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

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

import { Helmet } from "react-helmet";

import { connect } from "react-redux";

import { DismissableBanner } from "mastodon/components/dismissable_banner";
import { domain } from "mastodon/initial_state";

import { addColumn, removeColumn, moveColumn } from "../../actions/columns";
import { connectCommunityStream } from "../../actions/streaming";
import { expandCommunityTimeline } from "../../actions/timelines";
import Column from "../../components/column";
import ColumnHeader from "../../components/column_header";
import StatusListContainer from "../ui/containers/status_list_container";

import ColumnSettingsContainer from "./containers/column_settings_container";

const messages = defineMessages({
  title: { id: "column.community", defaultMessage: "Local timeline" },
});

const mapStateToProps = (state, { columnId }) => {
  const uuid = columnId;
  const columns = state.getIn(["settings", "columns"]);
  const index = columns.findIndex(c => c.get("uuid") === uuid);
  const onlyMedia = (columnId && index >= 0) ? columns.get(index).getIn(["params", "other", "onlyMedia"]) : state.getIn(["settings", "community", "other", "onlyMedia"]);
  const timelineState = state.getIn(["timelines", `community${onlyMedia ? ":media" : ""}`]);

  return {
    hasUnread: !!timelineState && timelineState.get("unread") > 0,
    onlyMedia,
  };
};

class CommunityTimeline extends PureComponent {

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

  static defaultProps = {
    onlyMedia: false,
  };

  static propTypes = {
    dispatch: PropTypes.func.isRequired,
    columnId: PropTypes.string,
    intl: PropTypes.object.isRequired,
    hasUnread: PropTypes.bool,
    multiColumn: PropTypes.bool,
    onlyMedia: PropTypes.bool,
  };

  handlePin = () => {
    const { columnId, dispatch, onlyMedia } = this.props;

    if (columnId) {
      dispatch(removeColumn(columnId));
    } else {
      dispatch(addColumn("COMMUNITY", { other: { onlyMedia } }));
    }
  };

  handleMove = (dir) => {
    const { columnId, dispatch } = this.props;
    dispatch(moveColumn(columnId, dir));
  };

  handleHeaderClick = () => {
    this.column.scrollTop();
  };

  componentDidMount () {
    const { dispatch, onlyMedia } = this.props;
    const { signedIn } = this.context.identity;

    dispatch(expandCommunityTimeline({ onlyMedia }));

    if (signedIn) {
      this.disconnect = dispatch(connectCommunityStream({ onlyMedia }));
    }
  }

  componentDidUpdate (prevProps) {
    const { signedIn } = this.context.identity;

    if (prevProps.onlyMedia !== this.props.onlyMedia) {
      const { dispatch, onlyMedia } = this.props;

      if (this.disconnect) {
        this.disconnect();
      }

      dispatch(expandCommunityTimeline({ onlyMedia }));

      if (signedIn) {
        this.disconnect = dispatch(connectCommunityStream({ onlyMedia }));
      }
    }
  }

  componentWillUnmount () {
    if (this.disconnect) {
      this.disconnect();
      this.disconnect = null;
    }
  }

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

  handleLoadMore = maxId => {
    const { dispatch, onlyMedia } = this.props;

    dispatch(expandCommunityTimeline({ maxId, onlyMedia }));
  };

  render () {
    const { intl, hasUnread, columnId, multiColumn, onlyMedia } = this.props;
    const pinned = !!columnId;

    return (
      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
        <ColumnHeader
          icon='users'
          active={hasUnread}
          title={intl.formatMessage(messages.title)}
          onPin={this.handlePin}
          onMove={this.handleMove}
          onClick={this.handleHeaderClick}
          pinned={pinned}
          multiColumn={multiColumn}
        >
          <ColumnSettingsContainer columnId={columnId} />
        </ColumnHeader>

        <StatusListContainer
          prepend={<DismissableBanner id='community_timeline'><FormattedMessage id='dismissable_banner.community_timeline' defaultMessage='These are the most recent public posts from people whose accounts are hosted by {domain}.' values={{ domain }} /></DismissableBanner>}
          trackScroll={!pinned}
          scrollKey={`community_timeline-${columnId}`}
          timelineId={`community${onlyMedia ? ":media" : ""}`}
          onLoadMore={this.handleLoadMore}
          emptyMessage={<FormattedMessage id='empty_column.community' defaultMessage='The local timeline is empty. Write something publicly to get the ball rolling!' />}
          bindToDocument={!multiColumn}
        />

        <Helmet>
          <title>{intl.formatMessage(messages.title)}</title>
          <meta name='robots' content='noindex' />
        </Helmet>
      </Column>
    );
  }

}

export default connect(mapStateToProps)(injectIntl(CommunityTimeline));