/*
     Queue Plug-in

     Features:
          *Adds a cancelQueue() method for cancelling the entire queue.
          *All queued files are uploaded when startUpload() is called.
          *If false is returned from uploadComplete then the queue upload is stopped.
           If false is not returned (strict comparison) then the queue upload is continued.
          *Adds a QueueComplete event that is fired when all the queued files have finished uploading.
           Set the event handler with the queue_complete_handler setting.

     */

var SWFUpload;
if (typeof(SWFUpload) === "function") {
     SWFUpload.queue = {};

     SWFUpload.prototype.initSettings = (function (oldInitSettings) {
          return function () {
               if (typeof(oldInitSettings) === "function") {
                    oldInitSettings.call(this);
               }

               this.queueSettings = {};

               this.queueSettings.queue_cancelled_flag = false;
               this.queueSettings.queue_upload_count = 0;

               this.queueSettings.user_upload_complete_handler = this.settings.upload_complete_handler;
               this.queueSettings.user_upload_start_handler = this.settings.upload_start_handler;
               this.settings.upload_complete_handler = SWFUpload.queue.uploadCompleteHandler;
               this.settings.upload_start_handler = SWFUpload.queue.uploadStartHandler;

               this.settings.queue_complete_handler = this.settings.queue_complete_handler || null;
          };
     })(SWFUpload.prototype.initSettings);

     SWFUpload.prototype.startUpload = function (fileID) {
          this.queueSettings.queue_cancelled_flag = false;
          this.callFlash("StartUpload", [fileID]);
     };

     SWFUpload.prototype.cancelQueue = function () {
          this.queueSettings.queue_cancelled_flag = true;
          this.stopUpload();

          var stats = this.getStats();
          while (stats.files_queued > 0) {
               this.cancelUpload();
               stats = this.getStats();
          }
     };

     SWFUpload.queue.uploadStartHandler = function (file) {
          var returnValue;
          if (typeof(this.queueSettings.user_upload_start_handler) === "function") {
               returnValue = this.queueSettings.user_upload_start_handler.call(this, file);
          }

          // To prevent upload a real "FALSE" value must be returned, otherwise default to a real "TRUE" value.
          returnValue = (returnValue === false) ? false : true;

          this.queueSettings.queue_cancelled_flag = !returnValue;

          return returnValue;
     };

     SWFUpload.queue.uploadCompleteHandler = function (file) {
          var user_upload_complete_handler = this.queueSettings.user_upload_complete_handler;
          var continueUpload;

          if (file.filestatus === SWFUpload.FILE_STATUS.COMPLETE) {
               this.queueSettings.queue_upload_count++;
          }

          if (typeof(user_upload_complete_handler) === "function") {
               continueUpload = (user_upload_complete_handler.call(this, file) === false) ? false : true;
          } else if (file.filestatus === SWFUpload.FILE_STATUS.QUEUED) {
               // If the file was stopped and re-queued don't restart the upload
               continueUpload = false;
          } else {
               continueUpload = true;
          }

          if (continueUpload) {
               var stats = this.getStats();
               if (stats.files_queued > 0 && this.queueSettings.queue_cancelled_flag === false) {
                    this.startUpload();
               } else if (this.queueSettings.queue_cancelled_flag === false) {
                    this.queueEvent("queue_complete_handler", [this.queueSettings.queue_upload_count]);
                    this.queueSettings.queue_upload_count = 0;
               } else {
                    this.queueSettings.queue_cancelled_flag = false;
                    this.queueSettings.queue_upload_count = 0;
               }
          }
     };
}