(function (factory) {
	if (typeof define === 'function' && define.amd) {
		// AMD
		define('condo-abstract-md5', ['jquery', 'condo-broadcaster'], factory);
	} else {
		// Browser global
		factory(jQuery);
	}
}(function ($, uploads, undefined) {
	'use strict';
	
	angular.module('CondoAbstractMd5', ['CondoBroadcaster'])
		.factory('Condo.Md5', ['$rootScope', '$q', 'Condo.Broadcast', function($rootScope, $q, broadcaster) {
		
		var hasher,
			queue = [],
			ready = false,
			processing = undefined,
			
			//
			// Resolves the hashing promise
			//
			recievedMessage = function(e) {
				if(e.data.success) {
					processing.result.resolve(e.data.result);
				} else {
					processing.result.reject(e.data.result);
				}
				
				processing = undefined;
				processNext();
				
				if(!$rootScope.$$phase) {
					$rootScope.$apply();					// This triggers the promise response
				}
			},
			
			//
			// starts processing the next item if the queue is not empty
			//
			processNext = function() {
				if(ready && processing === undefined && queue.length > 0) {
					processing = queue.pop();
					hasher.postMessage(processing.blob);
				}
			};
		
		
		if(!!window.Worker) {
			hasher = new Worker('<%= asset_path("condo/md5/hash.worker.js") %>');
			hasher.onmessage = recievedMessage;
			hasher.onerror = function(e) {
				ready = false;
				broadcaster.broadcast('coComponentLoadFailed', ['MD5', 'file fingerprinting']);		// Critical error
			};
			ready = true;
		} else {
			$.getScript('<%= asset_path("condo/md5/hash.worker.emulator.js") %>', function() {
				hasher = new CondoHashWorkerEmulator(recievedMessage);
				ready = true;
				processNext();	// It is possible
			}).fail(function(jqxhr, settings, exception) {
				broadcaster.broadcast('coComponentLoadFailed', ['MD5', 'file fingerprinting']);
			});
		}
		
		
		
		return {
			//
			// Will queue a start message and return the hash result
			//
			hash: function(blob) {
				var result = $q.defer();
					
				queue.push({
					blob: blob,
					result: result
				});
				processNext();
				
				return result.promise;
			}
		};
	}]);
}));