////////////////////
//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";

///////////////////////////////////////////////////////
// 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>"
  }
  
  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){
    split=[]  
    cut = word.split(key);   
    split[0]=cut[0]
    cut.shift()
    paste = cut.join(key)
    split[1]=paste
    return split
}

function buildIconImage(icon){
  if (icon in chatIcons){
    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>");
}