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

import request from 'supertest'

import { NextFunction, Request, Response } from 'express'

import { createApp } from '@app/createApp'

import { errorHandler } from '@app/middleware/errorHandler'

import { DomainError } from '@app/lib/errors/base'

const app = createApp()

function buildRequest() {

  return { log: { error: vi.fn() } }

}

function buildResponse() {

  return {

    status: vi.fn().mockReturnThis(),

    json: vi.fn().mockReturnThis(),

  }

}

describe('errorHandler', () => {

  it('returns 500 for an error that reaches it through the app', async () => {

    const res = await request(app)

      .post('/auth/login')

      .set('Content-Type', 'application/json')

      .send('{"email": ')

    expect(res.status).toBe(500)

    expect(res.body).toEqual({ error: 'Internal server error' })

  })

  it('logs the error through the request logger', () => {

    const req = buildRequest()

    const res = buildResponse()

    const err = new Error('kaboom')

    errorHandler(

      err,

      req as unknown as Request,

      res as unknown as Response,

      vi.fn() as unknown as NextFunction,

    )

    expect(req.log.error).toHaveBeenCalledWith({ err }, 'request failed')

    expect(res.status).toHaveBeenCalledWith(500)

  })

  it('maps domain errors to their status and message', () => {

    const req = buildRequest()

    const res = buildResponse()

    errorHandler(

      new DomainError('nope', 409),

      req as unknown as Request,

      res as unknown as Response,

      vi.fn() as unknown as NextFunction,

    )

    expect(res.status).toHaveBeenCalledWith(409)

    expect(res.json).toHaveBeenCalledWith({ error: 'nope' })

  })

})