import { NextResponse } from 'next/server';
import { isChzzkOAuthConfigured } from '@/lib/auth/mode';
import {
  createOAuthState,
  OAUTH_STATE_COOKIE,
  authCookieOptions,
} from '@/lib/auth/session';
import { buildChzzkLoginUrl } from '@/lib/chzzk/oauth';

export const runtime = 'nodejs';

/**
 * 치지직 로그인 시작.
 * 쿼리로 치즈 설정을 넘기면 콜백에서 바로 룸 입장에 사용한다.
 */
export async function GET(request: Request) {
  if (!isChzzkOAuthConfigured()) {
    return NextResponse.json(
      {
        error:
          '치지직 OAuth가 설정되지 않았습니다. CHZZK_CLIENT_ID / CHZZK_CLIENT_SECRET / CHZZK_REDIRECT_URI 를 확인해 주세요.',
      },
      { status: 503 },
    );
  }

  const url = new URL(request.url);
  const cheesePerDice = Number(url.searchParams.get('cheesePerDice') || 1000);
  const multiplyByCheese = url.searchParams.get('multiplyByCheese') !== '0';
  const maxMultiplier = Number(url.searchParams.get('maxMultiplier') || 0);
  const resetDiceQueue = url.searchParams.get('resetDiceQueue') === '1';

  const { state, sealed } = createOAuthState({
    cheesePerDice: Number.isFinite(cheesePerDice) ? cheesePerDice : 1000,
    multiplyByCheese,
    maxMultiplier: Number.isFinite(maxMultiplier) ? maxMultiplier : 0,
    resetDiceQueue,
  });

  const res = NextResponse.redirect(buildChzzkLoginUrl(state));
  res.cookies.set(OAUTH_STATE_COOKIE, sealed, {
    ...authCookieOptions(600),
    maxAge: 600,
  });
  return res;
}