import { describe, it, expect, vi, beforeEach } from 'vitest'
import { NextRequest } from 'next/server'
import { createHmac } from 'crypto'

const SECRET = 'test-hmac-secret' // matches vitest.setup.ts

const mockPayloadFind = vi.fn()
const mockPayloadUpdate = vi.fn()
const mockGetPayload = vi.fn(() => ({
  find: mockPayloadFind,
  update: mockPayloadUpdate,
}))

vi.mock('payload', () => ({ getPayload: mockGetPayload }))
vi.mock('@payload-config', () => ({ default: {} }))

function makeSignature(body: string): string {
  return createHmac('sha256', SECRET).update(body).digest('hex')
}

function makeRequest(body: string, signature: string): NextRequest {
  return new NextRequest('http://localhost/api/binotel/webhook', {
    method: 'POST',
    body,
    headers: {
      'content-type': 'text/plain',
      'x-binotel-signature': signature,
    },
  })
}

let POST: (req: NextRequest) => Promise<Response>

beforeEach(async () => {
  vi.resetModules()
  mockPayloadFind.mockReset()
  mockPayloadUpdate.mockReset()
  vi.stubEnv('BINOTEL_HMAC_SECRET', SECRET)
  const mod = await import('@/app/api/binotel/webhook/route')
  POST = mod.POST
})

describe('POST /api/binotel/webhook', () => {
  it('returns 401 for invalid HMAC signature', async () => {
    const req = makeRequest('{"externalNumber":"0501234567"}', 'bad-signature')
    const res = await POST(req)
    expect(res.status).toBe(401)
  })

  it('returns 400 for valid signature but invalid JSON body', async () => {
    const body = 'not json'
    const req = makeRequest(body, makeSignature(body))
    const res = await POST(req)
    expect(res.status).toBe(400)
  })

  it('returns ok:true when externalNumber is missing from payload', async () => {
    const body = JSON.stringify({ event: 'call' })
    const req = makeRequest(body, makeSignature(body))
    const res = await POST(req)
    const json = await res.json()
    expect(res.status).toBe(200)
    expect(json.ok).toBe(true)
    expect(mockPayloadFind).not.toHaveBeenCalled()
  })

  it('returns ok:true when externalNumber is not a string', async () => {
    const body = JSON.stringify({ externalNumber: 12345 })
    const req = makeRequest(body, makeSignature(body))
    const res = await POST(req)
    expect((await res.json()).ok).toBe(true)
  })

  it('returns ok:true when phone cannot be normalized', async () => {
    const body = JSON.stringify({ externalNumber: 'INVALID' })
    const req = makeRequest(body, makeSignature(body))
    const res = await POST(req)
    expect((await res.json()).ok).toBe(true)
    expect(mockPayloadFind).not.toHaveBeenCalled()
  })

  it('updates lead lastCallAt when matching lead is found', async () => {
    mockPayloadFind.mockResolvedValueOnce({ docs: [{ id: 'lead-42' }] })
    mockPayloadUpdate.mockResolvedValueOnce({})

    const body = JSON.stringify({ externalNumber: '0501234567' })
    const req = makeRequest(body, makeSignature(body))
    const res = await POST(req)

    expect(res.status).toBe(200)
    expect(mockPayloadFind).toHaveBeenCalledWith(
      expect.objectContaining({
        collection: 'leads',
        where: { phone: { equals: '+380501234567' } },
      })
    )
    expect(mockPayloadUpdate).toHaveBeenCalledWith(
      expect.objectContaining({
        collection: 'leads',
        id: 'lead-42',
        data: expect.objectContaining({ lastCallAt: expect.any(String) }),
      })
    )
  })

  it('returns ok:true when no matching lead is found (no update)', async () => {
    mockPayloadFind.mockResolvedValueOnce({ docs: [] })

    const body = JSON.stringify({ externalNumber: '0501234567' })
    const req = makeRequest(body, makeSignature(body))
    const res = await POST(req)

    expect(res.status).toBe(200)
    expect(mockPayloadUpdate).not.toHaveBeenCalled()
  })

  it('returns ok:true even when the DB call throws', async () => {
    mockPayloadFind.mockRejectedValueOnce(new Error('DB down'))

    const body = JSON.stringify({ externalNumber: '0501234567' })
    const req = makeRequest(body, makeSignature(body))
    const res = await POST(req)

    expect(res.status).toBe(200)
    expect((await res.json()).ok).toBe(true)
  })

  it('returns 500 when BINOTEL_HMAC_SECRET is not configured', async () => {
    vi.stubEnv('BINOTEL_HMAC_SECRET', '')
    vi.resetModules()
    const mod = await import('@/app/api/binotel/webhook/route')
    const body = JSON.stringify({ externalNumber: '0501234567' })
    const req = makeRequest(body, makeSignature(body))
    const res = await mod.POST(req)
    expect(res.status).toBe(500)
  })
})