#!/usr/bin/env node
// Acceptation P1 (sans navigateur, sans quota Claude) : vrai daemon + vrai client WS.
// Couvre : login, hello, sub, spawn bash, attach+replay, stdin/output, flood 10 Mo
// avec flow control par ACK + RSS borné, déconnexion/reconnexion+replay, kill, drain.
import { spawn } from 'node:child_process';
import { mkdtempSync, readFileSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const WebSocket = require('ws');

const PORT = 7541;
const ORIGIN = `http://127.0.0.1:${PORT}`;
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
const serverDir = join(dirname(fileURLToPath(import.meta.url)), '..');
const results = [];
const check = (name, ok, detail = '') => {
  results.push({ name, ok, detail });
  console.log(`${ok ? '✅' : '❌'} ${name}${detail ? ` — ${detail}` : ''}`);
};

const tmp = mkdtempSync(join(tmpdir(), 'arb-accept-'));
const srv = spawn('node', [join(serverDir, 'dist', 'index.js'), '--port', String(PORT), '--db', join(tmp, 'a.db')], {
  env: { ...process.env, ARBORETUM_LOG: 'warn' },
  stdio: ['ignore', 'pipe', 'pipe'],
});
let srvOut = '';
srv.stdout.on('data', (d) => (srvOut += d));
srv.stderr.on('data', (d) => (srvOut += d));

try {
  await sleep(1500);
  const token = /arb_[0-9a-f]+/.exec(srvOut)?.[0];
  check('boot + token bootstrap', !!token);

  const login = await fetch(`${ORIGIN}/api/v1/auth/login`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', Origin: ORIGIN },
    body: JSON.stringify({ token }),
  });
  const cookie = login.headers.get('set-cookie')?.split(';')[0] ?? '';
  check('login → cookie', login.status === 200 && cookie.startsWith('arb_session='));

  // Client WS minimal multiplexé
  function wsClient() {
    const ws = new WebSocket(`ws://127.0.0.1:${PORT}/ws`, { headers: { Origin: ORIGIN, Cookie: cookie } });
    ws.binaryType = 'arraybuffer';
    const state = { msgs: [], outputs: new Map(), resyncs: new Map(), bytes: new Map() };
    ws.on('message', (data, isBinary) => {
      if (!isBinary) {
        state.msgs.push(JSON.parse(String(data)));
        return;
      }
      const buf = Buffer.from(data);
      const type = buf.readUInt8(0);
      const channel = buf.readUInt32LE(1);
      const payload = buf.subarray(5);
      if (type === 0x02) {
        state.resyncs.set(channel, (state.resyncs.get(channel) ?? 0) + 1);
        state.bytes.set(channel, 0); // resync : le compteur ACK repart de zéro
        state.outputs.set(channel, payload.toString('latin1'));
      } else {
        state.outputs.set(channel, ((state.outputs.get(channel) ?? '') + payload.toString('latin1')).slice(-300000));
        const total = (state.bytes.get(channel) ?? 0) + payload.length;
        state.bytes.set(channel, total);
        // ACK tous les 64 Kio traités (invariant : pas d'ACK <= LOW_WATERMARK)
        const acked = state.lastAck?.get(channel) ?? 0;
        if (total - acked >= 64 * 1024) {
          (state.lastAck ??= new Map()).set(channel, total);
          ws.send(JSON.stringify({ type: 'ack', channel, bytes: total }));
        }
      }
    });
    const waitMsg = async (pred, timeout = 8000) => {
      const t0 = Date.now();
      while (Date.now() - t0 < timeout) {
        const m = state.msgs.find(pred);
        if (m) return m;
        await sleep(50);
      }
      return null;
    };
    return { ws, state, waitMsg, send: (m) => ws.send(JSON.stringify(m)) };
  }

  const c1 = wsClient();
  await new Promise((res, rej) => (c1.ws.on('open', res), c1.ws.on('error', rej)));
  c1.send({ type: 'hello', protocol: 1 });
  check('hello_ok', !!(await c1.waitMsg((m) => m.type === 'hello_ok')));
  c1.send({ type: 'sub', topics: ['sessions'] });

  // Spawn bash + attach
  const created = await fetch(`${ORIGIN}/api/v1/sessions`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', Origin: ORIGIN, Cookie: cookie },
    body: JSON.stringify({ cwd: tmp, command: 'bash' }),
  });
  const sid = (await created.json()).session.id;
  check('spawn bash', created.status === 201 && !!sid);

  c1.send({ type: 'attach', sessionId: sid, mode: 'interactive', cols: 120, rows: 32 });
  const att = await c1.waitMsg((m) => m.type === 'attached');
  check('attach interactif + controlling', att?.controlling === true);
  const ch = att.channel;

  // stdin → output
  await sleep(400);
  c1.send({ type: 'stdin', channel: ch, data: 'echo ACCEPT-$((21*2))\r' });
  await sleep(800);
  check('stdin → output', (c1.state.outputs.get(ch) ?? '').includes('ACCEPT-42'));

  // Flood 10 Mo (base64 → ~14 Mo de flux TTY) avec ACK, RSS serveur borné
  const rssBefore = readFileSync(`/proc/${srv.pid}/status`, 'utf8').match(/VmRSS:\s+(\d+) kB/)?.[1];
  c1.send({ type: 'stdin', channel: ch, data: 'head -c 10485760 /dev/urandom | base64; echo FLOOD-END-MARKER\r' });
  const t0 = Date.now();
  let floodOk = false;
  let received = 0;
  while (Date.now() - t0 < 60000) {
    received = c1.state.bytes.get(ch) ?? 0;
    if ((c1.state.outputs.get(ch) ?? '').includes('FLOOD-END-MARKER')) {
      floodOk = true;
      break;
    }
    await sleep(100);
  }
  const rssAfter = readFileSync(`/proc/${srv.pid}/status`, 'utf8').match(/VmRSS:\s+(\d+) kB/)?.[1];
  const rssMb = Math.round((Number(rssAfter) - Number(rssBefore)) / 1024);
  check('flood 10 Mo complet via ACK', floodOk && received > 13_000_000, `${(received / 1048576).toFixed(1)} Mo reçus en ${Date.now() - t0} ms`);
  check('RSS serveur borné pendant le flood', Number(rssAfter) < 300 * 1024, `Δ ${rssMb} Mo (RSS ${Math.round(Number(rssAfter) / 1024)} Mo)`);

  // Déconnexion brutale → la session survit → reconnexion + replay
  c1.ws.terminate();
  await sleep(2000);
  const c2 = wsClient();
  await new Promise((res, rej) => (c2.ws.on('open', res), c2.ws.on('error', rej)));
  c2.send({ type: 'hello', protocol: 1 });
  await c2.waitMsg((m) => m.type === 'hello_ok');
  c2.send({ type: 'attach', sessionId: sid, mode: 'interactive', cols: 100, rows: 30 });
  const att2 = await c2.waitMsg((m) => m.type === 'attached');
  await sleep(500);
  const replay = c2.state.outputs.get(att2.channel) ?? '';
  check('reconnexion : session vivante + replay', att2?.controlling === true && c2.state.resyncs.get(att2.channel) === 1 && replay.length > 1000, `replay ${(replay.length / 1024).toFixed(0)} Kio`);
  c2.send({ type: 'stdin', channel: att2.channel, data: 'echo AFTER-RECONNECT\r' });
  await sleep(800);
  check('terminal utilisable après reconnexion', (c2.state.outputs.get(att2.channel) ?? '').includes('AFTER-RECONNECT'));

  // Kill + notification session_exit (sub)
  c2.send({ type: 'sub', topics: ['sessions'] });
  await fetch(`${ORIGIN}/api/v1/sessions/${sid}`, { method: 'DELETE', headers: { Origin: ORIGIN, Cookie: cookie } });
  const exited = await c2.waitMsg((m) => m.type === 'session_exit' && m.sessionId === sid, 8000);
  const detached = await c2.waitMsg((m) => m.type === 'detached' && m.reason === 'session_exit', 8000);
  check('kill → session_exit + detached broadcast', !!exited && !!detached);
  c2.ws.close();
} catch (err) {
  check('exception', false, String(err));
} finally {
  srv.kill('SIGTERM');
  await sleep(1500);
  check('arrêt propre du daemon (SIGTERM)', srv.exitCode === 0 || srv.signalCode === null || srv.exitCode === null);
  rmSync(tmp, { recursive: true, force: true });
  const failed = results.filter((r) => !r.ok);
  console.log(failed.length === 0 ? '\nACCEPTANCE P1: ALL GREEN' : `\nACCEPTANCE P1: ${failed.length} FAILURE(S)`);
  process.exit(failed.length === 0 ? 0 : 1);
}