import assert from 'node:assert/strict';
import { chromium } from '@playwright/test';
import { mkdtemp, open, rm, stat, readFile } from 'node:fs/promises';
import { resolve } from 'node:path';
import { tmpdir } from 'node:os';
import { createApp } from '../../apps/server/src/app.ts';
import { loadConfig } from '../../apps/server/src/config.ts';
const folder = await mkdtemp(resolve(tmpdir(), 'hop-chunks-'));
const runtime = await createApp({
  ...loadConfig({
    APP_URL: 'http://127.0.0.1',
    DATABASE_PATH: resolve(folder, 'db.sqlite'),
    UPLOAD_DIR: resolve(folder, 'uploads'),
    MIN_FREE_DISK_MB: '0',
    SESSION_SECRET: 's'.repeat(40),
    DISCOVERY_SECRET: 'd'.repeat(40),
  }),
  webRoot: resolve('apps/web/dist'),
});
let browser;
try {
  await runtime.app.listen({ host: '127.0.0.1', port: 0 });
  const url = `http://127.0.0.1:${runtime.app.server.address().port}`;
  runtime.setDevOrigin(url);
  browser = await chromium.launch({
    headless: true,
    ...(process.env.HOP_BROWSER_EXECUTABLE
      ? { executablePath: process.env.HOP_BROWSER_EXECUTABLE }
      : {}),
  });
  const a = await browser.newContext(),
    b = await browser.newContext();
  const sender = await a.newPage(),
    receiver = await b.newPage(),
    errors = [];
  for (const page of [sender, receiver])
    page.on('pageerror', (error) => errors.push(error.message));
  await Promise.all([sender.goto(url), receiver.goto(url)]);
  await sender.locator('.peer-card').first().waitFor();
  await receiver.locator('.peer-card').first().waitFor();
  const size = 101 * 1024 * 1024 + 23,
    source = resolve(folder, 'over-100MiB.bin');
  const file = await open(source, 'w');
  await file.truncate(size);
  await file.write(Buffer.from('actual large transfer'), 0, 21, size - 21);
  await file.close();
  let lostReply = false;
  let failedAttempts = 0,
    allowRetry = false;
  const sizes = [],
    offsets = [];
  await sender.route('**/api/uploads/resumable/*', async (route) => {
    if (route.request().method() !== 'PUT') return route.continue();
    const bytes = route.request().postDataBuffer();
    if (lostReply && !allowRetry && failedAttempts < 3) {
      failedAttempts++;
      return route.abort('failed');
    }
    sizes.push(bytes.length);
    offsets.push(Number(route.request().headers()['upload-offset']));
    // Emulate a proxy with a per-request cap, and lose an acknowledged chunk response.
    if (bytes.length > 9 * 1024 * 1024) return route.fulfill({ status: 413, body: '{}' });
    if (!lostReply) {
      await route.fetch();
      lostReply = true;
      return route.abort('failed');
    }
    return route.continue();
  });
  await sender.locator('.peer-card').first().click();
  await sender.locator('input[type=file]').setInputFiles(source);
  await sender.getByRole('button', { name: '전송하기', exact: true }).click();
  const downloaded = receiver.waitForEvent('download', { timeout: 120000 });
  void downloaded.catch(() => {});
  await receiver.getByRole('button', { name: '수락', exact: true }).click();
  const retry = sender.getByRole('button', { name: '다시 전송', exact: true });
  await retry.waitFor({ timeout: 30000 });
  assert.equal(failedAttempts, 3);
  allowRetry = true;
  await retry.click();
  const download = await downloaded,
    path = await download.path();
  assert.equal((await stat(path)).size, size);
  const handle = await open(path, 'r'),
    tail = Buffer.alloc(21);
  await handle.read(tail, 0, 21, size - 21);
  await handle.close();
  assert.equal(tail.toString(), 'actual large transfer');
  assert.equal(sizes.length, 13);
  assert(sizes.every((value) => value <= 8 * 1024 * 1024));
  assert.equal(offsets[0], 0);
  assert.equal(offsets[1], 8 * 1024 * 1024, '응답이 유실돼도 이미 받은 조각을 다시 전송하지 않음');
  assert.equal(
    sizes.reduce((sum, value) => sum + value, 0),
    size,
  );
  await sender.locator('.send-dialog').waitFor({ state: 'hidden' });
  assert.equal(errors.length, 0, errors.join('\n'));
  console.log(
    'PASS: 두 실제 브라우저 자동 발견, 101MiB 파일의 8MiB 분할, 요청 크기 제한, 응답 유실 후 이어 보내기, 수락 후 자동 다운로드, 원본 크기·내용 검증',
  );
} finally {
  await browser?.close();
  await runtime.app.close();
  await rm(folder, { recursive: true, force: true });
}