/**
 * Class to manage a queue of messages to show the user in a message bar
 */
cambrient.UserMessaging = function() {
   var MESSAGE_BAR_HEIGHT = 40;
   var MESSAGE_BAR_BGCOLOR = 'ffff00';

   var self;                              // pointer to instance of this class
   var mb;                                // the message bar div
   var messageQueue = new Array();
   var messageBarOpen = false;
   var tOpen, tClose;                     // tweening animations for open and close

   function constructorFn() {
      self = this;
      registerOnLoad(self.init);      
   }

   // initialize
   constructorFn.prototype.init = function() {
      mb = $('message_bar');

      if (mb) {
         mb.style.display = 'none';
         mb.style.visibility = 'hidden';
         mb.style.zIndex = 1000;
         
         mb.onclick = function(evt) {
            self.closeBar();
         }
   
         // define opening animation
         tOpen = new Tween(mb.style, 'height', Tween.strongEaseOut, 0, 40, 1, 'px');
         tOpen.onMotionFinished = function() {
            var tFade = new ColorTween(mb.style, 'backgroundColor', Tween.bounceEaseOut, 'ffffff', MESSAGE_BAR_BGCOLOR, 3);
            tFade.start();
         }
   
         // define closing animation
         tClose = new Tween(mb.style, 'height', Tween.strongEaseOut, MESSAGE_BAR_HEIGHT, 0, 1, 'px');
         tClose.onMotionFinished = function() {
            mb.style.display = 'none';
            mb.style.visibility = 'hidden';
         }
      }
      
      self.processMessageQueue();
   }

   // Routinely checks for messages in the message queue and displays them
   constructorFn.prototype.processMessageQueue = function() {
      if (!messageBarOpen) {
         if (messageQueue.length > 0) {
            var msg = messageQueue.shift();
            
            if (mb) {
               if (msg.type == 'error') {
                  MESSAGE_BAR_BGCOLOR = 'ff0000';
               } else {
                  MESSAGE_BAR_BGCOLOR = 'ffff00';
               }
   
               // redefine the color tween in case the background color changed
               tOpen.onMotionFinished = function() {
                  var tFade = new ColorTween(mb.style, 'backgroundColor', Tween.bounceEaseOut, 'ffffff', MESSAGE_BAR_BGCOLOR, 3);
                  tFade.start();
               }
               
               mb.innerHTML = msg.message;
               self.openBar();            
            } else {
               //alert("UNHANDLED MESSAGING" + msg.message);
               if(window.console) {
               	console.log("UNHANDLED MESSAGING " + msg.message);
               }
            }
         }
      }
      
      setTimeout(self.processMessageQueue, 1000);
   }
   
   // Close the message bar
   constructorFn.prototype.closeBar = function() {
      tOpen.stop(); // if it's still running
      messageBarOpen = false;
      tClose.start();
   }

   // Open the message bar
   constructorFn.prototype.openBar = function() {
      tClose.stop();
      messageBarOpen = true;
      mb.style.backgroundColor = MESSAGE_BAR_BGCOLOR;            
      mb.style.height = 0; //MESSAGE_BAR_HEIGHT;
      mb.style.display = 'block';
      mb.style.visibility = 'visible';
      tOpen.start();
   }

   // adds a message to the message queue
   constructorFn.prototype.addMessage = function(msg) {
      var hasMsg = false;
      
      messageQueue.each(function(item) {
         if (item.message != null && item.message == msg.message) {
            hasMsg = true;
         }
      });
            
      if (!hasMsg) {
         messageQueue.push(msg);
      }
   }

   // Display informational message to user
   constructorFn.prototype.info = function(msg) {
      self.addMessage({
         "message": msg,
         "type": "info"
      });
   }

   // Display error message to user
   constructorFn.prototype.error = function(msg) {
      self.addMessage({
         "message": msg,
         "type": "error"
      });
   }

   // Display error message to user
   constructorFn.prototype.warning = function(msg) {
      self.addMessage({
         "message": msg,
         "type": "warning"
      });
   }

   // Display error message to user
   constructorFn.prototype.confirm = function(msg) {
      console.log('ERROR: ' + msg);
      self.addMessage({
         "message": msg,
         "type": "confirm"
      });
   }

   // Display debug message to developer
   constructorFn.prototype.debug = function(msg) {
      self.addMessage({
         "message": msg,
         "type": "debug"
      });
   }

   constructorFn.prototype.test = function() {
      cambrient.userMessaging.info("Hello world!");
      cambrient.userMessaging.info("Hello world!");
      cambrient.userMessaging.info("Hello world!");
      cambrient.userMessaging.error("ERROR: There was an unknown error trying to parse the error for display. Just kidding!");
      cambrient.userMessaging.info("Hello world 2!");
      cambrient.userMessaging.info("Hello world 2!");
      cambrient.userMessaging.info("Hello world 2!");
   }

   return new constructorFn();
}

cambrient.userMessaging = new cambrient.UserMessaging();