import { Test, TestingModule } from '@nestjs/testing'
import { SlotGeneratorService } from '../slot-generator.service'
import { PrismaService } from '../../prisma/prisma.service'
import {
  TimeSlotStatus,
  TimeSlotSource,
  MembershipStatus,
  BookingStatus,
  getDefaultTimeSlots,
} from '@mp-pilates/shared'

// ---------------------------------------------------------------------------
// Mock PrismaService
// ---------------------------------------------------------------------------

const mockPrisma = {
  timeSlot: {
    createMany: jest.fn(),
    updateMany: jest.fn(),
  },
  membership: {
    updateMany: jest.fn(),
  },
  booking: {
    updateMany: jest.fn(),
  },
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------

describe('SlotGeneratorService', () => {
  let service: SlotGeneratorService

  beforeEach(async () => {
    jest.clearAllMocks()

    const module: TestingModule = await Test.createTestingModule({
      providers: [
        SlotGeneratorService,
        { provide: PrismaService, useValue: mockPrisma },
      ],
    }).compile()

    service = module.get<SlotGeneratorService>(SlotGeneratorService)
  })

  // -------------------------------------------------------------------------
  // generateSlots
  // -------------------------------------------------------------------------

  describe('generateSlots', () => {
    it('creates slots for every day using the default schedule (14 slots per day)', async () => {
      const defaultSlots = getDefaultTimeSlots()
      mockPrisma.timeSlot.createMany.mockResolvedValueOnce({ count: defaultSlots.length * 7 })

      const count = await service.generateSlots(7)

      expect(mockPrisma.timeSlot.createMany).toHaveBeenCalledTimes(1)
      const { data, skipDuplicates } =
        mockPrisma.timeSlot.createMany.mock.calls[0][0] as {
          data: unknown[]
          skipDuplicates: boolean
        }
      expect(skipDuplicates).toBe(true)
      // 7 days × 14 slots per day = 98
      expect(data).toHaveLength(defaultSlots.length * 7)
      expect(count).toBe(defaultSlots.length * 7)
    })

    it('creates 14 slots per day (08:00-22:00 hourly)', async () => {
      mockPrisma.timeSlot.createMany.mockResolvedValueOnce({ count: 14 })

      await service.generateSlots(1)

      const { data } = mockPrisma.timeSlot.createMany.mock.calls[0][0] as {
        data: Array<{ startTime: string; endTime: string }>
      }
      expect(data).toHaveLength(14)
      expect(data[0].startTime).toBe('08:00')
      expect(data[0].endTime).toBe('09:00')
      expect(data[13].startTime).toBe('21:00')
      expect(data[13].endTime).toBe('22:00')
    })

    it('passes skipDuplicates: true to handle existing date+time combinations', async () => {
      mockPrisma.timeSlot.createMany.mockResolvedValueOnce({ count: 0 })

      await service.generateSlots(1)

      const call = mockPrisma.timeSlot.createMany.mock.calls[0][0] as {
        skipDuplicates: boolean
      }
      expect(call.skipDuplicates).toBe(true)
    })

    it('sets source to TEMPLATE for all generated slots', async () => {
      mockPrisma.timeSlot.createMany.mockResolvedValueOnce({ count: 14 })

      await service.generateSlots(1)

      const { data } = mockPrisma.timeSlot.createMany.mock.calls[0][0] as {
        data: Array<{ source: TimeSlotSource }>
      }
      for (const slot of data) {
        expect(slot.source).toBe(TimeSlotSource.TEMPLATE)
      }
    })
  })

  // -------------------------------------------------------------------------
  // cleanupExpiredSlots
  // -------------------------------------------------------------------------

  describe('cleanupExpiredSlots', () => {
    it('marks past OPEN slots as CLOSED', async () => {
      mockPrisma.timeSlot.updateMany.mockResolvedValueOnce({ count: 3 })

      const count = await service.cleanupExpiredSlots()

      expect(count).toBe(3)
      expect(mockPrisma.timeSlot.updateMany).toHaveBeenCalledWith(
        expect.objectContaining({
          where: expect.objectContaining({
            status: TimeSlotStatus.OPEN,
          }),
          data: { status: TimeSlotStatus.CLOSED },
        }),
      )
    })

    it('queries slots with date lt today', async () => {
      mockPrisma.timeSlot.updateMany.mockResolvedValueOnce({ count: 0 })

      await service.cleanupExpiredSlots()

      const where = (mockPrisma.timeSlot.updateMany.mock.calls[0][0] as {
        where: { date: { lt: Date } }
      }).where
      const today = new Date()
      today.setUTCHours(0, 0, 0, 0)

      // The lt date should be today at midnight (within 1 second of test run)
      const diff = Math.abs(where.date.lt.getTime() - today.getTime())
      expect(diff).toBeLessThan(1000)
    })
  })

  // -------------------------------------------------------------------------
  // checkExpiredMemberships
  // -------------------------------------------------------------------------

  describe('checkExpiredMemberships', () => {
    it('marks expired-date memberships as EXPIRED', async () => {
      mockPrisma.membership.updateMany
        .mockResolvedValueOnce({ count: 2 }) // date-expired
        .mockResolvedValueOnce({ count: 1 }) // used-up

      const total = await service.checkExpiredMemberships()

      expect(total).toBe(3)

      const firstCall = (
        mockPrisma.membership.updateMany.mock.calls[0][0] as {
          data: { status: MembershipStatus }
        }
      ).data
      expect(firstCall.status).toBe(MembershipStatus.EXPIRED)
    })

    it('marks zero-remaining memberships as USED_UP', async () => {
      mockPrisma.membership.updateMany
        .mockResolvedValueOnce({ count: 0 })
        .mockResolvedValueOnce({ count: 4 })

      const total = await service.checkExpiredMemberships()

      expect(total).toBe(4)

      const secondCall = (
        mockPrisma.membership.updateMany.mock.calls[1][0] as {
          where: { remainingTimes: number }
          data: { status: MembershipStatus }
        }
      )
      expect(secondCall.where.remainingTimes).toBe(0)
      expect(secondCall.data.status).toBe(MembershipStatus.USED_UP)
    })

    it('runs both updates in parallel and sums results', async () => {
      mockPrisma.membership.updateMany
        .mockResolvedValueOnce({ count: 3 })
        .mockResolvedValueOnce({ count: 2 })

      const total = await service.checkExpiredMemberships()

      expect(total).toBe(5)
      expect(mockPrisma.membership.updateMany).toHaveBeenCalledTimes(2)
    })
  })

  // -------------------------------------------------------------------------
  // completeBookings
  // -------------------------------------------------------------------------

  describe('completeBookings', () => {
    it('marks past CONFIRMED bookings as COMPLETED', async () => {
      mockPrisma.booking.updateMany.mockResolvedValueOnce({ count: 5 })

      const count = await service.completeBookings()

      expect(count).toBe(5)
      expect(mockPrisma.booking.updateMany).toHaveBeenCalledWith(
        expect.objectContaining({
          where: expect.objectContaining({
            status: BookingStatus.CONFIRMED,
          }),
          data: { status: BookingStatus.COMPLETED },
        }),
      )
    })

    it('filters by timeSlot.date lt today', async () => {
      mockPrisma.booking.updateMany.mockResolvedValueOnce({ count: 0 })

      await service.completeBookings()

      const where = (mockPrisma.booking.updateMany.mock.calls[0][0] as {
        where: { timeSlot: { date: { lt: Date } } }
      }).where
      const today = new Date()
      today.setUTCHours(0, 0, 0, 0)

      const diff = Math.abs(where.timeSlot.date.lt.getTime() - today.getTime())
      expect(diff).toBeLessThan(1000)
    })
  })
})