/**
 * @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 '@polymer/iron-input/iron-input.js';
import '../../../styles/gr-form-styles.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 {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-registration-dialog_html.js';

/**
 * @extends PolymerElement
 */
class GrRegistrationDialog extends GestureEventListeners(
    LegacyElementMixin(PolymerElement)) {
  static get template() { return htmlTemplate; }

  static get is() { return 'gr-registration-dialog'; }
  /**
   * Fired when account details are changed.
   *
   * @event account-detail-update
   */

  /**
   * Fired when the close button is pressed.
   *
   * @event close
   */

  static get properties() {
    return {
      settingsUrl: String,
      /** @type {?} */
      _account: {
        type: Object,
        value: () => {
        // Prepopulate possibly undefined fields with values to trigger
        // computed bindings.
          return {email: null, name: null, username: null};
        },
      },
      _usernameMutable: {
        type: Boolean,
        computed: '_computeUsernameMutable(_serverConfig, _account.username)',
      },
      _loading: {
        type: Boolean,
        value: true,
        observer: '_loadingChanged',
      },
      _saving: {
        type: Boolean,
        value: false,
      },
      _serverConfig: Object,
    };
  }

  /** @override */
  ready() {
    super.ready();
    this._ensureAttribute('role', 'dialog');
  }

  loadData() {
    this._loading = true;

    const loadAccount = this.$.restAPI.getAccount().then(account => {
      // Using Object.assign here allows preservation of the default values
      // supplied in the value generating function of this._account, unless
      // they are overridden by properties in the account from the response.
      this._account = Object.assign({}, this._account, account);
    });

    const loadConfig = this.$.restAPI.getConfig().then(config => {
      this._serverConfig = config;
    });

    return Promise.all([loadAccount, loadConfig]).then(() => {
      this._loading = false;
    });
  }

  _save() {
    this._saving = true;
    const promises = [
      this.$.restAPI.setAccountName(this.$.name.value),
      this.$.restAPI.setPreferredAccountEmail(this.$.email.value || ''),
    ];

    if (this._usernameMutable) {
      promises.push(this.$.restAPI.setAccountUsername(this.$.username.value));
    }

    return Promise.all(promises).then(() => {
      this._saving = false;
      this.dispatchEvent(new CustomEvent('account-detail-update', {
        composed: true, bubbles: true,
      }));
    });
  }

  _handleSave(e) {
    e.preventDefault();
    this._save().then(this.close.bind(this));
  }

  _handleClose(e) {
    e.preventDefault();
    this.close();
  }

  close() {
    this._saving = true; // disable buttons indefinitely
    this.dispatchEvent(new CustomEvent('close', {
      composed: true, bubbles: true,
    }));
  }

  _computeSaveDisabled(name, email, saving) {
    return !name || !email || saving;
  }

  _computeUsernameMutable(config, username) {
    // Polymer 2: check for undefined
    if ([
      config,
      username,
    ].some(arg => arg === undefined)) {
      return undefined;
    }

    return config.auth.editable_account_fields.includes('USER_NAME') &&
        !username;
  }

  _computeUsernameClass(usernameMutable) {
    return usernameMutable ? '' : 'hide';
  }

  _loadingChanged() {
    this.classList.toggle('loading', this._loading);
  }
}

customElements.define(GrRegistrationDialog.is, GrRegistrationDialog);