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

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

import { Helmet } from "react-helmet";

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

import { submitSearch, expandSearch } from "mastodon/actions/search";
import { ImmutableHashtag as Hashtag } from "mastodon/components/hashtag";
import { Icon } from "mastodon/components/icon";
import ScrollableList from "mastodon/components/scrollable_list";
import Account from "mastodon/containers/account_container";
import Status from "mastodon/containers/status_container";

import { SearchSection } from "./components/search_section";

const messages = defineMessages({
  title: { id: "search_results.title", defaultMessage: "Search for {q}" },
});

const mapStateToProps = state => ({
  isLoading: state.getIn(["search", "isLoading"]),
  results: state.getIn(["search", "results"]),
  q: state.getIn(["search", "searchTerm"]),
  submittedType: state.getIn(["search", "type"]),
});

const INITIAL_PAGE_LIMIT = 10;
const INITIAL_DISPLAY = 4;

const hidePeek = list => {
  if (list.size > INITIAL_PAGE_LIMIT && list.size % INITIAL_PAGE_LIMIT === 1) {
    return list.skipLast(1);
  } else {
    return list;
  }
};

const renderAccounts = accounts => hidePeek(accounts).map(id => (
  <Account key={id} id={id} />
));

const renderHashtags = hashtags => hidePeek(hashtags).map(hashtag => (
  <Hashtag key={hashtag.get("name")} hashtag={hashtag} />
));

const renderStatuses = statuses => hidePeek(statuses).map(id => (
  <Status key={id} id={id} />
));

class Results extends PureComponent {

  static propTypes = {
    results: ImmutablePropTypes.contains({
      accounts: ImmutablePropTypes.orderedSet,
      statuses: ImmutablePropTypes.orderedSet,
      hashtags: ImmutablePropTypes.orderedSet,
    }),
    isLoading: PropTypes.bool,
    multiColumn: PropTypes.bool,
    dispatch: PropTypes.func.isRequired,
    q: PropTypes.string,
    intl: PropTypes.object,
    submittedType: PropTypes.oneOf(["accounts", "statuses", "hashtags"]),
  };

  state = {
    type: this.props.submittedType || "all",
  };

  static getDerivedStateFromProps(props, state) {
    if (props.submittedType !== state.type) {
      return {
        type: props.submittedType || "all",
      };
    }

    return null;
  }

  handleSelectAll = () => {
    const { submittedType, dispatch } = this.props;

    // If we originally searched for a specific type, we need to resubmit
    // the query to get all types of results
    if (submittedType) {
      dispatch(submitSearch());
    }

    this.setState({ type: "all" });
  };

  handleSelectAccounts = () => {
    const { submittedType, dispatch } = this.props;

    // If we originally searched for something else (but not everything),
    // we need to resubmit the query for this specific type
    if (submittedType !== "accounts") {
      dispatch(submitSearch("accounts"));
    }

    this.setState({ type: "accounts" });
  };

  handleSelectHashtags = () => {
    const { submittedType, dispatch } = this.props;

    // If we originally searched for something else (but not everything),
    // we need to resubmit the query for this specific type
    if (submittedType !== "hashtags") {
      dispatch(submitSearch("hashtags"));
    }

    this.setState({ type: "hashtags" });
  };

  handleSelectStatuses = () => {
    const { submittedType, dispatch } = this.props;

    // If we originally searched for something else (but not everything),
    // we need to resubmit the query for this specific type
    if (submittedType !== "statuses") {
      dispatch(submitSearch("statuses"));
    }

    this.setState({ type: "statuses" });
  };

  handleLoadMoreAccounts = () => this._loadMore("accounts");
  handleLoadMoreStatuses = () => this._loadMore("statuses");
  handleLoadMoreHashtags = () => this._loadMore("hashtags");

  _loadMore (type) {
    const { dispatch } = this.props;
    dispatch(expandSearch(type));
  }

  handleLoadMore = () => {
    const { type } = this.state;

    if (type !== "all") {
      this._loadMore(type);
    }
  };

  render () {
    const { intl, isLoading, q, results } = this.props;
    const { type } = this.state;

    // We request 1 more result than we display so we can tell if there'd be a next page
    const hasMore = type !== "all" ? results.get(type, ImmutableList()).size > INITIAL_PAGE_LIMIT && results.get(type).size % INITIAL_PAGE_LIMIT === 1 : false;

    let filteredResults;

    const accounts = results.get("accounts", ImmutableList());
    const hashtags = results.get("hashtags", ImmutableList());
    const statuses = results.get("statuses", ImmutableList());

    switch(type) {
      case "all":
        filteredResults = (accounts.size + hashtags.size + statuses.size) > 0 ? (
          <>
            {accounts.size > 0 && (
              <SearchSection key='accounts' title={<><Icon id='users' fixedWidth /><FormattedMessage id='search_results.accounts' defaultMessage='Profiles' /></>} onClickMore={this.handleLoadMoreAccounts}>
                {accounts.take(INITIAL_DISPLAY).map(id => <Account key={id} id={id} />)}
              </SearchSection>
            )}

            {hashtags.size > 0 && (
              <SearchSection key='hashtags' title={<><Icon id='hashtag' fixedWidth /><FormattedMessage id='search_results.hashtags' defaultMessage='Hashtags' /></>} onClickMore={this.handleLoadMoreHashtags}>
                {hashtags.take(INITIAL_DISPLAY).map(hashtag => <Hashtag key={hashtag.get("name")} hashtag={hashtag} />)}
              </SearchSection>
            )}

            {statuses.size > 0 && (
              <SearchSection key='statuses' title={<><Icon id='quote-right' fixedWidth /><FormattedMessage id='search_results.statuses' defaultMessage='Posts' /></>} onClickMore={this.handleLoadMoreStatuses}>
                {statuses.take(INITIAL_DISPLAY).map(id => <Status key={id} id={id} />)}
              </SearchSection>
            )}
          </>
        ) : [];
        break;
      case "accounts":
        filteredResults = renderAccounts(accounts);
        break;
      case "hashtags":
        filteredResults = renderHashtags(hashtags);
        break;
      case "statuses":
        filteredResults = renderStatuses(statuses);
        break;
    }

    return (
      <>
        <div className='account__section-headline'>
          <button onClick={this.handleSelectAll} className={type === "all" ? "active" : undefined}><FormattedMessage id='search_results.all' defaultMessage='All' /></button>
          <button onClick={this.handleSelectAccounts} className={type === "accounts" ? "active" : undefined}><FormattedMessage id='search_results.accounts' defaultMessage='Profiles' /></button>
          <button onClick={this.handleSelectHashtags} className={type === "hashtags" ? "active" : undefined}><FormattedMessage id='search_results.hashtags' defaultMessage='Hashtags' /></button>
          <button onClick={this.handleSelectStatuses} className={type === "statuses" ? "active" : undefined}><FormattedMessage id='search_results.statuses' defaultMessage='Posts' /></button>
        </div>

        <div className='explore__search-results' data-nosnippet>
          <ScrollableList
            scrollKey='search-results'
            isLoading={isLoading}
            onLoadMore={this.handleLoadMore}
            hasMore={hasMore}
            emptyMessage={<FormattedMessage id='search_results.nothing_found' defaultMessage='Could not find anything for these search terms' />}
            bindToDocument
          >
            {filteredResults}
          </ScrollableList>
        </div>

        <Helmet>
          <title>{intl.formatMessage(messages.title, { q })}</title>
        </Helmet>
      </>
    );
  }

}

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