/*-
 * ============LICENSE_START=======================================================
 * ECOMP Policy Engine
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */

(function(window, angular) {
    'use strict';
    angular.module('abs').service('fileUploader', ['$http', '$q', 'fileManagerConfig', function ($http, $q, fileManagerConfig) {

        function deferredHandler(data, deferred, errorMessage) {
            if (!data || typeof data !== 'object') {
                return deferred.reject('Bridge response error, please check the docs');
            }
            if (data.result && data.result.error) {
                return deferred.reject(data);
            }
            if (data.error) {
                return deferred.reject(data);
            }
            if (errorMessage) {
                return deferred.reject(errorMessage);
            }
            deferred.resolve(data);
        }

        this.requesting = false; 
        this.upload = function(fileList, path) {
            if (! window.FormData) {
                throw new Error('Unsupported browser version');
            }
            var self = this;
            var form = new window.FormData();
            var deferred = $q.defer();
            form.append('destination', '/' + path.join('/'));

            for (var i = 0; i < fileList.length; i++) {
                var fileObj = fileList.item(i);
                fileObj instanceof window.File && form.append('file-' + i, fileObj);
            }

            self.requesting = true;
            $http.post(fileManagerConfig.uploadUrl, form, {
                transformRequest: angular.identity,
                headers: {
                    'Content-Type': undefined
                }
            }).success(function(data) {
                deferredHandler(data, deferred);
            }).error(function(data) {
                deferredHandler(data, deferred, 'Unknown error uploading files');
            })['finally'](function() {
                self.requesting = false;
            });

            return deferred.promise;
        };
    }]);
})(window, angular);