// Юнит-тесты слоя 2 (фронт): putToVm + uploadViaVM с моками XMLHttpRequest и fetch.
// Запуск: node upload/frontend/test_upload_layer2.mjs

import assert from 'node:assert/strict';

// ── Полифилл File (Node 18 не имеет global File) ──
if (typeof globalThis.File === 'undefined') {
  globalThis.File = class File extends Blob {
    constructor(parts, name, opts) {
      super(parts, opts);
      this.name = name;
      this.lastModified = (opts && opts.lastModified) || Date.now();
    }
  };
}

import { putToVm } from './upload/put_to_vm.js';
import { uploadViaVM } from './upload/upload_via_vm.js';

const tick = () => new Promise(r => setTimeout(r, 0));

// Node 18 не имеет globalThis.crypto (в браузере есть) — заглушка для uploadViaVM
globalThis.crypto = globalThis.crypto || { randomUUID: () => 'test-uuid-1234' };

// ── мок XMLHttpRequest ──
let lastXHR = null;
class FakeXHR {
  constructor() {
    this.upload = {};
    this.status = 0;
    this.timeout = 0;
    this.onload = null;
    this.onerror = null;
    this.ontimeout = null;
    this.method = null;
    this.url = null;
    this.body = null;
    lastXHR = this;
  }
  open(method, url) { this.method = method; this.url = url; }
  send(body) { this.body = body; }
}
globalThis.XMLHttpRequest = FakeXHR;

// ── мок fetch ──
let fetchCalls = [];
function installFetch(respond) {
  fetchCalls = [];
  globalThis.fetch = async (url, opts) => {
    fetchCalls.push({ url, opts });
    return respond();
  };
}

// ── putToVm ──
async function testPutToVmSuccess() {
  const f = new File(['abc'], 'a.txt');
  const p = putToVm(f, 'https://vm/tok_0');
  lastXHR.status = 200;
  lastXHR.onload();
  await p;
  assert.equal(lastXHR.method, 'PUT');
  assert.equal(lastXHR.url, 'https://vm/tok_0');
  assert.equal(lastXHR.body, f);
  console.log('  putToVm success: ok');
}

async function testPutToVmHttpError() {
  const p = putToVm(new File(['abc'], 'a.txt'), 'https://vm/tok_0');
  lastXHR.status = 500;
  lastXHR.onload();
  await assert.rejects(p, /ВМ: HTTP 500/);
  console.log('  putToVm HTTP error: ok');
}

async function testPutToVmNetworkError() {
  const p = putToVm(new File(['abc'], 'a.txt'), 'https://vm/tok_0');
  lastXHR.onerror();
  await assert.rejects(p, /Сеть/);
  console.log('  putToVm network error: ok');
}

async function testPutToVmTimeout() {
  const p = putToVm(new File(['abc'], 'a.txt'), 'https://vm/tok_0');
  lastXHR.ontimeout();
  await assert.rejects(p, /Таймаут/);
  console.log('  putToVm timeout: ok');
}

async function testPutToVmOnXHR() {
  let registered = null;
  const p = putToVm(new File(['abc'], 'a.txt'), 'https://vm/tok_0', { onXHR(x) { registered = x; } });
  assert.ok(registered, 'onXHR должен получить XHR для отмены');
  registered.status = 200;
  registered.onload();
  await p;
  console.log('  putToVm onXHR регистрация: ok');
}

// ── uploadViaVM ──
async function testUploadViaVMSuccess() {
  installFetch(() => ({ ok: true, json: async () => ({ ok: true, session: 'sid123', count: 2 }) }));
  const files = [new File(['a'], 'a.txt'), new File(['bb'], 'b.txt')];
  const p = uploadViaVM(files, 'https://vm/', { session: '' });
  await tick();
  lastXHR.status = 200; lastXHR.onload();
  await tick();
  lastXHR.status = 200; lastXHR.onload();
  const res = await p;
  assert.equal(res.ok, true);
  assert.equal(res.session, 'sid123');
  assert.equal(res.count, 2);
  assert.equal(fetchCalls.length, 1);
  const body = JSON.parse(fetchCalls[0].opts.body);
  assert.equal(body.files.length, 2);
  assert.equal(body.files[0].name, 'a.txt');
  assert.equal(body.files[1].name, 'b.txt');
  assert.ok(body.files[0].url.startsWith('https://vm/'));
  console.log('  uploadViaVM success: ok');
}

async function testUploadViaVMPutError() {
  installFetch(() => ({ ok: true, json: async () => ({}) }));
  const files = [new File(['a'], 'a.txt'), new File(['bb'], 'b.txt')];
  const p = uploadViaVM(files, 'https://vm/', { session: '' });
  await tick();
  lastXHR.onerror();  // первый PUT падает
  const res = await p;
  assert.equal(res.ok, false);
  assert.ok(res.error.includes('Ошибка загрузки на ВМ'));
  assert.equal(fetchCalls.length, 0);  // POST не вызван
  console.log('  uploadViaVM PUT error: ok');
}

async function testUploadViaVMPostError() {
  installFetch(() => ({ ok: true, json: async () => ({ ok: false, error: 'Session not found' }) }));
  const files = [new File(['a'], 'a.txt')];
  const p = uploadViaVM(files, 'https://vm/', { session: '' });
  await tick();
  lastXHR.status = 200; lastXHR.onload();
  const res = await p;
  assert.equal(res.ok, false);
  assert.ok(res.error.includes('Ошибка передачи ссылок'));
  console.log('  uploadViaVM POST error: ok');
}

async function testUploadViaVMProgress() {
  installFetch(() => ({ ok: true, json: async () => ({ ok: true, session: 's', count: 1 }) }));
  const statuses = [];
  const texts = [];
  const files = [new File(['abc'], 'a.txt')];
  const p = uploadViaVM(files, 'https://vm/', {
    session: '',
    onStatus(k, html) { statuses.push({ k, html }); },
    onUploadStatus(t) { texts.push(t); },
  });
  await tick();
  lastXHR.status = 200; lastXHR.onload();
  await p;
  assert.ok(statuses.some(s => s.html.includes('✓')));
  assert.ok(texts.some(t => t.includes('Загрузка на ВМ')));
  assert.ok(texts.some(t => t.includes('Передача ссылок')));
  console.log('  uploadViaVM progress/статусы: ok');
}

async function testUploadViaVMSessionPassed() {
  // session из options пробрасывается в POST-тело
  installFetch(() => ({ ok: true, json: async () => ({ ok: true, session: 'prev', count: 1 }) }));
  const files = [new File(['a'], 'a.txt')];
  const p = uploadViaVM(files, 'https://vm/', { session: 'existingsid' });
  await tick();
  lastXHR.status = 200; lastXHR.onload();
  await p;
  const body = JSON.parse(fetchCalls[0].opts.body);
  assert.equal(body.session, 'existingsid');
  console.log('  uploadViaVM проброс session: ok');
}

// ── прогон ──
const TESTS = [
  ['putToVm success', testPutToVmSuccess],
  ['putToVm HTTP error', testPutToVmHttpError],
  ['putToVm network error', testPutToVmNetworkError],
  ['putToVm timeout', testPutToVmTimeout],
  ['putToVm onXHR', testPutToVmOnXHR],
  ['uploadViaVM success', testUploadViaVMSuccess],
  ['uploadViaVM PUT error', testUploadViaVMPutError],
  ['uploadViaVM POST error', testUploadViaVMPostError],
  ['uploadViaVM progress', testUploadViaVMProgress],
  ['uploadViaVM проброс session', testUploadViaVMSessionPassed],
];

let failed = 0;
for (const [name, fn] of TESTS) {
  try { await fn(); console.log('PASS ' + name); }
  catch (e) { failed++; console.error('FAIL ' + name + ': ' + e.message); }
}
if (failed) { console.error(failed + ' тестов упало'); process.exit(1); }
console.log('Все тесты слоя 2 (фронт) прошли');