/**
 * @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 '../../shared/gr-dropdown/gr-dropdown';
import '../../shared/gr-avatar/gr-avatar';
import {getUserName} from '../../../utils/display-name-util';
import {AccountInfo, ServerInfo} from '../../../types/common';
import {appContext} from '../../../services/app-context';
import {fireEvent} from '../../../utils/event-util';
import {
  DropdownContent,
  DropdownLink,
} from '../../shared/gr-dropdown/gr-dropdown';
import {sharedStyles} from '../../../styles/shared-styles';
import {LitElement, css, html} from 'lit';
import {customElement, property} from 'lit/decorators';

const INTERPOLATE_URL_PATTERN = /\${([\w]+)}/g;

declare global {
  interface HTMLElementTagNameMap {
    'gr-account-dropdown': GrAccountDropdown;
  }
}

@customElement('gr-account-dropdown')
export class GrAccountDropdown extends LitElement {
  @property({type: Object})
  account?: AccountInfo;

  @property({type: Object})
  config?: ServerInfo;

  @property({type: String})
  _path = '/';

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

  @property({type: String})
  _switchAccountUrl = '';

  private readonly restApiService = appContext.restApiService;

  override connectedCallback() {
    super.connectedCallback();
    this.handleLocationChange();
    window.addEventListener('location-change', this.handleLocationChange);
    this.restApiService.getConfig().then(cfg => {
      this.config = cfg;

      if (cfg && cfg.auth && cfg.auth.switch_account_url) {
        this._switchAccountUrl = cfg.auth.switch_account_url;
      } else {
        this._switchAccountUrl = '';
      }
      this._hasAvatars = !!(cfg && cfg.plugin && cfg.plugin.has_avatars);
    });
  }

  override disconnectedCallback() {
    window.removeEventListener('location-change', this.handleLocationChange);
    super.disconnectedCallback();
  }

  static override get styles() {
    return [
      sharedStyles,
      css`
        gr-dropdown {
          padding: 0 var(--spacing-m);
        }
        gr-avatar {
          height: 2em;
          width: 2em;
          vertical-align: middle;
        }
      `,
    ];
  }

  override render() {
    // To pass CSS mixins for @apply to Polymer components, they need to appear
    // in <style> inside the template.
    const customStyle = html`
      <style>
        gr-dropdown {
          --gr-button: {
            color: var(--header-text-color);
          }
          --gr-dropdown-item: {
            color: var(--primary-text-color);
          }
        }
      </style>
    `;
    return html`${customStyle}
      <gr-dropdown
        link=""
        .items="${this.links}"
        .topContent="${this.topContent}"
        @tap-item-shortcuts=${this._handleShortcutsTap}
        .horizontalAlign=${'right'}
      >
        <span ?hidden="${this._hasAvatars}"
          >${this._accountName(this.account)}</span
        >
        <gr-avatar
          .account="${this.account}"
          ?hidden=${!this._hasAvatars}
          .imageSize=${56}
          aria-label="Account avatar"
        ></gr-avatar>
      </gr-dropdown>`;
  }

  get links(): DropdownLink[] | undefined {
    return this._getLinks(this._switchAccountUrl, this._path);
  }

  get topContent(): DropdownContent[] | undefined {
    return this._getTopContent(this.account);
  }

  _getLinks(switchAccountUrl?: string, path?: string) {
    // Polymer 2: check for undefined
    if (switchAccountUrl === undefined || path === undefined) {
      return undefined;
    }

    const links: DropdownLink[] = [];
    links.push({name: 'Settings', url: '/settings/'});
    links.push({name: 'Keyboard Shortcuts', id: 'shortcuts'});
    if (switchAccountUrl) {
      const replacements = {path};
      const url = this._interpolateUrl(switchAccountUrl, replacements);
      links.push({name: 'Switch account', url, external: true});
    }
    links.push({name: 'Sign out', url: '/logout'});
    return links;
  }

  _getTopContent(account?: AccountInfo) {
    return [
      {text: this._accountName(account), bold: true},
      {text: account?.email ? account.email : ''},
    ] as DropdownContent[];
  }

  _handleShortcutsTap() {
    fireEvent(this, 'show-keyboard-shortcuts');
  }

  private readonly handleLocationChange = () => {
    this._path =
      window.location.pathname + window.location.search + window.location.hash;
  };

  _interpolateUrl(url: string, replacements: {[key: string]: string}) {
    return url.replace(
      INTERPOLATE_URL_PATTERN,
      (_, p1) => replacements[p1] || ''
    );
  }

  _accountName(account?: AccountInfo) {
    return getUserName(this.config, account);
  }
}