import { describe, it, expect, beforeEach, vi } from 'vitest'
import { prisma } from '../db'
import { claimLists, getClaimableLists, hasExistingLists } from '../migration-actions'
import bcrypt from 'bcryptjs'

// Mock auth
vi.mock('@/auth', () => ({
  auth: vi.fn(),
}))

const { auth } = await import('@/auth')

describe('Migration Actions', () => {
  let testUser: any
  let testLists: any[]

  beforeEach(async () => {
    // Clean up test data
    await prisma.list.deleteMany({})
    await prisma.user.deleteMany({})

    // Create test user
    const passwordHash = await bcrypt.hash('password123', 10)
    testUser = await prisma.user.create({
      data: {
        email: 'test@example.com',
        name: 'Test User',
        passwordHash,
      },
    })

    // Create test lists owned by test user
    testLists = await Promise.all([
      prisma.list.create({
        data: {
          title: 'Test List 1',
          color: '#FF0000',
          ownerId: testUser.id,
        },
      }),
      prisma.list.create({
        data: {
          title: 'Test List 2',
          color: '#00FF00',
          ownerId: testUser.id,
        },
      }),
    ])
  })

  describe('getClaimableLists', () => {
    it('should return lists that exist in the database', async () => {
      const listIds = testLists.map(l => l.id)
      const claimable = await getClaimableLists(listIds)

      expect(claimable).toHaveLength(2)
      expect(claimable[0].title).toBe('Test List 1')
      expect(claimable[1].title).toBe('Test List 2')
      expect(claimable[0].itemCount).toBe(0)
    })

    it('should return empty array for non-existent list IDs', async () => {
      const claimable = await getClaimableLists(['non-existent-id'])
      expect(claimable).toHaveLength(0)
    })

    it('should return empty array for empty input', async () => {
      const claimable = await getClaimableLists([])
      expect(claimable).toHaveLength(0)
    })
  })

  describe('claimLists', () => {
    let newUser: any

    beforeEach(async () => {
      // Create a new user to claim lists
      const passwordHash = await bcrypt.hash('password456', 10)
      newUser = await prisma.user.create({
        data: {
          email: 'newuser@example.com',
          name: 'New User',
          passwordHash,
        },
      })
    })

    it('should transfer lists to the authenticated user', async () => {
      // Mock auth to return new user
      vi.mocked(auth).mockResolvedValue({
        user: { id: newUser.id, email: newUser.email, name: newUser.name },
        expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
      })

      const listIds = testLists.map(l => l.id)
      const result = await claimLists(listIds)

      expect(result.success).toBe(true)
      expect(result.migratedCount).toBe(2)

      // Verify lists are now owned by new user
      const updatedLists = await prisma.list.findMany({
        where: { id: { in: listIds } },
      })

      updatedLists.forEach(list => {
        expect(list.ownerId).toBe(newUser.id)
      })
    })

    it('should preserve all list data during migration', async () => {
      // Mock auth
      vi.mocked(auth).mockResolvedValue({
        user: { id: newUser.id, email: newUser.email, name: newUser.name },
        expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
      })

      const originalList = testLists[0]
      const listIds = [originalList.id]

      await claimLists(listIds)

      // Verify list data is preserved
      const updatedList = await prisma.list.findUnique({
        where: { id: originalList.id },
      })

      expect(updatedList).toBeDefined()
      expect(updatedList!.title).toBe(originalList.title)
      expect(updatedList!.color).toBe(originalList.color)
      expect(updatedList!.createdAt.getTime()).toBe(originalList.createdAt.getTime())
      // Only ownerId should change
      expect(updatedList!.ownerId).toBe(newUser.id)
    })

    it('should return error when not authenticated', async () => {
      // Mock auth to return null
      vi.mocked(auth).mockResolvedValue(null)

      const result = await claimLists([testLists[0].id])

      expect(result.success).toBe(false)
      expect(result.error).toContain('Unauthorized')
    })

    it('should handle empty list IDs', async () => {
      // Mock auth
      vi.mocked(auth).mockResolvedValue({
        user: { id: newUser.id, email: newUser.email, name: newUser.name },
        expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
      })

      const result = await claimLists([])

      expect(result.success).toBe(true)
      expect(result.migratedCount).toBe(0)
    })
  })

  describe('hasExistingLists', () => {
    it('should return true when user has lists', async () => {
      // Mock auth
      vi.mocked(auth).mockResolvedValue({
        user: { id: testUser.id, email: testUser.email, name: testUser.name },
        expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
      })

      const result = await hasExistingLists()
      expect(result).toBe(true)
    })

    it('should return false when user has no lists', async () => {
      // Create user with no lists
      const passwordHash = await bcrypt.hash('password789', 10)
      const emptyUser = await prisma.user.create({
        data: {
          email: 'empty@example.com',
          name: 'Empty User',
          passwordHash,
        },
      })

      // Mock auth
      vi.mocked(auth).mockResolvedValue({
        user: { id: emptyUser.id, email: emptyUser.email, name: emptyUser.name },
        expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
      })

      const result = await hasExistingLists()
      expect(result).toBe(false)
    })

    it('should return false when not authenticated', async () => {
      // Mock auth to return null
      vi.mocked(auth).mockResolvedValue(null)

      const result = await hasExistingLists()
      expect(result).toBe(false)
    })
  })
})