import { h, Component } from '/js/web_modules/preact.js';

import htm from '/js/web_modules/htm.js';

const html = htm.bind(h);

export default class TabBar extends Component {
  constructor(props) {
    super(props);
    this.state = {
      activeIndex: 0,
    };

    this.handleTabClick = this.handleTabClick.bind(this);
  }

  handleTabClick(index) {
    this.setState({ activeIndex: index });
  }

  render() {
    const { tabs, ariaLabel } = this.props;
    if (!tabs.length) {
      return null;
    }

    if (tabs.length === 1) {
      return html`
        ${tabs[0].content}
      `;

    } else {
      return html`
        <div class="tab-bar">
          <div role="tablist" aria-label=${ariaLabel}>
            ${
              tabs.map((tabItem, index) => {
                const handleClick = () => this.handleTabClick(index);
                return html`
                  <button
                    role="tab"
                    aria-selected=${index === this.state.activeIndex}
                    aria-controls=${`tabContent${index}`}
                    id=${`tab-${tabItem.label}`}
                    onclick=${handleClick}
                  >${tabItem.label}</button>
                `;
              })
            }
          </div>
          ${
            tabs.map((tabItem, index) => {
              return html`
                  <div
                    tabindex="0"
                    role="tabpanel"
                    id=${`tabContent${index}`}
                    aria-labelledby=${`tab-${tabItem.label}`}
                    hidden=${index !== this.state.activeIndex}
                  >
                    ${tabItem.content}
                  </div>
              `;
            })
          }
        </div>
      `;
    }
  }
}