import { Fragment } from 'react';
import ImmutablePropTypes from 'react-immutable-proptypes';
import ImmutablePureComponent from 'react-immutable-pure-component';
import { FormattedMessage, injectIntl, defineMessages } from 'react-intl';
import classNames from 'classnames/bind'
import { isRtl } from '../../utils/rtl';
import Button from '../button'
import Icon from '../icon';

const MAX_HEIGHT = 200;

const messages = defineMessages({
  showMore: { id: 'status.show_more', defaultMessage: 'Show more' },
  showLess: { id: 'status.show_less', defaultMessage: 'Show less' },
  readMore: { id: 'status.read_more', defaultMessage: 'Read more' },
})

const cx = classNames.bind(_s)

export default
@injectIntl
class StatusContent extends ImmutablePureComponent {

  static contextTypes = {
    router: PropTypes.object,
  };

  static propTypes = {
    status: ImmutablePropTypes.map.isRequired,
    reblogStatus: PropTypes.string,
    expanded: PropTypes.bool,
    onExpandedToggle: PropTypes.func,
    onClick: PropTypes.func,
    collapsable: PropTypes.bool,
    intl: PropTypes.object.isRequired,
    isComment: PropTypes.bool,
  };

  state = {
    hidden: true,
    collapsed: null, //  `collapsed: null` indicates that an element doesn't need collapsing, while `true` or `false` indicates that it does (and is/isn't).
  };

  _updateStatusLinks () {
    const node = this.node;

    if (!node) return;

    const links = node.querySelectorAll('a');

    for (var i = 0; i < links.length; ++i) {
      let link = links[i];
      if (link.classList.contains('status-link')) {
        continue;
      }
      link.classList.add('status-link');

      let mention = this.props.status.get('mentions').find(item => link.href === `${item.get('url')}`);

      if (mention) {
        link.addEventListener('click', this.onMentionClick.bind(this, mention), false);
        link.setAttribute('title', mention.get('acct'));
      } else if (link.textContent[0] === '#' || (link.previousSibling && link.previousSibling.textContent && link.previousSibling.textContent[link.previousSibling.textContent.length - 1] === '#')) {
        link.addEventListener('click', this.onHashtagClick.bind(this, link.text), false);
      } else {
        link.setAttribute('title', link.href);
      }
    }

    if (
      this.props.collapsable
      && this.props.onClick
      && this.state.collapsed === null
      && node.clientHeight > MAX_HEIGHT
      && this.props.status.get('spoiler_text').length === 0
    ) {
      this.setState({ collapsed: true });
    }
  }

  componentDidMount () {
    this._updateStatusLinks();
  }

  componentDidUpdate () {
    this._updateStatusLinks();
  }

  onMentionClick = (mention, e) => {
    if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
      e.preventDefault();
      this.context.router.history.push(`/${mention.get('acct')}`);
    }
  }

  onHashtagClick = (hashtag, e) => {
    hashtag = hashtag.replace(/^#/, '').toLowerCase();

    if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
      e.preventDefault();
      this.context.router.history.push(`/tags/${hashtag}`);
    }
  }

  handleMouseDown = (e) => {
    this.startXY = [e.clientX, e.clientY];
  }

  handleMouseUp = (e) => {
    if (!this.startXY) return;

    const [ startX, startY ] = this.startXY;
    const [ deltaX, deltaY ] = [Math.abs(e.clientX - startX), Math.abs(e.clientY - startY)];

    if (e.target.localName === 'button' ||
        e.target.localName === 'a' ||
        (e.target.parentNode && (e.target.parentNode.localName === 'button' || e.target.parentNode.localName === 'a'))) {
      return;
    }

    if (deltaX + deltaY < 5 && e.button === 0 && this.props.onClick) {
      this.props.onClick();
    }

    this.startXY = null;
  }

  handleSpoilerClick = (e) => {
    e.preventDefault();

    if (this.props.onExpandedToggle) {
      // The parent manages the state
      this.props.onExpandedToggle();
    } else {
      this.setState({ hidden: !this.state.hidden });
    }
  }

  handleCollapsedClick = (e) => {
    e.preventDefault();
    this.setState({ collapsed: !this.state.collapsed });
  }

  setRef = (c) => {
    this.node = c;
  }

  getHtmlContent = () => {
    const { status, reblogContent } = this.props;

    const properContent = status.get('contentHtml');

    return reblogContent
      ? `${reblogContent} <div class='status__quote'>${properContent}</div>`
      : properContent;
  }

  render () {
    const { status, intl, isComment } = this.props;

    if (status.get('content').length === 0) return null;

    const hidden = this.props.onExpandedToggle ? !this.props.expanded : this.state.hidden;

    const content = { __html: this.getHtmlContent() };
    const spoilerContent = { __html: status.get('spoilerHtml') };
    const directionStyle = { direction: 'ltr' };
    // const classNames = ''; 
    // classnames('status__content', {
    //   'status__content--with-action': this.props.onClick && this.context.router,
    //   'status__content--with-spoiler': status.get('spoiler_text').length > 0,
    //   'status__content--collapsed': this.state.collapsed === true,
    //   // _s.px15, _s.mb15
    // });

    if (isRtl(status.get('search_index'))) {
      directionStyle.direction = 'rtl';
    }

    if (status.get('spoiler_text').length > 0) {
      let mentionsPlaceholder = '';

      const mentionLinks = status.get('mentions').map(item => (
        <Button to={`/${item.get('acct')}`} href={`/${item.get('acct')}`} key={item.get('id')} className='mention'>
          @<span>{item.get('username')}</span>
        </Button>
      )).reduce((aggregate, item) => [...aggregate, item, ' '], []);

      const toggleText = intl.formatMessage(hidden ? messages.showMore : messages.showLess);

      if (hidden) {
        mentionsPlaceholder = <div>{mentionLinks}</div>;
      }

      return (
        <div className={[].join(' ')} ref={this.setRef} tabIndex='0' style={directionStyle} onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp}>
          <p style={{ marginBottom: hidden && status.get('mentions').isEmpty() ? '0px' : null }}>
            <span dangerouslySetInnerHTML={spoilerContent} lang={status.get('language')} />
            {' '}
            <button tabIndex='0' className={`status__content__spoiler-link ${hidden ? 'status__content__spoiler-link--show-more' : 'status__content__spoiler-link--show-less'}`} onClick={this.handleSpoilerClick}>{toggleText}</button>
          </p>

          {mentionsPlaceholder}

          <div tabIndex={!hidden ? 0 : null} className={`status__content__text ${!hidden ? 'status__content__text--visible' : ''}`} style={directionStyle} dangerouslySetInnerHTML={content} lang={status.get('language')} />
        </div>
      );
    } else if (this.props.onClick) {
      const hasMarginBottom = !!status.get('card') || !!status.get('poll') || status.get('media_attachments').size > 0

      const containerClasses = cx({
        px15: !isComment,
        mb15: hasMarginBottom,
      })

      return (
        <div className={containerClasses}>
          <div
            ref={this.setRef}
            tabIndex='0'
            className={[_s.statusContent].join(' ')}
            style={directionStyle}
            dangerouslySetInnerHTML={content}
            lang={status.get('language')}
            onMouseDown={this.handleMouseDown}
            onMouseUp={this.handleMouseUp}
          />
          {
            this.state.collapsed &&
            <button
              className={[_s.default, _s.displayFlex, _s.cursorPointer, _s.py2, _s.text, _s.colorPrimary, _s.fontWeightBold, _s.fontSize15PX].join(' ')}
              onClick={this.props.onClick}
            >
              {intl.formatMessage(messages.readMore)}
            </button>
          }
        </div>
      )
    }

    return (
      <div
        tabIndex='0'
        ref={this.setRef}
        className={[_s.px15, _s.mb15, _s.statusContent].join(' ')}
        style={directionStyle}
        dangerouslySetInnerHTML={content}
        lang={status.get('language')}
      />
    );
  }

}