/**
 * @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.
 */
import '../../../scripts/bundled-polymer.js';

import '@polymer/iron-input/iron-input.js';
import '../../shared/gr-button/gr-button.js';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface.js';
import '../../../styles/shared-styles.js';
import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {htmlTemplate} from './gr-email-editor_html.js';

/** @extends Polymer.Element */
class GrEmailEditor extends GestureEventListeners(
    LegacyElementMixin(
        PolymerElement)) {
  static get template() { return htmlTemplate; }

  static get is() { return 'gr-email-editor'; }

  static get properties() {
    return {
      hasUnsavedChanges: {
        type: Boolean,
        notify: true,
        value: false,
      },

      _emails: Array,
      _emailsToRemove: {
        type: Array,
        value() { return []; },
      },
      /** @type {?string} */
      _newPreferred: {
        type: String,
        value: null,
      },
    };
  }

  loadData() {
    return this.$.restAPI.getAccountEmails().then(emails => {
      this._emails = emails;
    });
  }

  save() {
    const promises = [];

    for (const emailObj of this._emailsToRemove) {
      promises.push(this.$.restAPI.deleteAccountEmail(emailObj.email));
    }

    if (this._newPreferred) {
      promises.push(this.$.restAPI.setPreferredAccountEmail(
          this._newPreferred));
    }

    return Promise.all(promises).then(() => {
      this._emailsToRemove = [];
      this._newPreferred = null;
      this.hasUnsavedChanges = false;
    });
  }

  _handleDeleteButton(e) {
    const index = parseInt(dom(e).localTarget
        .getAttribute('data-index'), 10);
    const email = this._emails[index];
    this.push('_emailsToRemove', email);
    this.splice('_emails', index, 1);
    this.hasUnsavedChanges = true;
  }

  _handlePreferredControlClick(e) {
    if (e.target.classList.contains('preferredControl')) {
      e.target.firstElementChild.click();
    }
  }

  _handlePreferredChange(e) {
    const preferred = e.target.value;
    for (let i = 0; i < this._emails.length; i++) {
      if (preferred === this._emails[i].email) {
        this.set(['_emails', i, 'preferred'], true);
        this._newPreferred = preferred;
        this.hasUnsavedChanges = true;
      } else if (this._emails[i].preferred) {
        this.set(['_emails', i, 'preferred'], false);
      }
    }
  }
}

customElements.define(GrEmailEditor.is, GrEmailEditor);