import { NextResponse } from 'next/server';
import {
  allowChannelIdJoin,
  isChzzkOAuthConfigured,
  requireChzzkLoginForChannelRooms,
} from '@/lib/auth/mode';
import { readAuthSession, type AuthSession } from '@/lib/auth/session';
import type { RoomRecord } from '@/lib/rooms/store';

export async function getRequestAuthSession(
  request?: Request,
): Promise<AuthSession | null> {
  // Route Handler에서는 cookies()가 기본. request Cookie 헤더도 보조 파싱.
  const fromCookies = await readAuthSession();
  if (fromCookies) return fromCookies;
  if (!request) return null;
  const header = request.headers.get('cookie') || '';
  const match = /(?:^|;\s*)drinkmarble_auth=([^;]+)/.exec(header);
  if (!match?.[1]) return null;
  const { parseAuthSession } = await import('@/lib/auth/session');
  return parseAuthSession(decodeURIComponent(match[1]));
}

/**
 * 치지직 연동 룸 접근 검사.
 * - 개발(채널 ID 허용): 세션 없어도 OK
 * - 릴리즈: 세션의 channelId가 룸 채널과 일치해야 함
 */
export async function assertChannelRoomAccess(
  room: RoomRecord,
  request?: Request,
): Promise<{ ok: true; session: AuthSession | null } | { ok: false; response: NextResponse }> {
  if (!room.settings.chzzkEnabled) {
    return { ok: true, session: null };
  }

  if (!requireChzzkLoginForChannelRooms()) {
    return { ok: true, session: await getRequestAuthSession(request) };
  }

  const session = await getRequestAuthSession(request);
  const roomChannel = room.settings.channelId?.toLowerCase() || '';
  if (!session || !roomChannel || session.channelId !== roomChannel) {
    return {
      ok: false,
      response: NextResponse.json(
        {
          error:
            '릴리즈 환경에서는 치지직 로그인으로 본인 채널만 입장할 수 있습니다. 홈에서 다시 로그인해 주세요.',
          code: 'CHZZK_AUTH_REQUIRED',
          allowChannelIdJoin: allowChannelIdJoin(),
          oauthConfigured: isChzzkOAuthConfigured(),
        },
        { status: 401 },
      ),
    };
  }
  return { ok: true, session };
}

export function authModePublic() {
  return {
    allowChannelIdJoin: allowChannelIdJoin(),
    requireChzzkLogin: requireChzzkLoginForChannelRooms(),
    oauthConfigured: isChzzkOAuthConfigured(),
    nodeEnv: process.env.NODE_ENV,
  };
}