/**
 * @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';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
import {PolymerElement} from '@polymer/polymer/polymer-element';
import {htmlTemplate} from './gr-avatar_html';
import {getBaseUrl} from '../../../utils/url-util';
import {getPluginLoader} from '../gr-js-api-interface/gr-plugin-loader';
import {customElement, property} from '@polymer/decorators';
import {AccountInfo} from '../../../types/common';
import {appContext} from '../../../services/app-context';

@customElement('gr-avatar')
export class GrAvatar extends GestureEventListeners(
  LegacyElementMixin(PolymerElement)
) {
  static get template() {
    return htmlTemplate;
  }

  @property({type: Object, observer: '_accountChanged'})
  account?: AccountInfo;

  @property({type: Number})
  imageSize = 16;

  @property({type: Boolean})
  _hasAvatars = false;

  private readonly restApiService = appContext.restApiService;

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

      this._updateAvatarURL();
    });
  }

  _getConfig() {
    return this.restApiService.getConfig();
  }

  _accountChanged() {
    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: AccountInfo) {
    return (
      account._account_id || account.email || account.username || account.name
    );
  }

  _buildAvatarURL(account: AccountInfo) {
    if (!account) {
      return '';
    }
    const avatars = account.avatars || [];
    // if there is no avatar url in account, there is no avatar set on server,
    // and request /avatar?s will be 404.
    if (avatars.length === 0) {
      return '';
    }
    for (let i = 0; i < avatars.length; i++) {
      if (avatars[i].height === this.imageSize) {
        return avatars[i].url;
      }
    }
    const accountID = this._getAccounts(account);
    if (!accountID) {
      return '';
    }
    return (
      `${getBaseUrl()}/accounts/` +
      encodeURIComponent(`${this._getAccounts(account)}`) +
      `/avatar?s=${this.imageSize}`
    );
  }
}

declare global {
  interface HTMLElementTagNameMap {
    'gr-avatar': GrAvatar;
  }
}