import { NextResponse } from "next/server";
import { atomicUpdateRoom } from "@/lib/store";

export async function POST(
  req: Request,
  { params }: { params: Promise<{ id: string }> },
) {
  const { id } = await params;

  try {
    const { userId, restaurantId, action } = await req.json();

    if (!userId || restaurantId == null || !action) {
      return NextResponse.json(
        { error: "userId, restaurantId, and action are required" },
        { status: 400 },
      );
    }

    const rid = String(restaurantId);

    const updated = await atomicUpdateRoom(id, (data) => {
      if (action === "like") {
        if (!data.likes[rid]) {
          data.likes[rid] = [];
        }
        if (!data.likes[rid].includes(userId)) {
          data.likes[rid].push(userId);
        }

        if (
          data.users.length > 1 &&
          data.likes[rid].length === data.users.length
        ) {
          data.match = rid;
        }
      }

      data.swipeCounts[userId] = (data.swipeCounts[userId] ?? 0) + 1;

      return data;
    });

    if (!updated) {
      return NextResponse.json(
        { error: "房间不存在或已过期" },
        { status: 404 },
      );
    }

    return NextResponse.json({
      match: updated.match,
      likeCount: updated.likes[rid]?.length ?? 0,
    });
  } catch (e) {
    console.error("Failed to process swipe:", e);
    return NextResponse.json(
      { error: "操作失败" },
      { status: 500 },
    );
  }
}