/**
 * @license
 * Copyright (C) 2015 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 '../../../styles/shared-styles.js';
import '../gr-js-api-interface/gr-js-api-interface.js';
import '../gr-rest-api-interface/gr-rest-api-interface.js';
import {mixinBehaviors} from '@polymer/polymer/lib/legacy/class.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-avatar_html.js';
import {BaseUrlBehavior} from '../../../behaviors/base-url-behavior/base-url-behavior.js';
import {pluginLoader} from '../gr-js-api-interface/gr-plugin-loader.js';

/**
 * @extends PolymerElement
 */
class GrAvatar extends mixinBehaviors( [
  BaseUrlBehavior,
], GestureEventListeners(
    LegacyElementMixin(
        PolymerElement))) {
  static get template() { return htmlTemplate; }

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

  static get properties() {
    return {
      account: {
        type: Object,
        observer: '_accountChanged',
      },
      imageSize: {
        type: Number,
        value: 16,
      },
      _hasAvatars: {
        type: Boolean,
        value: false,
      },
    };
  }

  /** @override */
  attached() {
    super.attached();
    Promise.all([
      this._getConfig(),
      pluginLoader.awaitPluginsLoaded(),
    ]).then(([cfg]) => {
      this._hasAvatars = !!(cfg && cfg.plugin && cfg.plugin.has_avatars);

      this._updateAvatarURL();
    });
  }

  _getConfig() {
    return this.$.restAPI.getConfig();
  }

  _accountChanged(account) {
    this._updateAvatarURL();
  }

  _updateAvatarURL() {
    if (!this._hasAvatars || !this.account) {
      this.hidden = true;
      return;
    }
    this.hidden = false;

    const url = this._buildAvatarURL(this.account);
    if (url) {
      this.style.backgroundImage = 'url("' + url + '")';
    }
  }

  _getAccounts(account) {
    return account._account_id || account.email || account.username ||
        account.name;
  }

  _buildAvatarURL(account) {
    if (!account) { return ''; }
    const avatars = account.avatars || [];
    for (let i = 0; i < avatars.length; i++) {
      if (avatars[i].height === this.imageSize) {
        return avatars[i].url;
      }
    }
    return this.getBaseUrl() + '/accounts/' +
      encodeURIComponent(this._getAccounts(account)) +
      '/avatar?s=' + this.imageSize;
  }
}

customElements.define(GrAvatar.is, GrAvatar);