const request = require('supertest');
const path = require('path');
const fs = require('fs');
const os = require('os');
const { app } = require('../src/app');
const services = require('../src/services');
jest.mock('../src/services'); // jest uses fake/dummy functions instead of the real ones

describe('POST /api/documents', () => {
  let dummyFileExcel;
  let dummyFilePdf;
  beforeAll(() => {
    dummyFileExcel = path.join(os.tmpdir(), 'test_file.xlsx');
    dummyFilePdf = path.join(os.tmpdir(), 'test_file.pdf');

    fs.writeFileSync(dummyFileExcel, 'dummy file excel content');
    fs.writeFileSync(dummyFilePdf, 'dummy pdf file content');
  });

  afterAll(() => {
    if (fs.existsSync(dummyFileExcel)) fs.unlinkSync(dummyFileExcel);
    if (fs.existsSync(dummyFilePdf)) fs.unlinkSync(dummyFilePdf);
  });

  it('should process files and return status 200 when helpers succeed', async() => {
    // this tells the fake functions what to return
    services.splitExcelFile.mockResolvedValue(5); // Returns 5 rows
    services.splitPDF.mockResolvedValue(['/tmp/page1.pdf']); // Returns 1 temp file
    services.initializeSalesforceConnection.mockResolvedValue(); // Simulates success
    services.attachPdfToAccount.mockResolvedValue(); // Simulates success

    // this makes test request to Express
    const response = await request(app)
      .post('/api/documents')
      .field('title', 'Quarterly Report')
      .attach('documents', dummyFileExcel)
      .attach('documents', dummyFilePdf);

      // assertions => verify express responded properly and called our service
    expect(response.statusCode).toBe(200);
    expect(response.body).toEqual({
      ok: true,
      message: 'Files uploaded successfully!'
    });

    // Verify helpers were actually called
    expect(services.splitExcelFile).toHaveBeenCalledTimes(1);
    expect(services.splitPDF).toHaveBeenCalledTimes(1);
    expect(services.initializeSalesforceConnection).toHaveBeenCalledTimes(1);
    expect(services.cleanUp).toHaveBeenCalledTimes(2);
  })
});