fix(server): support rebooking cancelled slots

packages/server/src/booking/__tests__/booking.service.spec.ts

@@ -257,7 +257,7 @@ describe('BookingService', () => {
         bookingContent: '预约已确认',
         bookingTime: '2099-12-31 09:00',
         courseName: 'FocusCore Pilates',
-        bookingPeriod: '2099-12-31 09:00~10:00',
+        bookingEndTime: '2099-12-31 10:00',
       })
     })
   })
@@ -270,7 +270,7 @@ describe('BookingService', () => {
     it('creates booking in pending confirmation status', async () => {
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
-      tx.booking.findFirst.mockResolvedValue(null) // no duplicate
+      tx.booking.findUnique.mockResolvedValue(null) // no duplicate
       tx.membership.findUnique.mockResolvedValue(mockActiveMembership)
       tx.booking.create.mockResolvedValue({
         ...mockConfirmedBooking,
@@ -312,7 +312,7 @@ describe('BookingService', () => {
 
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(nearFullSlot)
-      tx.booking.findFirst.mockResolvedValue(null)
+      tx.booking.findUnique.mockResolvedValue(null)
       tx.membership.findUnique.mockResolvedValue(mockActiveMembership)
       tx.booking.create.mockResolvedValue({
         ...mockConfirmedBooking,
@@ -345,7 +345,7 @@ describe('BookingService', () => {
 
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
-      tx.booking.findFirst.mockResolvedValue(null)
+      tx.booking.findUnique.mockResolvedValue(null)
       tx.membership.findUnique.mockResolvedValue(mockDurationMembership)
       tx.booking.create.mockResolvedValue({ ...mockConfirmedBooking, membershipId: mockDurationMembership.id })
       tx.timeSlot.update.mockResolvedValue({ ...mockOpenSlot, bookedCount: 1 })
@@ -368,7 +368,7 @@ describe('BookingService', () => {
     it('allows time-based membership with zero remaining times and leaves deduction to admin confirmation', async () => {
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
-      tx.booking.findFirst.mockResolvedValue(null)
+      tx.booking.findUnique.mockResolvedValue(null)
       tx.membership.findUnique.mockResolvedValue(mockMembershipNoTimes)
       tx.booking.create.mockResolvedValue({
         ...mockConfirmedBooking,
@@ -394,7 +394,7 @@ describe('BookingService', () => {
     it('sends admin booking created subscription message to admins with remaining count', async () => {
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
-      tx.booking.findFirst.mockResolvedValue(null)
+      tx.booking.findUnique.mockResolvedValue(null)
       tx.membership.findUnique.mockResolvedValue(mockActiveMembership)
       tx.booking.create.mockResolvedValue({
         ...mockConfirmedBooking,
@@ -435,7 +435,7 @@ describe('BookingService', () => {
         bookingContent: 'Alice已预约',
         bookingTime: '2099-12-31 09:00',
         courseName: 'FocusCore Pilates',
-        bookingPeriod: '2099-12-31 09:00~10:00',
+        bookingEndTime: '2099-12-31 10:00',
       })
     })
 
@@ -455,7 +455,7 @@ describe('BookingService', () => {
     it('throws ConflictException on duplicate booking (same user + slot)', async () => {
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
-      tx.booking.findFirst.mockResolvedValue(mockConfirmedBooking) // duplicate exists
+      tx.booking.findUnique.mockResolvedValue(mockConfirmedBooking) // duplicate exists
 
       ;(prisma.$transaction as jest.Mock).mockImplementation((fn) => fn(tx))
 
@@ -467,7 +467,7 @@ describe('BookingService', () => {
     it('throws BadRequestException when membership is not ACTIVE (expired status)', async () => {
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
-      tx.booking.findFirst.mockResolvedValue(null)
+      tx.booking.findUnique.mockResolvedValue(null)
       tx.membership.findUnique.mockResolvedValue(mockExpiredMembership)
 
       ;(prisma.$transaction as jest.Mock).mockImplementation((fn) => fn(tx))
@@ -493,7 +493,7 @@ describe('BookingService', () => {
 
       const tx = buildTxMock()
       tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
-      tx.booking.findFirst.mockResolvedValue(null)
+      tx.booking.findUnique.mockResolvedValue(null)
       tx.membership.findUnique.mockResolvedValue(otherUserMembership)
 
       ;(prisma.$transaction as jest.Mock).mockImplementation((fn) => fn(tx))
@@ -502,6 +502,65 @@ describe('BookingService', () => {
         ForbiddenException,
       )
     })
+
+    it('reuses a cancelled booking record when booking the same slot again', async () => {
+      const cancelledBooking = {
+        ...mockConfirmedBooking,
+        status: BookingStatus.CANCELLED,
+        membershipId: 'mem-old-001',
+        cancelledAt: new Date('2099-12-30T00:00:00Z'),
+        confirmedAt: new Date('2099-12-29T00:00:00Z'),
+        completedAt: null,
+        operatorId: 'admin-001',
+      }
+
+      const tx = buildTxMock()
+      tx.timeSlot.findUnique.mockResolvedValue(mockOpenSlot)
+      tx.booking.findUnique.mockResolvedValue(cancelledBooking)
+      tx.membership.findUnique.mockResolvedValue(mockActiveMembership)
+      tx.booking.update.mockResolvedValue({
+        ...cancelledBooking,
+        membershipId: MOCK_MEMBERSHIP_ID,
+        status: BookingStatus.PENDING_CONFIRMATION,
+        cancelledAt: null,
+        confirmedAt: null,
+        operatorId: null,
+      })
+
+      ;(prisma.$transaction as jest.Mock).mockImplementation((fn) => fn(tx))
+      ;(prisma.booking.findUnique as jest.Mock).mockResolvedValue({
+        ...mockConfirmedBooking,
+        status: BookingStatus.PENDING_CONFIRMATION,
+        timeSlot: mockOpenSlot,
+        membership: mockActiveMembership,
+      })
+      ;(prisma.user.findMany as jest.Mock).mockResolvedValue([])
+
+      await service.createBooking(MOCK_USER_ID, dto)
+
+      expect(tx.booking.create).not.toHaveBeenCalled()
+      expect(tx.booking.update).toHaveBeenCalledWith({
+        where: { id: MOCK_BOOKING_ID },
+        data: {
+          membershipId: MOCK_MEMBERSHIP_ID,
+          status: BookingStatus.PENDING_CONFIRMATION,
+          cancelledAt: null,
+          confirmedAt: null,
+          completedAt: null,
+          operatorId: null,
+        },
+      })
+      expect(tx.bookingStatusHistory.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          data: expect.objectContaining({
+            bookingId: MOCK_BOOKING_ID,
+            fromStatus: BookingStatus.CANCELLED,
+            toStatus: BookingStatus.PENDING_CONFIRMATION,
+            remark: '学员重新发起预约',
+          }),
+        }),
+      )
+    })
   })
 
   // ─── cancelBooking ────────────────────────────────────────────────────────