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

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

import { Helmet } from "react-helmet";
import { NavLink, Switch, Route } from "react-router-dom";

import { connect } from "react-redux";

import Column from "mastodon/components/column";
import ColumnHeader from "mastodon/components/column_header";
import Search from "mastodon/features/compose/containers/search_container";
import { trendsEnabled } from "mastodon/initial_state";

import Links from "./links";
import SearchResults from "./results";
import Statuses from "./statuses";
import Suggestions from "./suggestions";
import Tags from "./tags";

const messages = defineMessages({
  title: { id: "explore.title", defaultMessage: "Explore" },
  searchResults: { id: "explore.search_results", defaultMessage: "Search results" },
});

const mapStateToProps = state => ({
  layout: state.getIn(["meta", "layout"]),
  isSearching: state.getIn(["search", "submitted"]) || !trendsEnabled,
});

class Explore extends PureComponent {

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

  static propTypes = {
    intl: PropTypes.object.isRequired,
    multiColumn: PropTypes.bool,
    isSearching: PropTypes.bool,
  };

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

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

  render() {
    const { intl, multiColumn, isSearching } = this.props;
    const { signedIn } = this.context.identity;

    return (
      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
        <ColumnHeader
          icon={isSearching ? "search" : "hashtag"}
          title={intl.formatMessage(isSearching ? messages.searchResults : messages.title)}
          onClick={this.handleHeaderClick}
          multiColumn={multiColumn}
        />

        <div className='explore__search-header'>
          <Search />
        </div>

        {isSearching ? (
          <SearchResults />
        ) : (
          <>
            <div className='account__section-headline'>
              <NavLink exact to='/explore'>
                <FormattedMessage tagName='div' id='explore.trending_statuses' defaultMessage='Posts' />
              </NavLink>

              <NavLink exact to='/explore/tags'>
                <FormattedMessage tagName='div' id='explore.trending_tags' defaultMessage='Hashtags' />
              </NavLink>

              {signedIn && (
                <NavLink exact to='/explore/suggestions'>
                  <FormattedMessage tagName='div' id='explore.suggested_follows' defaultMessage='People' />
                </NavLink>
              )}

              <NavLink exact to='/explore/links'>
                <FormattedMessage tagName='div' id='explore.trending_links' defaultMessage='News' />
              </NavLink>
            </div>

            <Switch>
              <Route path='/explore/tags' component={Tags} />
              <Route path='/explore/links' component={Links} />
              <Route path='/explore/suggestions' component={Suggestions} />
              <Route exact path={["/explore", "/explore/posts", "/search"]}>
                <Statuses multiColumn={multiColumn} />
              </Route>
            </Switch>

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

}

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