import React, {
  FC,
  memo,
  useRef,
  useCallback,
  useState,
} from '../../lib/teact/teact';
import { withGlobal } from '../../lib/teact/teactn';

import { GlobalActions, MessageListType } from '../../global/types';
import { MAIN_THREAD_ID } from '../../api/types';
import { IAnchorPosition } from '../../types';

import { IS_SINGLE_COLUMN_LAYOUT } from '../../util/environment';
import { pick } from '../../util/iteratees';
import { isChatChannel, isChatSuperGroup } from '../../modules/helpers';
import {
  selectChat,
  selectChatBot,
  selectIsUserBlocked,
  selectIsChatBotNotStarted,
  selectIsChatWithSelf,
  selectIsInSelectMode,
  selectIsRightColumnShown,
} from '../../modules/selectors';
import useLang from '../../hooks/useLang';

import Button from '../ui/Button';
import HeaderMenuContainer from './HeaderMenuContainer.async';

interface OwnProps {
  chatId: number;
  threadId: number;
  messageListType: MessageListType;
}

interface StateProps {
  noMenu?: boolean;
  isChannel?: boolean;
  isRightColumnShown?: boolean;
  canStartBot?: boolean;
  canRestartBot?: boolean;
  canSubscribe?: boolean;
  canSearch?: boolean;
  canMute?: boolean;
  canSelect?: boolean;
  canLeave?: boolean;
}

type DispatchProps = Pick<GlobalActions, 'joinChannel' | 'sendBotCommand' | 'openLocalTextSearch' | 'restartBot'>;

// Chrome breaks layout when focusing input during transition
const SEARCH_FOCUS_DELAY_MS = 400;

const HeaderActions: FC<OwnProps & StateProps & DispatchProps> = ({
  chatId,
  threadId,
  noMenu,
  isChannel,
  canStartBot,
  canRestartBot,
  canSubscribe,
  canSearch,
  canMute,
  canSelect,
  canLeave,
  isRightColumnShown,
  joinChannel,
  sendBotCommand,
  openLocalTextSearch,
  restartBot,
}) => {
  // eslint-disable-next-line no-null/no-null
  const menuButtonRef = useRef<HTMLButtonElement>(null);
  const [isMenuOpen, setIsMenuOpen] = useState(false);
  const [menuPosition, setMenuPosition] = useState<IAnchorPosition | undefined>(undefined);

  const handleHeaderMenuOpen = useCallback(() => {
    setIsMenuOpen(true);
    const rect = menuButtonRef.current!.getBoundingClientRect();
    setMenuPosition({ x: rect.right, y: rect.bottom });
  }, []);

  const handleHeaderMenuClose = useCallback(() => {
    setIsMenuOpen(false);
  }, []);

  const handleHeaderMenuHide = useCallback(() => {
    setMenuPosition(undefined);
  }, []);

  const handleSubscribeClick = useCallback(() => {
    joinChannel({ chatId });
  }, [joinChannel, chatId]);

  const handleStartBot = useCallback(() => {
    sendBotCommand({ command: '/start' });
  }, [sendBotCommand]);

  const handleRestartBot = useCallback(() => {
    restartBot({ chatId });
  }, [chatId, restartBot]);

  const handleSearchClick = useCallback(() => {
    openLocalTextSearch();

    if (IS_SINGLE_COLUMN_LAYOUT) {
      // iOS requires synchronous focus on user event.
      const searchInput = document.querySelector<HTMLInputElement>('#MobileSearch input')!;
      searchInput.focus();
    } else {
      setTimeout(() => {
        const searchInput = document.querySelector<HTMLInputElement>('.RightHeader .SearchInput input');
        if (searchInput) {
          searchInput.focus();
        }
      }, SEARCH_FOCUS_DELAY_MS);
    }
  }, [openLocalTextSearch]);

  const lang = useLang();

  return (
    <div className="HeaderActions">
      {!IS_SINGLE_COLUMN_LAYOUT && canSubscribe && (
        <Button
          size="tiny"
          ripple
          fluid
          onClick={handleSubscribeClick}
        >
          {lang(isChannel ? 'Subscribe' : 'Join Group')}
        </Button>
      )}
      {!IS_SINGLE_COLUMN_LAYOUT && canStartBot && (
        <Button
          size="tiny"
          ripple
          fluid
          onClick={handleStartBot}
        >
          {lang('BotStart')}
        </Button>
      )}
      {!IS_SINGLE_COLUMN_LAYOUT && canRestartBot && (
        <Button
          size="tiny"
          ripple
          fluid
          onClick={handleRestartBot}
        >
          {lang('BotRestart')}
        </Button>
      )}
      {!IS_SINGLE_COLUMN_LAYOUT && canSearch && (
        <Button
          round
          ripple={isRightColumnShown}
          color="translucent"
          size="smaller"
          onClick={handleSearchClick}
          ariaLabel="Search in this chat"
        >
          <i className="icon-search" />
        </Button>
      )}
      {(IS_SINGLE_COLUMN_LAYOUT || !canSubscribe) && (
        <Button
          ref={menuButtonRef}
          className={isMenuOpen ? 'active' : ''}
          round
          ripple={!IS_SINGLE_COLUMN_LAYOUT}
          size="smaller"
          color="translucent"
          disabled={noMenu}
          ariaLabel="More actions"
          onClick={handleHeaderMenuOpen}
        >
          <i className="icon-more" />
        </Button>
      )}
      {menuPosition && (
        <HeaderMenuContainer
          chatId={chatId}
          threadId={threadId}
          isOpen={isMenuOpen}
          anchor={menuPosition}
          isChannel={isChannel}
          canStartBot={canStartBot}
          canRestartBot={canRestartBot}
          canSubscribe={canSubscribe}
          canSearch={canSearch}
          canMute={canMute}
          canSelect={canSelect}
          canLeave={canLeave}
          onSubscribeChannel={handleSubscribeClick}
          onSearchClick={handleSearchClick}
          onClose={handleHeaderMenuClose}
          onCloseAnimationEnd={handleHeaderMenuHide}
        />
      )}
    </div>
  );
};

export default memo(withGlobal<OwnProps>(
  (global, { chatId, threadId, messageListType }): StateProps => {
    const chat = selectChat(global, chatId);
    const isChannel = Boolean(chat && isChatChannel(chat));

    if (chat && chat.isRestricted) {
      return {
        noMenu: true,
      };
    }

    const bot = selectChatBot(global, chatId);
    const isChatWithSelf = selectIsChatWithSelf(global, chatId);
    const isMainThread = messageListType === 'thread' && threadId === MAIN_THREAD_ID;
    const isDiscussionThread = messageListType === 'thread' && threadId !== MAIN_THREAD_ID;
    const isRightColumnShown = selectIsRightColumnShown(global);

    const canRestartBot = Boolean(bot && selectIsUserBlocked(global, bot.id));
    const canStartBot = !canRestartBot && Boolean(selectIsChatBotNotStarted(global, chatId));
    const canSubscribe = Boolean(
      isMainThread && chat && (isChannel || isChatSuperGroup(chat)) && chat.isNotJoined,
    );
    const canSearch = isMainThread || isDiscussionThread;
    const canMute = isMainThread && !isChatWithSelf && !canSubscribe;
    const canSelect = !selectIsInSelectMode(global);
    const canLeave = isMainThread && !canSubscribe;

    const noMenu = !(
      (IS_SINGLE_COLUMN_LAYOUT && canSubscribe)
      || (IS_SINGLE_COLUMN_LAYOUT && canSearch)
      || canMute
      || canSelect
      || canLeave
    );

    return {
      noMenu,
      isChannel,
      isRightColumnShown,
      canStartBot,
      canRestartBot,
      canSubscribe,
      canSearch,
      canMute,
      canSelect,
      canLeave,
    };
  },
  (setGlobal, actions): DispatchProps => pick(actions, [
    'joinChannel', 'sendBotCommand', 'openLocalTextSearch', 'restartBot',
  ]),
)(HeaderActions));
