// Security self-check for the API. Boots the real server against a throwaway
// DATA_DIR and exercises the boundaries that matter: who may write, what may be
// written, who may read a photo back, and who may moderate the strip.
//
//   npm test            (from docker/backend/)
//
// Node only — no test framework, no network beyond loopback.
import { spawn } from 'node:child_process';
import { existsSync, mkdtempSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..');
const PORT = Number(process.env.TEST_PORT || 3411);
const BASE = `http://127.0.0.1:${PORT}/api`;
const ADMIN_EMAIL = 'admin@test.local';
const DATA_DIR = mkdtempSync(join(tmpdir(), 'recipescam-sec-'));

// A 1x1 PNG, and the first bytes of a JPEG (all the sniffer looks at).
const PNG = Buffer.from(
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==',
  'base64',
);
const JPEG_HEAD = Buffer.concat([Buffer.from([0xff, 0xd8, 0xff, 0xe0]), Buffer.alloc(64)]);

let pass = 0;
let fail = 0;
const check = (name, ok, detail = '') => {
  if (ok) {
    pass++;
    console.log(`PASS ${name}`);
  } else {
    fail++;
    console.log(`FAIL ${name}${detail ? ` :: ${detail}` : ''}`);
  }
};

// One cookie jar per actor, so "signed in as A" cannot leak into B.
function actor() {
  let cookie = '';
  return {
    get cookie() {
      return cookie;
    },
    async req(path, init = {}) {
      const headers = { ...(init.headers ?? {}) };
      if (cookie) headers.cookie = cookie;
      const res = await fetch(BASE + path, { ...init, headers });
      const set = res.headers.getSetCookie?.() ?? (res.headers.get('set-cookie') ? [res.headers.get('set-cookie')] : []);
      for (const line of set) {
        const value = line.split(';')[0];
        if (value.startsWith('rc_session=')) cookie = value.endsWith('=') ? '' : value;
      }
      const text = await res.text();
      let body = null;
      try {
        body = text ? JSON.parse(text) : null;
      } catch {
        body = text;
      }
      return { status: res.status, headers: res.headers, setCookie: set.join(' | '), body };
    },
    signup(email, password = 'supersecret1') {
      return this.req('/auth/signup', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ email, password }),
      });
    },
    upload(bytes, type) {
      return this.req('/photos', { method: 'POST', headers: { 'content-type': type }, body: bytes });
    },
  };
}

// Run the sources, not a possibly stale build: the point of this suite is to
// test the code as written.
const tsx = join(ROOT, 'node_modules/.bin/tsx');
const entry = existsSync(tsx) ? [tsx, 'src/server.ts'] : ['dist/server.js'];
const server = spawn(process.execPath, entry, {
  cwd: ROOT,
  env: { ...process.env, PORT: String(PORT), DATA_DIR, ADMIN_EMAILS: ADMIN_EMAIL, NODE_ENV: 'test' },
  stdio: ['ignore', 'pipe', 'pipe'],
});
let serverLog = '';
server.stdout.on('data', (d) => (serverLog += d));
server.stderr.on('data', (d) => (serverLog += d));

async function waitForServer() {
  for (let i = 0; i < 100; i++) {
    try {
      const res = await fetch(`${BASE}/health`);
      if (res.ok) return true;
    } catch {
      /* not up yet */
    }
    await new Promise((r) => setTimeout(r, 100));
  }
  return false;
}

try {
  if (!(await waitForServer())) throw new Error(`server never came up:\n${serverLog}`);

  const stamp = Date.now();
  const admin = actor();
  const user = actor();
  const other = actor();

  // ---- accounts -----------------------------------------------------------
  check('health responds', (await fetch(`${BASE}/health`)).ok);

  const badEmail = await user.signup('not-an-email');
  check('signup rejects a malformed email', badEmail.status === 400, `got ${badEmail.status}`);
  const badPw = await user.signup(`short${stamp}@test.local`, 'short');
  check('signup rejects a short password', badPw.status === 400, `got ${badPw.status}`);

  const adminSignup = await admin.signup(ADMIN_EMAIL);
  check('admin account signs up', adminSignup.status === 201, `got ${adminSignup.status}`);
  const userSignup = await user.signup(`contributor${stamp}@test.local`);
  check('contributor account signs up', userSignup.status === 201, `got ${userSignup.status}`);
  await other.signup(`other${stamp}@test.local`);

  const cookie = userSignup.setCookie;
  check('session cookie is HttpOnly', /HttpOnly/i.test(cookie), cookie);
  check('session cookie is SameSite', /SameSite=Lax/i.test(cookie), cookie);
  check('session cookie is not Secure over plain http', !/;\s*Secure/i.test(cookie), cookie);
  check('session token is 256 bits of hex', /rc_session=[0-9a-f]{64}/.test(cookie), cookie);

  // The proxy hands nginx the public scheme; a TLS visitor must get Secure.
  const tls = actor();
  const tlsSignup = await tls.req('/auth/signup', {
    method: 'POST',
    headers: { 'content-type': 'application/json', 'x-forwarded-proto': 'https' },
    body: JSON.stringify({ email: `tls${stamp}@test.local`, password: 'supersecret1' }),
  });
  check('session cookie is Secure behind https', /;\s*Secure/i.test(tlsSignup.setCookie), tlsSignup.setCookie);

  // Documented, not fixed: the 409 is a deliberate UX choice and doubles as an
  // account-existence oracle.
  const dup = await actor().signup(ADMIN_EMAIL);
  check('duplicate signup is a 409 (known user-enumeration oracle)', dup.status === 409, `got ${dup.status}`);

  const noUser = await actor().req('/auth/login', {
    method: 'POST',
    headers: { 'content-type': 'application/json' },
    body: JSON.stringify({ email: `ghost${stamp}@test.local`, password: 'supersecret1' }),
  });
  check('unknown email and wrong password look identical', noUser.status === 401, `got ${noUser.status}`);

  const anonMe = await actor().req('/auth/me');
  check('signed out is a 200 with no user', anonMe.status === 200 && anonMe.body?.user === null, JSON.stringify(anonMe.body));
  const ownMe = await user.req('/auth/me');
  check('/auth/me reports the signed-in account', ownMe.body?.user?.email === `contributor${stamp}@test.local`, JSON.stringify(ownMe.body));

  // ---- rate limiting ------------------------------------------------------
  const brute = actor();
  const bruteEmail = `brute${stamp}@test.local`;
  let limited = 0;
  for (let i = 0; i < 21; i++) {
    const res = await brute.req('/auth/login', {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({ email: bruteEmail, password: 'wrong-password' }),
    });
    if (res.status === 429) limited++;
  }
  check('login attempts are rate limited', limited === 1, `429s: ${limited}`);

  // ---- upload boundary ----------------------------------------------------
  check('guest cannot upload', (await actor().upload(PNG, 'image/png')).status === 401);
  check(
    'non-image content-type is refused',
    (await user.upload(Buffer.from('<svg xmlns="http://www.w3.org/2000/svg"/>'), 'image/svg+xml')).status === 415,
  );
  check(
    'svg bytes under an image content-type is refused',
    (await user.upload(Buffer.from('<svg onload="alert(1)"/>'), 'image/jpeg')).status === 415,
  );
  check(
    'a declared type that disagrees with the bytes is refused',
    (await user.upload(JPEG_HEAD, 'image/png')).status === 415,
  );
  check('empty body is refused', (await user.upload(Buffer.alloc(0), 'image/png')).status === 400);

  const tooBig = Buffer.concat([PNG, Buffer.alloc(4 * 1024 * 1024)]);
  check('an over-limit body is refused', (await user.upload(tooBig, 'image/png')).status === 413);

  const created = await user.upload(PNG, 'image/png');
  check('a signed-in member can upload a real PNG', created.status === 201, JSON.stringify(created.body));

  // ---- what the public may read ------------------------------------------
  const list = await actor().req('/photos');
  const listed = list.body?.photos ?? [];
  check('the strip is readable anonymously', list.status === 200);
  check(
    'the public strip leaks no owner',
    listed.length > 0 && !('userId' in listed[0]) && !('email' in listed[0]) && !('file' in listed[0]),
    JSON.stringify(listed[0]),
  );

  const id = created.body?.photo?.id;
  const served = await fetch(`${BASE}/photos/${id}/file`);
  check('a contributed photo is served', served.status === 200);
  check('the served photo keeps its sniffed type', served.headers.get('content-type') === 'image/png');
  check('the served photo is nosniff', served.headers.get('x-content-type-options') === 'nosniff');
  check('the served photo is sandboxed', (served.headers.get('content-security-policy') ?? '').includes('sandbox'));
  check('the bytes round-trip intact', Buffer.from(await served.arrayBuffer()).equals(PNG));

  check('an unknown id is a 404', (await fetch(`${BASE}/photos/999999/file`)).status === 404);
  check('a non-numeric id is a 404', (await fetch(`${BASE}/photos/abc/file`)).status === 404);
  check(
    'an id cannot escape the uploads directory',
    (await fetch(`${BASE}/photos/..%2f..%2fetc%2fpasswd/file`)).status === 404,
  );

  // ---- moderation ---------------------------------------------------------
  check('a guest cannot moderate', (await actor().req('/admin/photos')).status === 401);
  const forbidden = await user.req('/admin/photos');
  check('a plain member is 403, not 200', forbidden.status === 403, `got ${forbidden.status}`);

  const adminList = await admin.req('/admin/photos');
  const rows = adminList.body?.photos ?? [];
  check('an admin lists contributions', adminList.status === 200 && rows.length > 0);
  check('the admin listing carries the owner', rows.some((r) => /@test\.local$/.test(r.email ?? '')));
  check('a plain member cannot delete', (await user.req(`/admin/photos/${id}`, { method: 'DELETE' })).status === 403);

  const deleted = await admin.req(`/admin/photos/${id}`, { method: 'DELETE' });
  check('an admin deletes a contribution', deleted.status === 204, `got ${deleted.status}`);
  check('the deleted file is gone from disk', (await fetch(`${BASE}/photos/${id}/file`)).status === 404);
  check('the deleted row is gone from the listing', !((await admin.req('/admin/photos')).body?.photos ?? []).some((r) => r.id === id));

  // ---- quota --------------------------------------------------------------
  const quota = actor();
  await quota.signup(`quota${stamp}@test.local`);
  let last = 0;
  for (let i = 0; i < 13; i++) last = (await quota.upload(PNG, 'image/png')).status;
  check('uploads are capped per account', last === 429, `13th upload: ${last}`);

  const cleared = await admin.req('/admin/photos', { method: 'DELETE' });
  check('an admin clears the strip in one call', cleared.status === 200 && cleared.body?.removed > 0, JSON.stringify(cleared.body));
  check('the strip is empty afterwards', ((await actor().req('/photos')).body?.photos ?? []).length === 0);

  // ---- pre-existing guarantees still hold ---------------------------------
  const foreignRecipe = await user.req('/recipes/1', { method: 'DELETE' });
  check("another account's recipe is not deletable", foreignRecipe.status === 404, `got ${foreignRecipe.status}`);
  const missing = await actor().req('/nope');
  check('unknown routes keep the single error shape', missing.status === 404 && missing.body?.error === 'not_found');
} catch (err) {
  fail++;
  console.log(`FAIL harness :: ${err && err.stack ? err.stack : err}`);
  console.log(serverLog.slice(-2000));
} finally {
  server.kill('SIGTERM');
  rmSync(DATA_DIR, { recursive: true, force: true });
}

console.log(`\n${pass} passed, ${fail} failed`);
process.exit(fail === 0 ? 0 : 1);