////////////////////
//videochat Module
////////////////////

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

  var init = function(){
		checkVideocallFeature();
	}

	//Videochat variables
	var opentok_apiKey = '<%=SocialStream::Presence.opentok_api_key%>';
	
	//Correspondence between slugs and session ids
	var slugOfSession = new Array();
	//slugOfSession['session_id'] = "slug";
	
	////////////////////
	//Videochat button actions
	////////////////////
	var clickVideoChatButton = function(slug){
	  var videoBoxVisibility = PRESENCE.WINDOW.toggleVideoBoxForSlug(slug);
	
	  if (videoBoxVisibility) {
	    openVideoChatWindow(slug);
	  } else {
	    closeVideoChatWindow(slug);
	  }
	}
	
	var closeVideoChatWindow = function(slug){
	    //Show games button
	    $(PRESENCE.WINDOW.getChatBoxButtonForSlug(slug,"games")).show()
	    closeVideoSession(slug);
	    return;
	}
	
	//Single variable for all slugs.
	var reconnectAttemptsVideo = 1;
	
	var openVideoChatWindow = function(slug){
	  
	  //Hide games button
	  $(PRESENCE.WINDOW.getChatBoxButtonForSlug(slug,"games")).hide()
	    
	  if (slug in contactsInfo) {
	    var connectionStatus = contactsInfo[slug].videoChatStatus;
	  } else {
	    var connectionStatus = null;
	  }
	
	  if (TB.checkSystemRequirements() != TB.HAS_REQUIREMENTS) {
	    showNotificationOnVideoBox(slug,I18n.t('chat.videochat.requirements'));
	    if(connectionStatus!=null){
	      contactsInfo[slug].videoChatStatus = "disconnected";
	    }
	    return;
	  }
	    
	  if(! PRESENCE.XMPPClient.isUserConnected()){
	    showNotificationOnVideoBox(slug, I18n.t("chat.videochat.offline"));
	    if(connectionStatus!=null){
	      contactsInfo[slug].videoChatStatus = "disconnected";
	    }
	    return;
	  }
	
	  if(! PRESENCE.UIMANAGER.isSlugChatConnected(slug)){
	    showNotificationOnVideoBox(slug, I18n.t("chat.videochat.guestOffline", {name: PRESENCE.XMPPClient.getNameFromSlug(slug)}));
	    if(connectionStatus!=null){
	      contactsInfo[slug].videoChatStatus = "disconnected";
	    }
	    return;
	  }
	  
	  if(connectionStatus==null){
	    if(reconnectAttemptsVideo > 0){
	      reconnectAttemptsVideo--;
	      showNotificationOnVideoBox(slug,I18n.t('chat.videochat.connectingWait'));
	      setTimeout(function() { openVideoChatWindow(slug); }, 5000);
	    } else {
	      showNotificationOnVideoBox(slug,I18n.t('chat.videochat.unable'));
	    }
	    return;
	  } else {
	    reconnectAttemptsVideo = 1;
	  }
	  
	  if(connectionStatus!="disconnected"){
	    return;
	  }
	
	  //connectionStatus=="disconnected"
	  //Start negotiation
	  negotiateVideoChatSession(slug);
	}
	
	
	////////////////////
	//Session establishment
	////////////////////
	
	//VideoChat Session: Step 1
	var negotiateVideoChatSession = function(slug){
	  showNotificationOnVideoBox(slug,I18n.t('chat.videochat.negotiating'));
	  contactsInfo[slug].videoChatStatus="negotiating";
	  
	  if(contactsInfo[slug].version != null){
	    connectingVideoChatSession(slug);
	    return;
	  } else {
	    PRESENCE.XMPPClient.sendIQStanzaForRequestClientInfo(slug);
	  }
	}
	
	//VideoChat Session: Step 2
	var connectingVideoChatSession = function(slug){
	  if (contactsInfo[slug].version == PRESENCE.XMPPClient.getJavascriptXMPPClientName()) {
	    contactsInfo[slug].videoChatStatus="connecting";
	    showNotificationOnVideoBox(slug,I18n.t('chat.videochat.connecting'));
	    requestSessionIDAndTokenForVideoChat(slug);
	  } else {
	    showNotificationOnVideoBox(slug,I18n.t("chat.videochat.clientIssue", {name: PRESENCE.XMPPClient.getNameFromSlug(slug)}));
	    contactsInfo[slug].videoChatStatus="disconnected";
	  }
	}
	
	var requestSessionIDAndTokenForVideoChat  = function(slug){
	  $.post("/requestVideoChat.xml", { }, function(data){        
	    var session = $(data).find("session");
	    if (session.length == 1) {
	      if (($(session).find("id").length == 1) && (($(session).find("user_token").length == 1)) && (($(session).find("guest_token").length == 1))) {
	        contactsInfo[slug].session_id = $(session).find("id").text();
	        contactsInfo[slug].user_token = $(session).find("user_token").text();
	        contactsInfo[slug].guest_token = $(session).find("guest_token").text();
	        sendVideoChatRequestToUser(slug);
	        return;
	      }
	    }
	    showNotificationOnVideoBox(slug, I18n.t('chat.videochat.serverIssue'));
	    contactsInfo[slug].videoChatStatus="disconnected";
	  });
	}
	
	//VideoChat Session: Step 3
	var sendVideoChatRequestToUser = function(slug){
	  contactsInfo[slug].videoChatStatus="waiting";
	  showNotificationOnVideoBox(slug,I18n.t('chat.videochat.waiting'));
	  PRESENCE.XMPPClient.sendIQStanzaToRequestVideochat(slug);
	}
	
	//VideoChat Session: Step 4
	var receiveVideoChatResponseFromUser = function(slug,response){
	  
	  if(contactsInfo[slug].videoChatStatus!="waiting"){
	    return;
	  }
	  
	  if(response=="yes"){
	    showNotificationOnVideoBox(slug,I18n.t('chat.videochat.establishing'));
	    contactsInfo[slug].videoChatStatus="establishing";
	    initVideoCallWith(slug);
	  } else if (response=="no"){
	    showNotificationOnVideoBox(slug,I18n.t("chat.videochat.rejected", {name: PRESENCE.XMPPClient.getNameFromSlug(slug)}));
	    contactsInfo[slug].videoChatStatus="disconnected";
	  } else {
	    showNotificationOnVideoBox(slug,I18n.t("chat.videochat.rejectedBusy", {name: PRESENCE.XMPPClient.getNameFromSlug(slug)}));
	    contactsInfo[slug].videoChatStatus="disconnected";
	  }
	}
	
	//Cancelation received
	var receiveVideoChatCancelationFromUser = function(slug){
	  if(slug in contactsInfo){
	    if(contactsInfo[slug].videoChatStatus=="pending"){
	      showNotificationOnVideoBox(slug,I18n.t("chat.videochat.cancel", {name: PRESENCE.XMPPClient.getNameFromSlug(slug)}));
	      contactsInfo[slug].videoChatStatus="disconnected";
	    }
	  } else {
	    closeVideoSession(slug);
	  }
	}
	
	//VideoChat Session: Step 5
	var closeVideoSession = function(slug){
	  if(slug in contactsInfo){
	    var connectionStatus = contactsInfo[slug].videoChatStatus;
	    
	    if(connectionStatus=="connected"){
	      showNotificationOnVideoBox(slug,I18n.t('chat.videochat.disconnecting'));
	      //Close opentok session...
	      if(contactsInfo[slug].session.connected){
	        contactsInfo[slug].session.disconnect();
	      }
	      restoreChatBoxAfterVideoCall(slug);
	    } else if(connectionStatus=="waiting"){
	      PRESENCE.XMPPClient.sendIQStanzaToCancelVideochat(slug);
	    } else if(connectionStatus=="pending"){
	      PRESENCE.XMPPClient.sendIQStanzaToResponseVideochat(slug,"no");
	    }
	    contactsInfo[slug].videoChatStatus="disconnected";
	  }
	  
	  PRESENCE.WINDOW.toggleVideoBoxForSlug(slug,false);
	}
	
	
	
	/////////////
	// Videochat interface functions
	////////////
	var clientInfoReceivedTrigger = function(slug){
	  //Check for videochat request
	  if ((slug in contactsInfo)&&(contactsInfo[slug].videoChatStatus="negotiating")){
	    connectingVideoChatSession(slug);
	  }
	}
	
	var showNotificationOnVideoBox = function(slug,msg){
	  PRESENCE.WINDOW.setVideoBoxContent(slug,"<p class=\"video-info\"> " + msg +" </p>");
	}
	
	var updateInterfaceAfterVideoRequestReceived = function(slug){
	  
	  if (contactsInfo[slug].videoChatStatus!="disconnected"){
	    PRESENCE.XMPPClient.sendIQStanzaToResponseVideochat(slug,"busy");
	    return;
	  } else {
	    contactsInfo[slug].videoChatStatus="pending";
	  }
	  
	  //Show or create chatbox
	  PRESENCE.WINDOW.createBuddyChatBox(slug);
	  
	  var chatBox = PRESENCE.WINDOW.getChatBoxForSlug(slug);
	  
	  //Show invitation message
	  showInvitationInVideoBox(slug);
	  
	  //Show videobox
	  PRESENCE.WINDOW.toggleVideoBoxForSlug(slug,true);
	}
	
	var showInvitationInVideoBox = function(slug){
	  var title = "<p class=\"video-info\">" + I18n.t("chat.videochat.call", {name: PRESENCE.XMPPClient.getNameFromSlug(slug)}) + " </p>";
	  var msg = title + "<p class=\"video-request\"> <a class=\"videoChatButton\" slug=\""+slug+"\" value=\"yes\">" + I18n.t("chat.videochat.accept") + "</a> -" 
	  + " <a class=\"videoChatButton\" slug=\""+slug+"\" value=\"no\">" + I18n.t("chat.videochat.deny") + "</a> </p>";
	  PRESENCE.WINDOW.setVideoBoxContent(slug,msg);
	  setVideochatRequestButtonsFunction();
	}
	
	var setVideochatRequestButtonsFunction = function(){
	  $(".videoChatButton").click(function(event) { 
	    event.preventDefault();
	    var result = $(this).attr("value");
	    var slug = $(this).attr("slug");
	    PRESENCE.XMPPClient.sendIQStanzaToResponseVideochat(slug,result);
	    
	    if(result=="yes"){
	      showNotificationOnVideoBox(slug,I18n.t('chat.videochat.establishing'));
	      contactsInfo[slug].videoChatStatus="establishing";
	      initVideoCallWith(slug);
	    } else {
	      contactsInfo[slug].videoChatStatus="disconnected";
	      closeVideoSession(slug);
	    }
	  });
	}
	
	var togglePublisherDivOnVideoChat = function(slug){
	  var publisherDiv = PRESENCE.WINDOW.getPublisherVideoBoxForSlug(slug);
	  var chatBox = PRESENCE.WINDOW.getChatBoxForSlug(slug);
	  var videoBox = PRESENCE.WINDOW.getVideoBoxForSlug(slug);
	  
	  if((chatBox==null)||(videoBox==null)||(publisherDiv==null)){
	    return;
	  }
	  
	  var videoBoxVisibility = publisherDiv.css("z-index")!="-1";
	    
	  var desp = OPENTOK_PUBLISHER_HEIGHT + 1;
	  
	  var scrollHeight = $(chatBox)[0].scrollHeight;
	  var outerHeight = chatBox.outerHeight();
	  var diff = scrollHeight - chatBox.scrollTop() - outerHeight;
	  var scrollMov = 145;
	      
	  if (! videoBoxVisibility){
	    //Show publisher div
	    publisherDiv.css("z-index","100");
	    //Resize windows
	    chatBox.css("height",chatBox.height() - desp );
	    videoBox.css("height",videoBox.height() + desp );
	    chatBox.scrollTop(chatBox.scrollTop() + scrollMov);
	  } else {
	    //Hide publisher div
	    publisherDiv.css("z-index","-1");
	    //Resize windows
	    chatBox.css("height",chatBox.height() + desp );
	    videoBox.css("height",videoBox.height() - desp );
	    if(diff < desp){
	      chatBox.scrollTop(chatBox.scrollTop() - diff);
	    } else {
	      chatBox.scrollTop(chatBox.scrollTop() - scrollMov);
	    }
	  }
	}
	
	var restoreChatBoxAfterVideoCall = function(slug){
	  //Original dimensions
	  showNotificationOnVideoBox(slug,I18n.t('chat.videochat.disconnected'));
	  $(PRESENCE.WINDOW.getChatBoxButtonForSlug(slug,"videoChange")).find("span").hide();
	  PRESENCE.WINDOW.toggleVideoBoxForSlug(slug,false);
	  var chatBox = PRESENCE.WINDOW.getChatBoxForSlug(slug);
	  chatBox.height(PRESENCE.WINDOW.getChatBoxHeight());
	}
	
	var checkVideocallFeature = function(){
	  if (opentok_apiKey=="default"){
	    //Hide videochat buttons
	    
	    //Changing chat-videothick CSS class by JQuery
	    var ss = document.styleSheets;
	    for (var i=0; i<ss.length; i++) {
	        var rules = ss[i].cssRules || ss[i].rules;
	        if (rules != undefined){
	          for (var j=0; j<rules.length; j++) {
	              if (rules[j].selectorText === ".chat-videothick") {
	                  rules[j].style.display = 'none'
	              }
	          }
	        }
	    } 
	  }
	}
	
	var clickVideoChangeChatButton = function(slug){
	  togglePublisherDivOnVideoChat(slug);
	}

	
	////////////////
	/// Tokbox management
	////////////////
	var OPENTOK_PUBLISHER_WIDTH = 235;
	var OPENTOK_PUBLISHER_HEIGHT = 145;
	
	var OPENTOK_SUBSCRIBER_WIDTH = 235;
	var OPENTOK_SUBSCRIBER_HEIGHT = 145;
	
	var initVideoCallWith = function(slug){
	  if (TB.checkSystemRequirements() != TB.HAS_REQUIREMENTS) {
	    showNotificationOnVideoBox(slug,I18n.t('chat.videochat.requirements'));
	    contactsInfo[slug].videoChatStatus="disconnected";
	  } else {
	    //TB.setLogLevel(TB.DEBUG);
	    contactsInfo[slug].session = TB.initSession(contactsInfo[slug].session_id);
	    contactsInfo[slug].session.addEventListener('sessionConnected', PRESENCE.VIDEOCHAT.sessionConnectedHandler);
	    contactsInfo[slug].session.addEventListener('sessionDisconnected', PRESENCE.VIDEOCHAT.sessionDisconnectedHandler);
	    contactsInfo[slug].session.addEventListener('streamCreated', PRESENCE.VIDEOCHAT.streamCreatedHandler);
	    contactsInfo[slug].session.addEventListener('streamDestroyed', PRESENCE.VIDEOCHAT.streamDestroyedHandler);
	    contactsInfo[slug].session.connect(opentok_apiKey, contactsInfo[slug].user_token);
	    slugOfSession[contactsInfo[slug].session_id] = slug;
	  }
	}
	
	var sessionConnectedHandler = function(event) {
	  if (event.target.sessionId in slugOfSession){
	    var slug = slugOfSession[event.target.sessionId];
	    contactsInfo[slug].videoChatStatus="connected";
	    $(PRESENCE.WINDOW.getChatBoxButtonForSlug(slug,"videoChange")).find("span").show();
	    
	    //Create publishing div
	    var parentDiv = document.createElement('div');
	    var pubID = 'stream_publish_videochat_' + slug;
	    parentDiv.setAttribute('id', pubID);
	    parentDiv.setAttribute('class', 'stream_publish_videochat');
	    
	    var stubDiv = document.createElement("div");
	    stubDiv.id = "opentok_publisher&" + slug;
	    parentDiv.appendChild(stubDiv);
	    
	    //Interface update
	    PRESENCE.WINDOW.setVideoBoxContent(slug,parentDiv);
	    
	    //Publish
	    var publisherProps = {width: OPENTOK_PUBLISHER_WIDTH, height: OPENTOK_PUBLISHER_HEIGHT};
	    contactsInfo[slug].publisher = contactsInfo[slug].session.publish(stubDiv.id, publisherProps);
	    contactsInfo[slug].publisher.addEventListener('accessAllowed', accessAllowed);
	    
	    //Subscribe
	    subscribeToStreams(event.streams,slug);
	    
	    //Toggle!
	    togglePublisherDivOnVideoChat(slug);
	  } else {
	    //Close
	  }
	}   
	 
	var sessionDisconnectedHandler = function(event) {
	  // This signals that the user was disconnected from the Session. Any subscribers and publishers
	  // will automatically be removed. This default behaviour can be prevented using event.preventDefault()
	  
	  var slug = slugOfSession[event.target.sessionId];
	  contactsInfo[slug].publisher = null;
	  contactsInfo[slug].videoChatStatus="disconnected";
	}
	
	var streamCreatedHandler = function(event) {
	    var slug = slugOfSession[event.target.sessionId];
	    subscribeToStreams(event.streams,slug);
	}
	
	var streamDestroyedHandler = function(event) {
	      // This signals that a stream was destroyed. Any Subscribers will automatically be removed.
	      // This default behaviour can be prevented using event.preventDefault()
	      var slug = slugOfSession[event.target.sessionId];
	      closeVideoSession(slug);
	}
	 
	var subscribeToStreams = function(streams,slug) {
	  var session = contactsInfo[slug].session
	  
	  for (var i = 0; i < streams.length; i++) {
	
	    // Make sure we don't subscribe to ourself
	    if (streams[i].connection.connectionId == session.connection.connectionId) {
	      return;
	    }
	    
	    // Create subscriber div
	    var parentDiv = document.createElement('div');
	    parentDiv.setAttribute('class', 'stream_videochat');
	    
	    var stubDiv = document.createElement("div");
	    stubDiv.id = 'stream' + streams[i].streamId;
	    parentDiv.appendChild(stubDiv);
	    
	    PRESENCE.WINDOW.addVideoBoxContent(slug,parentDiv);
	                     
	    // Subscribe to the stream
	    var subscriberProps = { width: OPENTOK_SUBSCRIBER_WIDTH,
	                          height: OPENTOK_SUBSCRIBER_HEIGHT };
	    session.subscribe(streams[i], stubDiv.id, subscriberProps);
	  }
	}
	
	var accessAllowed = function(event){
	  var slug = event.target.replacedDivId.split("&")[1];
	  togglePublisherDivOnVideoChat(slug);
	}

  return {
    init: init,
		clickVideoChatButton : clickVideoChatButton,
		clientInfoReceivedTrigger : clientInfoReceivedTrigger,
		closeVideoSession : closeVideoSession,
		updateInterfaceAfterVideoRequestReceived : updateInterfaceAfterVideoRequestReceived,
		receiveVideoChatResponseFromUser : receiveVideoChatResponseFromUser,
		receiveVideoChatCancelationFromUser : receiveVideoChatCancelationFromUser,
		clickVideoChangeChatButton : clickVideoChangeChatButton,
		sessionConnectedHandler : sessionConnectedHandler,
		sessionDisconnectedHandler : sessionDisconnectedHandler,
		streamCreatedHandler : streamCreatedHandler,
		streamDestroyedHandler : streamDestroyedHandler
  };

}) (PRESENCE, jQuery);