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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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// TODO: Add support for using sizzle to locate elements
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goog.provide('bot.locators.css');
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goog.require('bot.Error');
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goog.require('bot.ErrorCode');
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goog.require('bot.userAgent');
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goog.require('goog.dom.NodeType');
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goog.require('goog.string');
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goog.require('goog.userAgent');
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/**
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 * Find an element by using a CSS selector
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 *
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 * @param {string} target The selector to search for.
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 * @param {!(Document|Element)} root The document or element to perform the
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 *     search under.
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 * @return {Element} The first matching element found in the DOM, or null if no
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 *     such element could be found.
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 */
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bot.locators.css.single = function (target, root) {
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  if (!goog.isFunction(root['querySelector']) &&
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    // IE8 in non-compatibility mode reports querySelector as an object.
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    goog.userAgent.IE && bot.userAgent.isEngineVersion(8) &&
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    !goog.isObject(root['querySelector'])) {
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    throw Error('CSS selection is not supported');
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  }
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  if (!target) {
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    throw new bot.Error(bot.ErrorCode.INVALID_SELECTOR_ERROR,
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      'No selector specified');
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  }
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  target = goog.string.trim(target);
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  var element;
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  try {
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    element = root.querySelector(target);
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  } catch (e) {
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    throw new bot.Error(bot.ErrorCode.INVALID_SELECTOR_ERROR,
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      'An invalid or illegal selector was specified');
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  }
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  return element && element.nodeType == goog.dom.NodeType.ELEMENT ?
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      /**@type {Element}*/ (element) : null;
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};
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/**
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 * Find all elements matching a CSS selector.
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 *
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 * @param {string} target The selector to search for.
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 * @param {!(Document|Element)} root The document or element to perform the
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 *     search under.
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 * @return {!IArrayLike} All matching elements, or an empty list.
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 */
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bot.locators.css.many = function (target, root) {
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  if (!goog.isFunction(root['querySelectorAll']) &&
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    // IE8 in non-compatibility mode reports querySelector as an object.
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    goog.userAgent.IE && bot.userAgent.isEngineVersion(8) &&
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    !goog.isObject(root['querySelector'])) {
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    throw Error('CSS selection is not supported');
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  }
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  if (!target) {
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    throw new bot.Error(bot.ErrorCode.INVALID_SELECTOR_ERROR,
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      'No selector specified');
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  }
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  target = goog.string.trim(target);
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  try {
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    return root.querySelectorAll(target);
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  } catch (e) {
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    throw new bot.Error(bot.ErrorCode.INVALID_SELECTOR_ERROR,
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      'An invalid or illegal selector was specified');
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  }
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};
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