ging/social_stream

////////////////////
//Social Stream Presence: Parser module
////////////////////

PRESENCE.PARSER = (function(P,$,undefined){

    ////////////////////
    //Hash table
    ////////////////////
    var chatIcons = new Array();
    chatIcons[':)'] = "face-smile.png";
    chatIcons[':('] = "face-sad.png";
    chatIcons['(B)'] = "beer.png";
    chatIcons['(C)'] = "clock.png";
    chatIcons['(P)'] = "present.png";
    chatIcons[':P']= "face-raspberry.png";
    chatIcons[':Z']= "face-tired.png";
    chatIcons['(R)']= "rain.png";
    chatIcons['(S)']= "sun.png";
    chatIcons[';)']= "face-wink.png";

  var init = function(){ }


    ///////////////////////////////////////////////////////
    // Parser functions
    // Allow new features in chat msg like links, images, emoticons, ...
    ///////////////////////////////////////////////////////
    
    //Patterns
    var html_tag_pattern=/.*\<[^>]+>.*/g
    var simple_word_pattern=/^[aA-zZ0-9]+$/g
    var http_urls_pattern=/(http(s)?:\/\/)([aA-zZ0-9%=_&+?])+([./-][aA-zZ0-9%=_&+?]+)*[/]?/g
    var www_urls_pattern = /(www[.])([aA-zZ0-9%=_&+?])+([./-][aA-zZ0-9%=_&+?]+)*[/]?/g
    var icons_a_pattern=/\([A-Z]\)/g
    var icons_b_pattern=/((:|;)([()A-Z]))/g
    var youtube_video_pattern=/(http(s)?:\/\/)?(((youtu.be\/)([aA-zZ0-9]+))|((www.youtube.com\/watch\?v=)([aA-z0-9Z&=.])+))/g
    
    
    function getParsedContent(content,fromUser){
      if (fromUser){
       var chatTextclass = "ownChatText"
      } else {
       var chatTextclass = "guestChatText"
      }
      return ("<span class=\"" + chatTextclass + "\">" + parseContent(content) +  "</span>");
    }
    
    
    function parseContent(content){
      
      if (content.match(html_tag_pattern)!=null){
        content = content.replace(/>/g, "&gt;");
        content = content.replace(/</g, "&lt;");
        return "<pre>" + content + "</pre>"
      }
      
      var words = content.split(" ");
      for(i=0; i<words.length; i++){
        words[i] = parseWord(words[i]);
      }
    
      return words.join(" "); 
    }
    
    function parseWord(word){ 
      
      //Look for empty or simple words
      if ((word.trim()=="")||(word.match(simple_word_pattern)!=null)){
        return word
      }
    
      //Look for http urls
      var http_urls = word.match(http_urls_pattern)
      if (http_urls!=null){
        var url = http_urls[0]
        var type = getUrlType(url);
      
        switch(type){
          case "link":
            var link = buildUrlLink(url,url)
            var subwords = splitFirst(word,url)
            return parseWord(subwords[0]) + link + parseWord(subwords[1])
          case "image":
            var imageLink = buildImageLink(url);
            var subwords = splitFirst(word,url)
            return parseWord(subwords[0]) + imageLink + parseWord(subwords[1])
          case "video-youtube":
            var youtubeLink =  buildYoutubeVideoLink(url);
            var subwords = splitFirst(word,url)
            return parseWord(subwords[0]) + youtubeLink + parseWord(subwords[1])
          default:
            return word
        }
      }
      
    
      //Look for www urls
      var www_urls = word.match(www_urls_pattern)
      if (www_urls!=null){
        var url = www_urls[0]
        var type = getUrlType(url);
    
        switch(type){
        case "link":
          var link = buildUrlLink("http://" + url,url)
          var subwords = splitFirst(word,url)
          return parseWord(subwords[0]) + link + parseWord(subwords[1])
        case "image": 
          var imageLink = buildImageLink("http://" + url);
          var subwords = splitFirst(word,url)
          return parseWord(subwords[0]) + imageLink + parseWord(subwords[1])
        case "video-youtube":
            var youtubeLink =  buildYoutubeVideoLink("http://" + url);
            var subwords = splitFirst(word,url)
            return parseWord(subwords[0]) + youtubeLink + parseWord(subwords[1])
        default:
          return word
        }  
      }
    
      //Look for icons: Regex
      var icons_a = word.match(icons_a_pattern)
      if(icons_a!=null){
        for(g=0; g<icons_a.length; g++){
            word = word.replace(buildRegex(icons_a[g]), buildIconImage(icons_a[g]))
        }
      }
    
      var icons_b = word.match(icons_b_pattern)
      if(icons_b!=null){
        for(h=0; h<icons_b.length; h++){
            word = word.replace(buildRegex(icons_b[h]), buildIconImage(icons_b[h]))
        }
      }
      
      
      //No special content detected (maybe emoticons but not special pattern like urls)
      return word
    }
    
    function splitFirst(word,key){
        var split=[]  
        var cut = word.split(key);   
        split[0]=cut[0]
        cut.shift()
        var paste = cut.join(key)
        split[1]=paste
        return split
    }
    
    function buildIconImage(icon){
      if (icon in chatIcons){
        var image_file = chatIcons[icon]
        return "<img class=\"chatEmoticon\" src=\"/assets/emoticons/" + image_file + "\"/>";
      }
      return icon
    }
    
    function buildUrlLink(url,name){
      return "<a target=\"_blank\" class=\"chatLink\" href=\"" + url + "\">" + name + "</a>";
    }
    
    function buildImageLink(url){
      return "<a target=\"_blank\" class=\"chatImageLink\" href=\"" + url + "\">" + "<img class=\"chatImage\" src=\"" + url + "\"/>" + "</a>";
    }
    
    function buildYoutubeVideoLink(url){
      //Get youtube video id
      var youtube_video_id=url.split(/v\/|v=|youtu\.be\//)[1].split(/[?&]/)[0];
      var youtube_api_url = "http://gdata.youtube.com/feeds/api/videos/" + youtube_video_id
    
      //Get info from the video
      $.ajax({
            type: "GET",
            url: youtube_api_url,
            cache: false,
            dataType:'jsonp',
            success: function(data){
              var url_name = url;
              var youtube_video_thumbnail = "";
              
              //Video title
              var video_title = $(data).find("media\\:title")
              if (video_title.length > 0) {
               //url_name = url + " (" + $(video_title).text() + ")";
               url_name = $(video_title).text()
              }
              
              //Thumbnails
              var thumbnails = $(data).find("media\\:thumbnail")
              if (thumbnails.length>0){
                var thumbnail_url = $(thumbnails[0]).attr("url")
                if (thumbnail_url!=null){
                  youtube_video_thumbnail = "<p><img class=\"chatVideoImage\" src=\"" + thumbnail_url + "\"/></p>";
                } 
              }
              
               //Replace video link
               $("a[youtube_id=" + youtube_video_id + "]").html(buildUrlLink(url,url_name)+youtube_video_thumbnail);
          },
            error: function(xOptions, textStatus){
              //Handle errors
            }
       });
    
      return "<a target=\"_blank\" youtube_id=\"" + youtube_video_id + "\" class=\"chatLink\" href=\"" + url + "\">" + url + "</a>";
    }
    
    function buildRegex(word){
      word = word.replace(")","\\)")
      word = word.replace("(","\\(")
      var pattern = "(" + word + ")";
      pattern = buildPattern(pattern)
      return (new RegExp(pattern,'g'));
    }
    
    function buildPattern(pattern){
      //Escape pattern special characters
      pattern = pattern.replace("+","\\+")
      pattern = pattern.replace("?","\\?")
      return pattern
    }
    
    
    function getUrlType(url){
    
      if (url.match(youtube_video_pattern)!=null){
        return  "video-youtube"
      }
    
      var urlArray = url.split(".");
      if (urlArray!=null && urlArray.length>0){
        var extension= urlArray[urlArray.length-1]
      } else {
        var extension = null;
      }
    
      switch(extension){
        case "jpg":
          return "image"
          break;
        case "png":
          return "image"
          break;
        case "gif":
          return "image"
          break;
        default:
          return "link"
      }
    }
    
    
    ///////////////////////////////////////////////////////
    // Parsing user titles
    ///////////////////////////////////////////////////////
    
    function getParsedName(name, fromUser){
      if (fromUser){
       var chatTextclass = "ownName"
      } else {
       var chatTextclass = "guestName"
      }
      return ("<span class=\"" + chatTextclass + "\">" + name +  "</span>");
    }


  return {
    init: init,
        getParsedContent : getParsedContent,
        getParsedName : getParsedName
  };

}) (PRESENCE, jQuery);