import { memo, useMemo } from '../../../lib/teact/teact';
import { getActions } from '../../../global';

import type { ApiChat, ApiTopic } from '../../../api/types';
import type { Signal } from '../../../util/signals';

import buildClassName from '../../../util/buildClassName';
import { getServerTime } from '../../../util/serverTime';
import { isSignal } from '../../../util/signals';
import { formatIntegerCompact } from '../../../util/textFormat';
import { extractCurrentThemeParams } from '../../../util/themeStyle';

import useDerivedState from '../../../hooks/useDerivedState';
import useLang from '../../../hooks/useLang';
import useLastCallback from '../../../hooks/useLastCallback';

import AnimatedCounter from '../../common/AnimatedCounter';
import Icon from '../../common/icons/Icon';
import Button from '../../ui/Button';
import ShowTransition from '../../ui/ShowTransition';

import styles from './ChatBadge.module.scss';

type OwnProps = {
  chat: ApiChat;
  topic?: ApiTopic;
  wasTopicOpened?: boolean;
  isPinned?: boolean;
  isMuted?: boolean;
  isSavedDialog?: boolean;
  shouldShowOnlyMostImportant?: boolean;
  hasMiniApp?: boolean;
  forceHidden?: boolean | Signal<boolean>;
  topics?: Record<number, ApiTopic>;
  isSelected?: boolean;
  isOnAvatar?: boolean;
  transitionClassName?: string;
  badgeClassName?: string;
};

const ChatBadge = ({
  topic,
  topics,
  chat,
  isPinned,
  isMuted,
  shouldShowOnlyMostImportant,
  wasTopicOpened,
  forceHidden,
  isSavedDialog,
  hasMiniApp,
  isSelected,
  isOnAvatar,
  transitionClassName,
  badgeClassName,
}: OwnProps) => {
  const { requestMainWebView } = getActions();

  const lang = useLang();

  const {
    unreadMentionsCount = 0, unreadReactionsCount = 0,
  } = !chat.isForum ? chat : {}; // TODO[forums] Unread mentions and reactions temporarily disabled for forums

  const isTopicUnopened = !isPinned && topic && !wasTopicOpened;
  const isForum = chat.isForum && !topic;
  const topicsWithUnread = useMemo(() => (
    isForum && topics ? Object.values(topics).filter(({ unreadCount }) => unreadCount) : undefined
  ), [topics, isForum]);

  const unreadCount = useMemo(() => {
    if (!isForum) {
      return (topic || chat).unreadCount;
    }

    return topicsWithUnread?.length;
  }, [chat, topic, topicsWithUnread, isForum]);

  const shouldBeUnMuted = useMemo(() => {
    if (!isForum) {
      return !isMuted || topic?.notifySettings.mutedUntil === 0;
    }

    if (isMuted) {
      return topicsWithUnread?.some((acc) => acc.notifySettings.mutedUntil === 0);
    }

    const isEveryUnreadMuted = topicsWithUnread?.every((acc) => (
      acc.notifySettings.mutedUntil && acc.notifySettings.mutedUntil > getServerTime()
    ));

    return !isEveryUnreadMuted;
  }, [isForum, isMuted, topicsWithUnread, topic?.notifySettings.mutedUntil]);

  const hasUnreadMark = topic ? false : chat.hasUnreadMark;
  const isUnread = Boolean((unreadCount || hasUnreadMark) && !isSavedDialog);

  const resolvedForceHidden = useDerivedState(
    () => (isSignal(forceHidden) ? forceHidden() : forceHidden),
    [forceHidden],
  );
  const isShown = !resolvedForceHidden && Boolean(
    unreadCount || unreadMentionsCount || hasUnreadMark || isPinned || unreadReactionsCount
    || isTopicUnopened || hasMiniApp,
  );

  const handleOpenApp = useLastCallback((e: React.MouseEvent<HTMLButtonElement, MouseEvent>) => {
    e.stopPropagation();

    const theme = extractCurrentThemeParams();
    requestMainWebView({
      botId: chat.id,
      peerId: chat.id,
      theme,
    });
  });

  function renderContent() {
    const baseClassName = buildClassName(styles.badge, !shouldBeUnMuted && styles.muted, badgeClassName);

    const unreadReactionsElement = unreadReactionsCount && (
      <div className={buildClassName(baseClassName, styles.reaction, styles.round)}>
        <Icon name="heart" />
      </div>
    );

    const unreadMentionsElement = unreadMentionsCount && (
      <div className={buildClassName(baseClassName, styles.mention, styles.round)}>
        <Icon name="mention" />
      </div>
    );

    const unopenedTopicElement = isTopicUnopened && (
      <div className={buildClassName(baseClassName, styles.unopened)} />
    );

    const unreadCountElement = isUnread ? (
      <div className={buildClassName(baseClassName, styles.unread)}>
        {!hasUnreadMark && <AnimatedCounter text={formatIntegerCompact(lang, unreadCount!)} />}
      </div>
    ) : undefined;

    const pinnedElement = isPinned && (
      <div className={buildClassName(baseClassName, styles.pinned)}>
        <Icon name="pinned-chat" />
      </div>
    );

    const miniAppButton = hasMiniApp && (
      <Button
        color={isSelected ? 'secondary' : 'primary'}
        className={buildClassName(baseClassName, styles.miniapp)}
        pill
        size="tiny"
        onClick={handleOpenApp}
      >
        {lang('BotChatMiniAppOpen')}
      </Button>
    );

    const visiblePinnedElement = !unreadCountElement && !unreadMentionsElement && !unreadReactionsElement
      && pinnedElement;

    const elements = [
      unopenedTopicElement, unreadReactionsElement, unreadMentionsElement, unreadCountElement, visiblePinnedElement,
    ].filter(Boolean);

    if (isSavedDialog) return pinnedElement;

    // Show only if empty or have pinned icon
    if (hasMiniApp && (elements.length === 0 || visiblePinnedElement)) return miniAppButton;

    if (elements.length === 0) return undefined;

    if (elements.length === 1) return elements[0];

    if (shouldShowOnlyMostImportant) {
      const importanceOrderedElements = [
        unreadMentionsElement, unreadCountElement, unreadReactionsElement, pinnedElement,
      ].filter(Boolean);
      return importanceOrderedElements[0];
    }

    return (
      <div className={styles.wrapper}>
        {elements}
      </div>
    );
  }

  return (
    <ShowTransition
      isCustom
      className={buildClassName(
        styles.transition,
        isSelected && styles.selected,
        isOnAvatar && styles.onAvatar,
        transitionClassName,
      )}
      isOpen={isShown}
    >
      {renderContent()}
    </ShowTransition>
  );
};

export default memo(ChatBadge);