/**
 * @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 '../../shared/gr-avatar/gr-avatar.js';
import '../../shared/gr-date-formatter/gr-date-formatter.js';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface.js';
import '../../../styles/gr-form-styles.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-account-info_html.js';

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

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

  static get properties() {
    return {
      usernameMutable: {
        type: Boolean,
        notify: true,
        computed: '_computeUsernameMutable(_serverConfig, _account.username)',
      },
      nameMutable: {
        type: Boolean,
        notify: true,
        computed: '_computeNameMutable(_serverConfig)',
      },
      hasUnsavedChanges: {
        type: Boolean,
        notify: true,
        computed: '_computeHasUnsavedChanges(_hasNameChange, ' +
          '_hasUsernameChange, _hasStatusChange, _hasDisplayNameChange)',
      },

      _hasNameChange: Boolean,
      _hasUsernameChange: Boolean,
      _hasDisplayNameChange: Boolean,
      _hasStatusChange: Boolean,
      _loading: {
        type: Boolean,
        value: false,
      },
      _saving: {
        type: Boolean,
        value: false,
      },
      /** @type {?} */
      _account: Object,
      _serverConfig: Object,
      _username: {
        type: String,
        observer: '_usernameChanged',
      },
      _avatarChangeUrl: {
        type: String,
        value: '',
      },
    };
  }

  static get observers() {
    return [
      '_nameChanged(_account.name)',
      '_statusChanged(_account.status)',
      '_displayNameChanged(_account.display_name)',
    ];
  }

  loadData() {
    const promises = [];

    this._loading = true;

    promises.push(this.$.restAPI.getConfig().then(config => {
      this._serverConfig = config;
    }));

    promises.push(this.$.restAPI.getAccount().then(account => {
      this._hasNameChange = false;
      this._hasUsernameChange = false;
      this._hasDisplayNameChange = false;
      this._hasStatusChange = false;
      // Provide predefined value for username to trigger computation of
      // username mutability.
      account.username = account.username || '';
      this._account = account;
      this._username = account.username;
    }));

    promises.push(this.$.restAPI.getAvatarChangeUrl().then(url => {
      this._avatarChangeUrl = url;
    }));

    return Promise.all(promises).then(() => {
      this._loading = false;
    });
  }

  save() {
    if (!this.hasUnsavedChanges) {
      return Promise.resolve();
    }

    this._saving = true;
    // Set only the fields that have changed.
    // Must be done in sequence to avoid race conditions (@see Issue 5721)
    return this._maybeSetName()
        .then(() => this._maybeSetUsername())
        .then(() => this._maybeSetDisplayName())
        .then(() => this._maybeSetStatus())
        .then(() => {
          this._hasNameChange = false;
          this._hasDisplayNameChange = false;
          this._hasStatusChange = false;
          this._saving = false;
          this.dispatchEvent(new CustomEvent('account-detail-update', {
            composed: true, bubbles: true,
          }));
        });
  }

  _maybeSetName() {
    return this._hasNameChange && this.nameMutable ?
      this.$.restAPI.setAccountName(this._account.name) :
      Promise.resolve();
  }

  _maybeSetUsername() {
    return this._hasUsernameChange && this.usernameMutable ?
      this.$.restAPI.setAccountUsername(this._username) :
      Promise.resolve();
  }

  _maybeSetDisplayName() {
    return this._hasDisplayNameChange ?
      this.$.restAPI.setAccountDisplayName(this._account.display_name) :
      Promise.resolve();
  }

  _maybeSetStatus() {
    return this._hasStatusChange ?
      this.$.restAPI.setAccountStatus(this._account.status) :
      Promise.resolve();
  }

  _computeHasUnsavedChanges(nameChanged, usernameChanged, statusChanged,
      displayNameChanged) {
    return nameChanged || usernameChanged || statusChanged
        || displayNameChanged;
  }

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

    // Username may not be changed once it is set.
    return config.auth.editable_account_fields.includes('USER_NAME') &&
        !username;
  }

  _computeNameMutable(config) {
    return config.auth.editable_account_fields.includes('FULL_NAME');
  }

  _statusChanged() {
    if (this._loading) { return; }
    this._hasStatusChange = true;
  }

  _displayNameChanged() {
    if (this._loading) { return; }
    this._hasDisplayNameChange = true;
  }

  _usernameChanged() {
    if (this._loading || !this._account) { return; }
    this._hasUsernameChange =
        (this._account.username || '') !== (this._username || '');
  }

  _nameChanged() {
    if (this._loading) { return; }
    this._hasNameChange = true;
  }

  _handleKeydown(e) {
    if (e.keyCode === 13) { // Enter
      e.stopPropagation();
      this.save();
    }
  }

  _hideAvatarChangeUrl(avatarChangeUrl) {
    if (!avatarChangeUrl) {
      return 'hide';
    }

    return '';
  }
}

customElements.define(GrAccountInfo.is, GrAccountInfo);