import type { FC } from '../../../lib/teact/teact';
import { memo, useMemo } from '../../../lib/teact/teact';
import { getActions, getGlobal, withGlobal } from '../../../global';

import type { ApiChat, ApiChatMember } from '../../../api/types';
import { ManagementScreens } from '../../../types';

import { getHasAdminRight, getUserFullName, isChatChannel } from '../../../global/helpers';
import { selectChat, selectChatFullInfo } from '../../../global/selectors';
import { partition } from '../../../util/iteratees';

import useHistoryBack from '../../../hooks/useHistoryBack';
import useLastCallback from '../../../hooks/useLastCallback';
import useOldLang from '../../../hooks/useOldLang';

import Icon from '../../common/icons/Icon';
import PrivateChatInfo from '../../common/PrivateChatInfo';
import Checkbox from '../../ui/Checkbox';
import FloatingActionButton from '../../ui/FloatingActionButton';
import ListItem from '../../ui/ListItem';

type OwnProps = {
  chatId: string;
  isActive: boolean;
  onScreenSelect: (screen: ManagementScreens) => void;
  onChatMemberSelect: (memberId: string, isPromotedByCurrentUser?: boolean) => void;
  onClose: NoneToVoidFunction;
};

type StateProps = {
  chat?: ApiChat;
  currentUserId?: string;
  isChannel?: boolean;
  adminMembersById?: Record<string, ApiChatMember>;
};

const ManageChatAdministrators: FC<OwnProps & StateProps> = ({
  isActive,
  chat,
  isChannel,
  currentUserId,
  adminMembersById,
  onScreenSelect,
  onChatMemberSelect,
  onClose,
}) => {
  const { toggleSignatures } = getActions();
  const lang = useOldLang();

  useHistoryBack({
    isActive,
    onBack: onClose,
  });

  const areSignaturesEnabled = Boolean(chat?.areSignaturesShown);
  const areProfilesEnabled = Boolean(chat?.areProfilesShown);

  const canAddNewAdmins = Boolean(chat?.isCreator || (chat && getHasAdminRight(chat, 'addAdmins')));
  const canToggleSignatures = isChannel && getHasAdminRight(chat!, 'postMessages');

  const adminMembers = useMemo(() => {
    if (!adminMembersById) {
      return [];
    }

    const [owner, admins] = partition(Object.values(adminMembersById), (member) => member.isOwner);

    return [...owner, ...admins];
  }, [adminMembersById]);

  const handleAdminMemberClick = useLastCallback((member: ApiChatMember) => {
    onChatMemberSelect(member.userId, member.promotedByUserId === currentUserId);
    onScreenSelect(ManagementScreens.ChatAdminRights);
  });

  const handleToggleSignatures = useLastCallback(() => {
    toggleSignatures({
      chatId: chat!.id,
      areProfilesEnabled,
      areSignaturesEnabled: !areSignaturesEnabled,
    });
  });

  const handleToggleProfiles = useLastCallback(() => {
    toggleSignatures({
      chatId: chat!.id,
      areProfilesEnabled: !areProfilesEnabled,
      areSignaturesEnabled,
    });
  });

  const handleAddAdminClick = useLastCallback(() => {
    onScreenSelect(ManagementScreens.GroupAddAdmins);
  });

  const getMemberStatus = useLastCallback((member: ApiChatMember) => {
    if (member.isOwner) {
      return lang('ChannelCreator');
    }

    // No need for expensive global updates on users, so we avoid them
    const usersById = getGlobal().users.byId;
    const promotedByUser = member.promotedByUserId ? usersById[member.promotedByUserId] : undefined;

    if (promotedByUser) {
      return lang('EditAdminPromotedBy', getUserFullName(promotedByUser));
    }

    return lang('ChannelAdmin');
  });

  return (
    <div className="Management">
      <div className="panel-content custom-scroll">
        <div className="section">
          <ListItem
            icon="recent"
            multiline
            disabled
          >
            <span className="title">{lang('EventLog')}</span>
            <span className="subtitle">{lang(isChannel ? 'EventLogInfoDetailChannel' : 'EventLogInfoDetail')}</span>
          </ListItem>
        </div>

        <div className="section" dir={lang.isRtl ? 'rtl' : undefined}>
          <p className="section-help" dir="auto">
            {lang(isChannel
              ? 'Channel.Management.AddModeratorHelp'
              : 'Group.Management.AddModeratorHelp')}
          </p>

          {adminMembers.map((member) => (
            <ListItem
              key={member.userId}
              className="chat-item-clickable"

              onClick={() => handleAdminMemberClick(member)}
            >
              <PrivateChatInfo
                userId={member.userId}
                status={getMemberStatus(member)}
                forceShowSelf
              />
            </ListItem>
          ))}

          <FloatingActionButton
            isShown={canAddNewAdmins}
            onClick={handleAddAdminClick}
            ariaLabel={lang('Channel.Management.AddModerator')}
          >
            <Icon name="add-user-filled" />
          </FloatingActionButton>
        </div>

        {canToggleSignatures && (
          <div className="section">
            <div className="ListItem narrow">
              <Checkbox
                checked={areSignaturesEnabled}
                label={lang('ChannelSignMessages')}
                onChange={handleToggleSignatures}
              />
            </div>
            {areSignaturesEnabled && (
              <>
                <div className="ListItem narrow">
                  <Checkbox
                    checked={areProfilesEnabled}
                    label={lang('ChannelSignMessagesWithProfile')}
                    onChange={handleToggleProfiles}
                  />
                </div>
                <p className="section-info section-info_push">
                  {lang('ChannelSignProfilesInfo')}
                </p>
              </>
            )}
          </div>
        )}
      </div>
    </div>
  );
};

export default memo(withGlobal<OwnProps>(
  (global, { chatId }): Complete<StateProps> => {
    const chat = selectChat(global, chatId);
    return {
      chat,
      currentUserId: global.currentUserId,
      isChannel: chat && isChatChannel(chat),
      adminMembersById: selectChatFullInfo(global, chatId)?.adminMembersById,
    };
  },
)(ManageChatAdministrators));