// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright (C) 2026 Bryan Joshua Pedini

/**
 * PLAN §12 core item 12 and the Docker-socket matrix: empty / one / large container sets
 * (FakeDocker), inaccessible / missing / failing / hanging Engine → 500 with a generic body and no
 * internal details, recovery once the Engine recovers, and running-only (`docker ps`) semantics.
 */
import {
  test,
  expect,
  assertDbInvariants,
  expectContainersResponse,
  expectErrorResponse,
  expectNoInternalDetails,
  makeContainerSummary,
  pollUntil,
  readOperations,
  type ContainerSummary,
} from '../../harness';

test('no running containers → 200 with exactly []', async ({ cli, startServer, http }) => {
  const tok = await cli.tokenNew();
  const server = await startServer();
  server.fakeDocker!.empty();
  const pw = await http.get(server.url(), { token: tok });
  expect(expectContainersResponse(pw)).toEqual([]);
  expect(pw.body).toBe('[]');
  expect(pw.headers['content-length']).toBe('2');
  const c = await http.curl({ url: server.url(), token: tok });
  expect(c.body).toBe('[]');
  expect((await server.stop()).exitCode).toBe(0);
  expect(readOperations(server.dbPath)).toHaveLength(2);
});

test('the Engine is asked for running containers only (GET /containers/json without all)', async ({ cli, startServer, http }) => {
  const tok = await cli.tokenNew();
  const server = await startServer();
  expectContainersResponse(await http.get(server.url('/api/v1/containers?all=true'), { token: tok }));
  expect((await server.stop()).exitCode).toBe(0);
  const lists = server.fakeDocker!.requests.filter((r) => r.path === '/containers/json');
  expect(lists).toHaveLength(1);
  expect(lists[0].method).toBe('GET');
  expect(new URLSearchParams(lists[0].query).get('all') ?? '0').toMatch(/^(0|false)$/);
  expect(server.fakeDocker!.stats.other, 'no other Engine endpoints are called').toBe(0);
});

test('one container: Engine summary fields are passed through', async ({ cli, startServer, http }) => {
  const tok = await cli.tokenNew();
  const server = await startServer();
  const c: ContainerSummary = makeContainerSummary(0, undefined, {
    Names: ['/web-1'],
    Image: 'nginx:1.29',
    Command: 'nginx -g "daemon off;"',
    Labels: { 'com.example.role': 'web', 'unicode.label': 'naïve ☃' },
    Ports: [{ IP: '127.0.0.1', PrivatePort: 80, PublicPort: 8080, Type: 'tcp' }],
    Status: 'Up 5 minutes',
  });
  server.fakeDocker!.setContainers([c]);
  const [got] = expectContainersResponse(await http.get(server.url(), { token: tok }));
  expect(got).toMatchObject({ Id: c.Id, Names: c.Names, Image: c.Image, ImageID: c.ImageID, Command: c.Command, Created: c.Created, Labels: c.Labels, State: 'running', Status: c.Status });
  expect(got.Ports).toEqual([{ IP: '127.0.0.1', PrivatePort: 80, PublicPort: 8080, Type: 'tcp' }]);
  expect((await server.stop()).exitCode).toBe(0);
});

test('large container set: 2000 summaries, complete and in order (Playwright and curl)', async ({ cli, startServer, http }) => {
  const tok = await cli.tokenNew();
  const server = await startServer();
  server.fakeDocker!.many(2000);
  const ids = server.fakeDocker!.containers.map((c) => c.Id);
  const pw = expectContainersResponse<ContainerSummary>(await http.get(server.url(), { token: tok }));
  expect(pw.map((c) => c.Id)).toEqual(ids);
  expect(pw.every((c) => c.State === 'running')).toBe(true);
  const cu = await http.curl({ url: server.url(), token: tok });
  expect(expectContainersResponse<ContainerSummary>(cu).map((c) => c.Names[0])).toEqual(ids.map((_, i) => `/fake-${i}`));
  expect(cu.bodyBuffer.length).toBeGreaterThan(500_000);
  expect((await server.stop()).exitCode).toBe(0);
  expect(readOperations(server.dbPath)).toHaveLength(2);
});

test('Engine failures → 500 with the generic body only; details stay in the ERROR log', async ({ cli, startServer, http }) => {
  const tok = await cli.tokenNew();
  const server = await startServer({ logLevel: 'INFO' });
  const f = server.fakeDocker!;
  const modes: Array<[string, () => void]> = [
    ['500 with internal message', () => f.error500('boom: /var/lib/docker/overlay2 sqlite secret path')],
    ['404 (API mismatch)', () => f.error(404, 'page not found')],
    ['503', () => f.error(503, 'engine starting')],
    ['connection dropped mid-request', () => f.destroy()],
    ['malformed JSON', () => f.badJson('{"not":"an array"')],
    ['JSON of the wrong shape', () => f.badJson('{"Id":"x"}')],
    ['HTML instead of JSON', () => f.badJson('<html>proxy error</html>')],
  ];
  for (const [name, apply] of modes) {
    await test.step(name, async () => {
      apply();
      const r = await http.get(server.url(), { token: tok });
      expectErrorResponse(r, 500);
      expectNoInternalDetails(r.body);
      expect(Object.keys(r.headers).filter((h) => /^(api-version|docker|ostype|server)/i.test(h)), 'no Engine headers forwarded').toEqual([]);
    });
  }
  f.many(3);
  expect(expectContainersResponse(await http.get(server.url(), { token: tok }))).toHaveLength(3);
  expect((await server.stop()).exitCode).toBe(0);
  const errors = server.logs().filter({ level: 'ERROR' });
  expect(errors.map((e) => e.msg)).toEqual(modes.map(() => 'docker request failed'));
  expect(errors[0].attrs.error).toContain('boom');
  expect(server.logs().requests().map((r) => r.attrs.status)).toEqual([...modes.map(() => '500'), '200']);
  expect(readOperations(server.dbPath)).toHaveLength(modes.length + 1);
  assertDbInvariants(server.dbPath);
});

test('socket inaccessible (EACCES) and missing (ENOENT): server starts, requests → 500, no details', async ({ cli, startServer, http }) => {
  const tok = await cli.tokenNew();
  for (const docker of ['inaccessible', 'missing'] as const) {
    await test.step(docker, async () => {
      const server = await startServer({ docker });
      const r = await http.get(server.url(), { token: tok });
      expectErrorResponse(r, 500);
      expectNoInternalDetails(r.body);
      const c = await http.curl({ url: server.url(), token: tok });
      expectErrorResponse(c, 500);
      expectErrorResponse(await http.get(server.url()), 401);
      expect((await server.stop()).exitCode).toBe(0);
      const err = server.logs().filter({ level: 'ERROR', msg: 'docker request failed' });
      expect(err).toHaveLength(2);
      expect(err[0].attrs.error).toMatch(docker === 'inaccessible' ? /permission denied/ : /no such file or directory/);
    });
  }
});

test('temporarily failing Engine: errors while failing, recovery afterwards', async ({ cli, startServer, http }) => {
  const tok = await cli.tokenNew();
  const server = await startServer();
  const f = server.fakeDocker!.many(2).flaky(3);
  const statuses: number[] = [];
  for (let i = 0; i < 5; i++) statuses.push((await http.get(server.url(), { token: tok })).status);
  expect(statuses).toEqual([500, 500, 500, 200, 200]);
  // full outage then recovery
  f.destroy();
  expectErrorResponse(await http.get(server.url(), { token: tok }), 500);
  f.many(1);
  expect(expectContainersResponse(await http.get(server.url(), { token: tok }))).toHaveLength(1);
  expect((await server.stop()).exitCode).toBe(0);
  expect(readOperations(server.dbPath)).toHaveLength(7);
});

test('hung Engine: request bounded by the 10 s Docker timeout, server stays responsive, graceful shutdown waits for it', async ({ cli, startServer, http }) => {
  test.setTimeout(90_000);
  const tok = await cli.tokenNew();
  const server = await startServer({ logLevel: 'DEBUG' });
  const f = server.fakeDocker!.hang();
  const t0 = performance.now();
  const hung = http.get(server.url(), { token: tok, timeoutMs: 30_000 });
  await pollUntil('the hung list call to reach the fake', () => (f.listCalls() >= 1 ? true : undefined));
  // other requests are served meanwhile
  const quick = await http.get(server.url('/elsewhere'));
  expectErrorResponse(quick, 404);
  expect(quick.durationMs).toBeLessThan(2000);
  const r = await hung;
  const elapsed = performance.now() - t0;
  expectErrorResponse(r, 500);
  expect(elapsed, 'bounded by the 10 s Engine timeout').toBeGreaterThan(9_500);
  expect(elapsed).toBeLessThan(15_000);
  expect(server.logs().find({ level: 'ERROR', msg: 'docker request failed' })!.attrs.error).toMatch(/context deadline exceeded|timeout/i);

  // second hung request in flight while SIGTERM arrives: shutdown drains it and exits 0
  const hung2 = http.get(server.url(), { token: tok, timeoutMs: 30_000 });
  await pollUntil('second hung call', () => (f.listCalls() >= 2 ? true : undefined));
  const stopping = server.stop('SIGTERM', { timeoutMs: 25_000 });
  expectErrorResponse(await hung2, 500);
  const exit = await stopping;
  expect(exit.exitCode).toBe(0);
  expect(server.logs().has({ msg: 'server stopped' })).toBe(true);
  expect(readOperations(server.dbPath)).toHaveLength(2);
});