'use strict';

const R = require('../../utils/response.util');

function makeRes() {
  const res = {
    _status: null,
    _body: null,
    status(code) { this._status = code; return this; },
    json(body)   { this._body  = body;  return this; },
  };
  return res;
}

// ── R.success ─────────────────────────────────────────────────────────────────

describe('R.success()', () => {
  test('default status is 200', () => {
    const res = makeRes();
    R.success(res, 'OK');
    expect(res._status).toBe(200);
  });

  test('envelope shape: status=success, message, data', () => {
    const res = makeRes();
    R.success(res, 'Created', { id: 1 }, 201);
    expect(res._body).toEqual({ status: 'success', message: 'Created', data: { id: 1 } });
  });

  test('custom status code is used', () => {
    const res = makeRes();
    R.success(res, 'Created', null, 201);
    expect(res._status).toBe(201);
  });

  test('data is null when omitted', () => {
    const res = makeRes();
    R.success(res, 'OK');
    expect(res._body.data).toBeNull();
  });
});

// ── R.error ───────────────────────────────────────────────────────────────────

describe('R.error()', () => {
  test('default status is 500', () => {
    const res = makeRes();
    R.error(res, 'Something broke');
    expect(res._status).toBe(500);
  });

  test('envelope shape: status=error, message', () => {
    const res = makeRes();
    R.error(res, 'Not found', 404);
    expect(res._body).toMatchObject({ status: 'error', message: 'Not found' });
    expect(res._status).toBe(404);
  });

  test('errors field is absent when not provided', () => {
    const res = makeRes();
    R.error(res, 'Bad request', 400);
    expect(res._body).not.toHaveProperty('errors');
  });

  test('errors field is included when provided', () => {
    const res  = makeRes();
    const errs = [{ field: 'email', msg: 'Invalid' }];
    R.error(res, 'Validation failed', 422, errs);
    expect(res._body.errors).toEqual(errs);
  });
});

// ── R.validationError ─────────────────────────────────────────────────────────

describe('R.validationError()', () => {
  test('status is always 422', () => {
    const res = makeRes();
    R.validationError(res, []);
    expect(res._status).toBe(422);
  });

  test('envelope shape: status=error, message=Validation failed, errors', () => {
    const res  = makeRes();
    const errs = [{ field: 'name', msg: 'Required' }];
    R.validationError(res, errs);
    expect(res._body).toEqual({
      status:  'error',
      message: 'Validation failed',
      errors:  errs,
    });
  });
});