import { ChatRoom, createChatRoom, fetchChatRooms } from '@/lib/api';

export async function findOrCreateMemberChat(
  groupId: string,
  memberUserId: string,
  memberName: string,
  currentUserId: string,
  token: string
): Promise<ChatRoom> {
  const response = await fetchChatRooms(groupId, token);
  const rooms = response.rooms ?? [];
  const existing = rooms.find(
    (room) =>
      room.type === 'GROUP' &&
      room.members.length === 2 &&
      room.members.some((member) => member.userId === memberUserId) &&
      room.members.some((member) => member.userId === currentUserId)
  );
  if (existing) return existing;
  return createChatRoom(groupId, memberName, [memberUserId], token);
}

export function roomDisplayLabel(room: ChatRoom, currentUserId: string) {
  if (room.type === 'GENERAL') return room.name;
  if (room.members.length === 2) {
    const other = room.members.find((member) => member.userId !== currentUserId);
    if (other) return other.displayName;
  }
  return room.name;
}