(function() {
  var emoji = <%= Dir.glob(File.expand_path("../../../public/images/*.png", __FILE__)).map{|f| File.basename(f).split(".")[0]}.inspect %>;

  function imageFor(code) {
    if (emoji.indexOf(code) !== -1) {
      var url = Discourse.getURL('/plugins/emoji/images/' + code + '.png');
      return ['img', {href: url, title: ':' + code + ':', 'class': 'emoji', alt: code}];
    }
  }

  // Also support default emotions
  var translations = {
    ':)'   : 'smile',
    ':-)'   : 'smile',
    ':('   : 'frowning',
    ':-('   : 'frowning',
    ';)'   : 'wink',
    ';-)'   : 'wink',
    ':\'(' : 'cry',
    ':\'-(' : 'cry',
    ':-\'(' : 'cry',
    ':p'   : 'stuck_out_tongue',
    ':P'   : 'stuck_out_tongue',
    ':-P'   : 'stuck_out_tongue',
    ':O'   : 'open_mouth',
    ':-O'   : 'open_mouth',
    ':D'   : 'smiley',
    ':-D'   : 'smiley',
    ':|'   : 'expressionless',
    ':-|'   : 'expressionless',
    ";P"   : 'stuck_out_tongue_winking_eye',
    ";-P"   : 'stuck_out_tongue_winking_eye',
    ';)'   : 'wink',
    ';-)'   : 'wink',
    ":$"   : 'blush',
    ":-$"   : 'blush'
  };

  function checkPrev(prev) {
    if (prev && prev.length) {
      var lastToken = prev[prev.length-1];
      if (lastToken && lastToken.charAt) {
        var lastChar = lastToken.charAt(lastToken.length-1);
        if (lastChar !== ' ' && lastChar !== "\n") return false;
      }
    }
    return true;
  }

  var translationsWithColon = {};
  Object.keys(translations).forEach(function (t) {
    if (t[0] === ':') {
      translationsWithColon[t] = translations[t];
    } else {
      var replacement = translations[t];
      Discourse.Dialect.inlineReplace(t, function (token, match, prev) {
        if (!Discourse.SiteSettings.enable_emoji) { return token; }
        return checkPrev(prev) ? imageFor(replacement) : token;
      });
    }
  });

  function escapeRegExp(s) {
    return s.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&')
  }

  var translationColonRegexp = new RegExp(Object.keys(translationsWithColon).map(function (t) {
                                             return "(" + escapeRegExp(t) + ")";
                                           }).join("|"));

  Discourse.Dialect.registerInline(':', function(text, match, prev) {
    if (!Discourse.SiteSettings.enable_emoji) { return; }

    var endPos = text.indexOf(':', 1),
        firstSpace = text.search(/\s/),
        contents;

    if (!checkPrev(prev)) { return; }

    // If there is no trailing colon, check our translations that begin with colons
    if (endPos === -1 || (firstSpace !== -1 && endPos > firstSpace)) {
      translationColonRegexp.lastIndex = 0;
      var m = translationColonRegexp.exec(text);
      if (m && m[0] && text.indexOf(m[0]) === 0) {

        // Check outer edge
        var lastChar = text.charAt(m[0].length);
        if (lastChar && (lastChar !== ' ' && lastChar !== "\n")) return;
        contents = imageFor(translationsWithColon[m[0]]);
        if (contents) {
          return [m[0].length, contents];
        }
      }
      return;
    }

    // Simple find and replace from our array
    var between = text.slice(1, endPos);
    contents = imageFor(between);
    if (contents) {
      return [endPos+1, contents];
    }
  });

  // TODO: Make this a proper ES6 import
  var ComposerView = (Discourse && Discourse.ComposerView) || (typeof require !== "undefined" && require('discourse/views/composer').default);
  if (ComposerView) {
    ComposerView.on("initWmdEditor", function(event){
      if (!Discourse.SiteSettings.enable_emoji) { return; }

      var baseUrl = Discourse.getURL("/");

      template = Handlebars.compile("<div class='autocomplete'>" +
                                       "<ul>" +
                                          "{{#each options}}" +
                                              "<li>" +
                                                "<a href='#'>" +
                                                "<img src='" + baseUrl + "plugins/emoji/images/{{this}}.png?v=1' class='emoji'> " +
                                                "{{this}}</a>" +
                                              "</li>" +
                                          "{{/each}}" +
                                       "</ul>" +
                                    "</div>");

      $('#wmd-input').autocomplete({
        template: template,
        key: ":",
        transformComplete: function(v){ return v + ":"; },
        dataSource: function(term){

          var full = ":" + term;
          term = term.toLowerCase();

          if (term === "") {
            return Ember.RSVP.resolve(["smile", "smiley", "wink", "sunny", "blush"]);
          }

          if (translations[full]) {
            return Ember.RSVP.resolve([translations[full]]);
          }

          var options = [];
          var i;
          for (i=0; i < emoji.length; i++) {
            if (emoji[i].indexOf(term) === 0) {
              options.push(emoji[i]);
              if(options.length > 4) { break; }
            }
          }

          if (options.length <= 4) {
            for (i=0; i < emoji.length; i++) {
              if (emoji[i].indexOf(term) > 0) {
                options.push(emoji[i]);
                if(options.length > 4) { break; }
              }
            }
          }

          return Ember.RSVP.resolve(options);
        }
      });
    });
  }

  Discourse.Markdown.whiteListTag('img', 'class', 'emoji');
}).call(this);