import assert from 'node:assert/strict';
import { execFileSync } from 'node:child_process';
import { once } from 'node:events';
import { mkdtempSync, rmSync } from 'node:fs';
import { createServer } from 'node:http';
import { createConnection } from 'node:net';
import { tmpdir } from 'node:os';
import { dirname, join, resolve } from 'node:path';
import test from 'node:test';
import { fileURLToPath } from 'node:url';
import Fastify from 'fastify';
import sensible from '@fastify/sensible';
import { WebSocket, WebSocketServer } from 'ws';

const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
const directory = mkdtempSync(join(tmpdir(), 'sybil-agent-'));
process.env.DATABASE_URL = `file:${join(directory, 'agent.db')}`;
process.env.ADMIN_TOKEN = 'sybil-test-token-0123456789';
execFileSync(process.execPath, [join(root, 'node_modules/prisma/build/index.js'), 'migrate', 'deploy'], {
  cwd: root, env: { ...process.env, PRISMA_HIDE_UPDATE_MESSAGE: '1' }, stdio: 'pipe',
});
const [{ registerAgentRoutes }, { prisma }, { env }] = await Promise.all([
  import('../src/agent.js'), import('../src/db.js'), import('../src/env.js'),
]);
const auth = { authorization: `Bearer ${process.env.ADMIN_TOKEN}` };
const privateKey = 'sybil-agent-private-key-for-test';
const requests: { method?: string; url?: string; body: any }[] = [];
const accepted = new Map<string, number>();
let upstreamReply: { status: number; body: string } | undefined;
let connections = 0;
const subscriptions: any[] = [];
const upstream = createServer(async (req, res) => {
  assert.equal(req.headers.authorization, `Bearer ${privateKey}`);
  const chunks = [];
  for await (const chunk of req) chunks.push(chunk);
  const body = chunks.length ? JSON.parse(Buffer.concat(chunks).toString()) : null;
  requests.push({ method: req.method, url: req.url, body });
  res.setHeader('Content-Type', 'application/json');
  if (upstreamReply) { res.statusCode = upstreamReply.status; res.end(upstreamReply.body); return; }
  if (req.method === 'POST') {
    const id = accepted.get(body.requestId) || accepted.size + 1; accepted.set(body.requestId, id);
    res.statusCode = 202; res.end(JSON.stringify({ id, status: 'queued', messageId: `inbound:sybil:${body.requestId}` }));
  } else if (req.url?.includes('/messages')) {
    res.end(JSON.stringify({ conversationId: '1', messages: [{ id: 'outbound:43', role: 'assistant', content: 'Later result' }], cursor: '43', beforeCursor: '43', hasMore: false }));
  } else res.end(JSON.stringify({ id: '1', type: 'persistent-agent', title: 'Sybil Agent', websocket: '/api/ws', protocol: 'pi-room.v1', activity: { thinking: true } }));
});
const sourceSockets = new WebSocketServer({ noServer: true });
upstream.on('upgrade', (req, socket, head) => {
  assert.equal(req.headers.authorization, `Bearer ${privateKey}`);
  assert.equal(req.url, '/api/ws');
  connections++;
  sourceSockets.handleUpgrade(req, socket, head, ws => {
    ws.on('message', raw => {
      const frame = JSON.parse(raw.toString()); subscriptions.push(frame);
      ws.send(JSON.stringify({ type: 'ready', protocol: 'pi-room.v1', conversationId: '1' }));
      ws.send(JSON.stringify({ type: 'messages', conversationId: '1', messages: [{ id: 'outbound:43', role: 'assistant', content: 'Later result' }], cursor: '43', hasMore: false }));
      ws.send(JSON.stringify({ type: 'activity', conversationId: '1', activity: { thinking: true, responding: true } }));
    });
  });
});
upstream.listen(0, '127.0.0.1'); await once(upstream, 'listening');
const upstreamAddress = upstream.address() as { port: number };
const app = Fastify({ logger: false }); await app.register(sensible);
await registerAgentRoutes(app, { baseUrl: `http://127.0.0.1:${upstreamAddress.port}`, apiKey: privateKey });
await app.listen({ port: 0, host: '127.0.0.1' });
const address = app.server.address() as { port: number };
const wsUrl = `ws://127.0.0.1:${address.port}/v1/agent/ws`;

test.after(async () => {
  await app.close();
  for (const socket of sourceSockets.clients) socket.terminate();
  sourceSockets.close();
  await new Promise<void>(resolve => upstream.close(() => resolve()));
  await prisma.$disconnect();
  rmSync(directory, { recursive: true, force: true });
});

async function eventually(check: () => boolean) {
  for (let i = 0; i < 100; i++) { if (check()) return; await new Promise(resolve => setTimeout(resolve, 10)); }
  assert.fail('Expected condition was not reached');
}

test('REST authenticates, proxies the shared room, and retains stable message IDs without revealing Sybil Agent credentials', async () => {
  assert.equal((await app.inject({ url: '/v1/agent' })).statusCode, 401);
  const descriptor = await app.inject({ url: '/v1/agent', headers: auth });
  assert.equal(descriptor.statusCode, 200);
  assert.equal(descriptor.json().websocket, '/v1/agent/ws');
  assert.ok(!descriptor.body.includes(privateKey));
  const page = await app.inject({ url: '/v1/agent/messages?after=42&limit=20', headers: auth });
  assert.equal(page.json().messages[0].role, 'assistant');
  assert.match(requests.at(-1)!.url!, /after=42&limit=20/);
  const input = { content: '  Keep watching\n', requestId: 'same-client-message' };
  const first = await app.inject({ method: 'POST', url: '/v1/agent/messages', headers: auth, payload: input });
  const second = await app.inject({ method: 'POST', url: '/v1/agent/messages', headers: auth, payload: input });
  assert.equal(first.statusCode, 202); assert.deepEqual(first.json(), second.json());
  assert.deepEqual(requests.at(-1)!.body, { ...input, channel: 'sybil', whenBusy: 'followUp', wait: false });
  assert.equal((await prisma.chat.count()), 0, 'Sybil Agent messages are not copied into ordinary Sybil chats');
  assert.equal((await app.inject({ url: '/v1/agent/messages?after=2&before=3', headers: auth })).statusCode, 400);
  assert.equal((await app.inject({ method: 'POST', url: '/v1/agent/messages', headers: auth, payload: { content: 'Hello' } })).statusCode, 400);
});

test('the read cursor stays monotonic under concurrent tabs and survives reconnecting to SQLite', async () => {
  const initial = await app.inject({ url: '/v1/agent/read-state', headers: auth });
  assert.equal(initial.json().cursor, '0');
  assert.equal(initial.headers['cache-control'], 'no-store');
  await Promise.all(['900', '4', '100', '12'].map(cursor => app.inject({ method: 'PUT', url: '/v1/agent/read-state', headers: auth, payload: { cursor } })));
  assert.equal((await app.inject({ url: '/v1/agent/read-state', headers: auth })).json().cursor, '900');
  await prisma.$disconnect();
  assert.equal((await app.inject({ method: 'PUT', url: '/v1/agent/read-state', headers: auth, payload: { cursor: '5' } })).json().cursor, '900');
  assert.equal((await app.inject({ method: 'PUT', url: '/v1/agent/read-state', headers: auth, payload: { cursor: '-1' } })).statusCode, 400);
});

test('malformed upstream JSON and unconfirmed message receipts return 502, preserving safe retries', async () => {
  const payload = { content: 'One durable message', requestId: 'invalid-receipt-retry' };
  try {
    upstreamReply = { status: 200, body: '{truncated' };
    for (const url of ['/v1/agent', '/v1/agent/messages']) {
      const response = await app.inject({ url, headers: auth });
      assert.equal(response.statusCode, 502);
      assert.equal(response.headers['cache-control'], 'no-store');
    }
    for (const body of ['{truncated', '{}', 'null', JSON.stringify({ id: 1, status: 'queued', messageId: 'wrong-message' }),
      JSON.stringify({ id: 1, status: 'unknown', messageId: `inbound:sybil:${payload.requestId}` })]) {
      upstreamReply = { status: 202, body };
      const response = await app.inject({ method: 'POST', url: '/v1/agent/messages', headers: auth, payload });
      assert.equal(response.statusCode, 502, body);
      assert.equal(response.headers['cache-control'], 'no-store');
    }
  } finally { upstreamReply = undefined; }
  const retry = await app.inject({ method: 'POST', url: '/v1/agent/messages', headers: auth, payload });
  assert.equal(retry.statusCode, 202);
  assert.equal(retry.json().messageId, `inbound:sybil:${payload.requestId}`);
});

test('malformed and unmatched upgrade targets close without crashing or opening Sybil Agent connections', async () => {
  const before = connections;
  const requestUpgrade = (target: string): Promise<string> => new Promise((resolve, reject) => {
    let response = '';
    const socket = createConnection({ host: '127.0.0.1', port: address.port }, () => {
      socket.write(`GET ${target} HTTP/1.1\r\nHost: localhost\r\nConnection: Upgrade\r\nUpgrade: websocket\r\nSec-WebSocket-Version: 13\r\nSec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n\r\n`);
    });
    socket.setTimeout(1000, () => socket.destroy(new Error('Upgrade rejection did not close the socket')));
    socket.on('data', chunk => { response += chunk.toString(); });
    socket.on('error', reject);
    socket.on('end', () => { socket.destroy(); resolve(response); });
  });
  assert.match(await requestUpgrade('http://['), /^HTTP\/1\.1 400 /);
  assert.match(await requestUpgrade('/v1/not-an-agent/ws'), /^HTTP\/1\.1 404 /);
  assert.match(await requestUpgrade('/v1/agent/ws?token=forbidden'), /^HTTP\/1\.1 400 /);
  assert.equal(connections, before);
  assert.equal((await app.inject({ url: '/v1/agent', headers: auth })).statusCode, 200);
});

test('WebSocket first-frame authentication gates the private connection and forwards resumable native frames', async () => {
  const before = connections;
  const denied = new WebSocket(wsUrl); await once(denied, 'open');
  denied.send(JSON.stringify({ type: 'auth', token: 'wrong' }));
  const [code] = await once(denied, 'close');
  assert.equal(code, 4401); assert.equal(connections, before);
  const browser = new WebSocket(wsUrl);
  const frames: any[] = []; browser.on('message', raw => frames.push(JSON.parse(raw.toString())));
  await once(browser, 'open'); browser.send(JSON.stringify({ type: 'auth', token: env.ADMIN_TOKEN, after: '42' }));
  await eventually(() => frames.some(frame => frame.type === 'activity'));
  assert.deepEqual(subscriptions.at(-1), { type: 'subscribe', after: '42' });
  assert.deepEqual(frames.map(frame => frame.type), ['ready', 'messages', 'activity']);
  assert.equal(frames[1].messages[0].content, 'Later result');
  assert.equal(frames[2].activity.thinking, true);
  assert.ok(!JSON.stringify(frames).includes(privateKey));
  browser.send(JSON.stringify({ type: 'subscribe', after: '43' }));
  await eventually(() => subscriptions.at(-1)?.after === '43');
  browser.close(); await once(browser, 'close');
  await eventually(() => sourceSockets.clients.size === 0);
});

test('open-mode WebSocket authentication accepts null and still keeps the Sybil Agent token server-side', async () => {
  const saved = env.ADMIN_TOKEN; env.ADMIN_TOKEN = undefined;
  try {
    const browser = new WebSocket(wsUrl); const frames: any[] = [];
    browser.on('message', raw => frames.push(JSON.parse(raw.toString())));
    await once(browser, 'open'); browser.send(JSON.stringify({ type: 'auth', token: null, after: '0' }));
    await eventually(() => frames.some(frame => frame.type === 'ready'));
    browser.close(); await once(browser, 'close');
  } finally { env.ADMIN_TOKEN = saved; }
});