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// Licensed to the Software Freedom Conservancy (SFC) under one
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// or more contributor license agreements.  See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership.  The SFC licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License.  You may obtain a copy of the License at
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//
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//   http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied.  See the License for the
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// specific language governing permissions and limitations
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// under the License.
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/** @fileoverview A XHR client. */
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goog.provide('webdriver.http.XhrClient');
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goog.require('goog.Promise');
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goog.require('goog.net.XmlHttp');
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goog.require('webdriver.http.Client');
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goog.require('webdriver.http.Response');
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/**
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 * A HTTP client that sends requests using XMLHttpRequests.
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 * @param {string} url URL for the WebDriver server to send commands to.
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 * @constructor
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 * @implements {webdriver.http.Client}
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 */
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webdriver.http.XhrClient = function(url) {
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  /** @private {string} */
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  this.url_ = url;
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};
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/** @override */
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webdriver.http.XhrClient.prototype.send = function(request) {
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  var url = this.url_ + request.path;
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  return new goog.Promise(function(fulfill, reject) {
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    var xhr = /** @type {!XMLHttpRequest} */ (goog.net.XmlHttp());
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    xhr.open(request.method, url, true);
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    xhr.onload = function() {
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      fulfill(webdriver.http.Response.fromXmlHttpRequest(xhr));
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    };
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    xhr.onerror = function() {
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      reject(Error([
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        'Unable to send request: ', request.method, ' ', url,
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        '\nOriginal request:\n', request
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      ].join('')));
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    };
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    for (var header in request.headers) {
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      xhr.setRequestHeader(header, request.headers[header] + '');
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    }
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    xhr.send(JSON.stringify(request.data));
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  });
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};
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