import { describe, it, expect, vi, beforeEach } from 'vitest'
import { sendWhatsAppMessage } from '@/lib/notifications/whatsapp'

const fetchMock = vi.fn()
vi.stubGlobal('fetch', fetchMock)

describe('sendWhatsAppMessage', () => {
  beforeEach(() => fetchMock.mockClear())

  it('posts to Meta Graph API with correct template structure', async () => {
    fetchMock.mockResolvedValueOnce(
      new Response('{"messages":[{"id":"wamid.abc"}]}', { status: 200 })
    )
    await sendWhatsAppMessage(
      '60123456789',
      'ims_incident_alert',
      ['SETIA-202407-0001', 'injury', 'Warehouse A'],
      'test-phone-id',
      'test-token'
    )
    expect(fetchMock).toHaveBeenCalledOnce()
    const [url, opts] = fetchMock.mock.calls[0]
    expect(url).toBe('https://graph.facebook.com/v19.0/test-phone-id/messages')
    expect(opts.method).toBe('POST')
    expect(opts.headers['Authorization']).toBe('Bearer test-token')
    const body = JSON.parse(opts.body)
    expect(body.messaging_product).toBe('whatsapp')
    expect(body.to).toBe('60123456789')
    expect(body.type).toBe('template')
    expect(body.template.name).toBe('ims_incident_alert')
    expect(body.template.language.code).toBe('en_US')
    expect(body.template.components[0].parameters).toHaveLength(3)
    expect(body.template.components[0].parameters[0]).toEqual({ type: 'text', text: 'SETIA-202407-0001' })
  })

  it('throws on non-2xx response', async () => {
    fetchMock.mockResolvedValueOnce(
      new Response('{"error":{"message":"Invalid token"}}', { status: 400 })
    )
    await expect(
      sendWhatsAppMessage('60123456789', 'ims_incident_alert', ['a'], 'pid', 'tok')
    ).rejects.toThrow('WhatsApp API error: 400')
  })

  it('returns immediately without calling fetch when phoneNumber is empty', async () => {
    await sendWhatsAppMessage('', 'ims_incident_alert', ['a'], 'pid', 'tok')
    expect(fetchMock).not.toHaveBeenCalled()
  })

  it('sanitizes phone number — strips spaces, dashes, and plus sign', async () => {
    fetchMock.mockResolvedValueOnce(
      new Response('{"messages":[{"id":"x"}]}', { status: 200 })
    )
    await sendWhatsAppMessage('+60 12-345 6789', 'ims_incident_alert', ['a'], 'pid', 'tok')
    const body = JSON.parse(fetchMock.mock.calls[0][1].body)
    expect(body.to).toBe('60123456789')
  })
})