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

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

import classNames from "classnames";

import ImmutablePropTypes from "react-immutable-proptypes";
import ImmutablePureComponent from "react-immutable-pure-component";

import TransitionMotion from "react-motion/lib/TransitionMotion";
import spring from "react-motion/lib/spring";
import ReactSwipeableViews from "react-swipeable-views";

import elephantUIPlane from "mastodon/../images/elephant_ui_plane.svg";
import { AnimatedNumber } from "mastodon/components/animated_number";
import { Icon }  from "mastodon/components/icon";
import { IconButton } from "mastodon/components/icon_button";
import EmojiPickerDropdown from "mastodon/features/compose/containers/emoji_picker_dropdown_container";
import unicodeMapping from "mastodon/features/emoji/emoji_unicode_mapping_light";
import { autoPlayGif, reduceMotion, disableSwiping, mascot } from "mastodon/initial_state";
import { assetHost } from "mastodon/utils/config";

const messages = defineMessages({
  close: { id: "lightbox.close", defaultMessage: "Close" },
  previous: { id: "lightbox.previous", defaultMessage: "Previous" },
  next: { id: "lightbox.next", defaultMessage: "Next" },
});

class Content extends ImmutablePureComponent {

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

  static propTypes = {
    announcement: ImmutablePropTypes.map.isRequired,
  };

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

  componentDidMount () {
    this._updateLinks();
  }

  componentDidUpdate () {
    this._updateLinks();
  }

  _updateLinks () {
    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.announcement.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 {
        let status = this.props.announcement.get("statuses").find(item => link.href === item.get("url"));
        if (status) {
          link.addEventListener("click", this.onStatusClick.bind(this, status), false);
        }
        link.setAttribute("title", link.href);
        link.classList.add("unhandled-link");
      }

      link.setAttribute("target", "_blank");
      link.setAttribute("rel", "noopener noreferrer");
    }
  }

  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}`);
    }
  };

  onStatusClick = (status, e) => {
    if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
      e.preventDefault();
      this.context.router.history.push(`/@${status.getIn(["account", "acct"])}/${status.get("id")}`);
    }
  };

  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");
    }
  };

  render () {
    const { announcement } = this.props;

    return (
      <div
        className='announcements__item__content translate'
        ref={this.setRef}
        dangerouslySetInnerHTML={{ __html: announcement.get("contentHtml") }}
        onMouseEnter={this.handleMouseEnter}
        onMouseLeave={this.handleMouseLeave}
      />
    );
  }

}

class Emoji extends PureComponent {

  static propTypes = {
    emoji: PropTypes.string.isRequired,
    emojiMap: ImmutablePropTypes.map.isRequired,
    hovered: PropTypes.bool.isRequired,
  };

  render () {
    const { emoji, emojiMap, hovered } = this.props;

    if (unicodeMapping[emoji]) {
      const { filename, shortCode } = unicodeMapping[this.props.emoji];
      const title = shortCode ? `:${shortCode}:` : "";

      return (
        <img
          draggable='false'
          className='emojione'
          alt={emoji}
          title={title}
          src={`${assetHost}/emoji/${filename}.svg`}
        />
      );
    } else if (emojiMap.get(emoji)) {
      const filename  = (autoPlayGif || hovered) ? emojiMap.getIn([emoji, "url"]) : emojiMap.getIn([emoji, "static_url"]);
      const shortCode = `:${emoji}:`;

      return (
        <img
          draggable='false'
          className='emojione custom-emoji'
          alt={shortCode}
          title={shortCode}
          src={filename}
        />
      );
    } else {
      return null;
    }
  }

}

class Reaction extends ImmutablePureComponent {

  static propTypes = {
    announcementId: PropTypes.string.isRequired,
    reaction: ImmutablePropTypes.map.isRequired,
    addReaction: PropTypes.func.isRequired,
    removeReaction: PropTypes.func.isRequired,
    emojiMap: ImmutablePropTypes.map.isRequired,
    style: PropTypes.object,
  };

  state = {
    hovered: false,
  };

  handleClick = () => {
    const { reaction, announcementId, addReaction, removeReaction } = this.props;

    if (reaction.get("me")) {
      removeReaction(announcementId, reaction.get("name"));
    } else {
      addReaction(announcementId, reaction.get("name"));
    }
  };

  handleMouseEnter = () => this.setState({ hovered: true });

  handleMouseLeave = () => this.setState({ hovered: false });

  render () {
    const { reaction } = this.props;

    let shortCode = reaction.get("name");

    if (unicodeMapping[shortCode]) {
      shortCode = unicodeMapping[shortCode].shortCode;
    }

    return (
      <button className={classNames("reactions-bar__item", { active: reaction.get("me") })} onClick={this.handleClick} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave} title={`:${shortCode}:`} style={this.props.style}>
        <span className='reactions-bar__item__emoji'><Emoji hovered={this.state.hovered} emoji={reaction.get("name")} emojiMap={this.props.emojiMap} /></span>
        <span className='reactions-bar__item__count'><AnimatedNumber value={reaction.get("count")} /></span>
      </button>
    );
  }

}

class ReactionsBar extends ImmutablePureComponent {

  static propTypes = {
    announcementId: PropTypes.string.isRequired,
    reactions: ImmutablePropTypes.list.isRequired,
    addReaction: PropTypes.func.isRequired,
    removeReaction: PropTypes.func.isRequired,
    emojiMap: ImmutablePropTypes.map.isRequired,
  };

  handleEmojiPick = data => {
    const { addReaction, announcementId } = this.props;
    addReaction(announcementId, data.native.replace(/:/g, ""));
  };

  willEnter () {
    return { scale: reduceMotion ? 1 : 0 };
  }

  willLeave () {
    return { scale: reduceMotion ? 0 : spring(0, { stiffness: 170, damping: 26 }) };
  }

  render () {
    const { reactions } = this.props;
    const visibleReactions = reactions.filter(x => x.get("count") > 0);

    const styles = visibleReactions.map(reaction => ({
      key: reaction.get("name"),
      data: reaction,
      style: { scale: reduceMotion ? 1 : spring(1, { stiffness: 150, damping: 13 }) },
    })).toArray();

    return (
      <TransitionMotion styles={styles} willEnter={this.willEnter} willLeave={this.willLeave}>
        {items => (
          <div className={classNames("reactions-bar", { "reactions-bar--empty": visibleReactions.isEmpty() })}>
            {items.map(({ key, data, style }) => (
              <Reaction
                key={key}
                reaction={data}
                style={{ transform: `scale(${style.scale})`, position: style.scale < 0.5 ? "absolute" : "static" }}
                announcementId={this.props.announcementId}
                addReaction={this.props.addReaction}
                removeReaction={this.props.removeReaction}
                emojiMap={this.props.emojiMap}
              />
            ))}

            {visibleReactions.size < 8 && <EmojiPickerDropdown onPickEmoji={this.handleEmojiPick} button={<Icon id='plus' />} />}
          </div>
        )}
      </TransitionMotion>
    );
  }

}

class Announcement extends ImmutablePureComponent {

  static propTypes = {
    announcement: ImmutablePropTypes.map.isRequired,
    emojiMap: ImmutablePropTypes.map.isRequired,
    addReaction: PropTypes.func.isRequired,
    removeReaction: PropTypes.func.isRequired,
    intl: PropTypes.object.isRequired,
    selected: PropTypes.bool,
  };

  state = {
    unread: !this.props.announcement.get("read"),
  };

  componentDidUpdate () {
    const { selected, announcement } = this.props;
    if (!selected && this.state.unread !== !announcement.get("read")) {
      this.setState({ unread: !announcement.get("read") });
    }
  }

  render () {
    const { announcement } = this.props;
    const { unread } = this.state;
    const startsAt = announcement.get("starts_at") && new Date(announcement.get("starts_at"));
    const endsAt = announcement.get("ends_at") && new Date(announcement.get("ends_at"));
    const now = new Date();
    const hasTimeRange = startsAt && endsAt;
    const skipYear = hasTimeRange && startsAt.getFullYear() === endsAt.getFullYear() && endsAt.getFullYear() === now.getFullYear();
    const skipEndDate = hasTimeRange && startsAt.getDate() === endsAt.getDate() && startsAt.getMonth() === endsAt.getMonth() && startsAt.getFullYear() === endsAt.getFullYear();
    const skipTime = announcement.get("all_day");

    return (
      <div className='announcements__item'>
        <strong className='announcements__item__range'>
          <FormattedMessage id='announcement.announcement' defaultMessage='Announcement' />
          {hasTimeRange && <span> · <FormattedDate value={startsAt} hour12={false} year={(skipYear || startsAt.getFullYear() === now.getFullYear()) ? undefined : "numeric"} month='short' day='2-digit' hour={skipTime ? undefined : "2-digit"} minute={skipTime ? undefined : "2-digit"} /> - <FormattedDate value={endsAt} hour12={false} year={(skipYear || endsAt.getFullYear() === now.getFullYear()) ? undefined : "numeric"} month={skipEndDate ? undefined : "short"} day={skipEndDate ? undefined : "2-digit"} hour={skipTime ? undefined : "2-digit"} minute={skipTime ? undefined : "2-digit"} /></span>}
        </strong>

        <Content announcement={announcement} />

        <ReactionsBar
          reactions={announcement.get("reactions")}
          announcementId={announcement.get("id")}
          addReaction={this.props.addReaction}
          removeReaction={this.props.removeReaction}
          emojiMap={this.props.emojiMap}
        />

        {unread && <span className='announcements__item__unread' />}
      </div>
    );
  }

}

class Announcements extends ImmutablePureComponent {

  static propTypes = {
    announcements: ImmutablePropTypes.list,
    emojiMap: ImmutablePropTypes.map.isRequired,
    dismissAnnouncement: PropTypes.func.isRequired,
    addReaction: PropTypes.func.isRequired,
    removeReaction: PropTypes.func.isRequired,
    intl: PropTypes.object.isRequired,
  };

  state = {
    index: 0,
  };

  static getDerivedStateFromProps(props, state) {
    if (props.announcements.size > 0 && state.index >= props.announcements.size) {
      return { index: props.announcements.size - 1 };
    } else {
      return null;
    }
  }

  componentDidMount () {
    this._markAnnouncementAsRead();
  }

  componentDidUpdate () {
    this._markAnnouncementAsRead();
  }

  _markAnnouncementAsRead () {
    const { dismissAnnouncement, announcements } = this.props;
    const { index } = this.state;
    const announcement = announcements.get(announcements.size - 1 - index);
    if (!announcement.get("read")) {
      dismissAnnouncement(announcement.get("id"));
    }
  }

  handleChangeIndex = index => {
    this.setState({ index: index % this.props.announcements.size });
  };

  handleNextClick = () => {
    this.setState({ index: (this.state.index + 1) % this.props.announcements.size });
  };

  handlePrevClick = () => {
    this.setState({ index: (this.props.announcements.size + this.state.index - 1) % this.props.announcements.size });
  };

  render () {
    const { announcements, intl } = this.props;
    const { index } = this.state;

    if (announcements.isEmpty()) {
      return null;
    }

    return (
      <div className='announcements'>
        <img className='announcements__mastodon' alt='' draggable='false' src={mascot || elephantUIPlane} />

        <div className='announcements__container'>
          <ReactSwipeableViews animateHeight animateTransitions={!reduceMotion} index={index} onChangeIndex={this.handleChangeIndex}>
            {announcements.map((announcement, idx) => (
              <Announcement
                key={announcement.get("id")}
                announcement={announcement}
                emojiMap={this.props.emojiMap}
                addReaction={this.props.addReaction}
                removeReaction={this.props.removeReaction}
                intl={intl}
                selected={index === idx}
                disabled={disableSwiping}
              />
            )).reverse()}
          </ReactSwipeableViews>

          {announcements.size > 1 && (
            <div className='announcements__pagination'>
              <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.previous)} icon='chevron-left' onClick={this.handlePrevClick} size={13} />
              <span>{index + 1} / {announcements.size}</span>
              <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.next)} icon='chevron-right' onClick={this.handleNextClick} size={13} />
            </div>
          )}
        </div>
      </div>
    );
  }

}

export default injectIntl(Announcements);