages[current_page_key].id;

  query_keys.lng = url.query.lng;
  if (url.query.preview != undefined) {
    query_keys.preview = url.query.preview;
  }
  if (url.query.demo_token != undefined) {
    query_keys.demo_token = url.query.demo_token;
  }
  if (url.query.responsive_preview != undefined) {
    query_keys.responsive_preview = url.query.responsive_preview;
  }
  if (url.query.hash != undefined) {
    query_keys.hash = url.query.hash
    if(query_keys.hash.slice(-1) != '='){ // Add "=" (if missing) at the end of encrypted hash since it gets removed when parsing the url
      query_keys.hash += '=';
    }
  }

  // Om sidan övning eller övningsgenomgång så utökas querystringen med ytterligare id för att hålla koll på vilken sidan man är på och ibland att man bara ska kunna se ett visst span av sidor i övningsgenomgånar. I annat fall sätt querystringen till defaultvärden.
  switch (course.pages[current_page_key].type) {
    case 13: // Övning
      if (url.query.debug != undefined) {
        query_keys.debug = url.query.debug;
      }
      break;
    case 15: // Övningsgenomgång
      query_keys.question_page_key = url.query.question_page_key;

      query_keys.review_page_key = url.query.review_page_key;
      if (url.query.review_pages_span != undefined) {
        query_keys.review_pages_span = url.query.review_pages_span;
      }
      break;
  }

  url.query = query_keys;

  new_url = url.scheme + '://' + url.host + url.path + (!$.isEmptyObject(url.query) ? '?' + $.param(url.query) : "") + (!$.isEmptyObject(url.hash) ? '#' + $.param(url.hash) : "");

  window.history.replaceState({}, document.title, new_url);
}

events = "";
current_event_key = "";

function get_page(offset) {
  var animate_page_change_speed = "medium";

  // Kollar om sidan finns eller om någonting blivit galet, sätter i så fall så att man hamnar på första sidan.
  if (course.pages[current_page_key] == undefined) {
    current_page_key = 0;
  }
  if (course.pages[current_page_key].type == 14) {
    // Minskar ner när det är övningsexempel-sidor för att man ska se skillnaderna mellan sidorna bättre.
    animate_page_change_speed = 'none';
  }

  show_hide_page_contents(animate_page_change_speed, 'opacity', 'hide', function(){
    hide_captionator();

    // Rensar och sätter variabler
    events = "";
    current_event_key = "";
    var current_time = 0;

    // När man klickat i menyn så sätts variabler tillbaka för att kolleb om man är på samlingssidan för alla övningar och kunskapstester.
    if ($('#course_menu_pages').multilevelpushmenu) {
      if (multilevelpushmenu_clicked) {
        multilevelpushmenu_dont_change = false;
        got_here_from_exercises_or_knowledge_tests = false;

        // Nollställer querystringen från question_page_key så att man inte kan hamna mitt i en sida i en övning, t.ex övningsprovet
        url = parse_and_get_url(window.location);
        if (url.query.question_page_key != undefined) {
          url.query.question_page_key = 0;
          new_url = url.scheme + '://' + url.host + url.path + (!$.isEmptyObject(url.query) ? '?' + $.param(url.query) : "") + (!$.isEmptyObject(url.hash) ? '#' + $.param(url.hash) : "");
          window.history.replaceState({}, document.title, new_url);
        }
      }
    }

    // Rensar eventuella test-timers för säkerhets skull.
    for (var i = test_timers.length; i--;) {
      clearInterval(test_timers[i]);
      test_timers.splice(i, 1);
    }

    // Om sidan är "välj övning" så hoppa till nästa sida/kapitel, istället för nästa undersida. Mao det ska inte gå att stega in i övningsexempel/övning med framåtknappen
    /*
        Sidtyper:
        12: Välj övning
        13: Övning
        14: Övningsexempel
        15: Övningsgenomgång
        16: Övningar och Kunskapstester
    */
    if (course.pages[current_page_key].type == 12 && offset == 1) {
      var page_position = JSON.parse(JSON.stringify(course.pages[current_page_key].position)); // Klonar page_position så att man inte ändrar i orginalet
      var last_page_pos = page_position[page_position.length - 1];
      last_page_pos += 1;
      page_position[page_position.length - 1] = last_page_pos;
      var page = get_page_by_position(page_position);
      current_page_key = page.page_index;
      offset = 0;
    }

    //Om sidan är en övning, övningsgenomgång eller övningsexempel och man har backat dit från en annan sida så ska man hamna på "Välj övning"-sidan
    var exercise_page_types = [13, 14, 15];
    if ($.inArray(course.pages[current_page_key].type, exercise_page_types) == -1 && offset == -1) {
      // Kollar om sidan man kommer till är en övning, övningsgenomgång eller övningsexempel för i så fall ska man hamna på "Välj övning"-sidan
      if ($.inArray(course.pages[current_page_key + offset].type, exercise_page_types) !== -1) {
        var page_position = JSON.parse(JSON.stringify(course.pages[current_page_key].position)); // Klonar page_position så att man inte ändrar i orginalet
        var last_page_pos = page_position[page_position.length - 1];
        last_page_pos -= 1;
        page_position[page_position.length - 1] = last_page_pos;
        var page = get_page_by_position(page_position);
        current_page_key = page.page_index;
        offset = 0;
      }
    }

    // Aktuellt sid-ID
    current_page_key = current_page_key + offset;

    if (current_page_key > course.pages.length - 1) {
      current_page_key = 0;
    }

    if (preview) {
      //$('#debug_select_page').val(current_page_key);
      debug_show_page_list();
    }

    add_page_querystring();

    // Om kursen inte är linjär så sparar inte kunskapstester; quiz, sant eller falskt och jeopardy
    if (!course_info.course_linear) {
      var dont_save_page_types = [3, 7, 9];
      if ($.inArray(course.pages[current_page_key].type, dont_save_page_types) > -1) {
        // Tar bort eventuella svar på sidan
        if (!$.isEmptyObject(user_log.pages[current_page_key])) {
          if (!$.isEmptyObject(user_log.pages[current_page_key].answers)) {
            delete user_log.pages[current_page_key].answers;
            delete user_log.pages[current_page_key].points;
          }
        }
      }
    }

    // Tar bort allting som eventuellt lagts till utöver sidinnheållet, t.ex explanation_container för övningsexempel
    // Bara #course_guide, course_page_content ska finnas under #course_content
    $content_to_remove = $('#course_content').children().not('#course_guide, #page_name, #course_page_content, #video_controllers, .bottom_bar_dummy, #bottom_bar');
    $content_to_remove.remove();

    // Containern
    var course_page_content = $("#course_page_content");

    // Kollar om sidan är visad förut och om den bara ska visas en gång
    view_once = false;
    if (typeof course.pages[current_page_key].view_once != 'undefined') view_once = boolean_check_and_convert(course.pages[current_page_key].view_once);

    if (!$.isEmptyObject(user_log.pages[current_page_key]) && boolean_check_and_convert(view_once)) {
      get_page(1);
    } else {
      // Sidans innehåll
      var content = course.pages[current_page_key].content;

      // Sidas rubrik
      // Finns även kategori, vet inte om det behövs
      // course.pages[current_page_key].category

      var theme_page_name = $('#course_content > #page_name');
      var page_name_and_content = content;

      if (!theme_page_name.length) {
        page_name_and_content = "<div id=\"page_name\"><h2>" + course.pages[current_page_key].name + "</h2></div>" + page_name_and_content;
      } else {
        $('#course_content > #page_name h2').html(course.pages[current_page_key].name);
      }

      content = '<section id="page_contents" class="group content-wrapper">' + page_name_and_content + '</section>'

      // Sätter standardvärden för videoprogress och gömmer den tills videon kommer igång
      var video_progress_percent = 0;
      $("#video_progress").width(video_progress_percent + "%");
      /*$("#video_controllers").fadeOut("fast");
      // Bugg i WebKit, controllerna fejdas inte bort*/
      $("#video_controllers").hide();

      show_control_buttons();

      if ($('#course_menu_pages').multilevelpushmenu) {
        if (multilevelpushmenu_clicked) {
          set_active_menu_page(offset);
        }
      }

      // Kollar om det finns css som ska laddas
      load_css_for_page(course.pages[current_page_key].css_url, function(){
        ajax_loader(true);
        // Eventuell CSS laddad

        remove_unused_css_for_page(course.pages[current_page_key].css_url);

        insert_page_contents(course_page_content, content, function(){
          //$('#course_content #page_name h2').html('Lägger in innehållet')
          // Lägger in innehållet

          set_readmore_button();

          // Sätter poster-bild
          set_video_poster_image(course_page_content);

          // Lägger till undertext
          set_video_subtitle(course_page_content);

          // Lägger till attributet target="_blank" på alla länkar i elementen .text.
          $('#page_contents .text a').attr('target', '_blank');

           //load_js_for_page2(course.pages[current_page_key].js_url);
           load_js_for_page_via_getscript(course.pages[current_page_key].js_url).done(function() {
            // All eventuella script laddade

            show_hide_page_contents(animate_page_change_speed, 'opacity', 'show', function(){
              // Visar innehållet
              ajax_loader(false);

              if ($('#course_menu_pages').multilevelpushmenu) {
                if (multilevelpushmenu_dont_change == false) {
                  if (!multilevelpushmenu_clicked) {
                    set_active_menu_page(offset);
                  } else {
                    multilevelpushmenu_clicked = false;
                  }
                }
              };
            });

          }).fail(function(error) {
            // one or more scripts failed to load
            //console.log('one or more scripts failed to load');
          }).always(function() {
            // always called, both on success and error
            //console.log('always called, both on success and error');
          });

        });
      });

      //countup_start();

      //create_breadcrumbs_trail();

      //show_control_buttons();

      show_languages();

      // Uppdaterar info om sidposition
      //update_course_pos();

      // Uppdaterar guiden sida x av y
      $("#course_guide_text").fadeOut("fast", function () {

        var dont_show_on_page_types = [12, 13, 15];
        if ($.inArray(course.pages[current_page_key].type, dont_show_on_page_types) == -1) {
          page_nr = course.pages[current_page_key].position[course.pages[current_page_key].position.length - 1] + 1;
          page_nr_of = original_course.pages.length;

          // Kollar sidan är ett kapitel och börjar i så fall räkna från 1
          //if( course.pages[current_page_key].children_nr_of !== undefined ) {
          if (current_page_is_chapter()) {
            page_nr = 1;
            page_nr_of = course.pages[current_page_key].children_nr_of + 1;
          }

          // Kollar om man är inuti ett kapitel
          //if( course.pages[current_page_key].position.length > 1 && course.pages[current_page_key].children_nr_of == undefined ) {
          if (course.pages[current_page_key].position.length > 1 && !current_page_is_chapter()) {
            page_nr++; // Plussar på ett eftersom huvudsidan i kapitlet är nr 1
            page_nr_of = get_parent_page(current_page_key).children_nr_of + 1; // Hämtar huvudsidan i kapitle och kollar hur många sidor det innehåller
          }

          // Kollar om det är en ensam övningsexempel mall utan några undersidor och fixar till sidnumreringen
          if(course.pages[current_page_key].type == 14 && !current_page_is_chapter()){
            parent_page = get_parent_page(current_page_key);
            if(parent_page.type != 14){
              page_nr = 1;
              page_nr_of = 1;
              $("#prev_button").fadeOut("fast");
              $("#next_button").fadeOut("fast");
            }
          }

          /*
            Byter ut och formaterar strängen beroende på hur det ska visas upp. Utseendet och vad som ska skrivas ut ställs in i respektive tema.

            %1$s : Sida
            %2$s : x
            %3$s : av
            %4$s : y

            %1$s %2$s %3$s %4$s = Sida x av y
            %2$s / %4$s = x / y

            show_in_root: true // Visas även i huvudnivån/rootnivån i kursen och inte bara inuti kapitel
            show_with_content: true // Flyttar in sidvisningen inuti kursinehållet
          */

          var page_nr_settings = $.parseJSON($('#course_guide_text').attr('data-settings'));
          $("#course_guide_text").html(sprintf(page_nr_settings.formatting, i18next.t("theme.text.page"), page_nr, i18next.t("theme.text.of"), page_nr_of));

          // Flyttar in course_guide in tillsammans med innehållet
          if (page_nr_settings.show_with_content) {
            // Kollar om den redan är flyttad
            if ($('#course_content > #course_guide').length == 0) {
              var $course_guide = $("#course_tools #course_guide");
              var $course_guide = $course_guide.detach().prependTo('#course_content');
            }
          }

          // Visar inte antalet sidor om man är i huvudnivån
          if (page_nr_settings.show_in_root == true) {
            $('#course_guide_text').fadeIn("fast");
            //}else if( page_nr_settings.show_in_root == false && course.pages[current_page_key].position.length > 1 || course.pages[current_page_key].children_nr_of !== undefined ) {
          } else if (page_nr_settings.show_in_root == false && course.pages[current_page_key].position.length > 1 || current_page_is_chapter()) {
            $('#course_guide_text').fadeIn("fast");
          }
        }
      });

      // Uppdaterar progressbaren
      var progress_percent = Math.floor(100 * (current_page_key + 1) / course.pages.length);
      $("#progress").width(progress_percent + "%");

      // Om kursen är linjär så ska snabbvals-menyn uppdateras varje gång man byter sida.
      if (typeof set_course_menu_pages === "function") { // Kollar så att funktionen finns för säkerhets skull
        if (course_info.course_linear == 1) {
          set_course_menu_pages();
        }
      }

      // Kollar om sidan redan finns i användarloggen och uppdaterar isf den
      if (!$.isEmptyObject(user_log.pages[current_page_key]) && user_log.pages[current_page_key] != "") {
        //console.log("Uppdaterar tidigare besökt sida");
        user_log.pages[current_page_key].name = course.pages[current_page_key].name;
        user_log.pages[current_page_key].viewed = true;
        user_log.pages[current_page_key].date_viewed = get_and_format_date("", 3);
        user_log.pages[current_page_key].time_visited = (user_log.pages[current_page_key].time_visited == undefined ? 1 : user_log.pages[current_page_key].time_visited += 1);
      } else { // Annars lägger till sidan i användarloggen
        //console.log("Lägger till ny ej tidigare besökt sida");
        if(user_log.pages == ""){
          user_log.pages = [];
        }
        new_page = {
          "name": course.pages[current_page_key].name,
          "viewed": true,
          "date_viewed": get_and_format_date("", 3),
          "time_visited": 1
        };
        user_log.pages[current_page_key] = new_page;
      }
      //console.log( JSON.stringify(user_log.pages[current_page_key], null, 2));

      // Sparar hur länge man var inne på föregående sida och totaltiden
      //user_log.pages[current_page_key-offset].time_visited = $('#countup_seconds').countdown('getTimes')[6];
      //total_course_time = $('#countup_total_seconds').countdown('getTimes')[6];

      // Sparar användarloggen
      set_user_log(false, true, false);
    }
  });
}

/// Lägger in innehållet
function insert_page_contents(course_page_content, content, callback){
  switch (course.pages[current_page_key].type) {
    case 1: // text/html
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    case 10: // text/html fullskärm, täcker hela ytan
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    case 2: // video
      /*$("#course_page_content").html(content);
      set_language();
      break;*/
    case 11: // video med kontrollfrågor
    case 6: // film med frågor och respons
      // All denna kod för video borde läggas i en funktion så att man kan ladda filmer med event dynamiskt, tex olika filmer beroende på om man är godkänd eller inte. Se sortabel.js och true_false_result.js

      // Skapar eventkontainern för video
      content += "<section id=\"event_container\"></section>";

      //course.pages[current_page_key].movie_url = "inledning_jonas_lundin";

      //autoplay=\"autoplay\" controls=\"controls\"
      // Skapar videokontainer // Hmm vilken codecs ska man använda för mp4? Verkar som man ska använda avc1.42E01E, mp4a.40.2 istället för H.264, AAC,
      // Firefox och Chrome kör .webm
      // Safari och IE kör .mp4
      // För att undvika buffring
      rnd = "?rnd=" + Math.floor(Math.random() * 10000);
      content += "<video width=\"960\" height=\"540\" controls controlsList=\"nodownload\" >\
        <source src=\"" + course.pages[current_page_key].movie_url.toLowerCase() + ".mp4" + rnd + "\" type='video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\"' />\
        <source src=\"" + course.pages[current_page_key].movie_url.toLowerCase() + ".webm" + rnd + "\" type='video/webm; codecs=\"vp8, vorbis\"' />\
      </video>";
      //<source src=\"" + course.pages[current_page_key].movie_url + ".theora.ogv" + rnd + "\" type='video/ogg; codecs=\"theora, vorbis\"' />\

      // Lägger till sidinnehållet i containern
      course_page_content.html(content);

      if (typeof languages !== 'undefined') {
        if (languages instanceof Array) {
          if (languages.length != 0) {
            // Hämtar eventuella undertexter
            get_subtitles(course.pages[current_page_key].movie_url);

            $("video").bind("ended", function () {
              hide_captionator();
            });
          }
        }
      }

      // Visar controllern på iPad eftersom det inte går att autostarta video
      // Visar även controllern på alla filmer förutom filmer med frågor och respons
      if (is_ipad() || preview || course.pages[current_page_key].type == 2) {
        toggleControls($("video")[0]);
      }

      $("#video_controllers").fadeIn("fast");

      // Kollar om det finns några events
      if (!$.isEmptyObject(course.pages[current_page_key].events)) {
        // Hämtar events för video
        events = course.pages[current_page_key].events;
      }

      $("#course_page_content video").bind("timeupdate", function () {
        // Tiden som spelats
        // I hela sekunder
        current_time = parseInt(this.currentTime);
        total_time = parseInt(this.duration);

        //console.log(current_time + " / " + total_time);

        // Uppdaterar video progressbaren
        video_progress_percent = Math.floor(100 * (current_time) / total_time);
        $("#video_progress").width(video_progress_percent + "%");

        // Kollar om det finns några events
        if (!$.isEmptyObject(course.pages[current_page_key].events)) {
          // Rensar alla triggade event förutom de som bara får visas en gång vid start/omstart av en film
          if (current_time == 0) {
            $.each(events, function (key, value) {
              if (value.repeatable) {
                value.triggered = false;
              }
            });
          }

          // Föregående tid (används för att "throttla" antalet anrop till eventfunktionen)
          old_time = 0;

          // Hämtar nästa event från eventlistan (movie_properties)
          if (current_time > old_time) get_next_movie_event(events, current_time, $(this), $("#event_container"));

          old_time = current_time;
        }

      });

      // Kollar om filmen ska kunna spelas upp igen direkt när den slutat
      movie_buttons_container = ($("#course_page_content #movie_buttons_container"));
      if (movie_buttons_container.length > 0) {
        $("video").bind("ended", function () {
          if (is_ipad()) $("video").css({
            visibility: "hidden"
          });
          $("#movie_buttons_container").fadeIn("fast");
        });

        $("#watch_movie_again_button").off('click').click(function () {
          $("#movie_buttons_container").fadeOut("fast");
          if (is_ipad()) $("video").css({
            visibility: "visible"
          });
          play_video($("video")[0]);
        });
      }

      break;
    case 3: // sant eller falskt
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    case 4: // rangordna
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    case 5: // utvärdering
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    case 7: // Quiz checkbox, radio fritext
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    case 8: // Dra och släpp Quiz
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    case 9: // Jeopardy
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
    default:
      // Lägger till sidinnehållet i containern
      course_page_content.html(content);
      set_language();
      break;
  }

  var $has_attached_files = $(course_page_content).find('#attached_files');
  if ($has_attached_files.length != 0) {

    if( $(course_page_content).find('.gen_sound_index').length != 0 ) {
      $($has_attached_files).insertBefore( $(course_page_content).find('.gen_sound_index') );
    }

    load_css_for_page('../../js/plugins/fine-uploader-all-5.16.2/fine-uploader-mmc-course.css', function(){
      var attached_files = $.parseJSON( $has_attached_files.attr('data-attached_files') );
      var header = attached_files.length > 1 ? i18next.t('files:text.attached_files') : i18next.t('files:text.attached_file');
      var html = ['<h3>' + header + '</h3><ul>'];
      $.each(attached_files, function(key, file) {
        var url = 'https://' + file.s3Bucket + '.s3.eu-central-1.amazonaws.com/' + file.s3Key
        html.push('<li>');
        html.push('<a href="' + url + '" target="_blank">');
        html.push('<span class="file_icon">' + attached_file_icon(file.contentType) + '</span>' );
        html.push('<span class="file_name">' + file.name + '</span>');
        html.push('</a>');
        html.push('</li>')
      });
      html.push('</ul>');
      $has_attached_files.html( html.join('') );

      setTimeout(function() {
        $has_attached_files.addClass('show');

        $has_attached_files.off("click").click(function () {
          $has_attached_files.focus();
        });

      }, 2000);

      //$("#course_content #attached_files").draggable({handle: "#course_content #attached_files h3", containment: '#course_wrapper'});
      //$('#page_contents').css('padding');

    });


  }

  callback();
}

function attached_file_icon(contentType){
  var icon = "";
  var icon_fallback = "";
  switch (contentType) {
    case 'image/jpeg':
      icon = '../../js/plugins/fine-uploader-all-5.16.2/placeholders/if_jpgs_774688.svg';
      icon_fallback = '../../js/plugins/fine-uploader-all-5.16.2/placeholders/if_jpgs_774688.png';
      break;
    case 'image/png':
      icon = '../../js/plugins/fine-uploader-all-5.16.2/placeholders/if_pngs_774683.svg';
      icon_fallback = '../../js/plugins/fine-uploader-all-5.16.2/placeholders/if_pngs_774683.png';
      break;
    case 'application/pdf':
      icon = '../../js/plugins/fine-uploader-all-5.16.2/placeholders/if_pdfs_774684.svg';
      icon_fallback = '../../js/plugins/fine-uploader-all-5.16.2/placeholders/if_pdfs_774684.png';
      break;
  }
  return '<picture>\
            <source type="image/svg+xml" srcset="' + icon + '">\
            <img src="' + icon_fallback + '" alt="">\
          </picture>';
}

// Visar eller döljer innehållet
function show_hide_page_contents(animate_page_change_speed, type, state, callback) {
  switch (type) {
    case 'opacity':
      if($('#page_transition').length == 0) {
        $('<style id="page_transition">\
            #course_page_content.fade-transition-medium {\
              -webkit-transition: all 0.5s ease-in-out;\
              -moz-transition: all 0.5s ease-in-out;\
              -ms-transition: all 0.5s ease-in-out;\
              -o-transition: all 0.5s ease-in-out;\
              transition: all 0.5s ease-in-out;\
            }\
            #course_page_content.fade-transition-fast {\
              -webkit-transition: all 0.1s ease-in-out;\
              -moz-transition: all 0.1s ease-in-out;\
              -ms-transition: all 0.1s ease-in-out;\
              -o-transition: all 0.1s ease-in-out;\
              transition: all 0.1s ease-in-out;\
            }\
            #course_page_content.do-fade {\
              -webkit-opacity: 0;\
              -moz-opacity: 0;\
              opacity: 0;\
            }\
        </style>').appendTo('head');
      }

      $("#course_page_content").removeClass('fade-transition-fast fade-transition-medium');
      switch (animate_page_change_speed) {
        case 'medium':
          $("#course_page_content").addClass('fade-transition-medium');
          break;
        case 'fast':
          $("#course_page_content").addClass('fade-transition-fast');
          break;
        case 'none':
          break;
        default:
          $("#course_page_content").addClass('fade-transition-medium');
          break;
      }

      if (state === 'show' && animate_page_change_speed !== 'none' ) {
        // fejd in
        $("#course_page_content").removeClass('do-fade').one('transitionend', function () {
          callback();
          scroll_to_top_of_page();
        });
      } else if (animate_page_change_speed === 'none') {
        callback();
      } else {
        // fejd ut
        $("#course_page_content").addClass('do-fade').one('transitionend', function () {
          callback();
        });
      }
      break;
  }
}

function scroll_to_top_of_page(){
  // Scrollar högst upp på sidan
  $('html,body').animate({
    scrollTop: 0
  }, 800);
}

// Kollar om en fil finns och kör i så fall callback med jqXHR och datatyp
// does_file_exist("http://www.xpectum.se/kurser/vid/FAR/intervjuer_intern_extern_redovisning.vtt");
// does_file_exist("http://www.xpectum.se/kurser/vid/bokforing1/4_typer_av_konton.vtt");
// does_file_exist('../../../kurser/vid/bokforing1/4_typer_av_konton2.vtt', function (jqXHR, dataTypes) {
//   if (dataTypes[0] === "text" && dataTypes[1] !== "html") {
//     console.log( 'Funkar!' );
//   }
// })
// does_file_exist("../../../images/xpectum_logotype.png");
function does_file_exist(url_to_file, callback) {
  $.ajax({
      url: url_to_file
    })
  .done(function (jqXHR, textStatus) {
    //console.log("scriptet '" + js_url + "' har laddats")
    //console.log( $(this)[0].dataTypes );
    if (callback) {
      callback(jqXHR, $(this)[0].dataTypes);
    } else {
      return true;
    }
  })
  .fail(function (jqXHR, textStatus, errorThrown) {
    return false;
  });
}

/*
  Kollar och konverterar, om det behövs, strängar till riktiga boolean-värden
  Exempel:
    console.log( boolean_check_and_convert('false') );  // False
    console.log( boolean_check_and_convert(false) );    // False
    console.log( boolean_check_and_convert('true') );   // True
    console.log( boolean_check_and_convert(true) );     // True
    console.log( boolean_check_and_convert('abc') );    // False
    console.log( boolean_check_and_convert(123) );      // False
*/
function boolean_check_and_convert(bool_string) {
  switch (typeof bool_string) {
    case 'string':
      switch (bool_string.toLowerCase().trim()) {
        case "true":
        case "yes":
        case "1":
          return true;
        case "false":
        case "no":
        case "0":
        case null:
          return false;
        default:
          return false;
      }
      break;
    case 'boolean':
      return bool_string;
      break;
    default:
      return false;
  }
}

// Hämtar alla videoelement och sätter en poster bild utifrån samma filnamn som filmen
function set_video_poster_image($element) {
  var $video_elements = $element.find('video');
  if ($video_elements.length > 0) {
    $.each($video_elements, function (video_key, $video_element) {
      var poster_img = get_extension($($video_element).find('source').attr("src"));
      $($video_element).attr("poster", poster_img.name + ".jpg");
    });
  }
}

// Hämtar alla videoelement och sätter en subtitle utifrån samma filnamn som filmen
function set_video_subtitle($element) {

  user_video_subtitle_settings = { 
    show: false,
    language: ''
  };

  /* 
    Saves it in localStorage for all courses
    Change to this localStorage_key, if it is to be saved per course:
    'user_video_subtitle_settings_course_' + course_info.course_id]
  */
  var localStorage_key = 'user_video_subtitle_settings_course';
  if (Modernizr.localstorage) {
    if( localStorage[localStorage_key] != undefined ){
      user_video_subtitle_settings = JSON.parse(localStorage[localStorage_key]);
    }
  }

  // Alla språk. Om undertext-filen inte har någon suffix (_sv, _en, _no) så utgår vi från att det är en svensk undertext
  var languages = {
                    ""   : "Svenska",
                    "sv" : "Svenska",
                    "no" : "Norsk",
                    "en" : "English"
                  };

  var $video_elements = $element.find('video');
  if ($video_elements.length > 0) {
    // Loops through all videos
    $.each($video_elements, function (video_key, $video_element) {
      var subtitle = get_extension($($video_element).find('source').attr("src"));
      
      var subtitle_files = [];
      // Loops through all available languages and collect info
      $.each(languages, function (language_key, language_name) {
        var language_suffix = '';
        var language = 'sv';
        if(language_key !== ''){
          var language_suffix = '_' + language_key;
          var language = language_key;
        }
        var subtitle_file = subtitle.name + language_suffix + '.vtt';
        subtitle_files.push({"src": subtitle_file.toLowerCase(), "language_name": language_name, "language": language});
      });

      // Check for subtitle files and adds them as tracks
      get_subtitle_tracks(subtitle_files, $video_element, function () {
      });

      // Check for user changes of subtitle and which language is choosen. To be saved in localStorage
      $($video_element)[0].textTracks.onchange = function(event) {
        user_video_subtitle_settings.show = false;
        user_video_subtitle_settings.language = '';
        $.each(this, function (texttrack_key, texttrack) {
          if(texttrack.mode == 'showing'){
            user_video_subtitle_settings.show = true
            user_video_subtitle_settings.language = texttrack.language
          }
        })

        // TODO: change language/subtitle settings for all videos on page (video carousels)
        // Cant do it here because it triggers onchange again on all videos and it becomes an infinite loop (?)

        // Save the subtitle settings (is subitle showing and in what langugae) for current course in localStorage.
        // TODO: save settings in database, so it works everywhere ?
        if (Modernizr.localstorage) {
          localStorage[localStorage_key] = JSON.stringify(user_video_subtitle_settings);
        }
      };

    });
  }

}

// Check for subtitle files and adds them as tracks
function get_subtitle_tracks(subtitle_files, $video_element, callback) {
  var progress = 0;
  $.each(subtitle_files, function (subtitle_file_key, subtitle_file) {
    $.ajax({
      url: subtitle_file.src
    })
    .done(function (jqXHR, textStatus) {
      default_language = '';
      // If localStorage setting exist set chosen language
      if(user_video_subtitle_settings.language == subtitle_file.language){
        default_language = ' default';
      } 
      $($video_element).append('<track label="' + subtitle_file.language_name + '" kind="subtitles" srclang="' + subtitle_file.language + '" src="' + subtitle_file.src + '"' + default_language + '>');

      if (++progress == subtitle_files.length) callback();
    })
    .fail(function (jqXHR, textStatus, errorThrown) {
      if (++progress == subtitle_files.length) callback();
    });
  });
}

// Ändrar class på nuvarande sida i menyn så att man ser att den är aktiv.
function set_active_menu_page(offset) {
  // Kollar om multilevelpushmenu finns
  //if ($('#course_menu_pages').multilevelpushmenu) {
    /*
    Position:
    [0] -> Nuvarande sida eller "kapitel". Dvs första sidan, eller första sidan i första kapitlet i kursen

    [0][1] -> Andra sidan i första kapitlet:
    [0] -> Kapitel
    [1] -> Nuvarande sida

    [0][1][2] -> Tredje sidan i andra underkapitlet i första kapitlet:
    [0] -> Kapitel
    [1] -> Kapitel
    [2] -> Nuvarande sida
    */

    /*
    console.clear();
    console.log('position: ' + course.pages[current_page_key].position + ' : previous_position: ' + multilevelpushmenu_previous_position );
    console.log("children_nr_of: " + course.pages[current_page_key].children_nr_of);
    console.log(course.pages[current_page_key].position.length + ' > ' + multilevelpushmenu_previous_position.length);
    console.log("Är kapitel: " + current_page_is_chapter() );
    console.log("Klickat i menyn: " + multilevelpushmenu_clicked );
    */

    var $parent_menu, parent_id, active_menu;
    var page_position, nr_of_submenus;

    var $active_menu = $(escape_for_jquery("#menu" + JSON.stringify(course.pages[current_page_key].position)));

    var current_page = get_page_by_position($active_menu.attr('data-position'))
    var dont_change_to_submenu = false;

    // Kollar om sidan är av en viss typ där man menyn inte ska ändra sig och förhindrar att menyn går in i det kapitlet
    switch (current_page.type) {
      case 12: // Välj övning
      case 13: // Övning
      case 14: // Övningsexempel
      case 15: // Övningsgenomgång
        //case 16: // Övningar och Kunskapstester
        dont_change_to_submenu = true;

        // Leta upp närmaste "välj övning"-sida och markerar den i menyn.
        $page = get_closest_page_of_type(12);
        $page = $page.closest('div.levelHolderClass');

        /*
          if( current_page.type == 12 ) { // Om sidan man är på redan är "välj övning"-sidan, välj bara den
            $page = $active_menu.closest('div.levelHolderClass');
          } else { // Annars så leta upp närmaste "välj övning"-sida och markera den i menyn.
            page_position = JSON.parse(JSON.stringify(course.pages[current_page_key].position));
            nr_of_submenus = page_position.length-2;
            for (i = 0; i <= nr_of_submenus; i++) {
              page_position.pop();
              page = get_page_by_position( page_position );
              //console.log('page.type: ' + page.type);
              if( page.type == 12 ) {
                break;
              }
            }
            $page = $(escape_for_jquery( '#course_menu_pages #menu[' + page.position + ']')).closest('div.levelHolderClass');
          }
        */

        break;
    }

    if (!multilevelpushmenu_clicked) { // Koll om man gått till en sidan på något annat sätt än genom att klicka i menyn. Ändrar i så fall till rätt kapitel.
      if (current_page_is_chapter()) { // Om sidan man är på har undersidor, dvs är ett kapitel, så gå in i det kapitlet.
        $parent_menu = $(escape_for_jquery('#course_menu_pages #header[' + course.pages[current_page_key].position + ']')).parent("div");
      } else { // Annars kolla vilket som är "parent"-kapitel och gå in i det
        $parent_id = $(escape_for_jquery('#course_menu_pages #menu[' + course.pages[current_page_key].position + ']')).parent("ul").attr('data-parent-id');
        $parent_menu = $(escape_for_jquery('#course_menu_pages #' + $parent_id)).parent("div.levelHolderClass");
      }
      if (dont_change_to_submenu) {
        //if( !$('#course_menu_pages').multilevelpushmenu('menuexpanded', $page) ) {
          $('#course_menu_pages').multilevelpushmenu('expand', $page); // collapse
        //}
      } else {
        //if( !$('#course_menu_pages').multilevelpushmenu('menuexpanded', $parent_menu) ) {
          $('#course_menu_pages').multilevelpushmenu('expand', $parent_menu);
        //}
      }
    }

    // Sätter menyn så att den är lika hög som containern
    //$parent_ul.css('height',$('.course_mid_section').outerHeight()-5);
    //console.log($parent_ul.css('height'));

    //console.log("active_pos: " + $active_menu.position().top);
    //console.log("ul_height: " + $parent_ul.height());

    // Kollar om man klickar på en sida och markerar sidan direkt eller
    // om man bläddrar sig framåt/bakåt och ser isf till att sidan i menyn scrollas fram så att den syns
    if (!multilevelpushmenu_clicked) {
      // Scrollar bara ifall aktuell sida inte syns. Funkar inte när sidan laddas första gången.
      //if (!$active_menu.visibleInScroll().isContained) {
        setTimeout(function() {
          scroll_to_active_page();
          multilevelpushmenu_clicked = false;
        }, 1000);
    } else {
      select_current_page($active_menu);
    }
}

function scroll_to_active_page() {
  //console.log( 'scroll_to_active_page' );
  var $parent_ul = $(escape_for_jquery('#course_menu_pages #menu[' + course.pages[current_page_key].position + ']')).closest('div.levelHolderClass');
  var $active_menu = $(escape_for_jquery("#menu" + JSON.stringify(course.pages[current_page_key].position)));
  var current_page = get_page_by_position($active_menu.attr('data-position'))
  /*
  $parent_id = $(escape_for_jquery('#course_menu_pages #menu[' + course.pages[current_page_key].position + ']')).parent("ul").attr('data-parent-id');
  $parent_menu = $(escape_for_jquery('#course_menu_pages #' + $parent_id)).parent("div.levelHolderClass");
  */

  var dont_change_to_submenu = false;
  // Kollar om sidan är av en viss typ där man menyn inte ska ändra sig och förhindrar att menyn går in i det kapitlet
  switch (current_page.type) {
    case 12: // Välj övning
    case 13: // Övning
    case 14: // Övningsexempel
    case 15: // Övningsgenomgång
      //case 16: // Övningar och Kunskapstester
      dont_change_to_submenu = true;
      break;
  }

  // var visibleInScroll = $active_menu.visibleInScroll();
  // Räkanr ut postition för att scrolla till aktiell sida
  //var scroll_to = Math.round( $parent_ul.scrollTop() - $parent_ul.offset().top + ( $active_menu.offset().top - 145 ) );

  // Koll om det är en huvudmeny/kapitle med undersidor, men inte pagetype 12,13,14,15. Scrollar i så fall högst upp, annars scrolla till aktuell sida
  // TODO: Den scrollar inte till aktuell sida om man befinner sig inuti en övning (dvs i ett gömt underkapitel) och laddar kursen eftersom if-satsen nedan blir true
  if (current_page_is_chapter() && !dont_change_to_submenu) {
    //console.log( 'scroll to top' );
    //$active_menu.find('div.levelHolderClass').first().scrollTo( 0, 1000 );
    $active_menu.find('div.levelHolderClass').first().scrollTop( 0 );
    select_current_page($active_menu);
  } else {
    $parent_ul.stop(true).scrollTo($active_menu, {duration:500, offset: -100, interrupt:true,
      onAfter: function() {
        requestAnimationFrame(function() {
          select_current_page($active_menu);
        });
      }
    });
  }

}

// Ändrar class på nuvarande sida i menyn så att man ser att den är aktiv.
function select_current_page($element) {
  $('#course_menu_pages li').removeClass("active");
  $element.addClass("active");

  /********************************************************************************************/
  // Loopar igenom alla kapitelsidor upptill huvudnivån och markerar dom

  // Klonar course.pages[current_page_key].position så att inte det ändras.
  page_position = JSON.parse(JSON.stringify(course.pages[current_page_key].position));

  //console.log( page_positions );
  var nr_of_submenus = page_position.length - 2;
  for (i = 0; i <= nr_of_submenus; i++) {
    page_position.pop();
    $(escape_for_jquery("#menu" + JSON.stringify(page_position))).addClass("active");
  }

  /********************************************************************************************/
}

/**
 * Determines whether an element is contained in the visible viewport of its scrolled parents
 *
 * @param goDeep If false or undefined, just check the immediate scroll parent.
 *               If truthy, check all scroll parents up to the Document.
 * @return Object A bounding box representing the element's visible portion:
 *         left: left edge of the visible portion of the element relative to the screen
 *         top: top edge of the visible portion of the element relative to the screen
 *         right: right edge of the visible portion of the element relative to the screen
 *         bottom: bottom edge of the visible portion of the element relative to the screen
 *         width: width of the element
 *         height: height of the element
 *         isVisible: whether any part of the element can be seen
 *         isContained: whether all of the element can be seen
 *         visibleWidth: width of the visible portion of the element
 *         visibleHeight: height of the visible portion of the element
 */

jQuery.fn.visibleInScroll = function (goDeep) {
  var parent = $(this[0]).scrollParent()[0],
    elRect = this[0].getBoundingClientRect(),
    rects = [parent.getBoundingClientRect()];
  elRect = {
    left: elRect.left,
    top: elRect.top,
    right: elRect.right,
    bottom: elRect.bottom,
    width: elRect.width,
    height: elRect.height,
    visibleWidth: elRect.width,
    visibleHeight: elRect.height,
    isVisible: true,
    isContained: true
  };
  var elWidth = elRect.width,
    elHeight = elRect.height;
  if (parent === this[0].ownerDocument) {
    return elRect;
  }

  while (parent !== this[0].ownerDocument && parent !== null) {
    if (parent.scrollWidth > parent.clientWidth || parent.scrollHeight > parent.clientHeight) {
      rects.push(parent.getBoundingClientRect());
    }
    if (rects.length && goDeep) {
      break;
    }
    parent = $(parent).scrollParent()[0];
  }
  if (!goDeep) {
    rects.length = 1;
  }
  for (var i = 0; i < rects.length; i += 1) {
    var rect = rects[i];
    elRect.left = Math.max(elRect.left, rect.left);
    elRect.top = Math.max(elRect.top, rect.top);
    elRect.right = Math.min(elRect.right, rect.right);
    elRect.bottom = Math.min(elRect.bottom, rect.bottom);
  }
  elRect.visibleWidth = Math.max(0, elRect.right - elRect.left);
  elRect.visibleHeight = elRect.visibleWidth && Math.max(0, elRect.bottom - elRect.top);
  if (!elRect.visibleHeight) {
    elRect.visibleWidth = 0;
  }
  elRect.isVisible = elRect.visibleWidth > 0 && elRect.visibleHeight > 0;
  elRect.isContained = elRect.visibleWidth === elRect.width && elRect.visibleHeight === elRect.height;
  return elRect;
};

// Hittar närmste parent-sida av en viss typ utfrån sidan man är på. T.ex för att hitta närmaste "Välj övning"-sida när man är inne i en övning
function get_closest_page_of_type(page_type) {
  var $active_menu = $(escape_for_jquery("#menu" + JSON.stringify(course.pages[current_page_key].position)));
  var current_page = get_page_by_position($active_menu.attr('data-position'))
  var found_page = false;

  if (current_page.type == 12) { // Om sidan man är på redan är av den typen, välj bara den
    $page = $active_menu;
  } else { // Annars så leta upp närmaste sida av typen och markera den i menyn.
    page_position = JSON.parse(JSON.stringify(course.pages[current_page_key].position)); // Klonar page_position så att man inte ändrar i orginalet

    if (page_position.length > 1) { // Kollar om sidan har några undersidor, annars används nuvarande sida
      nr_of_submenus = page_position.length - 2;
      for (i = 0; i <= nr_of_submenus; i++) {

        page_position.pop();
        page = get_page_by_position(page_position);
        if (page.type == 12) {
          found_page = true;
          break;
        }
      }

    } else {
      page = get_page_by_position(page_position);
    }

    if (!found_page) { // Om inte sidan med vald page_type hittats, välj nuvarande sida.
      $page = $active_menu
    } else {
      $page = $(escape_for_jquery('#course_menu_pages #menu[' + page.position + ']')); //.closest('div.levelHolderClass');
    }

  }

  return $page;
}

// Loopar igenom alla kapitelsidor upptill huvudnivån och skapar breadcrumbs_trail
function create_breadcrumbs_trail() {
  // kollar om breadcrumbs_trail elementet finns
  if ($("#course_guide_breadcrumbs_trail").length != 0) {
    $("#course_guide_breadcrumbs_trail").fadeIn('fast');

    var separator = ' > ';

    // Klonar orginalobjektet så att inte det ändras. Funkar inte att klona med $.extend.
    var page_position = JSON.parse(JSON.stringify(course.pages[current_page_key].position));

    //console.log( page_position );
    var nr_of_submenus = page_position.length - 1;
    var breadcrumbs_trail = [];
    var $element, href, page_name;

    //breadcrumbs_trail.push( '<a href="" data-page-id="' + $element.attr('data-page-id') + '">' + $element.find('a').first().text().replace('•','') + '</a>' );
    for (i = 0; i <= nr_of_submenus; i++) {
      $element = $(escape_for_jquery("#menu" + JSON.stringify(page_position)))
      page_name = $element.find('a').first().text().replace('•', '');
      breadcrumbs_trail.push('<a href="' + page_name + '" data-page-id="' + $element.attr('data-page-id') + '">' + page_name + '</a>');
      page_position.pop();
    }

    // Huvudnivå
    breadcrumbs_trail.push('<a href="' + i18next.t("theme.menu.contents") + '" data-page-id="-1">' + i18next.t("theme.menu.contents") + '</a>');

    // Vänder på arrayen så att det visas från huvudmeny och framåt
    breadcrumbs_trail.reverse();

    $("#course_guide_breadcrumbs_trail").html('Du är här: ' + breadcrumbs_trail.join(separator));

    $("#course_guide_breadcrumbs_trail a").off('click').click(function () {
      page_id = parseInt($(this).attr("data-page-id"));
      if (page_id === -1) {
        $('#course_menu_pages').multilevelpushmenu('collapse', 0);
      } else {
        current_page_key = 0;
        get_page(page_id);
      }
      return false;
    })

  }
}

// Kollar om ett element ligger utanför en scrollbar yta
// t.ex jQuery('#parent').isChildOverflowing('#child');
jQuery.fn.isChildOverflowing = function (child) {
  var p = jQuery(this).get(0);
  var el = jQuery(child).get(0);
  return (el.offsetTop < p.offsetTop || el.offsetLeft < p.offsetLeft) ||
    (el.offsetTop + el.offsetHeight > p.offsetTop + p.offsetHeight || el.offsetLeft + el.offsetWidth > p.offsetLeft + p.offsetWidth);
};

function current_page_is_chapter() {
  return typeof course.pages[current_page_key].children_nr_of != 'undefined';
}

// Lägger till ett antal tecken framför sidnamnet beroende på hur lång ner i strukturen den ligger
function add_depth(depth, limiter) {
  var str = "";
  for (i = 1; i <= depth; i++) {
    str += limiter;
  }
  return str;
}

// För debug, listar alla sidor
function debug_show_page_list() {
  var url = parse_and_get_url(window.location);
  var url_path = url.host;
  // Check if under xpectum-domain and add subfolder
  // TODO: can be removed when moved to makemycourse.com-domain
  if(url.host.indexOf('.xpectum.') > 0){
    url_path = url.host + '/make_my_course';
  }
  $('#debug_edit_page a').attr('href', 'https://' + url_path + '/edit.php?id=' + course.pages[current_page_key]["id"]);
  var done = true;
  var debug_missing_movie_css = "";
  var debug_not_done_css = "";
  var page_name = "";
  var category_name = "";
  var debug_select_page_list = [];
  $.each(course.pages, function (key, value) {
    debug_missing_movie_css = "";
    debug_not_done_css = "";

    page_name = value.name;

    if (value.movie_url != undefined) {
      if (value.movie_url == "") {
        debug_missing_movie_css = "missing_movie";
        //page_name += " (SAKNAR FILM) ";
      }
    }

    // Kollar om sidan är klar eller inte. Förutsätter att den är klar, annars hämta status från course_log
    done = true;
    if (value.done != undefined) {
      done = value.done;
      if (!done) {
        debug_not_done_css = "not_done";
      }
    }

    // Skriver ut eventuella kategorier som sidorna ligger under
    if (typeof course_has_categories !== 'undefined') {
      if (course_has_categories) {
        if (category_name != value.category && value.category != undefined && value.category != "") {
          category_name = value.category
          debug_select_page_list.push("<dt>" + category_name + "</dt>");
        }
      }
    }

    if (current_page_key == key) {
      debug_select_page_list.push("<dd><span class='" + debug_missing_movie_css + " " + debug_not_done_css + "' data-page=\"" + key + "\"><strong>" + page_name + "</strong></span></dd>");
    } else {
      debug_select_page_list.push("<dd><span class=\"debug_select_page_list_page " + debug_missing_movie_css + " " + debug_not_done_css + "\" data-page=\"" + key + "\">" + page_name + "</span></dd>");
    }
  });
  $('#debug_select_page #debug_select_page_list').html(debug_select_page_list.join(""));
  // Sätter klickevent på varje sida i debug_menyn
  $("#debug_select_page #debug_select_page_list .debug_select_page_list_page").click(function () {
    //page_id = parseInt($(this).data().page);
    page_id = parseInt($(this).attr("data-page"));
    current_page_key = 0;
    get_page(page_id);
  });
}

// Funktionen hämtar nästa film-event
function get_next_movie_event(events, time, video, container) {
  // Eventets innehåll
  event_content = "";

  // Loopar igenom eventlistan
  $.each(events, function (key, value) {

    //console.log(key + ": time:" + time + ", start: " + value.start_time + ", dur: " + value.duration);

    // Kollar om eventet ska gömmas efter en viss tid
    if (time >= (value.start_time + value.duration) && value.triggered == true && current_event_key == key) {
      if (value.duration != 0) {
        hide_event_container(container);
        current_event_key = -1;
      }
    }

    if (time >= value.start_time && value.triggered == false) {
      // Sparar unden vilken event som visas så att man kan gömma det sen
      current_event_key = key;

      // Innehållet i eventet
      event_content = value.content;

      // Flaggar eventet när det triggas
      value.triggered = true;

      current_page_event_key = key;

      // Pausar video
      if (value.pause) $("video")[0].pause();

      // Gömmer video om kursen körs på iPad och är pausad
      if (is_ipad() && value.pause) $("video").css({
        visibility: "hidden"
      });

      // Visar eventet
      container.html(event_content);
      set_language();

      // Kollar om eventen innehåller en fortsätt-knapp och fixar så att filmen fortsätter spela om man trycker på den
      continue_button = ($("#" + $(container).attr("id") + " #event-continue_button"));
      if (continue_button.length > 0) {

        $(continue_button).off('click').click(function () {
          hide_event_container(container);
          current_event_key = -1;

          if (is_ipad()) $("video").css({
            visibility: "visible"
          });
          play_video($("video")[0]);
        });
      }

      // Kollar om eventen innehåller en "se filmen igen"-knapp
      watch_movie_again_button = ($("#" + $(container).attr("id") + " #watch_movie_again_button"));
      if (watch_movie_again_button.length > 0) {
        $(watch_movie_again_button).off('click').click(function () {
          hide_event_container(container);
          current_event_key = -1;

          if (is_ipad()) $("video").css({
            visibility: "visible"
          });

          $("video")[0].currentTime = 0;
          play_video($("video")[0]);
        });
      }

      show_event_container(container);

      // Om det är en fråge sida, kolla om användaren redan har svarat på eventet och visar vad man svarat
      //console.log(user_log);
      //console.log(current_page_key);
      switch (course.pages[current_page_key].type) {
        case 6:
          if (!$.isEmptyObject(user_log.pages[current_page_key].answers)) {
            if (!$.isEmptyObject(user_log.pages[current_page_key].answers.question_answers[current_event_key])) {
              // Kollar om det är ett fritextsvar
              if ($("#free_text").length != 0) {
                var free_text = user_log.pages[current_page_key].answers.question_answers[current_event_key].answer.replace(/<br\s*[\/]?>/gi, "\n");
                $("#free_text").val(free_text);
              } else {
                question_click($("#questions #" + user_log.pages[current_page_key].answers.question_answers[current_event_key].clicked_button), false);
              }
            }
          }
          break;
      }

      // Avslutar loopen efter triggat event
      return false;
    }
  });
}

// Nollställer alla kommande events i listan
function reset_upcoming_events(current_time) {
  // Loopar igenom alla events
  $.each(events, function (key, value) {
    // Kontrollerar om starttiden för kommande events är högre än den spolade tiden
    // Kollar även om eventetn är "repeatable"
    if (value.start_time >= current_time && value.repeatable) {
      // Nollställer trigger-flaggan
      value.triggered = false;
    }
  });
}

function toggleControls(video) {
  if (video.hasAttribute("controls")) {
    video.removeAttribute("controls")
  } else {
    video.setAttribute("controls", "controls")
  }
}

// Funktionen kollar om kursen körs på mobil
function is_ipad() {
  var isMobile = {
    Windows: function () { // Must be checked first since Microsoft also put "Android" and "iPhone" into the userAgent String
      return /IEMobile/i.test(navigator.userAgent);
    },
    Android: function () {
      return /Android/i.test(navigator.userAgent);
    },
    BlackBerry: function () {
      return /BlackBerry/i.test(navigator.userAgent);
    },
    iOS: function () {
      return /iPhone|iPad|iPod/i.test(navigator.userAgent);
    },
    any: function () {
      return (isMobile.Windows() || isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS());
    }
  };

  //return !! navigator.userAgent.match(/iPad/i);
  return isMobile.any();
}

// Visar event-containern
function show_event_container(container) {
  container.fadeIn("fast");
}

// Gömmer event-containern
function hide_event_container(container) {
  container.fadeOut("fast");
}

// EJ TESTAD Konverterar sträng (True/False) till boolean
function convert_string_to_boolean(str) {

  if (typeof str === 'string') {
    if (str == "false") {
      bool = false;
    } else if (str == "true") {
      bool = true;
    } else {
      bool = false;
    }
    return bool;
  } else {
    return str;
  }
}

var countdown_time = 0;
/*$.countdown.regional['sv'] = {
  labels: ['år', 'månader', 'veckor', 'dagar', 'timmar', 'minuter', 'sekunder'],
  labels1: ['år', 'månad', 'vecka', 'dag', 'timme', 'minut', 'sekund'],
  compactLabels: ['Å', 'M', 'V', 'D'],
  whichLabels: null,
  timeSeparator: ':', isRTL: false,
  format: 'dHMS'};
$.countdown.setDefaults($.countdown.regional['sv']);
*/
function countup_start() {
  // Stannar och tar bort alla timers
  $('#countup_seconds').countdown('destroy');
  $('#countup_total_seconds').countdown('destroy');

  //console.log("page_time: " + user_log.pages[current_page_key].time_visited);
  //console.log("total_time: " + total_course_time);

  $('#countup_seconds').countdown({
    since: -user_log.pages[current_page_key].time_visited,
    layout: '{sn} {sl}',
    format: "S"
  });

  $('#countup_total_seconds').countdown({
    since: -total_course_time,
    layout: '{sn} {sl}',
    format: "S"
  });
}

// Shuffle array
function fisher_yates(my_array) {
  var i = my_array.length;
  if (i == 0) return false;
  while (--i) {
    var j = Math.floor(Math.random() * (i + 1));
    var tempi = my_array[i];
    var tempj = my_array[j];
    my_array[i] = tempj;
    my_array[j] = tempi;
  }
}

function set_readmore_button() {
  $(".read-more-button").off("click").on("click", function () {
    the_button = $(this);

    // Read more-innehållet
    read_more_content = $(this).parent().parent().find(".read-more-content");

    // Visar och gömmer innehållet i "Läs mer"
    read_more_content.fadeToggle("fast", function () {
      // Ändrar CSS-klassen på knappen
      if (read_more_content.css("display") == "block") {
        the_button.addClass("selected");
      } else {
        the_button.removeClass("selected");
        handle_bottom_bar();
      }
    });
  });
  $(".read-more-button").localize();
}

/**
 * Fixerar bottom_bar när kursfönstret förminskas i höjdled
 */
function handle_bottom_bar() {
  /*
    window_height = $(window).scrollTop() + $(window).height() - $('#bottom_bar').outerHeight();
    course_height = $('#course_content').offset().top + $('#course_content').height() - $('#bottom_bar').outerHeight();

    // console.log('Window height: ' + window_height);
    // console.log('Course height: ' + course_height);

    if(course_height > window_height) {
      // Visar en dummy-div som tar upp lika stor plats som bottom_bar så att det inte blir ett "hopp" i scrollningen.
      $('.bottom_bar_dummy').show();

      // Fäster bottom_bar i fönstrets nederkant.
      $('#bottom_bar').addClass('sticky');
    } else {
      $('#bottom_bar').removeClass('sticky');
      $('.bottom_bar_dummy').hide();
    }
  */
}

function is_last_page_in_course(){
  if(current_page_key == course.pages.length-1){
    return true;
  } else {
    return false;
  }
}

// Hämtar totalpoängen för kursen
function get_totalt_points_for_course() {

  var total_course_points = 0;

  $.each(course.pages, function(page_key, page) {
    var points = 0;
    switch(page.type) {
      case 3: // sant eller falskt
        // console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        if(page.page_content != null){
          if (page.page_content.questions == undefined) {
            // Hittar positionen i json-strukturen vart frågorna finns
            var questions_content_key = 0;
            $.each(page.page_content.page_contents, function(content_key, content) {
              if ( content.true_or_false != undefined ) {
                questions_content_key = content_key;
              }
            });
            questions = page.page_content.page_contents[questions_content_key].true_or_false.questions;
          } else {
            questions = page.page_content.questions
          }

          $.each(questions, function(question_key, question) {
            total_course_points += question.points;
          });
        }
        break;
      case 6: // film med frågor och respons. Utgår från att maxpoängen är 300 på varje
        // console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        /*
        total_course_points += 300;
        */
        break;
      case 7: // Quiz checkbox, radio fritext
        //console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        if(page.page_content != null){
          if (page.page_content.questions == undefined) {
            // Hittar positionen i json-strukturen vart frågorna finns
            var questions_content_key = 0;
            $.each(page.page_content.page_contents, function(content_key, content) {
              if ( content.questions != undefined ) {
                questions_content_key = content_key;
              }
            });
            questions = page.page_content.page_contents[questions_content_key].questions.questions;
          } else {
            questions = page.page_content.questions
          }

          $.each(questions, function(question_key, question) {
            total_course_points += question.points;
          });
        }
        break;
      case 8: // Dra och släpp test
        // console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        /*
        points_per_item = page.dragndrop.points_per_item;
        $.each(page.page_content.items, function(item_key, item) {
          if(item.targets != undefined) {
            total_course_points += item.targets.length*points_per_item;
            points += item.targets.length*points_per_item;
          }
        });
        */
        break;
      case 9: // Jeopardy
        // console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        var jeopardy_points = 0;
        if (page.page_content.percent_pass == undefined) {
          // Hittar positionen i json-strukturen vart frågorna finns
          var questions_content_key = 0;
          $.each(page.page_content.page_contents, function(content_key, content) {
            if ( content.jeopardy != undefined ) {
              questions_content_key = content_key;
            }
          });
          jeopardy = page.page_content.page_contents[questions_content_key].jeopardy;
        } else {
          jeopardy = page.page_content
        }

        $.each(jeopardy.categories, function(category_key, category) {
          $.each(category.questions, function(question_key, question) {
            jeopardy_points += question.points;
          });
        });
        total_course_points += jeopardy_points;
        break;
      /*case 17: // Supermall, HTML, CSS och JavaScript. Går det ens att få ut nåt vetigt, typ poäng, från en sån?
        // console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        //var content = $($.parseHTML(page.content)).filter('#dragndrop');
        var content = $('#dragndrop', $(page.content));
        if (content.length != 0 ) {
          console.log( content );
        }
        break;*/
      case 19: // "Matcha ord",
        // console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        var content = $(page.content).find('.check_check');
        total_course_points += (content.length * 50);
        break;
      case 20: // "Fritextfråga" - Alltid bara ett svar med 50 poäng
        // console.log("--> " + page_key + " : " + page.name + ", type: " + page.type + " <---" );
        //console.log( JSON.stringify(user_log.pages[page_key], null, 2));
        total_course_points += 50;
        break;
    }
    /*if(points != 0)	{
      debug(page_key, page, points);
    }*/
  });

  return total_course_points;
}

function collect_user_answers_and_report_for_course (page_number, name, type, quesitions_and_user_answers, user_page_points, page_points) {
  template_names = {
    "3"  : i18next.t('page_type.true_or_false'),
    "4"  : i18next.t('page_type.rank'),
    "5"  : i18next.t('page_type.evaluation'),
    "6"  : i18next.t('page_type.movie_with_questions_and_response'),
    "7"  : i18next.t('page_type.quiz'),
    "8"  : i18next.t('page_type.drag_and_drop'),
    "9"  : i18next.t('page_type.jeopardy'),
    "18" : i18next.t('page_type.gallup'),
    "19" : i18next.t('page_type.match_words'),
    "20" : i18next.t('page_type.freetext_answer')
  };

  answers_and_user_report = {};
  answers_and_user_report.page_number    = page_number+1;
  answers_and_user_report.name           = name;
  answers_and_user_report.type           = type;
  answers_and_user_report.template_name = template_names[type];
  answers_and_user_report.quesitions_and_user_answers = quesitions_and_user_answers;

  if (user_page_points !== "" && user_page_points !== "") {
    answers_and_user_report.user_page_points = user_page_points;
    answers_and_user_report.page_points = page_points;
  }
  //console.log( JSON.stringify(answers_and_user_report, null, 2));
  return  answers_and_user_report;
}

// Hämtar totalpoängen för kursen
function get_user_answers_and_report_for_course() {
  /*
  3: "Sant/falskt",
  4: "Rangordna",
  5: "Utvärdering",
  6: "Film med frågor och respons",
  7: "Radio - Checkbox - Fritext",
  8: "Dra och släpp test",
  9: "Jeopardy",
  18: "Gallup - Radio - Checkbox - Fritext",
  19: "Matcha ord",
  20: "Fritextfråga"
  */
  var page;
  var user_page_points = 0;
  var page_points = 0;
  var page_number = 0;
  var user_report = [];

  if ( user_log.pages.length > course.pages.length ) {
    /* Användarloggen och kursloggen stämmer inte överens */
    user_report = {
                    "error": {
                      "code": -1,
                      "message": "The user log and course log do not match"
                    }
                  }
  } else {
    $.each(user_log.pages, function(page_key, user_log_page) {
      page = course.pages[page_key];
      user_page_points = 0;
      page_points = 0;
      page_number = page_key+1;
      switch(page.type) {
        case 3: // sant eller falskt
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          if (page.page_content.questions == undefined) {
            // Hittar positionen i json-strukturen vart frågorna finns
            var questions_content_key = 0;
            $.each(page.page_content.page_contents, function(content_key, content) {
              if ( content.true_or_false != undefined ) {
                questions_content_key = content_key;
              }
            });
            questions = page.page_content.page_contents[questions_content_key].true_or_false.questions;
          } else {
            questions = page.page_content.questions
          }

          // console.log( JSON.stringify(questions, null, 2));
          // console.log( JSON.stringify(user_log_page, null, 2));

          user_page_points = user_log_page.points;

          $.each(questions, function(question_key, question) {
            page_points += question.points;
          });

          user_report.push(collect_user_answers_and_report_for_course(page_key, page.name, page.type,'', user_page_points, page_points));
          break;
        case 5: // Utvärdering
          //console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          break;
        case 6: // film med frågor och respons. Utgår från att maxpoängen är 300 på varje
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          /*
          total_course_points += 300;
          points = 300;
          */
          break;
        case 7: // Quiz checkbox, radio fritext
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          if (page.page_content.questions == undefined) {
            // Hittar positionen i json-strukturen vart frågorna finns
            var questions_content_key = 0;
            $.each(page.page_content.page_contents, function(content_key, content) {
              if ( content.questions != undefined ) {
                questions_content_key = content_key;
              }
            });
            questions = page.page_content.page_contents[questions_content_key].questions.questions;
          } else {
            questions = page.page_content.questions
          }

          user_page_points = user_log_page.points;

          $.each(questions, function(question_key, question) {
            page_points += question.points;
          });

          user_report.push(collect_user_answers_and_report_for_course(page_key, page.name, page.type,'', user_page_points, page_points));
          break;
        case 8: // Dra och släpp test
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          /*
          points_per_item = page.dragndrop.points_per_item;
          $.each(page.page_content.items, function(item_key, item) {
            if(item.targets != undefined) {
              total_course_points += item.targets.length*points_per_item;
              points += item.targets.length*points_per_item;
            }
          });
          */
          break;
        case 9: // Jeopardy
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          var jeopardy_points = 0;
          if (page.page_content.percent_pass == undefined) {
            // Hittar positionen i json-strukturen vart frågorna finns
            var questions_content_key = 0;
            $.each(page.page_content.page_contents, function(content_key, content) {
              if ( content.jeopardy != undefined ) {
                questions_content_key = content_key;
              }
            });
            jeopardy = page.page_content.page_contents[questions_content_key].jeopardy;
          } else {
            jeopardy = page.page_content
          }

          user_page_points = user_log_page.points;

          $.each(jeopardy.categories, function(category_key, category) {
            $.each(category.questions, function(question_key, question) {
              jeopardy_points += question.points;
            });
          });
          page_points = jeopardy_points;

          user_report.push(collect_user_answers_and_report_for_course(page_key, page.name, page.type,'', user_page_points, page_points));
          break;
        /*case 17: // Supermall, HTML, CSS och JavaScript. Går det ens att få ut nåt vetigt, typ poäng, från en sån?
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          //var content = $($.parseHTML(page.content)).filter('#dragndrop');
          var content = $('#dragndrop', $(page.content));
          if (content.length != 0 ) {
            console.log( content );
          }
          break;*/
        case 18: // "Gallup - Radio - Checkbox - Fritext",
          //console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <--" );

          // Gör en deep copy på objektet och loopar igenom det och för att kunna ta bort sånt som inte ska vara med i orginalobjectet.
          // Det matchar då användarens svar i användarloggen och man kan visa fråga/svar, fråga/svar osv
          var page_content = JSON.parse(JSON.stringify(page.page_content.page_contents))

          var question_counter = 0;
          var questions_and_answers = [];
          var user_questions_and_answers = {};

          $.each(page_content, function(question_key, question) {

            keys = Object.keys(question);
            switch (keys[0]) {
              case "text":
                user_questions_and_answers = { text : '', answer : ''}
                //questions_and_answers.question = $(question.text).text();
                //questions_and_answers.question.push({ "question" : $(question.text).text() });
                /* var HMTLtexts = '';
                 $.each($(question.text), function(HMTLtext_key, HMTLtext) {
                    HMTLtexts += $(HMTLtext).html();
                 });
                user_questions_and_answers.text = remove_tags(HMTLtexts);
                */
                user_questions_and_answers.text = question.text.replace("<p></p>", "").replace("</p><p>", "<br/><br/>").replace("<p>", "").replace("</p>", "");
                questions_and_answers[question_counter] = user_questions_and_answers;              
                break;
              case "freetext_answer":
                //questions_and_answers.answer = nl2br(user_log_page.answers[question_counter].answer);
                //questions_and_answers.answer.push({ "answer" : nl2br(user_log_page.answers[question_counter].answer) });

                if (user_log_page.answers != undefined) {
                  user_questions_and_answers.answer = nl2br(user_log_page.answers[question_counter].answer);
                  questions_and_answers[question_counter] = user_questions_and_answers;
                }
                question_counter++;
                break;
              case "gallup_questions":

                questions_and_answers = [];
                var user_log_quiz_answer = "";
                $.each(question.gallup_questions.questions, function(gallup_question_key, gallup_question) {
                  user_log_quiz_answer = "";
                  if(user_log_page.answers != undefined){
                    if(user_log_page.answers.quiz_answers != undefined){
                      user_log_quiz_answer = user_log_page.answers.quiz_answers[gallup_question_key]
                    }
                  }
                  questions_and_answers.push({
                                              "type"         : gallup_question.type,
                                              "question"     : gallup_question.question,
                                              "answers"      : gallup_question.answers,
                                              "user_answers" : user_log_quiz_answer
                                            })
                });
                break;
            }
          });

          user_report.push(collect_user_answers_and_report_for_course(page_key, page.name, page.type,questions_and_answers, "", ""));
          break;
        case 19: // "Matcha ord",
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );

          var content = $(page.content).find('.check_check');
          page_points += (content.length * 50);

          if(user_log_page.points !== undefined) {
            user_page_points = user_log_page.points;
          } else {
            user_page_points = page_points;
          }

          user_report.push(collect_user_answers_and_report_for_course(page_key, page.name, page.type,'', user_page_points, page_points));
          break;
        case 20: // "Fritextfråga" - Alltid bara ett svar med 50 poäng
          // console.log("--> " + page_number + " : " + page.name + ", type: " + page.type + " <---" );
          user_page_points = 50;
          page_points = 50;
          user_report.push(collect_user_answers_and_report_for_course(page_key, page.name, page.type,'', user_page_points, page_points));
          break;
      }
    });
  }

  return user_report;
}

// remove html tags but keeps newline
function remove_tags(html) {
  html = html.replace(/<br\/?>/g, "$br$");
  html = html.replace(/(?:\r\n|\r|\n)/g, '$br$');

  var tmp = document.createElement("DIV");
  tmp.innerHTML = html;
  html = tmp.textContent || tmp.innerText;
  html = html.replace(/\$br\$/g, "<br/>");
  return html;
}

function show_user_answers_and_report_for_course(user_report) {
  //console.log( JSON.stringify(user_report, null, 2));
  var html_report = [];
  user_course_current_position = get_course_pos();
  //console.log( user_course_current_position.current == report.page_number );
  $.each(user_report, function(report_key, report) {
    if(user_course_current_position.current == report.page_number){
      user_position_icon = '<i class="fa fa-user fa-lg" aria-hidden="true"></i>';
    } else {
      user_position_icon = '';
    }
    html_report.push('<div class="user_report">' + user_position_icon + '<h3>' + i18next.t('text.page') + ' ' + report.page_number + ' - ' + report.name  + '</h3>');
    html_report.push('<h4>' + report.template_name + '</h4>');
    switch (report.type) {
      case 18: // Gallup - visa frågor och svar
        $.each(report.quesitions_and_user_answers, function(question_key, question) {

          if(question.answer == undefined) { // Kollar om det är quiz eller fritextsvar

            var user_answers = "";

            // Om det är envals sparas det som ett number. Är det flervalsfråga sparas det som en kommaseparerad sträng
            //console.log( question );
            if(question.user_answers.clicked_answer != undefined){
              switch (question.type) {
                case "radio":
                case "checkbox":
                  user_answers = question.user_answers.clicked_answer.toString().split(',');
                  user_answers == undefined ? question.user_answers.clicked_answer : [user_answers];    
                  break;
                case "textarea":
                  user_answers = [question.user_answers.clicked_answer];
                  break;
              } 
            }

            if(user_answers.length != 0){
              var answers = '<ul>';
              switch (question.type) {
                case "radio":
                case "checkbox":
                  for (var i = 0; i < user_answers.length; i++) {
                    answers += '<li>' + question.answers[user_answers[i]-1] + '</li>';
                  }
                  break;
                case "textarea":
                  answers += '<li>' + nl2br(user_answers[0]) + '</li>';
                  break;
              } 
              answers += '</ul>'
            } else {
              answers = i18next.t('text.no_answer');
            }
            html_report.push('<dl> \
              <dt>' + i18next.t('text.question') + ':</dt><dd>' + question.question + '</dd> \
              <dt>' + i18next.t('text.answer') + ':</dt><dd><strong>' + answers + '</strong></dd> \
            </dl>');
          } else {
            html_report.push('<dl> \
                                <dt>' + i18next.t('text.question') + ':</dt><dd>' + question.text + '</dd>\
                                <dt>' + i18next.t('text.answer') + ':</dt><dd><strong>' + (question.answer == "" ? i18next.t('text.no_answer') : question.answer) + '</strong></dd> \
                              </dl>');
          }
        });
        break;
      default: // Annars visa bara resultat/poäng
        html_report.push('<p>' + report.user_page_points + ' ' + i18next.t('text.of') + ' ' + report.page_points + ' ' + i18next.t('text.points') +  '<p>');
        break;
    }
    html_report.push('</div>')
    //console.log( JSON.stringify(report, null, 2));
  });
  return html_report.join('');
}

function get_html_user_report_for_course() {
  var user_report = get_user_answers_and_report_for_course();
  var html_report = '';
  if ( user_report.error == undefined ) {
    if (user_report.length != 0 ){
      html_report = show_user_answers_and_report_for_course(user_report);
    }
  } else {
    html_report = user_report;
  }
  return html_report;
}

/*function countup_pause()
{
  $('#countup_total_seconds').countdown('pause');
  $('#countup_seconds').countdown('pause');
}
function countup_resume()
{
  $('#countup_total_seconds').countdown('resume');
  $('#countup_seconds').countdown('resume');
}
function countup_stop()
{
  $('#countup_seconds').countdown('destroy');
}*/

// OVERRIDE fortsätt-knapp
/*$("#event_container").live("click", function() {
  hide_event_container($("#event_container"));
  if(is_ipad()) $("video").css({visibility:"visible"});
  play_video($("video")[0]);
});*/

// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate` is passed, trigger the function on the
// leading edge, instead of the trailing.
function debounce(func, wait, immediate) {
  var timeout;
  return function () {
    var context = this,
      args = arguments;
    var later = function () {
      timeout = null;
      if (!immediate) func.apply(context, args);
    };
    var callNow = immediate && !timeout;
    clearTimeout(timeout);
    timeout = setTimeout(later, wait);
    if (callNow) func.apply(context, args);
  };
};

// If an event doesn't exist, check for your desired state at intervals:
// Usage:
/*
    poll(
      function () {
        // Condition
        return that.value.length;
      },
      // Success
      function () {
        // ...
      },
      // Error
      function () {
        // ...
      },
      3000, // Poll timeout
      50 // Poll interval
    );
*/
function poll(fn, callback, errback, timeout, interval) {
  var endTime = Number(new Date()) + (timeout || 2000);
  interval = interval || 100;
    (function p() {
      // If the condition is met, we're done!
      if(fn()) {
        callback();
      }
      // If the condition isn't met but the timeout hasn't elapsed, go again
      else if (Number(new Date()) < endTime) {
        setTimeout(p, interval);
      }
      // Didn't match and too much time, reject!
      else {
        errback(new Error('timed out for ' + fn + ': ' + arguments));
      }
  })();
}

// Chunks an array into arrays with size elements. The last chunk may contain less than size elements.
function array_chunk(arr, len) {

  var chunks = [],
    i = 0,
    n = arr.length;

  while (i < n) {
    chunks.push(arr.slice(i, i += len));
  }

  return chunks;
}

function pnotify_show(title, text, type, delay, modal, hide, remove_all, maxonscreen){
  // Kollar först så att PNotify finns, måste finns i temat för att det ska fungera.
  if(typeof PNotify == 'function'){
    /* var context = $('#pnotify_context');
    if(context.length === 0){
      $('body').append('<div id="pnotify_context"></div>');
    } */

    type = typeof type !== 'undefined' ? type : 'sucess';
    delay = typeof delay !== 'undefined' ? delay : 4000;
    modal = typeof modal !== 'undefined' ? modal : false;
    hide = typeof hide !== 'undefined' ? hide : true;
    remove_all = typeof remove_all !== 'undefined' ? remove_all : false;
    maxonscreen = typeof maxonscreen !== 'undefined' ? maxonscreen : 3;

    modal = modal === 'modal' ? true : false;
    hide = hide === 'hide' ? true : false;
    remove_all = remove_all === 'remove_all' ? true : false;

    if (typeof pnotify_stack_top_right === "undefined") pnotify_stack_top_right =
      {"dir1": "down", "dir2": "right", "push": "bottom", "spacing1": 15, "spacing2": 15, "modal": modal, "overlay_close": true/* , context: $('#pnotify_context') */};
      //{"dir1": "down", "dir2": "right", "push": "bottom", "modal": modal, "overlay_close": true};

    var pnotify_opts = {
      // cornerclass: "",
      // width: "70%",
      hide: hide,
      destroy: true,
      buttons: {
        closer_hover: false,
        sticker: false,
        labels: {
            close: i18next.t('theme.pnotify.load.close'),
            stick: i18next.t('theme.pnotify.load.stick'),
            unstick: i18next.t('theme.pnotify.load.unstick')
          }
      },
      history: {
        history: false,
        maxonscreen: maxonscreen
      },
      stack: pnotify_stack_top_right/* ,
      after_close: function(notice, timer_hide) {
        console.log('I\'m called after the notice closes. I\'m passed the PNotify object for the current notice: ' + notice);
        console.log('I also have an argument called timer_hide, which is true if the notice was closed because the timer ran down. Value: ' + timer_hide);
      } */
    };
    PNotify.prototype.options.delay = delay;

    pnotify_opts.title = title;
    pnotify_opts.text = text;
    pnotify_opts.type = type;

    if(remove_all && PNotify.notices.length > 0) {
      PNotify.removeAll();

      // Kollar så att alla PNotify är borta innan nästa visas
      poll(
        function () {
          // console.log( 'ui-pnotify:' + $('.ui-pnotify').length );
          // console.log( 'PNotify.notices:' + PNotify.notices.length );
          return $('.ui-pnotify').length == 0;
        },
        // Success
        function () {
          var notice = new PNotify(pnotify_opts);
          notice.get().click(function() {
            notice.remove();
          })
        },
        // Error
        function () {
        },
        5000, // Poll timeout
        100 // Poll interval
      );
    } else {
      var notice = new PNotify(pnotify_opts);
      notice.get().click(function() {
        notice.remove();
      })
    }

  }
}

function new_pnotify(pnotify_opts){
  var notice = new PNotify(pnotify_opts);
  notice.get().click(function() {
    notice.remove();
  })
}

// Slår ihop en array till en sträng med komma mellan förutom i slutet där man kan lägga in en bindeord, t.ex och/eller.
/* Exempel:
  $array = array("1 år", "2 månader", "3 dagar");
  console.log( conjunction_array($array, "och"));
  Output: 1 år, 2 månader och 3 dagar"
*/
function conjunction_array(array, conjunction, end_conjunction) {
  if (array.length <= 1) {
    return array.join("");
  }
  ll = array.pop();
  return array.join(conjunction + ' ') + ' ' + end_conjunction + ' ' + ll;
}


/* 
  Try to keep the session alive if the user is doing a difficult exercise, or test exam 
*/
// Not during preview
if(typeof preview != 'undefined'){
  if (!preview) {

    var setIntervalTime = 600000; // 600000 ms = 10 minutes, 900000 ms = 15 minutes, 60000 ms = 1 minute

    setInterval(function(){
      // Post current user info and course info
      post_data = "&user_info=" + JSON.stringify(user_info);
      post_data += "&course_info=" + '{"course_id":' + course_info["course_id"] + ', "kursLanguage":"' + course_info["kursLanguage"] + '"}';
      $.post('../../ajax.keep-alive.php', post_data)
      .done(function(data, textStatus, jqXHR) {
        //console.log( data, textStatus, jqXHR );

        // Tests if it is possible to parse the returned data
        try {
          data = $.parseJSON(data);
        } catch(err) {
          var data = { status: "failed", message: err + '\n' + jqXHR.responseText };
        };

        switch(data.status) {
          case "success": // Everything went well
            //console.log( data );
            break;
          default: // Something went wrong. Displays error message
            //console.log( data );
            break;
        }
      })
      .fail(function(jqXHR, textStatus, errorThrown) {
        console.log( jqXHR, textStatus, errorThrown );
      })
    }, setIntervalTime);

  }
}