// Copyright 2021 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as ComponentHelpers from '../../components/helpers/helpers.js';
import * as LitHtml from '../../lit-html/lit-html.js';
import expandableListStyles from './expandableList.css.js';

export interface ExpandableListData {
  rows: LitHtml.TemplateResult[];
}

export class ExpandableList extends HTMLElement {
  static readonly litTagName = LitHtml.literal`devtools-expandable-list`;

  readonly #shadow = this.attachShadow({mode: 'open'});
  #expanded = false;
  #rows: LitHtml.TemplateResult[] = [];

  set data(data: ExpandableListData) {
    this.#rows = data.rows;
    this.render();
  }

  private onArrowClick(): void {
    this.#expanded = !this.#expanded;
    this.render();
  }

  connectedCallback(): void {
    this.#shadow.adoptedStyleSheets = [expandableListStyles];
  }

  private render(): void {
    if (this.#rows.length < 1) {
      return;
    }

    // Disabled until https://crbug.com/1079231 is fixed.
    // clang-format off
    LitHtml.render(
        LitHtml.html`
      <div class="expandable-list-container">
        <div>
          ${this.#rows.length > 1 ?
            LitHtml.html`
              <button @click=${(): void => this.onArrowClick()} class="arrow-icon-button">
                <span class="arrow-icon ${this.#expanded ? 'expanded' : ''}"></span>
              </button>
            `
          : LitHtml.nothing}
        </div>
        <div class="expandable-list-items">
          ${this.#rows.filter((_, index) => (this.#expanded || index === 0)).map(row => LitHtml.html`
            ${row}
          `)}
        </div>
      </div>
    `,
        this.#shadow, {host: this});
    // clang-format on
  }
}

ComponentHelpers.CustomElements.defineComponent('devtools-expandable-list', ExpandableList);

declare global {
  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  interface HTMLElementTagNameMap {
    'devtools-expandable-list': ExpandableList;
  }
}