/**
 * @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() {
  'use strict';

  Polymer({
    is: 'gr-registration-dialog',
    _legacyUndefinedCheck: true,

    /**
     * Fired when account details are changed.
     *
     * @event account-detail-update
     */

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

    properties: {
      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,
    },

    hostAttributes: {
      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.fire('account-detail-update');
      });
    },

    _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.fire('close');
    },

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

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

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

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