import { describe, it, expect, vi, beforeEach } from 'vitest'

const { mockSendMail, mockCreateTransport } = vi.hoisted(() => {
  const mockSendMail = vi.fn().mockResolvedValue({ messageId: 'mock-id' })
  const mockCreateTransport = vi.fn().mockReturnValue({ sendMail: mockSendMail })
  return { mockSendMail, mockCreateTransport }
})

vi.mock('nodemailer', () => ({
  default: { createTransport: mockCreateTransport },
}))

import { sendEmail, sendOrderConfirmationEmail, sendPasswordResetEmail } from '@/lib/email'

beforeEach(() => {
  vi.clearAllMocks()
  mockSendMail.mockResolvedValue({ messageId: 'mock-id' })
})

// ─── sendEmail ────────────────────────────────────────────────────────────────

describe('sendEmail', () => {
  it('calls sendMail with correct to, subject, html', async () => {
    await sendEmail({ to: 'user@example.com', subject: 'Test', html: '<p>Hello</p>' })
    expect(mockSendMail).toHaveBeenCalledWith(
      expect.objectContaining({
        to: 'user@example.com',
        subject: 'Test',
        html: '<p>Hello</p>',
      })
    )
  })

  it('includes optional text field when provided', async () => {
    await sendEmail({ to: 'u@e.com', subject: 'S', html: '<p>h</p>', text: 'plain text' })
    expect(mockSendMail).toHaveBeenCalledWith(expect.objectContaining({ text: 'plain text' }))
  })

  it('propagates sendMail errors', async () => {
    mockSendMail.mockRejectedValueOnce(new Error('SMTP down'))
    await expect(sendEmail({ to: 'u@e.com', subject: 'S', html: '<p>h</p>' })).rejects.toThrow('SMTP down')
  })
})

// ─── sendOrderConfirmationEmail ───────────────────────────────────────────────

describe('sendOrderConfirmationEmail', () => {
  it('sends email with correct subject containing orderId', async () => {
    await sendOrderConfirmationEmail('customer@example.com', {
      orderId: 'order-42',
      grandTotal: 2999,
      currency: 'EUR',
    })
    expect(mockSendMail).toHaveBeenCalledWith(
      expect.objectContaining({
        to: 'customer@example.com',
        subject: expect.stringContaining('order-42'),
      })
    )
  })

  it('formats price correctly (cents to euros)', async () => {
    await sendOrderConfirmationEmail('customer@example.com', {
      orderId: 'order-1',
      grandTotal: 2999,
      currency: 'EUR',
    })
    const callArg = mockSendMail.mock.calls[0][0]
    expect(callArg.html).toContain('29.99')
    expect(callArg.html).toContain('EUR')
  })

  it('includes orderId in the email body', async () => {
    await sendOrderConfirmationEmail('customer@example.com', {
      orderId: 'order-xyz',
      grandTotal: 1000,
      currency: 'USD',
    })
    const callArg = mockSendMail.mock.calls[0][0]
    expect(callArg.html).toContain('order-xyz')
  })

  it('includes account orders link', async () => {
    await sendOrderConfirmationEmail('customer@example.com', {
      orderId: 'order-1',
      grandTotal: 100,
      currency: 'EUR',
    })
    const callArg = mockSendMail.mock.calls[0][0]
    expect(callArg.html).toContain('/account/orders')
  })
})

// ─── sendPasswordResetEmail ───────────────────────────────────────────────────

describe('sendPasswordResetEmail', () => {
  it('sends email with reset token in URL', async () => {
    await sendPasswordResetEmail('user@example.com', 'reset-token-abc')
    const callArg = mockSendMail.mock.calls[0][0]
    expect(callArg.html).toContain('reset-token-abc')
    expect(callArg.to).toBe('user@example.com')
  })

  it('subject mentions password reset', async () => {
    await sendPasswordResetEmail('user@example.com', 'token')
    const callArg = mockSendMail.mock.calls[0][0]
    expect(callArg.subject).toMatch(/[Pp]assword [Rr]eset/)
  })
})