feat: 支持批量上传关卡

app/api/levels/route.ts

@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { prisma } from '@/lib/prisma'
 import { auth } from '@/lib/auth'
+import { compareSortKey, keyAfterLast, keyForPosition } from '@/lib/sort-key'
 import { v4 as uuidv4 } from 'uuid'
 
 // GET /api/levels - Get all levels
@@ -14,10 +15,20 @@ export async function GET(request: NextRequest) {
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
     }
 
-    const levels = await prisma.level.findMany({
-      orderBy: { sortOrder: 'asc' },
+    // 注意：不能交给 MySQL 排序。默认 collation 大小写不敏感，
+    // 会把 fractional-indexing 的 Z 系列 key 错排到 z 系列之后。
+    // 拉全表到应用层按字节序排。
+    const rows = await prisma.level.findMany()
+    rows.sort((a, b) => {
+      const c = compareSortKey(a.sortKey, b.sortKey)
+      if (c !== 0) return c
+      if (a.sortOrder !== b.sortOrder) return a.sortOrder - b.sortOrder
+      return a.createdAt.getTime() - b.createdAt.getTime()
     })
 
+    // 响应层回填连续整数 sortOrder，保持前端 / 小程序对这个字段的既有依赖
+    const levels = rows.map((r, i) => ({ ...r, sortOrder: i }))
+
     return NextResponse.json(levels)
   } catch (error) {
     console.error('Error fetching levels:', error)
@@ -28,7 +39,25 @@ export async function GET(request: NextRequest) {
   }
 }
 
+/**
+ * 解析 position：
+ * - undefined / null → 返回 undefined，交给调用方走"默认行为"
+ * - 数字字符串 → 解析成整数
+ * - 其它 → 抛错
+ *
+ * 合法范围的校验由调用方根据当前上下文（创建 / 编辑）判断。
+ */
+function parsePosition(raw: unknown): number | undefined {
+  if (raw === undefined || raw === null || raw === '') return undefined
+  const n = typeof raw === 'number' ? raw : Number(raw)
+  if (!Number.isInteger(n) || n < 1) {
+    throw new Error('position 必须是 >= 1 的整数')
+  }
+  return n
+}
+
 // POST /api/levels - Create a new level
+// body.position 可选：1..N+1；不传则追加末尾
 export async function POST(request: NextRequest) {
   try {
     const session = await auth.api.getSession({
@@ -40,7 +69,17 @@ export async function POST(request: NextRequest) {
     }
 
     const body = await request.json()
-    const { image1Url, image1Description, image2Url, image2Description, answer, punchline, hint1, hint2, hint3 } = body
+    const {
+      image1Url,
+      image1Description,
+      image2Url,
+      image2Description,
+      answer,
+      punchline,
+      hint1,
+      hint2,
+      hint3,
+    } = body
 
     if (!image1Url || !image2Url || !answer) {
       return NextResponse.json(
@@ -49,12 +88,29 @@ export async function POST(request: NextRequest) {
       )
     }
 
-    // Get max sort order
-    const maxSortOrder = await prisma.level.aggregate({
-      _max: { sortOrder: true },
-    })
+    let position: number | undefined
+    try {
+      position = parsePosition(body.position)
+    } catch (e) {
+      return NextResponse.json(
+        { error: e instanceof Error ? e.message : 'invalid position' },
+        { status: 400 }
+      )
+    }
 
-    const sortOrder = (maxSortOrder._max.sortOrder || 0) + 1
+    let sortKey: string
+    if (position === undefined) {
+      sortKey = await keyAfterLast()
+    } else {
+      const total = await prisma.level.count()
+      if (position > total + 1) {
+        return NextResponse.json(
+          { error: `position 超出范围，合法区间 [1, ${total + 1}]` },
+          { status: 400 }
+        )
+      }
+      sortKey = await keyForPosition(position)
+    }
 
     const level = await prisma.level.create({
       data: {
@@ -68,7 +124,7 @@ export async function POST(request: NextRequest) {
         hint1: hint1 || null,
         hint2: hint2 || null,
         hint3: hint3 || null,
-        sortOrder,
+        sortKey,
       },
     })
 
@@ -83,6 +139,7 @@ export async function POST(request: NextRequest) {
 }
 
 // PUT /api/levels - Update a level
+// body.position 可选：1..N（N 含当前行）。不传表示不移动位置。
 export async function PUT(request: NextRequest) {
   try {
     const session = await auth.api.getSession({
@@ -94,12 +151,46 @@ export async function PUT(request: NextRequest) {
     }
 
     const body = await request.json()
-    const { id, image1Url, image1Description, image2Url, image2Description, answer, punchline, hint1, hint2, hint3 } = body
+    const {
+      id,
+      image1Url,
+      image1Description,
+      image2Url,
+      image2Description,
+      answer,
+      punchline,
+      hint1,
+      hint2,
+      hint3,
+    } = body
 
     if (!id) {
       return NextResponse.json({ error: 'id is required' }, { status: 400 })
     }
 
+    let position: number | undefined
+    try {
+      position = parsePosition(body.position)
+    } catch (e) {
+      return NextResponse.json(
+        { error: e instanceof Error ? e.message : 'invalid position' },
+        { status: 400 }
+      )
+    }
+
+    // 只有在 position 确实变化时才重算 sortKey，避免无谓写入
+    let newSortKey: string | undefined
+    if (position !== undefined) {
+      const total = await prisma.level.count()
+      if (position > total) {
+        return NextResponse.json(
+          { error: `position 超出范围，合法区间 [1, ${total}]` },
+          { status: 400 }
+        )
+      }
+      newSortKey = await keyForPosition(position, id)
+    }
+
     const level = await prisma.level.update({
       where: { id },
       data: {
@@ -112,6 +203,7 @@ export async function PUT(request: NextRequest) {
         hint1: hint1 || null,
         hint2: hint2 || null,
         hint3: hint3 || null,
+        ...(newSortKey ? { sortKey: newSortKey } : {}),
       },
     })