import { h, Component } from 'preact';

class WBAccordion extends Component {
  constructor(...args) {
    super(...args);
    this.setupIds();
    console.log('WBAccordion() : domId=' + this.state.domId);
  }

  setupIds() {
    this.state.domId = 'accordion-' + uuid.v4();
    const { names } = this.props;
    const { state  } = this;
    state.headerDomIds = names.map(() => ('accordion-' + uuid.v4()));
    state.collapseDomIds = names.map(() => ('accordion-' + uuid.v4()));
    state.isOpen = Array(names.length).fill(false);
    state.collapseElements = null;
  }

  setupEvents() {
    const { collapseDomIds, isOpen } = this.state;
    const accordion = this;
    const collapseElements = $(collapseDomIds.map(a => '#' + a).join(','));
    this.state.collapseElements = collapseElements;
    collapseElements.on('hidden.bs.collapse shown.bs.collapse', function(ev) {
      // console.log(this.id);
      const el = this;
      const idx = collapseDomIds.findIndex(a => (a === el.id));
      isOpen[idx] = (ev.type === 'shown');
      accordion.setState({ isOpen });
    });
  }

  removeEvents() {
    const { collapseElements } = this.state;
    collapseElements.off('hidden.bs.collapse shown.bs.collapse');
  }

  setup() {
    this.setupIds();
    this.setupEvents();
  }

  componentDidMount() {
    console.log('WBAccordion.componentDidMount()');
    this.setupEvents();
  }

  componentWillUnmount() {
    console.log('WBAccordion.componentWillUnmount()');
    this.removeEvents();
  }

  componentWillReceiveProps(nextProps) {
    console.log('WBAccordion.componentWillReceiveProps()');
    this.props = nextProps;
    this.removeEvents();
    this.setupIds();
    this.setState({}); // render
    this.setupEvents();
  }

  render({ children, names, cardHeaderClass }, { domId, headerDomIds, collapseDomIds, isOpen }) {
    return (
      <div class="accordion" id={ domId }>
        { children.map((_, i) => (
          <div class="card">
            <div class={ cardHeaderClass} id={ headerDomIds[i] }>
              <h2 class="mb-0">
                <button class="btn btn-link" type="button" data-toggle="collapse" data-target={ '#' + collapseDomIds[i] } aria-expanded={ isOpen[i] } aria-controls={ collapseDomIds[i] }>
                  { names[i] }
                </button>
              </h2>
            </div>

            <div id={ collapseDomIds[i] } class={ 'collapse' + (isOpen[i] ? ' show' : '') }
              aria-labelledby={ headerDomIds[i] } data-parent={ '#' + domId }>
              <div class="card-body">
                { children[i] }
              </div>
            </div>
          </div>
        )) }
      </div>
    );
  }
};

WBAccordion.defaultProps = {
  'cardHeaderClass': 'card-header'
};

export default WBAccordion;