/**
 * @workInProgress
 * @ngdoc service
 * @name angular.service.$xhr.bulk
 * @requires $xhr
 * @requires $xhr.error
 * @requires $log
 *
 * @description
 *
 * @example
 */
angularServiceInject('$xhr.bulk', function($xhr, $error, $log){
  var requests = [],
      scope = this;
  function bulkXHR(method, url, post, callback) {
    if (isFunction(post)) {
      callback = post;
      post = _null;
    }
    var currentQueue;
    forEach(bulkXHR.urls, function(queue){
      if (isFunction(queue.match) ? queue.match(url) : queue.match.exec(url)) {
        currentQueue = queue;
      }
    });
    if (currentQueue) {
      if (!currentQueue.requests) currentQueue.requests = [];
      currentQueue.requests.push({method: method, url: url, data:post, callback:callback});
    } else {
      $xhr(method, url, post, callback);
    }
  }
  bulkXHR.urls = {};
  bulkXHR.flush = function(callback){
    forEach(bulkXHR.urls, function(queue, url){
      var currentRequests = queue.requests;
      if (currentRequests && currentRequests.length) {
        queue.requests = [];
        queue.callbacks = [];
        $xhr('POST', url, {requests:currentRequests}, function(code, response){
          forEach(response, function(response, i){
            try {
              if (response.status == 200) {
                (currentRequests[i].callback || noop)(response.status, response.response);
              } else {
                $error(currentRequests[i], response);
              }
            } catch(e) {
              $log.error(e);
            }
          });
          (callback || noop)();
        });
        scope.$eval();
      }
    });
  };
  this.$onEval(PRIORITY_LAST, bulkXHR.flush);
  return bulkXHR;
}, ['$xhr', '$xhr.error', '$log']);
