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kane77 / Duolingo Course Progress

// ==UserScript==
// @name        Duolingo Course Progress
// @namespace   https://github.com/kane77/userscripts
// @include     https://www.duolingo.com/*
// @version     1.5
// @grant GM_getValue
// ==/UserScript==
function inject(f) { //Inject the script into the document
  var script;
  script = document.createElement('script');
  script.type = 'text/javascript';
  script.setAttribute('name', 'lesson_stats');
  script.textContent = '(' + f.toString() + ')(jQuery)';
  document.head.appendChild(script);
}
inject(f);
function f($) {
  function duolingoStats() {
    try {
      var langData = window.duo.user.attributes.language_data[window.duo.user.attributes.learning_language];
      var totalSkills = langData.skills.models.length;
      var doneSkills = 0;
      var totalActivities = 0;
      var doneActivities = 0;
      for (var i = 0; i < langData.skills.models.length; i++) {
        var skill = langData.skills.models[i];
        totalActivities += skill.attributes.num_lessons;
        doneActivities += skill.attributes.num_lessons - skill.attributes.missing_lessons;
        if (skill.attributes.missing_lessons == 0) {
          doneSkills += 1;
        }
      }
      if (langData.bonus_skills) {
        totalSkills += langData.bonus_skills.length;
        for (var i = 0; i < langData.bonus_skills.models.length; i++) {
          var skill = langData.bonus_skills.models[i];
          totalActivities += skill.attributes.num_lessons;
          doneActivities += skill.attributes.num_lessons - skill.attributes.missing_lessons;
          if (skill.attributes.missing_lessons == 0) {
            doneSkills += 1;
          }
        }
      }
      var lessonPercent = Math.round(doneActivities / totalActivities * 100);
      var skillPercent = Math.round(doneSkills / totalSkills * 100);
      var stats = $('<ul class="sidebar-stats lesson-progress"><li title="' + skillPercent + '%"><span class="icon icon-words-small">S</span><strong><span id="skill">' + doneSkills + '/' + totalSkills + '</span></strong> Skills</li><li title="' + lessonPercent + '%"><span class="icon icon-words-small">L</span><strong><span id="skill">' + doneActivities + '/' + totalActivities + '</span></strong> Lessons</li></ul>');
      if ($('#app').hasClass('home') && !$('.lesson-progress').length) {
        $('.strengthen-skills-container').before(stats);
      }
    } catch (ex) {
      console.log(ex);
    }
  }

  $(document).ready(function () {
    duolingoStats();
  });
  $(document).ajaxComplete(function () {
    duolingoStats();
  });
}