fix: 修复竞态条件、重置逻辑、无匹配终态等关键问题

- 用 Prisma $transaction 实现 atomicUpdateRoom，防止并发写入覆盖
- 新增 POST /api/room/[id]/reset 端点，修复"再来一轮"按钮死循环
- 新增 swipeCounts 字段追踪滑动进度，检测"无人匹配"终态
- 着陆页 handleCreate 增加 res.ok 检查，防止跳转到无效房间
- 匹配或无匹配后停止轮询，减少无效请求

src/app/api/room/[id]/join/route.ts

@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { getRoomData, updateRoomData } from "@/lib/store";
+import { atomicUpdateRoom } from "@/lib/store";
 
 export async function POST(
   req: Request,
@@ -8,28 +8,28 @@ export async function POST(
   const { id } = await params;
 
   try {
-    const data = await getRoomData(id);
+    const { userId } = await req.json();
+    if (!userId) {
+      return NextResponse.json({ error: "userId required" }, { status: 400 });
+    }
 
-    if (!data) {
+    const updated = await atomicUpdateRoom(id, (data) => {
+      if (!data.users.includes(userId)) {
+        data.users.push(userId);
+      }
+      return data;
+    });
+
+    if (!updated) {
       return NextResponse.json(
         { error: "房间不存在或已过期" },
         { status: 404 },
       );
     }
 
-    const { userId } = await req.json();
-    if (!userId) {
-      return NextResponse.json({ error: "userId required" }, { status: 400 });
-    }
-
-    if (!data.users.includes(userId)) {
-      data.users.push(userId);
-      await updateRoomData(id, data);
-    }
-
     return NextResponse.json({
       roomId: id,
-      userCount: data.users.length,
+      userCount: updated.users.length,
     });
   } catch (e) {
     console.error("Failed to join room:", e);

src/app/api/room/[id]/reset/route.ts

@@ -0,0 +1,33 @@
+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 updated = await atomicUpdateRoom(id, (data) => {
+      data.likes = {};
+      data.swipeCounts = {};
+      data.match = null;
+      return data;
+    });
+
+    if (!updated) {
+      return NextResponse.json(
+        { error: "房间不存在或已过期" },
+        { status: 404 },
+      );
+    }
+
+    return NextResponse.json({ ok: true });
+  } catch (e) {
+    console.error("Failed to reset room:", e);
+    return NextResponse.json(
+      { error: "重置失败" },
+      { status: 500 },
+    );
+  }
+}

src/app/api/room/[id]/route.ts

@@ -17,10 +17,17 @@ export async function GET(
       );
     }
 
+    const total = data.restaurants.length;
+    const allFinished =
+      data.users.length > 0 &&
+      data.users.every((u) => (data.swipeCounts[u] ?? 0) >= total);
+    const noMatch = allFinished && data.match === null;
+
     return NextResponse.json({
       roomId: id,
       userCount: data.users.length,
       match: data.match,
+      noMatch,
       restaurants: data.restaurants,
     });
   } catch (e) {

src/app/api/room/[id]/swipe/route.ts

@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { getRoomData, updateRoomData } from "@/lib/store";
+import { atomicUpdateRoom } from "@/lib/store";
 
 export async function POST(
   req: Request,
@@ -8,15 +8,6 @@ export async function POST(
   const { id } = await params;
 
   try {
-    const data = await getRoomData(id);
-
-    if (!data) {
-      return NextResponse.json(
-        { error: "房间不存在或已过期" },
-        { status: 404 },
-      );
-    }
-
     const { userId, restaurantId, action } = await req.json();
 
     if (!userId || restaurantId == null || !action) {
@@ -27,15 +18,14 @@ export async function POST(
     }
 
     const rid = String(restaurantId);
-    let dirty = false;
 
+    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);
-        dirty = true;
         }
 
         if (
@@ -43,17 +33,24 @@ export async function POST(
           data.likes[rid].length === data.users.length
         ) {
           data.match = rid;
-        dirty = true;
         }
       }
 
-    if (dirty) {
-      await updateRoomData(id, data);
+      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: data.match,
-      likeCount: data.likes[rid]?.length ?? 0,
+      match: updated.match,
+      likeCount: updated.likes[rid]?.length ?? 0,
     });
   } catch (e) {
     console.error("Failed to process swipe:", e);

src/app/page.tsx

@@ -61,7 +61,15 @@ export default function LandingPage() {
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify(coords),
       });
+
+      if (!res.ok) {
+        throw new Error("创建房间失败");
+      }
+
       const { roomId } = await res.json();
+      if (!roomId) {
+        throw new Error("创建房间失败");
+      }
 
       setLoadingText("正在进入房间...");
       await joinRoom(roomId);

src/app/room/[id]/page.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import { useEffect, useState, useCallback } from "react";
 import { useParams } from "next/navigation";
 import TopNav from "@/components/TopNav";
 import SwipeDeck from "@/components/SwipeDeck";
@@ -14,7 +14,8 @@ export default function RoomPage() {
   const [userId, setUserId] = useState("");
   const [joined, setJoined] = useState(false);
 
-  const { userCount, match, restaurants } = useRoomPolling(roomId);
+  const { userCount, match, noMatch, restaurants, mutate } =
+    useRoomPolling(roomId);
 
   useEffect(() => {
     const id = getUserId();
@@ -27,6 +28,11 @@ export default function RoomPage() {
     }).then(() => setJoined(true));
   }, [roomId]);
 
+  const handleReset = useCallback(async () => {
+    await fetch(`/api/room/${roomId}/reset`, { method: "POST" });
+    await mutate();
+  }, [roomId, mutate]);
+
   const ready = joined && userId && restaurants.length > 0;
 
   if (!ready) {
@@ -46,6 +52,8 @@ export default function RoomPage() {
         roomId={roomId}
         userId={userId}
         matchedRestaurantId={match}
+        noMatch={noMatch}
+        onReset={handleReset}
       />
     </div>
   );

src/components/MatchResult.tsx

@@ -13,7 +13,7 @@ import { Restaurant } from "@/types";
 
 interface MatchResultProps {
   restaurant: Restaurant;
-  onReset: () => void;
+  onReset: () => Promise<void>;
 }
 
 function buildNavUrl(restaurant: Restaurant): string {

src/components/SwipeDeck.tsx

@@ -1,17 +1,20 @@
 "use client";
 
 import { useState, useCallback, useRef, useEffect } from "react";
-import { AnimatePresence } from "framer-motion";
+import { AnimatePresence, motion } from "framer-motion";
 import SwipeableCard from "./SwipeableCard";
 import ActionButtons from "./ActionButtons";
 import MatchResult from "./MatchResult";
 import { Restaurant, SwipeDirection } from "@/types";
+import { Frown, RotateCcw } from "lucide-react";
 
 interface SwipeDeckProps {
   restaurants: Restaurant[];
   roomId: string;
   userId: string;
   matchedRestaurantId: string | null;
+  noMatch: boolean;
+  onReset: () => Promise<void>;
 }
 
 export default function SwipeDeck({
@@ -19,20 +22,23 @@ export default function SwipeDeck({
   roomId,
   userId,
   matchedRestaurantId,
+  noMatch,
+  onReset,
 }: SwipeDeckProps) {
   const [currentIndex, setCurrentIndex] = useState(0);
   const [showMatch, setShowMatch] = useState(false);
   const [localMatchId, setLocalMatchId] = useState<string | null>(null);
+  const [resetting, setResetting] = useState(false);
   const swipeFnRef = useRef<((direction: SwipeDirection) => void) | null>(null);
   const swipingRef = useRef(false);
 
   const resolvedMatchId = matchedRestaurantId ?? localMatchId;
 
   useEffect(() => {
-    if (matchedRestaurantId != null && !showMatch) {
+    if (resolvedMatchId != null && !showMatch) {
       setShowMatch(true);
     }
-  }, [matchedRestaurantId, showMatch]);
+  }, [resolvedMatchId, showMatch]);
 
   const registerSwipe = useCallback(
     (fn: (direction: SwipeDirection) => void) => {
@@ -70,15 +76,9 @@ export default function SwipeDeck({
       const nextIndex = currentIndex + 1;
       setCurrentIndex(nextIndex);
       swipeFnRef.current = null;
-
-      if (nextIndex >= restaurants.length && !resolvedMatchId) {
-        setTimeout(() => {
-          if (!showMatch) setShowMatch(true);
-        }, 300);
-      }
     },
     // eslint-disable-next-line react-hooks/exhaustive-deps
-    [currentIndex, restaurants, roomId, userId, resolvedMatchId, showMatch],
+    [currentIndex, restaurants, roomId, userId],
   );
 
   const handleButtonAction = useCallback(
@@ -91,26 +91,32 @@ export default function SwipeDeck({
     [],
   );
 
-  const handleReset = useCallback(() => {
+  const handleReset = useCallback(async () => {
+    setResetting(true);
+    try {
+      await onReset();
       setCurrentIndex(0);
       setShowMatch(false);
       setLocalMatchId(null);
-  }, []);
+    } finally {
+      setResetting(false);
+    }
+  }, [onReset]);
 
-  const isDone = currentIndex >= restaurants.length || resolvedMatchId != null;
+  const allSwiped = currentIndex >= restaurants.length;
+  const isDone = allSwiped || resolvedMatchId != null;
 
   const matchRestaurant = resolvedMatchId
-    ? restaurants.find((r) => r.id === resolvedMatchId) ?? restaurants[0]
-    : restaurants[0];
+    ? restaurants.find((r) => r.id === resolvedMatchId) ?? null
+    : null;
 
-  const showWaiting =
-    currentIndex >= restaurants.length && !resolvedMatchId && !showMatch;
+  const showWaiting = allSwiped && !resolvedMatchId && !noMatch;
 
   return (
     <>
       <div className="relative flex flex-1 items-center justify-center px-4">
         <div className="relative h-[70vh] w-full max-w-sm">
-          {!resolvedMatchId && (
+          {!resolvedMatchId && !noMatch && (
             <AnimatePresence>
               {restaurants.map((restaurant, index) => {
                 if (index < currentIndex || index > currentIndex + 1)
@@ -135,10 +141,36 @@ export default function SwipeDeck({
               <p className="text-sm text-zinc-400">等待其他人完成选择...</p>
             </div>
           )}
+
+          {noMatch && !showMatch && (
+            <motion.div
+              className="flex h-full flex-col items-center justify-center gap-4"
+              initial={{ opacity: 0, y: 20 }}
+              animate={{ opacity: 1, y: 0 }}
+            >
+              <div className="flex h-16 w-16 items-center justify-center rounded-full bg-zinc-100">
+                <Frown size={32} className="text-zinc-400" />
+              </div>
+              <div className="text-center">
+                <p className="text-lg font-bold text-zinc-700">没有达成共识</p>
+                <p className="mt-1 text-sm text-zinc-400">
+                  大家口味不太一样，换一批试试？
+                </p>
+              </div>
+              <button
+                onClick={handleReset}
+                disabled={resetting}
+                className="mt-2 flex items-center gap-2 rounded-xl bg-emerald-500 px-6 py-2.5 text-sm font-bold text-white shadow-md shadow-emerald-200 transition-colors hover:bg-emerald-600 disabled:opacity-50"
+              >
+                <RotateCcw size={16} className={resetting ? "animate-spin" : ""} />
+                {resetting ? "重置中..." : "再来一轮"}
+              </button>
+            </motion.div>
+          )}
         </div>
       </div>
 
-      <ActionButtons onAction={handleButtonAction} disabled={isDone} />
+      <ActionButtons onAction={handleButtonAction} disabled={isDone || noMatch} />
 
       {showMatch && matchRestaurant && (
         <MatchResult restaurant={matchRestaurant} onReset={handleReset} />

src/hooks/useRoomPolling.ts

@@ -1,22 +1,36 @@
 "use client";
 
 import useSWR from "swr";
+import { useRef } from "react";
 import { RoomStatus } from "@/types";
 
 const fetcher = (url: string) => fetch(url).then((r) => r.json());
 
 export function useRoomPolling(roomId: string) {
-  const { data, error, isLoading } = useSWR<RoomStatus>(
+  const settled = useRef(false);
+
+  const { data, error, isLoading, mutate } = useSWR<RoomStatus>(
     `/api/room/${roomId}`,
     fetcher,
-    { refreshInterval: 1500, revalidateOnFocus: true },
+    {
+      refreshInterval: settled.current ? 0 : 1500,
+      revalidateOnFocus: true,
+    },
   );
 
+  if (data?.match != null || data?.noMatch) {
+    settled.current = true;
+  } else {
+    settled.current = false;
+  }
+
   return {
     userCount: data?.userCount ?? 0,
     match: data?.match ?? null,
+    noMatch: data?.noMatch ?? false,
     restaurants: data?.restaurants ?? [],
     isLoading,
     error,
+    mutate,
   };
 }

src/lib/store.ts

@@ -5,6 +5,7 @@ export interface RoomData {
   users: string[];
   restaurants: Restaurant[];
   likes: Record<string, string[]>;
+  swipeCounts: Record<string, number>;
   match: string | null;
 }
 
@@ -12,11 +13,22 @@ function generateRoomId(): string {
   return String(Math.floor(1000 + Math.random() * 9000));
 }
 
+function normalize(raw: Partial<RoomData>): RoomData {
+  return {
+    users: raw.users ?? [],
+    restaurants: raw.restaurants ?? [],
+    likes: raw.likes ?? {},
+    swipeCounts: raw.swipeCounts ?? {},
+    match: raw.match ?? null,
+  };
+}
+
 export async function createRoom(restaurants: Restaurant[]): Promise<string> {
   const data: RoomData = {
     users: [],
     restaurants,
     likes: {},
+    swipeCounts: {},
     match: null,
   };
 
@@ -47,15 +59,29 @@ export async function getRoomData(
 ): Promise<RoomData | null> {
   const room = await prisma.room.findUnique({ where: { id: roomId } });
   if (!room) return null;
-  return JSON.parse(room.data) as RoomData;
+  return normalize(JSON.parse(room.data));
 }
 
-export async function updateRoomData(
+/**
+ * Atomic read-modify-write within a Prisma transaction.
+ * Prevents race conditions when multiple users swipe concurrently.
+ */
+export async function atomicUpdateRoom(
   roomId: string,
-  data: RoomData,
-): Promise<void> {
-  await prisma.room.update({
+  updater: (data: RoomData) => RoomData,
+): Promise<RoomData | null> {
+  return prisma.$transaction(async (tx) => {
+    const room = await tx.room.findUnique({ where: { id: roomId } });
+    if (!room) return null;
+
+    const data = normalize(JSON.parse(room.data));
+    const updated = updater(data);
+
+    await tx.room.update({
       where: { id: roomId },
-    data: { data: JSON.stringify(data) },
+      data: { data: JSON.stringify(updated) },
+    });
+
+    return updated;
   });
 }

src/types/index.ts

@@ -19,5 +19,6 @@ export interface RoomStatus {
   roomId: string;
   userCount: number;
   match: string | null;
+  noMatch: boolean;
   restaurants: Restaurant[];
 }