import PropTypes from "prop-types";
import { PureComponent } from "react";

import { FormattedMessage, injectIntl } from "react-intl";

import classnames from "classnames";
import { Link } from "react-router-dom";

import ImmutablePropTypes from "react-immutable-proptypes";
import { connect } from "react-redux";

import { Icon }  from "mastodon/components/icon";
import PollContainer from "mastodon/containers/poll_container";
import { autoPlayGif } from "mastodon/initial_state";

const MAX_HEIGHT = 706; // 22px * 32 (+ 2px padding at the top)

/**
 *
 * @param {any} status
 * @returns {string}
 */
export function getStatusContent(status) {
  return status.getIn(["translation", "contentHtml"]) || status.get("contentHtml");
}

class StatusContent extends PureComponent {

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

  static propTypes = {
    status: ImmutablePropTypes.map.isRequired,
    statusContent: PropTypes.string,
    expanded: PropTypes.bool,
    onExpandedToggle: PropTypes.func,
    onTranslate: PropTypes.func,
    onClick: PropTypes.func,
    collapsible: PropTypes.bool,
    onCollapsedToggle: PropTypes.func,
  };

  state = {
    hidden: true,
  };

  _updateStatusLinks () {
    const node = this.node;

    if (!node) {
      return;
    }

    const { status, onCollapsedToggle } = this.props;
    const links = node.querySelectorAll("a");

    let link, mention;

    for (var i = 0; i < links.length; ++i) {
      link = links[i];

      if (link.classList.contains("status-link")) {
        continue;
      }

      link.classList.add("status-link");

      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", `@${mention.get("acct")}`);
        link.setAttribute("href", `/@${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);
        link.setAttribute("href", `/tags/${link.text.replace(/^#/, "")}`);
      } else {
        link.setAttribute("title", link.href);
        link.classList.add("unhandled-link");
      }
    }

    if (status.get("collapsed", null) === null && onCollapsedToggle) {
      const { collapsible, onClick } = this.props;

      const collapsed =
          collapsible
          && onClick
          && node.clientHeight > MAX_HEIGHT
          && status.get("spoiler_text").length === 0;

      onCollapsedToggle(collapsed);
    }
  }

  handleMouseEnter = ({ currentTarget }) => {
    if (autoPlayGif) {
      return;
    }

    const emojis = currentTarget.querySelectorAll(".custom-emoji");

    for (var i = 0; i < emojis.length; i++) {
      let emoji = emojis[i];
      emoji.src = emoji.getAttribute("data-original");
    }
  };

  handleMouseLeave = ({ currentTarget }) => {
    if (autoPlayGif) {
      return;
    }

    const emojis = currentTarget.querySelectorAll(".custom-emoji");

    for (var i = 0; i < emojis.length; i++) {
      let emoji = emojis[i];
      emoji.src = emoji.getAttribute("data-static");
    }
  };

  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(/^#/, "");

    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)];

    let element = e.target;
    while (element) {
      if (element.localName === "button" || element.localName === "a" || element.localName === "label") {
        return;
      }
      element = element.parentNode;
    }

    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 });
    }
  };

  handleTranslate = () => {
    this.props.onTranslate();
  };

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

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

    const hidden = this.props.onExpandedToggle ? !this.props.expanded : this.state.hidden;
    const renderReadMore = this.props.onClick && status.get("collapsed");

    const content = { __html: statusContent ?? getStatusContent(status) };
    const spoilerContent = { __html: status.getIn(["translation", "spoilerHtml"]) || status.get("spoilerHtml") };
    const language = status.getIn(["translation", "language"]) || status.get("language");
    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": renderReadMore,
    });

    const readMoreButton = renderReadMore && (
      <button className='status__content__read-more-button' onClick={this.props.onClick} key='read-more'>
        <FormattedMessage id='status.read_more' defaultMessage='Read more' /><Icon id='angle-right' fixedWidth />
      </button>
    );

    const poll = !!status.get("poll") && (
      <PollContainer pollId={status.get("poll")} lang={language} />
    );

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

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

      const toggleText = hidden ? <FormattedMessage id='status.show_more' defaultMessage='Show more' /> : <FormattedMessage id='status.show_less' defaultMessage='Show less' />;

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

      return (
        <div className={classNames} ref={this.setRef} tabIndex={0} onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
          <p style={{ marginBottom: hidden && status.get("mentions").isEmpty() ? "0px" : null }}>
            <span dangerouslySetInnerHTML={spoilerContent} className='translate' lang={language} />
            {" "}
            <button type='button' className={`status__content__spoiler-link ${hidden ? "status__content__spoiler-link--show-more" : "status__content__spoiler-link--show-less"}`} onClick={this.handleSpoilerClick} aria-expanded={!hidden}>{toggleText}</button>
          </p>

          {mentionsPlaceholder}

          <div tabIndex={!hidden ? 0 : null} className={`status__content__text ${!hidden ? "status__content__text--visible" : ""} translate`} lang={language} dangerouslySetInnerHTML={content} />

          {!hidden && poll}
        </div>
      );
    } else if (this.props.onClick) {
      return (
        <>
          <div className={classNames} ref={this.setRef} tabIndex={0} onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp} key='status-content' onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
            <div className='status__content__text status__content__text--visible translate' lang={language} dangerouslySetInnerHTML={content} />

            {poll}
          </div>

          {readMoreButton}
        </>
      );
    } else {
      return (
        <div className={classNames} ref={this.setRef} tabIndex={0} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
          <div className='status__content__text status__content__text--visible translate' lang={language} dangerouslySetInnerHTML={content} />

          {poll}
        </div>
      );
    }
  }

}

export default connect()(injectIntl(StatusContent));