/**
 * Tests for the live variant server.
 * Run with: node --test tests/live-server.test.mjs
 */

import { describe, it, before, after } from 'node:test';
import assert from 'node:assert/strict';
import { existsSync, mkdtempSync, readFileSync, writeFileSync, mkdirSync, rmSync } from 'node:fs';
import { join } from 'node:path';
import { tmpdir } from 'node:os';
import { execFileSync, execSync, spawn } from 'node:child_process';
import {
  getDesignSidecarPath,
  getLegacyLiveServerPath,
  getLegacyLiveSessionsDir,
  getLiveServerPath,
  getLiveSessionsDir,
} from '../skill/scripts/impeccable-paths.mjs';

const REPO_ROOT = process.cwd();
const SERVER_SCRIPT = join(REPO_ROOT, 'skill/scripts/live-server.mjs');
const COMPLETE_SCRIPT = join(REPO_ROOT, 'skill/scripts/live-complete.mjs');
// ---------------------------------------------------------------------------
// Helper: start/stop server for integration tests
// ---------------------------------------------------------------------------

function startServer(port = 8499, { cwd = REPO_ROOT } = {}) {
  return new Promise((resolve, reject) => {
    const proc = spawn('node', [SERVER_SCRIPT, '--port=' + port], {
      cwd,
      stdio: ['ignore', 'pipe', 'pipe'],
      env: { ...process.env },
    });
    let output = '';
    proc.stdout.on('data', (d) => {
      output += d.toString();
      if (output.includes('running on')) {
        // Read token from PID file
        try {
          const info = JSON.parse(readFileSync(getLiveServerPath(cwd), 'utf-8'));
          resolve({ proc, port: info.port, token: info.token, cwd });
        } catch {
          reject(new Error('Server started but PID file not readable'));
        }
      }
    });
    proc.stderr.on('data', (d) => { output += d.toString(); });
    proc.on('error', reject);
    setTimeout(() => reject(new Error('Server start timeout. Output: ' + output)), 5000);
  });
}

async function stopServer(port, token) {
  try {
    await fetch(`http://localhost:${port}/stop?token=${token}`);
  } catch { /* server already gone */ }
}

async function drainPolls(server) {
  let drained;
  do {
    const r = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=50&leaseMs=1`);
    drained = await r.json();
    if (drained.id) {
      await fetch(`http://localhost:${server.port}/poll`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ token: server.token, id: drained.id, type: 'done' }),
      });
    }
  } while (drained.type !== 'timeout');
}

// ---------------------------------------------------------------------------
// Server integration tests
// ---------------------------------------------------------------------------

describe('live-server integration', () => {
  let server;

  before(async () => {
    rmSync(getLiveSessionsDir(REPO_ROOT), { recursive: true, force: true });
    rmSync(getLegacyLiveSessionsDir(REPO_ROOT), { recursive: true, force: true });
    rmSync(getLiveServerPath(REPO_ROOT), { force: true });
    rmSync(getLegacyLiveServerPath(REPO_ROOT), { force: true });
    server = await startServer(8499);
  });

  after(async () => {
    if (server) {
      await stopServer(server.port, server.token);
      server.proc.kill();
    }
  });

  it('/health returns correct status', async () => {
    const res = await fetch(`http://localhost:${server.port}/health`);
    assert.equal(res.status, 200);
    const data = await res.json();
    assert.equal(data.status, 'ok');
    assert.equal(data.port, server.port);
    assert.equal(data.mode, 'variant');
    assert.equal(typeof data.hasProjectContext, 'boolean');
    assert.equal(data.connectedClients, 0);
  });

  it('/status returns durable recovery state', async () => {
    await drainPolls(server);
    const eventRes = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'generate',
        id: 'a1b2c3d5',
        action: 'impeccable',
        count: 1,
        pageUrl: '/',
        element: { outerHTML: '<button>Book</button>' },
      }),
    });
    assert.equal(eventRes.status, 200);

    const res = await fetch(`http://localhost:${server.port}/status?token=${server.token}`);
    assert.equal(res.status, 200);
    const data = await res.json();
    assert.equal(data.status, 'ok');
    assert.equal(data.activeSessions.some((s) => s.id === 'a1b2c3d5'), true);
    assert.equal(data.pendingEvents.some((e) => e.id === 'a1b2c3d5' && e.type === 'generate'), true);

    await drainPolls(server);
  });

  it('/live.js serves script with token injected', async () => {
    const res = await fetch(`http://localhost:${server.port}/live.js`);
    assert.equal(res.status, 200);
    assert.equal(res.headers.get('content-type'), 'application/javascript');
    const text = await res.text();
    assert.ok(text.includes('__IMPECCABLE_TOKEN__'));
    assert.ok(text.includes(server.token));
    assert.ok(text.includes('__IMPECCABLE_PORT__'));
    const sessionHelperIndex = text.indexOf('__IMPECCABLE_LIVE_SESSION__');
    const browserInitIndex = text.indexOf('__IMPECCABLE_LIVE_INIT__');
    assert.ok(sessionHelperIndex !== -1);
    assert.ok(browserInitIndex !== -1);
    assert.ok(
      sessionHelperIndex < browserInitIndex,
      'event=live_server.browser_helper_order actor=browser operation=load_live_js risk=session_helper_missing_before_browser_init expected=session helper before live init actual=' + sessionHelperIndex + ':' + browserInitIndex,
    );
  });

  it('/design-system.json reads DESIGN.md plus .impeccable/design.json', async () => {
    const tmp = mkdtempSync(join(tmpdir(), 'impeccable-design-system-'));
    let designServer;
    try {
      writeFileSync(join(tmp, 'DESIGN.md'), `---
name: Temp System
description: Temporary design context
colors: {}
---

# Temp System
`);
      const sidecarPath = getDesignSidecarPath(tmp);
      mkdirSync(join(tmp, '.impeccable'), { recursive: true });
      writeFileSync(sidecarPath, JSON.stringify({ version: 2, source: 'new-sidecar' }));

      designServer = await startServer(8520, { cwd: tmp });
      const res = await fetch(`http://localhost:${designServer.port}/design-system.json?token=${designServer.token}`);
      const data = await res.json();

      assert.equal(res.status, 200);
      assert.equal(data.hasMd, true);
      assert.equal(data.hasSidecar, true);
      assert.equal(data.parsed.frontmatter.name, 'Temp System');
      assert.equal(data.sidecar.source, 'new-sidecar');
    } finally {
      if (designServer) {
        await stopServer(designServer.port, designServer.token);
        designServer.proc.kill();
      }
      rmSync(tmp, { recursive: true, force: true });
    }
  });

  it('/design-system.json falls back to legacy root DESIGN.json', async () => {
    const tmp = mkdtempSync(join(tmpdir(), 'impeccable-design-system-legacy-'));
    let designServer;
    try {
      writeFileSync(join(tmp, 'DESIGN.md'), `---
name: Legacy System
description: Legacy design context
colors: {}
---

# Legacy System
`);
      writeFileSync(join(tmp, 'DESIGN.json'), JSON.stringify({ version: 2, source: 'legacy-sidecar' }));

      designServer = await startServer(8521, { cwd: tmp });
      const res = await fetch(`http://localhost:${designServer.port}/design-system.json?token=${designServer.token}`);
      const data = await res.json();

      assert.equal(res.status, 200);
      assert.equal(data.hasMd, true);
      assert.equal(data.hasSidecar, true);
      assert.equal(data.parsed.frontmatter.name, 'Legacy System');
      assert.equal(data.sidecar.source, 'legacy-sidecar');
    } finally {
      if (designServer) {
        await stopServer(designServer.port, designServer.token);
        designServer.proc.kill();
      }
      rmSync(tmp, { recursive: true, force: true });
    }
  });

  it('/detect.js serves the detection overlay', async () => {
    const res = await fetch(`http://localhost:${server.port}/detect.js`);
    // May 404 if detect-antipatterns-browser.js hasn't been built
    assert.ok(res.status === 200 || res.status === 404);
  });

  it('/poll returns timeout when no events queued', async () => {
    const res = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=500`);
    assert.equal(res.status, 200);
    const data = await res.json();
    assert.equal(data.type, 'timeout');
  });

  it('/poll rejects invalid token', async () => {
    const res = await fetch(`http://localhost:${server.port}/poll?token=wrong&timeout=100`);
    assert.equal(res.status, 401);
  });

  it('/stop rejects invalid token', async () => {
    const res = await fetch(`http://localhost:${server.port}/stop?token=wrong`);
    assert.equal(res.status, 401);
  });

  it('POST /events rejects invalid token', async () => {
    const res = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: 'wrong', type: 'exit' }),
    });
    assert.equal(res.status, 401);
  });

  it('POST /events validates event structure', async () => {
    const res = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, type: 'generate' }), // missing required fields
    });
    assert.equal(res.status, 400);
    const data = await res.json();
    assert.ok(data.error.includes('generate'));
  });

  // Regression: ids reach `execFileSync` argv and DOM attribute selectors.
  // Anything outside the strict generator pattern must be rejected before it
  // can leak into a downstream child_process or selector.
  it('POST /events rejects accept with shell metacharacters in id', async () => {
    const res = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'accept',
        id: '"; rm -rf /; #',
        variantId: '0',
      }),
    });
    assert.equal(res.status, 400);
    const data = await res.json();
    assert.ok(data.error.includes('id'));
  });

  it('POST /events rejects accept with non-numeric variantId', async () => {
    const res = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'accept',
        id: 'a1b2c3d4',
        variantId: '0; touch /tmp/owned',
      }),
    });
    assert.equal(res.status, 400);
    const data = await res.json();
    assert.ok(data.error.includes('variantId'));
  });

  it('POST /events rejects discard with malformed id', async () => {
    const res = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, type: 'discard', id: 'not a uuid' }),
    });
    assert.equal(res.status, 400);
    const data = await res.json();
    assert.ok(data.error.includes('id'));
  });

  it('POST /events accepts valid exit event', async () => {
    const res = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, type: 'exit' }),
    });
    assert.equal(res.status, 200);
    const data = await res.json();
    assert.equal(data.ok, true);
  });

  it('events flow from browser POST to agent poll', async () => {
    // Drain any queued events from previous tests
    await drainPolls(server);

    // Start a poll (will block until event arrives or timeout)
    const pollPromise = fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=5000`)
      .then(r => r.json());

    // Give the poll a moment to register
    await new Promise(r => setTimeout(r, 100));

    // Send a generate event (simulating browser)
    const postRes = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'generate',
        id: 'a1b2c3d4',
        action: 'bolder',
        count: 2,
        element: { outerHTML: '<div>test</div>', tagName: 'div' },
      }),
    });
    assert.equal(postRes.status, 200);

    // Poll should resolve with the event
    const event = await pollPromise;
    assert.equal(event.type, 'generate');
    assert.equal(event.id, 'a1b2c3d4');
    assert.equal(event.action, 'bolder');
    assert.equal(event.count, 2);

    await fetch(`http://localhost:${server.port}/poll`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, id: 'test-e2e-1', type: 'done' }),
    });
  });

  it('persists browser events to the durable session journal before poll delivery', async () => {
    await drainPolls(server);
    const journalPath = join(getLiveSessionsDir(REPO_ROOT), 'a1b2c3d6.jsonl');
    rmSync(journalPath, { force: true });

    const postRes = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'generate',
        id: 'a1b2c3d6',
        action: 'layout',
        count: 3,
        pageUrl: 'http://localhost:4321/',
        element: { outerHTML: '<section>persist</section>', tagName: 'section' },
      }),
    });
    assert.equal(postRes.status, 200);

    assert.equal(
      existsSync(journalPath),
      true,
      'event=live_server.journal_before_poll actor=browser operation=post_generate risk=server_restart_loses_unpolled_event expected=journal exists before agent poll actual=missing suggestion=append to live-session-store before enqueueing event',
    );
    const journal = readFileSync(journalPath, 'utf-8');
    assert.match(journal, /"type":"generate"/);

    await fetch(`http://localhost:${server.port}/poll`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, id: 'a1b2c3d6', type: 'done' }),
    });
  });

  it('accepts checkpoint events without exposing them as agent poll work', async () => {
    await drainPolls(server);
    const res = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'checkpoint',
        id: 'a1b2c3d7',
        phase: 'cycling',
        revision: 2,
        owner: 'browser-a',
        arrivedVariants: 3,
        visibleVariant: 2,
        paramValues: { density: 'packed' },
      }),
    });
    assert.equal(res.status, 200);

    const polled = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=50`).then(r => r.json());
    assert.equal(
      polled.type,
      'timeout',
      'event=live_server.checkpoint_not_polled actor=browser operation=checkpoint risk=checkpoint_starves_agent_queue expected=timeout actual=' + polled.type + ' suggestion=journal checkpoint without enqueueing agent work',
    );

    const snapshot = JSON.parse(readFileSync(join(getLiveSessionsDir(REPO_ROOT), 'a1b2c3d7.snapshot.json'), 'utf-8'));
    assert.equal(snapshot.visibleVariant, 2);
    assert.deepEqual(snapshot.paramValues, { density: 'packed' });
  });

  it('redelivers an unacknowledged browser event after helper server restart', async () => {
    const tmp = mkdtempSync(join(tmpdir(), 'impeccable-server-restart-'));
    let firstServer;
    let restarted;
    try {
      firstServer = await startServer(8519, { cwd: tmp });
      const postRes = await fetch(`http://localhost:${firstServer.port}/events`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          token: firstServer.token,
          type: 'generate',
          id: 'a1b2c3d8',
          action: 'polish',
          count: 2,
          pageUrl: 'http://localhost:4321/',
          element: { outerHTML: '<section>restart</section>', tagName: 'section' },
        }),
      });
      assert.equal(postRes.status, 200);

      await stopServer(firstServer.port, firstServer.token);
      firstServer.proc.kill();
      firstServer = null;

      restarted = await startServer(8519, { cwd: tmp });
      const replayed = await fetch(`http://localhost:${restarted.port}/poll?token=${restarted.token}&timeout=250&leaseMs=50`).then(r => r.json());

      assert.equal(
        replayed.id,
        'a1b2c3d8',
        'event=live_server.restart_replay actor=agent operation=poll_after_helper_restart risk=server_restart_loses_unpolled_event expected=a1b2c3d8 actual=' + replayed.id + ' suggestion=rebuild pending poll queue from live-session-store active snapshots on startup',
      );
      assert.equal(replayed.type, 'generate');
    } finally {
      if (firstServer) {
        await stopServer(firstServer.port, firstServer.token);
        firstServer.proc.kill();
      }
      if (restarted) {
        await stopServer(restarted.port, restarted.token);
        restarted.proc.kill();
      }
      rmSync(tmp, { recursive: true, force: true });
    }
  });

  it('records explicit completion acknowledgements as completed durable sessions', async () => {
    await drainPolls(server);
    await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'generate',
        id: 'a1b2c3d9',
        action: 'impeccable',
        count: 1,
        pageUrl: '/',
        element: { outerHTML: '<button>Done</button>' },
      }),
    });
    const polled = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=50`).then(r => r.json());
    assert.equal(polled.id, 'a1b2c3d9');
    const ack = await fetch(`http://localhost:${server.port}/poll`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, id: 'a1b2c3d9', type: 'complete' }),
    });
    assert.equal(ack.status, 200);
    const snapshot = JSON.parse(readFileSync(join(getLiveSessionsDir(REPO_ROOT), 'a1b2c3d9.snapshot.json'), 'utf-8'));
    assert.equal(snapshot.phase, 'completed');
  });

  it('manual live-complete acknowledges the running helper queue before writing fallback journal state', async () => {
    await drainPolls(server);
    await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'generate',
        id: 'a1b2c3dc',
        action: 'impeccable',
        count: 1,
        pageUrl: '/',
        element: { outerHTML: '<button>Manual</button>' },
      }),
    });
    const polled = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=50&leaseMs=50`).then(r => r.json());
    assert.equal(polled.id, 'a1b2c3dc');

    const completed = JSON.parse(execFileSync(process.execPath, [COMPLETE_SCRIPT, '--id', 'a1b2c3dc'], { cwd: REPO_ROOT, encoding: 'utf-8' }));
    assert.equal(completed.phase, 'completed');

    await new Promise(r => setTimeout(r, 75));
    const stale = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=50&leaseMs=50`).then(r => r.json());
    assert.equal(
      stale.type,
      'timeout',
      'event=live_complete.running_server_ack actor=agent operation=manual_complete risk=completed_session_redelivered_from_memory expected=timeout actual=' + stale.id,
    );
  });

  it('does not drop polled events until the agent acknowledges them', async () => {
    await drainPolls(server);

    const postRes = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'generate',
        id: 'a1b2c3da',
        action: 'polish',
        count: 2,
        element: { outerHTML: '<section>lease</section>', tagName: 'section' },
      }),
    });
    assert.equal(postRes.status, 200);

    const first = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=100&leaseMs=50`).then(r => r.json());
    assert.equal(first.id, 'a1b2c3da');

    const leased = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=25&leaseMs=50`).then(r => r.json());
    assert.equal(leased.type, 'timeout', 'leased event should not be redelivered before lease expiry');

    await new Promise(r => setTimeout(r, 75));
    const redelivered = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=100&leaseMs=50`).then(r => r.json());
    assert.equal(
      redelivered.id,
      'a1b2c3da',
      'event=live_poll.lease_redelivery actor=agent operation=poll_after_missed_ack risk=agent_missed_event_loses_live_state expected=same event redelivered after lease expiry actual=' + redelivered.id + ' suggestion=inspect pending event lease bookkeeping',
    );

    await fetch(`http://localhost:${server.port}/poll`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, id: 'a1b2c3da', type: 'done' }),
    });
    const acked = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=50&leaseMs=50`).then(r => r.json());
    assert.equal(acked.type, 'timeout', 'acked event should be removed from the poll queue');
  });

  it('wakes a parked poll as soon as a missed-ack lease expires', async () => {
    await drainPolls(server);

    const postRes = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token,
        type: 'generate',
        id: 'a1b2c3db',
        action: 'polish',
        count: 1,
        element: { outerHTML: '<section>wakeup</section>', tagName: 'section' },
      }),
    });
    assert.equal(postRes.status, 200);

    const first = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=100&leaseMs=60`).then(r => r.json());
    assert.equal(first.id, 'a1b2c3db');

    const startedAt = Date.now();
    const redelivered = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=500&leaseMs=60`).then(r => r.json());
    const elapsed = Date.now() - startedAt;

    assert.equal(
      redelivered.id,
      'a1b2c3db',
      'event=live_poll.lease_expiry_wakeup actor=agent operation=poll_before_lease_expiry risk=parked_poll_waits_full_timeout expected=a1b2c3db actual=' + redelivered.id,
    );
    assert.ok(
      elapsed < 250,
      'event=live_poll.lease_expiry_latency actor=agent operation=poll_before_lease_expiry risk=redelivery_waits_full_timeout expected=<250 actual=' + elapsed,
    );

    await fetch(`http://localhost:${server.port}/poll`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, id: 'a1b2c3db', type: 'done' }),
    });
  });

  it('agent reply is forwarded via SSE to browser', async () => {
    // Use raw HTTP to read SSE (no EventSource in Node.js)
    const controller = new AbortController();
    const sseRes = await fetch(
      `http://localhost:${server.port}/events?token=${server.token}`,
      { signal: controller.signal }
    );
    assert.equal(sseRes.status, 200);
    assert.equal(sseRes.headers.get('content-type'), 'text/event-stream');

    // Read the first message (should be "connected")
    const reader = sseRes.body.getReader();
    const decoder = new TextDecoder();
    const { value: chunk1 } = await reader.read();
    const text1 = decoder.decode(chunk1);
    assert.ok(text1.includes('"connected"'));

    // Send a reply from the agent
    await fetch(`http://localhost:${server.port}/poll`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token: server.token, id: 'sse-test', type: 'done', file: 'x.html' }),
    });

    // Read the next SSE message
    const { value: chunk2 } = await reader.read();
    const text2 = decoder.decode(chunk2);
    assert.ok(text2.includes('"done"'));
    assert.ok(text2.includes('sse-test'));

    controller.abort();
  });

  it('/source reads project files with valid token', async () => {
    const res = await fetch(`http://localhost:${server.port}/source?token=${server.token}&path=package.json`);
    assert.equal(res.status, 200);
    const text = await res.text();
    assert.ok(text.includes('"impeccable"'));
  });

  it('/source rejects path traversal', async () => {
    const res = await fetch(`http://localhost:${server.port}/source?token=${server.token}&path=../../../etc/passwd`);
    assert.equal(res.status, 400);
  });

  it('/source rejects invalid token', async () => {
    const res = await fetch(`http://localhost:${server.port}/source?token=wrong&path=package.json`);
    assert.equal(res.status, 401);
  });

  it('/source returns 404 for missing files', async () => {
    try {
      const res = await fetch(`http://localhost:${server.port}/source?token=${server.token}&path=nonexistent.xyz`);
      assert.equal(res.status, 404);
    } catch {
      // Server may close socket on 404 for some Node versions
      assert.ok(true, 'Server rejected request for missing file');
    }
  });

  it('/modern-screenshot.js serves the vendored UMD build', async () => {
    const res = await fetch(`http://localhost:${server.port}/modern-screenshot.js`);
    assert.equal(res.status, 200);
    assert.equal(res.headers.get('content-type'), 'application/javascript');
    const text = await res.text();
    // Sanity: the UMD build self-registers as window.modernScreenshot.
    assert.ok(text.includes('modernScreenshot'));
  });

  it('POST /annotation rejects invalid token', async () => {
    const res = await fetch(`http://localhost:${server.port}/annotation?token=wrong&eventId=abc`, {
      method: 'POST', headers: { 'Content-Type': 'image/png' }, body: new Uint8Array([0x89, 0x50, 0x4e, 0x47]),
    });
    assert.equal(res.status, 401);
  });

  it('POST /annotation rejects invalid eventId', async () => {
    const res = await fetch(`http://localhost:${server.port}/annotation?token=${server.token}&eventId=has%20spaces`, {
      method: 'POST', headers: { 'Content-Type': 'image/png' }, body: new Uint8Array([0x89]),
    });
    assert.equal(res.status, 400);
  });

  it('POST /annotation rejects non-PNG content-type', async () => {
    const res = await fetch(`http://localhost:${server.port}/annotation?token=${server.token}&eventId=abc`, {
      method: 'POST', headers: { 'Content-Type': 'application/octet-stream' }, body: new Uint8Array([0x89]),
    });
    assert.equal(res.status, 415);
  });

  it('POST /annotation writes PNG to session dir and returns path', async () => {
    const eventId = 'test-' + Math.random().toString(36).slice(2, 10);
    // Minimal valid PNG header + IEND chunk (enough to prove we wrote bytes)
    const png = new Uint8Array([
      0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
      0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82,
    ]);
    const res = await fetch(`http://localhost:${server.port}/annotation?token=${server.token}&eventId=${eventId}`, {
      method: 'POST', headers: { 'Content-Type': 'image/png' }, body: png,
    });
    assert.equal(res.status, 200);
    const data = await res.json();
    assert.equal(data.ok, true);
    assert.ok(data.path.endsWith(eventId + '.png'));
    const written = readFileSync(data.path);
    assert.equal(written.length, png.length);
  });

  it('POST /events accepts generate with optional annotation fields', async () => {
    // Drain any queued events from previous tests
    let drained;
    do {
      const r = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=100`);
      drained = await r.json();
    } while (drained.type !== 'timeout');

    const postRes = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token, type: 'generate',
        id: 'aa11bb22', action: 'polish', count: 2,
        element: { outerHTML: '<div>x</div>', tagName: 'div' },
        screenshotPath: '/tmp/fake.png',
        comments: [{ x: 10, y: 20, text: 'tighten this' }],
        strokes: [{ points: [[0, 0], [10, 10]] }],
      }),
    });
    assert.equal(postRes.status, 200);

    const pollRes = await fetch(`http://localhost:${server.port}/poll?token=${server.token}&timeout=2000`);
    const event = await pollRes.json();
    assert.equal(event.id, 'aa11bb22');
    assert.equal(event.screenshotPath, '/tmp/fake.png');
    assert.equal(event.comments.length, 1);
    assert.equal(event.strokes.length, 1);
  });

  it('POST /events rejects generate with malformed annotation fields', async () => {
    const postRes = await fetch(`http://localhost:${server.port}/events`, {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        token: server.token, type: 'generate',
        id: 'cc33dd44', action: 'polish', count: 2,
        element: { outerHTML: '<div>x</div>', tagName: 'div' },
        comments: 'not-an-array',
      }),
    });
    assert.equal(postRes.status, 400);
    const data = await postRes.json();
    assert.ok(data.error.includes('comments'));
  });
});