'use client';

import Link from 'next/link';
import { useEffect, useMemo, useState } from 'react';
import { Loader2, Pin, Search, UsersRound } from 'lucide-react';
import { AvatarWithPresence } from '@/components/family/avatar-with-presence';
import { FamilyGroupSelector } from '@/components/family/family-group-selector';
import { FamilyInviteDialog } from '@/components/family/family-invite-dialog';
import { useFamilyOverlay } from '@/components/family/family-overlay-provider';
import { useAuth } from '@/components/id/auth-provider';
import { useSelectedFamily } from '@/hooks/use-primary-family';
import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils';
import { ChatRoom, fetchChatRooms, getApiErrorMessage, setChatRoomPinned } from '@/lib/api';
import { useToast } from '@/components/id/toast-provider';

export function FamilySidebarPanel() {
  const { user, token } = useAuth();
  const {
    group,
    groupSummaries,
    loading,
    hasFamily,
    selectedGroupId,
    setSelectedGroupId,
    presenceByUserId,
    refresh
  } = useSelectedFamily(Boolean(user && token));
  const { openChatWithMember } = useFamilyOverlay();
  const { showToast } = useToast();
  const [inviteOpen, setInviteOpen] = useState(false);
  const [rooms, setRooms] = useState<ChatRoom[]>([]);
  const [pinningRoomId, setPinningRoomId] = useState<string | null>(null);
  const currentUserId = user?.id ?? '';

  useEffect(() => {
    if (!group?.id || !token) {
      setRooms([]);
      return;
    }
    fetchChatRooms(group.id, token)
      .then((response) => setRooms(response.rooms ?? []))
      .catch(() => setRooms([]));
  }, [group?.id, token]);

  const roomByPeerUserId = useMemo(() => {
    const map = new Map<string, ChatRoom>();
    for (const room of rooms) {
      if (room.type !== 'DIRECT' && room.type !== 'BOT' && room.type !== 'E2E') continue;
      const peer = room.members.find((member) => member.userId !== currentUserId);
      if (peer) map.set(peer.userId, room);
    }
    return map;
  }, [currentUserId, rooms]);

  const sortedMembers = useMemo(() => {
    return [...(group?.members ?? [])].sort((left, right) => {
      const leftRoom = roomByPeerUserId.get(left.userId);
      const rightRoom = roomByPeerUserId.get(right.userId);
      const pinDiff = Number(Boolean(rightRoom?.isPinned)) - Number(Boolean(leftRoom?.isPinned));
      if (pinDiff !== 0) return pinDiff;
      if (leftRoom?.isPinned && rightRoom?.isPinned) {
        return (rightRoom.pinnedAt ?? '').localeCompare(leftRoom.pinnedAt ?? '');
      }
      if (left.userId === currentUserId) return -1;
      if (right.userId === currentUserId) return 1;
      return left.displayName.localeCompare(right.displayName, 'ru');
    });
  }, [currentUserId, group?.members, roomByPeerUserId]);

  async function toggleMemberPinned(memberUserId: string) {
    const room = roomByPeerUserId.get(memberUserId);
    if (!room || !token) {
      showToast('Откройте чат с участником, чтобы его можно было закрепить');
      return;
    }
    setPinningRoomId(room.id);
    try {
      const updated = await setChatRoomPinned(room.id, !room.isPinned, token);
      setRooms((current) => current.map((item) => (item.id === updated.id ? updated : item)));
      showToast(updated.isPinned ? 'Чат закреплён' : 'Чат откреплён');
    } catch (error) {
      showToast(getApiErrorMessage(error, 'Не удалось закрепить чат') ?? 'Ошибка');
    } finally {
      setPinningRoomId(null);
    }
  }

  if (!user || !token) return null;

  return (
    <>
      <div className="mt-5 border-t border-[#eceef4] pt-4">
        <div className="mb-2 flex items-center justify-between gap-1">
          <div className="min-w-0">
            <p className="truncate text-[11px] font-semibold uppercase tracking-wide text-[#667085]">Семья</p>
            {hasFamily ? (
              <FamilyGroupSelector
                groups={groupSummaries}
                selectedGroupId={selectedGroupId}
                onSelect={setSelectedGroupId}
                href={`/family/${group!.id}`}
                nameClassName="text-xs font-medium text-[#1f2430]"
              />
            ) : (
              <Link href="/family" className="text-xs font-medium text-[#3390ec] hover:underline">
                Создать семью
              </Link>
            )}
          </div>
          {hasFamily ? (
            <Button
              type="button"
              variant="ghost"
              size="icon"
              className="h-7 w-7 shrink-0 rounded-lg"
              aria-label="Найти и пригласить"
              onClick={() => setInviteOpen(true)}
            >
              <Search className="h-3.5 w-3.5" />
            </Button>
          ) : null}
        </div>

        {loading ? (
          <div className="flex items-center gap-2 py-2 text-[11px] text-[#667085]">
            <Loader2 className="h-3.5 w-3.5 animate-spin" />
            Загрузка...
          </div>
        ) : hasFamily ? (
          <div className="space-y-1 overflow-y-auto pr-1">
            {sortedMembers.map((member) => {
              const presence = presenceByUserId.get(member.userId);
              const isSelf = member.userId === currentUserId;
              const memberRoom = roomByPeerUserId.get(member.userId);
              const memberPinned = Boolean(memberRoom?.isPinned);
              return (
                <div
                  key={member.id}
                  className={cn(
                    'flex w-full items-center gap-1 rounded-xl transition hover:bg-[#f4f5f8]',
                    isSelf && 'bg-[#fafbfd]'
                  )}
                >
                  <button
                    type="button"
                    className="flex min-w-0 flex-1 items-center gap-2 px-2 py-1.5 text-left"
                    onClick={() => openChatWithMember(member.userId, member.displayName, {
                      isBot: member.isBot,
                      botUsername: member.botUsername
                    })}
                    title={isSelf ? 'Вы' : `Написать ${member.displayName}`}
                  >
                    <AvatarWithPresence
                      userId={member.userId}
                      displayName={member.displayName}
                      hasAvatar={member.hasAvatar}
                      token={token}
                      isVerified={member.isVerified}
                      verificationIcon={member.verificationIcon}
                      online={isSelf ? undefined : presence?.online}
                      className="h-8 w-8"
                    />
                    <div className="min-w-0 flex-1">
                      <p className="flex min-w-0 items-center gap-1 truncate text-[12px] font-medium leading-tight">
                        <span className="truncate">{member.displayName}</span>
                        {member.isBot ? <span>🤖</span> : null}
                        {isSelf ? <span>(Вы)</span> : null}
                        {memberPinned ? <Pin className="h-3 w-3 shrink-0 fill-[#8a8f9e] text-[#8a8f9e]" /> : null}
                      </p>
                      {!isSelf ? (
                        <p className={cn('truncate text-[10px]', member.isBot ? 'text-[#3390ec]' : presence?.online ? 'text-emerald-600' : 'text-[#a8adbc]')}>
                          {member.isBot ? 'Бот' : presence?.online ? 'В сети' : 'Не в сети'}
                        </p>
                      ) : null}
                    </div>
                  </button>
                  {!isSelf ? (
                    <button
                      type="button"
                      aria-label={memberPinned ? 'Открепить чат' : 'Закрепить чат'}
                      className="mr-1 flex h-7 w-7 shrink-0 items-center justify-center rounded-lg text-[#8a8f9e] transition hover:bg-[#eceef4] hover:text-[#667085]"
                      onClick={() => void toggleMemberPinned(member.userId)}
                    >
                      {pinningRoomId === memberRoom?.id ? (
                        <Loader2 className="h-3.5 w-3.5 animate-spin" />
                      ) : (
                        <Pin className={cn('h-3.5 w-3.5', memberPinned && 'fill-[#8a8f9e]')} />
                      )}
                    </button>
                  ) : null}
                </div>
              );
            })}
          </div>
        ) : (
          <div className="rounded-xl bg-[#f4f5f8] px-2 py-3 text-[11px] text-[#667085]">
            <UsersRound className="mb-1 h-4 w-4" />
            Приглашайте близких и общайтесь в чатах
          </div>
        )}
      </div>

      {hasFamily ? (
        <FamilyInviteDialog
          groupId={group!.id}
          group={group}
          open={inviteOpen}
          onOpenChange={setInviteOpen}
          onInvited={() => void refresh()}
        />
      ) : null}
    </>
  );
}
