/**
 * @license
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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.
 */
(function(window) {
  'use strict';

  /**
   * GrChangeReplyInterface, provides a set of handy methods on reply dialog.
   */
  class GrChangeReplyInterface {
    constructor(plugin) {
      this.plugin = plugin;
      this._sharedApiEl = Plugin._sharedAPIElement;
    }

    get _el() {
      return this._sharedApiEl.getElement(
          this._sharedApiEl.Element.REPLY_DIALOG);
    }

    getLabelValue(label) {
      return this._el.getLabelValue(label);
    }

    setLabelValue(label, value) {
      this._el.setLabelValue(label, value);
    }

    send(opt_includeComments) {
      this._el.send(opt_includeComments);
    }

    addReplyTextChangedCallback(handler) {
      const hookApi = this.plugin.hook('reply-text');
      const registeredHandler = e => handler(e.detail.value);
      hookApi.onAttached(el => {
        if (!el.content) { return; }
        el.content.addEventListener('value-changed', registeredHandler);
      });
      hookApi.onDetached(el => {
        if (!el.content) { return; }
        el.content.removeEventListener('value-changed', registeredHandler);
      });
    }

    addLabelValuesChangedCallback(handler) {
      const hookApi = this.plugin.hook('reply-label-scores');
      const registeredHandler = e => handler(e.detail);
      hookApi.onAttached(el => {
        if (!el.content) { return; }
        el.content.addEventListener('labels-changed', registeredHandler);
      });

      hookApi.onDetached(el => {
        if (!el.content) { return; }
        el.content.removeEventListener('labels-changed', registeredHandler);
      });
    }

    showMessage(message) {
      return this._el.setPluginMessage(message);
    }
  }

  window.GrChangeReplyInterface = GrChangeReplyInterface;
})(window);