import { Prisma } from '@prisma/client'

const mockFindUnique = jest.fn()
const mockCreate = jest.fn()
const mockUpdate = jest.fn()
const mockDelete = jest.fn()
const mockAccountUpdate = jest.fn()
const mockPositionFindUnique = jest.fn()
const mockPositionUpdate = jest.fn()
const mockPositionCreate = jest.fn()
const mockPositionDelete = jest.fn()

jest.mock('@/lib/prisma', () => ({
  prisma: {
    transaction: {
      create: (...args: any[]) => mockCreate(...args),
      findUnique: (...args: any[]) => mockFindUnique(...args),
      update: (...args: any[]) => mockUpdate(...args),
      delete: (...args: any[]) => mockDelete(...args),
    },
    account: {
      update: (...args: any[]) => mockAccountUpdate(...args),
    },
    position: {
      findUnique: (...args: any[]) => mockPositionFindUnique(...args),
      update: (...args: any[]) => mockPositionUpdate(...args),
      create: (...args: any[]) => mockPositionCreate(...args),
      delete: (...args: any[]) => mockPositionDelete(...args),
    },
    $transaction: async (callback: (tx: any) => Promise<any>) => {
      const tx = {
        transaction: {
          create: mockCreate,
          findUnique: mockFindUnique,
          update: mockUpdate,
          delete: mockDelete,
        },
        account: { update: mockAccountUpdate },
        position: {
          findUnique: mockPositionFindUnique,
          update: mockPositionUpdate,
          create: mockPositionCreate,
          delete: mockPositionDelete,
        },
      }
      return callback(tx)
    },
  },
}))

import { POST, DELETE } from '../src/app/api/transactions/route'

describe('Transactions API - POST (创建交易)', () => {
  beforeEach(() => {
    jest.clearAllMocks()
  })

  describe('DEPOSIT / WITHDRAW', () => {
    it('入金增加账户余额', async () => {
      mockCreate.mockResolvedValue({
        id: 'txn-1',
        type: 'DEPOSIT',
        amount: new Prisma.Decimal('5000'),
        accountId: 'acc-1',
      })
      mockAccountUpdate.mockResolvedValue({ id: 'acc-1', balance: new Prisma.Decimal('15000') })

      const req = new Request('http://localhost/api/transactions', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          accountId: 'acc-1',
          type: 'DEPOSIT',
          amount: '5000',
          currency: 'USD',
          executedAt: '2024-01-15T10:00:00Z',
        }),
      })

      const res = await POST(req)
      expect(res.status).toBe(201)
      expect(mockAccountUpdate).toHaveBeenCalledWith({
        where: { id: 'acc-1' },
        data: { balance: { increment: new Prisma.Decimal('5000') } },
      })
    })

    it('出金减少账户余额', async () => {
      mockCreate.mockResolvedValue({
        id: 'txn-1',
        type: 'WITHDRAW',
        amount: new Prisma.Decimal('3000'),
        accountId: 'acc-1',
      })
      mockAccountUpdate.mockResolvedValue({ id: 'acc-1', balance: new Prisma.Decimal('7000') })

      const req = new Request('http://localhost/api/transactions', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          accountId: 'acc-1',
          type: 'WITHDRAW',
          amount: '3000',
          currency: 'USD',
          executedAt: '2024-01-15T10:00:00Z',
        }),
      })

      const res = await POST(req)
      expect(res.status).toBe(201)
      expect(mockAccountUpdate).toHaveBeenCalledWith({
        where: { id: 'acc-1' },
        data: { balance: { increment: new Prisma.Decimal('-3000') } },
      })
    })
  })

  describe('BUY 买入持仓', () => {
    it('新建持仓 - 首次买入', async () => {
      mockCreate.mockResolvedValue({
        id: 'txn-1',
        type: 'BUY',
        symbol: 'BTC',
        quantity: new Prisma.Decimal('0.5'),
        price: new Prisma.Decimal('50000'),
        amount: new Prisma.Decimal('25000'),
        currency: 'USD',
      })
      mockPositionFindUnique.mockResolvedValue(null)
      mockPositionCreate.mockResolvedValue({
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'BTC',
        quantity: new Prisma.Decimal('0.5'),
        averageCost: new Prisma.Decimal('50000'),
        currency: 'USD',
      })

      const req = new Request('http://localhost/api/transactions', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          accountId: 'acc-1',
          type: 'BUY',
          symbol: 'BTC',
          quantity: '0.5',
          price: '50000',
          amount: '25000',
          currency: 'USD',
          executedAt: '2024-01-15T10:00:00Z',
        }),
      })

      const res = await POST(req)
      expect(res.status).toBe(201)
      expect(mockPositionCreate).toHaveBeenCalledWith({
        data: {
          accountId: 'acc-1',
          symbol: 'BTC',
          quantity: new Prisma.Decimal('0.5'),
          averageCost: new Prisma.Decimal('50000'),
          currency: 'USD',
        },
      })
    })

    it('更新持仓 - 计算新平均成本', async () => {
      const existingPosition = {
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('10'),
        averageCost: new Prisma.Decimal('150'),
        currency: 'USD',
      }
      mockPositionFindUnique.mockResolvedValue(existingPosition)
      mockPositionUpdate.mockResolvedValue({
        ...existingPosition,
        quantity: new Prisma.Decimal('20'),
        averageCost: new Prisma.Decimal('155'),
      })
      mockCreate.mockResolvedValue({ id: 'txn-1', type: 'BUY' })

      const req = new Request('http://localhost/api/transactions', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          accountId: 'acc-1',
          type: 'BUY',
          symbol: 'AAPL',
          quantity: '10',
          price: '160',
          amount: '1600',
          currency: 'USD',
          executedAt: '2024-01-15T10:00:00Z',
        }),
      })

      const res = await POST(req)
      expect(res.status).toBe(201)
      
      const updateCall = mockPositionUpdate.mock.calls[0][0]
      const newQty = updateCall.data.quantity
      const newAvgCost = updateCall.data.averageCost
      expect(newQty.toString()).toBe('20')
      expect(newAvgCost.toString()).toBe('155')
    })
  })

  describe('SELL 卖出持仓', () => {
    it('卖出减少持仓数量', async () => {
      const existingPosition = {
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('10'),
        averageCost: new Prisma.Decimal('150'),
        currency: 'USD',
      }
      mockPositionFindUnique.mockResolvedValue(existingPosition)
      mockPositionUpdate.mockResolvedValue({
        ...existingPosition,
        quantity: new Prisma.Decimal('5'),
      })
      mockCreate.mockResolvedValue({ id: 'txn-1', type: 'SELL' })

      const req = new Request('http://localhost/api/transactions', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          accountId: 'acc-1',
          type: 'SELL',
          symbol: 'AAPL',
          quantity: '5',
          price: '180',
          amount: '900',
          currency: 'USD',
          executedAt: '2024-01-15T10:00:00Z',
        }),
      })

      const res = await POST(req)
      expect(res.status).toBe(201)
      
      const updateCall = mockPositionUpdate.mock.calls[0][0]
      expect(updateCall.data.quantity.toString()).toBe('5')
    })

    it('卖出清空持仓 - 数量归零', async () => {
      const existingPosition = {
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('10'),
        averageCost: new Prisma.Decimal('150'),
        currency: 'USD',
      }
      mockPositionFindUnique.mockResolvedValue(existingPosition)
      mockPositionUpdate.mockResolvedValue({
        ...existingPosition,
        quantity: new Prisma.Decimal('0'),
      })
      mockCreate.mockResolvedValue({ id: 'txn-1', type: 'SELL' })

      const req = new Request('http://localhost/api/transactions', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          accountId: 'acc-1',
          type: 'SELL',
          symbol: 'AAPL',
          quantity: '10',
          price: '180',
          amount: '1800',
          currency: 'USD',
          executedAt: '2024-01-15T10:00:00Z',
        }),
      })

      const res = await POST(req)
      expect(res.status).toBe(201)
      
      const updateCall = mockPositionUpdate.mock.calls[0][0]
      expect(updateCall.data.quantity.toString()).toBe('0')
    })
  })
})

describe('Transactions API - DELETE (删除交易)', () => {
  beforeEach(() => {
    jest.clearAllMocks()
  })

  describe('撤销BUY', () => {
    it('撤销买入 - 按比例还原平均成本', async () => {
      const existingPosition = {
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('20'),
        averageCost: new Prisma.Decimal('155'),
        currency: 'USD',
      }
      const buyTransaction = {
        id: 'txn-buy-1',
        accountId: 'acc-1',
        type: 'BUY' as const,
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('10'),
        price: new Prisma.Decimal('160'),
        amount: new Prisma.Decimal('1600'),
      }

      mockFindUnique.mockResolvedValue(buyTransaction)
      mockPositionFindUnique.mockResolvedValue(existingPosition)
      mockPositionUpdate.mockResolvedValue({
        ...existingPosition,
        quantity: new Prisma.Decimal('10'),
        averageCost: new Prisma.Decimal('150'),
      })
      mockDelete.mockResolvedValue({ id: 'txn-buy-1' })
      mockAccountUpdate.mockResolvedValue({})

      const req = new Request('http://localhost/api/transactions?id=txn-buy-1', {
        method: 'DELETE',
      })

      const res = await DELETE(req)
      expect(res.status).toBe(200)
      
      const positionUpdateCall = mockPositionUpdate.mock.calls[0][0]
      expect(positionUpdateCall.data.quantity.toString()).toBe('10')
    })

    it('撤销买入 - 全部撤销删除持仓', async () => {
      const existingPosition = {
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('10'),
        averageCost: new Prisma.Decimal('160'),
        currency: 'USD',
      }
      const buyTransaction = {
        id: 'txn-buy-1',
        accountId: 'acc-1',
        type: 'BUY' as const,
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('10'),
        price: new Prisma.Decimal('160'),
        amount: new Prisma.Decimal('1600'),
      }

      mockFindUnique.mockResolvedValue(buyTransaction)
      mockPositionFindUnique.mockResolvedValue(existingPosition)
      mockPositionUpdate.mockResolvedValue({
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('0'),
        averageCost: new Prisma.Decimal('160'),
        currency: 'USD',
      })
      mockDelete.mockResolvedValue({ id: 'txn-buy-1' })
      mockAccountUpdate.mockResolvedValue({})

      const req = new Request('http://localhost/api/transactions?id=txn-buy-1', {
        method: 'DELETE',
      })

      const res = await DELETE(req)
      expect(res.status).toBe(200)
    })
  })

  describe('撤销SELL', () => {
    it('撤销卖出 - 恢复持仓数量', async () => {
      const existingPosition = {
        id: 'pos-1',
        accountId: 'acc-1',
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('15'),
        averageCost: new Prisma.Decimal('150'),
        currency: 'USD',
      }
      const sellTransaction = {
        id: 'txn-sell-1',
        accountId: 'acc-1',
        type: 'SELL' as const,
        symbol: 'AAPL',
        quantity: new Prisma.Decimal('5'),
        price: new Prisma.Decimal('180'),
        amount: new Prisma.Decimal('900'),
      }

      mockFindUnique.mockResolvedValue(sellTransaction)
      mockPositionFindUnique.mockResolvedValue(existingPosition)
      mockPositionUpdate.mockResolvedValue({
        ...existingPosition,
        quantity: new Prisma.Decimal('20'),
      })
      mockDelete.mockResolvedValue({ id: 'txn-sell-1' })
      mockAccountUpdate.mockResolvedValue({})

      const req = new Request('http://localhost/api/transactions?id=txn-sell-1', {
        method: 'DELETE',
      })

      const res = await DELETE(req)
      expect(res.status).toBe(200)
      
      const positionUpdateCall = mockPositionUpdate.mock.calls[0][0]
      expect(positionUpdateCall.data.quantity.toString()).toBe('20')
    })
  })
})