import PropTypes from "prop-types";

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

import { Helmet } from "react-helmet";

import { List as ImmutableList } from "immutable";
import ImmutablePropTypes from "react-immutable-proptypes";
import ImmutablePureComponent from "react-immutable-pure-component";
import { connect } from "react-redux";
import { createSelector } from "reselect";

import { fetchFollowRequests } from "flavours/glitch/actions/accounts";
import { fetchLists } from "flavours/glitch/actions/lists";
import { openModal } from "flavours/glitch/actions/modal";
import Column from "flavours/glitch/features/ui/components/column";
import ColumnLink from "flavours/glitch/features/ui/components/column_link";
import ColumnSubheading from "flavours/glitch/features/ui/components/column_subheading";
import LinkFooter from "flavours/glitch/features/ui/components/link_footer";
import { me, showTrends } from "flavours/glitch/initial_state";
import { preferencesLink } from "flavours/glitch/utils/backend_links";

import NavigationBar from "../compose/components/navigation_bar";

import TrendsContainer from "./containers/trends_container";


const messages = defineMessages({
  heading: { id: "getting_started.heading", defaultMessage: "Getting started" },
  home_timeline: { id: "tabs_bar.home", defaultMessage: "Home" },
  notifications: { id: "tabs_bar.notifications", defaultMessage: "Notifications" },
  public_timeline: { id: "navigation_bar.public_timeline", defaultMessage: "Federated timeline" },
  navigation_subheading: { id: "column_subheading.navigation", defaultMessage: "Navigation" },
  settings_subheading: { id: "column_subheading.settings", defaultMessage: "Settings" },
  community_timeline: { id: "navigation_bar.community_timeline", defaultMessage: "Local timeline" },
  explore: { id: "navigation_bar.explore", defaultMessage: "Explore" },
  direct: { id: "navigation_bar.direct", defaultMessage: "Private mentions" },
  bookmarks: { id: "navigation_bar.bookmarks", defaultMessage: "Bookmarks" },
  preferences: { id: "navigation_bar.preferences", defaultMessage: "Preferences" },
  settings: { id: "navigation_bar.app_settings", defaultMessage: "App settings" },
  follow_requests: { id: "navigation_bar.follow_requests", defaultMessage: "Follow requests" },
  lists: { id: "navigation_bar.lists", defaultMessage: "Lists" },
  keyboard_shortcuts: { id: "navigation_bar.keyboard_shortcuts", defaultMessage: "Keyboard shortcuts" },
  lists_subheading: { id: "column_subheading.lists", defaultMessage: "Lists" },
  misc: { id: "navigation_bar.misc", defaultMessage: "Misc" },
  menu: { id: "getting_started.heading", defaultMessage: "Getting started" },
});

const makeMapStateToProps = () => {
  const getOrderedLists = createSelector([state => state.get("lists")], lists => {
    if (!lists) {
      return lists;
    }

    return lists.toList().filter(item => !!item).sort((a, b) => a.get("title").localeCompare(b.get("title")));
  });

  const mapStateToProps = state => ({
    lists: getOrderedLists(state),
    myAccount: state.getIn(["accounts", me]),
    columns: state.getIn(["settings", "columns"]),
    unreadFollowRequests: state.getIn(["user_lists", "follow_requests", "items"], ImmutableList()).size,
    unreadNotifications: state.getIn(["notifications", "unread"]),
  });

  return mapStateToProps;
};

const mapDispatchToProps = dispatch => ({
  fetchFollowRequests: () => dispatch(fetchFollowRequests()),
  fetchLists: () => dispatch(fetchLists()),
  openSettings: () => dispatch(openModal({
    modalType: "SETTINGS",
    modalProps: {},
  })),
});

const badgeDisplay = (number, limit) => {
  if (number === 0) {
    return undefined;
  } else if (limit && number >= limit) {
    return `${limit}+`;
  } else {
    return number;
  }
};

class GettingStarted extends ImmutablePureComponent {

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

  static propTypes = {
    intl: PropTypes.object.isRequired,
    myAccount: ImmutablePropTypes.map,
    columns: ImmutablePropTypes.list,
    multiColumn: PropTypes.bool,
    fetchFollowRequests: PropTypes.func.isRequired,
    unreadFollowRequests: PropTypes.number,
    unreadNotifications: PropTypes.number,
    lists: ImmutablePropTypes.list,
    fetchLists: PropTypes.func.isRequired,
    openSettings: PropTypes.func.isRequired,
  };

  UNSAFE_componentWillMount () {
    this.props.fetchLists();
  }

  componentDidMount () {
    const { fetchFollowRequests } = this.props;
    const { signedIn } = this.context.identity;

    if (!signedIn) {
      return;
    }

    fetchFollowRequests();
  }

  render () {
    const { intl, myAccount, columns, multiColumn, unreadFollowRequests, unreadNotifications, lists, openSettings } = this.props;
    const { signedIn } = this.context.identity;

    const navItems = [];
    let listItems = [];

    if (multiColumn) {
      if (signedIn && !columns.find(item => item.get("id") === "HOME")) {
        navItems.push(<ColumnLink key='home' icon='home' text={intl.formatMessage(messages.home_timeline)} to='/home' />);
      }

      if (!columns.find(item => item.get("id") === "NOTIFICATIONS")) {
        navItems.push(<ColumnLink key='notifications' icon='bell' text={intl.formatMessage(messages.notifications)} badge={badgeDisplay(unreadNotifications)} to='/notifications' />);
      }

      if (!columns.find(item => item.get("id") === "COMMUNITY")) {
        navItems.push(<ColumnLink key='community_timeline' icon='users' text={intl.formatMessage(messages.community_timeline)} to='/public/local' />);
      }

      if (!columns.find(item => item.get("id") === "PUBLIC")) {
        navItems.push(<ColumnLink key='public_timeline' icon='globe' text={intl.formatMessage(messages.public_timeline)} to='/public' />);
      }
    }

    if (showTrends) {
      navItems.push(<ColumnLink key='explore' icon='hashtag' text={intl.formatMessage(messages.explore)} to='/explore' />);
    }

    if (signedIn) {
      if (!multiColumn || !columns.find(item => item.get("id") === "DIRECT")) {
        navItems.push(<ColumnLink key='conversations' icon='envelope' text={intl.formatMessage(messages.direct)} to='/conversations' />);
      }

      if (!multiColumn || !columns.find(item => item.get("id") === "BOOKMARKS")) {
        navItems.push(<ColumnLink key='bookmarks' icon='bookmark' text={intl.formatMessage(messages.bookmarks)} to='/bookmarks' />);
      }

      if (myAccount.get("locked") || unreadFollowRequests > 0) {
        navItems.push(<ColumnLink key='follow_requests' icon='user-plus' text={intl.formatMessage(messages.follow_requests)} badge={badgeDisplay(unreadFollowRequests, 40)} to='/follow_requests' />);
      }

      navItems.push(<ColumnLink key='getting_started' icon='ellipsis-h' text={intl.formatMessage(messages.misc)} to='/getting-started-misc' />);

      listItems = listItems.concat([
        <div key='9'>
          <ColumnLink key='lists' icon='bars' text={intl.formatMessage(messages.lists)} to='/lists' />
          {lists.filter(list => !columns.find(item => item.get("id") === "LIST" && item.getIn(["params", "id"]) === list.get("id"))).map(list =>
            <ColumnLink key={`list-${list.get("id")}`} to={`/lists/${list.get("id")}`} icon='list-ul' text={list.get("title")} />,
          )}
        </div>,
      ]);
    }

    return (
      <Column bindToDocument={!multiColumn} name='getting-started' icon='asterisk' heading={intl.formatMessage(messages.heading)} label={intl.formatMessage(messages.menu)} hideHeadingOnMobile>
        <div className='scrollable optionally-scrollable'>
          <div className='getting-started__wrapper'>
            {!multiColumn && signedIn && <NavigationBar account={myAccount} />}
            {multiColumn && <ColumnSubheading text={intl.formatMessage(messages.navigation_subheading)} />}
            {navItems}
            {signedIn && (
              <>
                <ColumnSubheading text={intl.formatMessage(messages.lists_subheading)} />
                {listItems}
                <ColumnSubheading text={intl.formatMessage(messages.settings_subheading)} />
                { preferencesLink !== undefined && <ColumnLink icon='cog' text={intl.formatMessage(messages.preferences)} href={preferencesLink} /> }
                <ColumnLink icon='cogs' text={intl.formatMessage(messages.settings)} onClick={openSettings} />
              </>
            )}
          </div>

          <LinkFooter multiColumn />
        </div>

        {(multiColumn && showTrends) && <TrendsContainer />}

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

}

export default connect(makeMapStateToProps, mapDispatchToProps)(injectIntl(GettingStarted));