import { describe, it, expect, beforeAll, beforeEach, afterAll } from 'bun:test'
import type { FastifyInstance } from 'fastify'
import { createTestApp, cleanDb, seedTestCompany, registerAndLogin, TEST_COMPANY_ID } from '../../src/test/helpers.js'
import { AccountService, PaymentMethodService, TaxExemptionService } from '../../src/services/account.service.js'

describe('PaymentMethodService', () => {
  let app: FastifyInstance
  let accountId: string

  beforeAll(async () => {
    app = await createTestApp()
  })

  beforeEach(async () => {
    await cleanDb(app)
    await seedTestCompany(app)
    const auth = await registerAndLogin(app, { email: `pm-svc-${Date.now()}@test.com` })

    const account = await AccountService.create(app.db, TEST_COMPANY_ID, { name: 'PM Test' })
    accountId = account.id
  })

  afterAll(async () => {
    await app.close()
  })

  it('creates a payment method', async () => {
    const pm = await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_abc',
      cardBrand: 'visa',
      lastFour: '4242',
      expMonth: 12,
      expYear: 2027,
      isDefault: false,
    })
    expect(pm.processorPaymentMethodId).toBe('pm_abc')
    expect(pm.isDefault).toBe(false)
  })

  it('unsets old default when creating a new default', async () => {
    const first = await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_first',
      isDefault: true,
    })
    expect(first.isDefault).toBe(true)

    const second = await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_second',
      isDefault: true,
    })
    expect(second.isDefault).toBe(true)

    // First should no longer be default
    const firstRefreshed = await PaymentMethodService.getById(app.db, TEST_COMPANY_ID, first.id)
    expect(firstRefreshed!.isDefault).toBe(false)
  })

  it('unsets old default when updating to default', async () => {
    const first = await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_1',
      isDefault: true,
    })

    const second = await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_2',
      isDefault: false,
    })

    await PaymentMethodService.update(app.db, TEST_COMPANY_ID, second.id, { isDefault: true })

    const firstRefreshed = await PaymentMethodService.getById(app.db, TEST_COMPANY_ID, first.id)
    expect(firstRefreshed!.isDefault).toBe(false)

    const secondRefreshed = await PaymentMethodService.getById(app.db, TEST_COMPANY_ID, second.id)
    expect(secondRefreshed!.isDefault).toBe(true)
  })

  it('does not affect other accounts when setting default', async () => {
    const otherAccount = await AccountService.create(app.db, TEST_COMPANY_ID, { name: 'Other' })

    const otherPm = await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId: otherAccount.id,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_other',
      isDefault: true,
    })

    // Create default on our account — should not touch the other account's default
    await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_ours',
      isDefault: true,
    })

    const otherRefreshed = await PaymentMethodService.getById(app.db, TEST_COMPANY_ID, otherPm.id)
    expect(otherRefreshed!.isDefault).toBe(true)
  })

  it('lists only methods for the requested account', async () => {
    const otherAccount = await AccountService.create(app.db, TEST_COMPANY_ID, { name: 'Other' })

    await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_a',
      isDefault: false,
    })
    await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId: otherAccount.id,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_b',
      isDefault: false,
    })

    const methods = await PaymentMethodService.listByAccount(app.db, TEST_COMPANY_ID, accountId)
    expect(methods.length).toBe(1)
    expect(methods[0].processorPaymentMethodId).toBe('pm_a')
  })

  it('deletes a payment method', async () => {
    const pm = await PaymentMethodService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      processor: 'stripe',
      processorPaymentMethodId: 'pm_del',
      isDefault: false,
    })

    const deleted = await PaymentMethodService.delete(app.db, TEST_COMPANY_ID, pm.id)
    expect(deleted).not.toBeNull()

    const fetched = await PaymentMethodService.getById(app.db, TEST_COMPANY_ID, pm.id)
    expect(fetched).toBeNull()
  })
})

describe('TaxExemptionService', () => {
  let app: FastifyInstance
  let accountId: string
  let userId: string

  beforeAll(async () => {
    app = await createTestApp()
  })

  beforeEach(async () => {
    await cleanDb(app)
    await seedTestCompany(app)
    const auth = await registerAndLogin(app, { email: `tax-svc-${Date.now()}@test.com` })
    userId = (auth.user as { id: string }).id

    const account = await AccountService.create(app.db, TEST_COMPANY_ID, { name: 'Tax Test' })
    accountId = account.id
  })

  afterAll(async () => {
    await app.close()
  })

  it('creates an exemption in pending status', async () => {
    const exemption = await TaxExemptionService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      certificateNumber: 'TX-001',
      certificateType: 'resale',
      issuingState: 'TX',
    })
    expect(exemption.status).toBe('pending')
    expect(exemption.certificateNumber).toBe('TX-001')
    expect(exemption.approvedBy).toBeNull()
  })

  it('approves a pending exemption', async () => {
    const exemption = await TaxExemptionService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      certificateNumber: 'TX-002',
    })

    const approved = await TaxExemptionService.approve(app.db, TEST_COMPANY_ID, exemption.id, userId)
    expect(approved!.status).toBe('approved')
    expect(approved!.approvedBy).toBe(userId)
    expect(approved!.approvedAt).toBeTruthy()
  })

  it('revokes an exemption with reason', async () => {
    const exemption = await TaxExemptionService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      certificateNumber: 'TX-003',
    })
    await TaxExemptionService.approve(app.db, TEST_COMPANY_ID, exemption.id, userId)

    const revoked = await TaxExemptionService.revoke(app.db, TEST_COMPANY_ID, exemption.id, userId, 'Expired')
    expect(revoked!.status).toBe('none')
    expect(revoked!.revokedBy).toBe(userId)
    expect(revoked!.revokedReason).toBe('Expired')
    expect(revoked!.revokedAt).toBeTruthy()
  })

  it('lists exemptions for an account', async () => {
    await TaxExemptionService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      certificateNumber: 'CERT-A',
    })
    await TaxExemptionService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      certificateNumber: 'CERT-B',
    })

    const list = await TaxExemptionService.listByAccount(app.db, TEST_COMPANY_ID, accountId)
    expect(list.length).toBe(2)
  })

  it('updates exemption details', async () => {
    const exemption = await TaxExemptionService.create(app.db, TEST_COMPANY_ID, {
      accountId,
      certificateNumber: 'OLD',
    })

    const updated = await TaxExemptionService.update(app.db, TEST_COMPANY_ID, exemption.id, {
      certificateNumber: 'NEW',
      issuingState: 'CA',
    })
    expect(updated!.certificateNumber).toBe('NEW')
    expect(updated!.issuingState).toBe('CA')
  })

  it('returns null for nonexistent exemption', async () => {
    const result = await TaxExemptionService.getById(app.db, TEST_COMPANY_ID, '00000000-0000-0000-0000-000000000000')
    expect(result).toBeNull()
  })
})