import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";

const poolConstructor = vi.hoisted(() => vi.fn());
const betterAuthMock = vi.hoisted(() => vi.fn());
const drizzleAdapterMock = vi.hoisted(() => vi.fn());
const serveMock = vi.hoisted(() => vi.fn());
const processOnSpy = vi.hoisted(() => vi.fn());

vi.mock("pg", () => ({ Pool: poolConstructor }));
vi.mock("better-auth", () => ({ betterAuth: betterAuthMock }));
vi.mock("better-auth/adapters/drizzle", () => ({ drizzleAdapter: drizzleAdapterMock }));
vi.mock("@hono/node-server", () => ({ serve: serveMock }));
// Wraps the real `createApiApp` in a spy rather than replacing it, so every existing test still
// gets the real Hono application; only the one test that deliberately forces an app-construction
// failure overrides this with `mockImplementationOnce`.
vi.mock("../src/app.js", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../src/app.js")>();
  return { ...actual, createApiApp: vi.fn(actual.createApiApp) };
});

import { parseModuleManifest } from "@ekklesia/contracts";
import {
  type DiscoveredModule,
  ModuleDiscoveryError,
  ModulePermissionCompositionError,
} from "@ekklesia/core/modules";
import { PermissionRegistryError } from "@ekklesia/core/authorization";
import { createApiApp } from "../src/app.js";
import { createApiRuntimeConfig } from "../src/config.js";
import { installShutdownSignalHandlers, startApi } from "../src/server.js";

function validConfig() {
  return createApiRuntimeConfig(
    {
      databaseUrl: "postgresql://ekklesia:ekklesia@127.0.0.1:5432/ekklesia",
      host: "127.0.0.1",
      identity: {
        baseUrl: "https://identity.example.test",
        secret: "correct-horse-battery-staple-0123456789",
        trustedOrigins: ["https://identity.example.test"],
      },
      port: 0,
    },
    { environment: "production" },
  );
}

const temporaryDirectories: string[] = [];

async function createTemporaryModulesDirectory(): Promise<string> {
  const directory = await mkdtemp(path.join(tmpdir(), "ekklesia-api-modules-"));
  temporaryDirectories.push(directory);
  return directory;
}

/** Writes a minimal, structurally valid module fixture (package.json + ekklesia.module.json +
 * server entrypoint) directly to disk — real discovery, not a hand-built double. The server
 * entrypoint throws immediately if ever imported, so a test that reaches a successful assertion
 * without that throw firing is direct evidence permission composition never executed it. */
async function createFixtureModule(
  modulesDirectory: string,
  id: string,
  manifestOverrides: Record<string, unknown> = {},
): Promise<void> {
  const moduleDirectory = path.join(modulesDirectory, id);
  const manifest = {
    manifestVersion: 3,
    id,
    name: `${id} module`,
    version: "0.1.0",
    compatibility: { platform: "^0.1.0", moduleSdk: "^0.1.0" },
    permissions: [],
    entrypoints: { server: "./dist/server/index.js" },
    ...manifestOverrides,
  };
  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
  await Promise.all([
    writeFile(
      path.join(moduleDirectory, "package.json"),
      JSON.stringify({
        ekklesia: { layer: "module" },
        name: `@test/module-${id}`,
        type: "module",
        version: "0.1.0",
      }),
    ),
    writeFile(path.join(moduleDirectory, "ekklesia.module.json"), JSON.stringify(manifest)),
    writeFile(
      path.join(moduleDirectory, "dist/server/index.js"),
      'throw new Error("permission composition must never execute a module server entrypoint");',
    ),
  ]);
}

const eventSymbols: symbol[] = [];

/** Same technique as `core/tests/module-runtime.test.ts`: a dynamically imported module fixture
 * cannot close over this test file's local variables, so lifecycle events cross that boundary
 * through a `globalThis` symbol instead. Returns the same `events` array the fixture's generated
 * source pushes into, so test code can both read it directly and push its own markers (pool
 * close, server close) onto the identical array to observe cross-cutting shutdown order. */
function createEventRecorder(): { events: string[]; expression: string } {
  const key = `ekklesia.api.lifecycle.test.${eventSymbols.length}.${Date.now()}.${Math.random()}`;
  const symbol = Symbol.for(key);
  const events: string[] = [];
  (globalThis as unknown as Record<PropertyKey, unknown>)[symbol] = events;
  eventSymbols.push(symbol);
  return { events, expression: `globalThis[Symbol.for(${JSON.stringify(key)})]` };
}

/** Same globalThis-symbol technique as `createEventRecorder`, but captures an actual object
 * reference (such as `context.services.database`) rather than a string label, so a test can prove
 * two values pushed from different, independently dynamically-imported invocations (a module's own
 * `start` hook and one of its HTTP handlers) are the exact same object. */
function createReferenceRecorder(): { values: unknown[]; expression: string } {
  const key = `ekklesia.api.lifecycle.test.ref.${eventSymbols.length}.${Date.now()}.${Math.random()}`;
  const symbol = Symbol.for(key);
  const values: unknown[] = [];
  (globalThis as unknown as Record<PropertyKey, unknown>)[symbol] = values;
  eventSymbols.push(symbol);
  return { values, expression: `globalThis[Symbol.for(${JSON.stringify(key)})]` };
}

interface WorkingFixtureModuleOptions {
  /** Declares one `GET /ping` route against `<id>.ping.read` when true. */
  readonly withRoute?: boolean;
  readonly registerThrows?: boolean;
  readonly startThrows?: boolean;
  readonly stopThrows?: boolean;
  readonly dependencies?: Record<string, unknown>;
}

/** Writes a real, working module fixture — unlike `createFixtureModule`, this entrypoint does not
 * throw on import; it pushes lifecycle markers onto `recorder.events` and can be told to fail at a
 * specific hook, so tests can prove exactly what a successful (or a specifically-failing) module
 * runtime startup actually executes and in what order, relative to pool/server construction. */
async function createWorkingFixtureModule(
  modulesDirectory: string,
  id: string,
  recorder: { expression: string },
  options: WorkingFixtureModuleOptions = {},
): Promise<void> {
  const permissionId = `${id}.ping.read`;
  await createFixtureModule(modulesDirectory, id, {
    permissions: options.withRoute
      ? [{ baseline: "public", description: "Ping.", id: permissionId }]
      : [],
    ...(options.dependencies ? { dependencies: options.dependencies } : {}),
  });
  const routeSource = options.withRoute
    ? `http.route({
        method: "GET",
        path: "/ping",
        permission: ${JSON.stringify(permissionId)},
        maxBodyBytes: 0,
        handler: async () => new Response("pong", { status: 200 }),
      });`
    : "";
  const serverSource = `export default {
    id: ${JSON.stringify(id)},
    version: "0.1.0",
    register({ http }) {
      ${recorder.expression}.push(${JSON.stringify(`${id}:register`)});
      ${routeSource}
      ${options.registerThrows ? 'throw new Error("register failed");' : ""}
    },
    start() {
      ${recorder.expression}.push(${JSON.stringify(`${id}:start`)});
      ${options.startThrows ? 'throw new Error("start failed");' : ""}
    },
    stop() {
      ${recorder.expression}.push(${JSON.stringify(`${id}:stop`)});
      ${options.stopThrows ? 'throw new Error("stop failed");' : ""}
    },
  };`;
  await writeFile(path.join(modulesDirectory, id, "dist/server/index.js"), serverSource);
}

/** A minimal, in-memory `DiscoveredModule` double built from a real, validated manifest — used
 * only to reach `composePlatformPermissionRegistry`'s own duplicate-detection failure, which is
 * unreachable through real filesystem discovery (module ids are unique and every permission id is
 * namespaced by its own module's id, so no two genuinely discovered modules can ever collide). */
function fakeDiscoveredModule(
  id: string,
  permissions: ReadonlyArray<{
    id: string;
    baseline: "public" | "authenticated" | "restricted";
    description: string;
  }>,
): DiscoveredModule {
  const manifest = parseModuleManifest({
    capabilities: [],
    compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
    entrypoints: { server: "./dist/does-not-exist/index.js" },
    id,
    manifestVersion: 3,
    name: `${id} module`,
    permissions,
    version: "0.1.0",
  });
  return {
    directory: `/modules/${id}`,
    entrypoints: { server: `/modules/${id}/dist/does-not-exist/index.js` },
    manifest,
    manifestPath: `/modules/${id}/ekklesia.module.json`,
    packageName: `@test/${id}`,
  };
}

/** A minimal fake `ServerType`: enough of Node's `http.Server` shape for `bindServer`/`shutdown`
 * to drive without a real socket. `close` and `once` are spies so tests can assert call counts;
 * `triggerError` simulates the server's own `'error'` event (e.g. a bind failure). */
type ClientErrorHandler = (error: NodeJS.ErrnoException, socket: import("node:net").Socket) => void;

function fakeServer() {
  let errorHandler: ((error: Error) => void) | undefined;
  let clientErrorHandler: ClientErrorHandler | undefined;
  const server = {
    address: () => ({ address: "127.0.0.1", family: "IPv4", port: 4_000 }),
    close: vi.fn((callback?: () => void) => {
      callback?.();
      return server;
    }),
    listening: true,
    on: vi.fn((event: string, handler: ClientErrorHandler) => {
      if (event === "clientError") {
        clientErrorHandler = handler;
      }
      return server;
    }),
    once: vi.fn((event: string, handler: (error: Error) => void) => {
      if (event === "error") {
        errorHandler = handler;
      }
      return server;
    }),
  };
  return {
    /** The `clientError` handler `bindServer` registered — the real event path Node uses for a
     * header/request timeout, a parse failure, and a header overflow alike. */
    clientErrorHandler: () => clientErrorHandler,
    server,
    triggerError: (error: Error) => errorHandler?.(error),
  };
}

/** Resolves the listening callback asynchronously, matching real `@hono/node-server` behavior
 * (the callback fires on the `listening` event, after `serve()` itself has already returned) —
 * resolving synchronously would reference `bindServer`'s own `server` const before it is
 * initialized. */
function mockSuccessfulServe() {
  const { clientErrorHandler, server, triggerError } = fakeServer();
  serveMock.mockImplementation((_options: unknown, listeningListener?: () => void) => {
    queueMicrotask(() => listeningListener?.());
    return server;
  });
  return { clientErrorHandler, server, triggerError };
}

function mockFailingServe(error: Error) {
  const { server, triggerError } = fakeServer();
  serveMock.mockImplementation(() => {
    queueMicrotask(() => triggerError(error));
    return server;
  });
  return server;
}

/** Captures signal handlers registered via `process.on` without ever installing a real one, so a
 * test can trigger "SIGINT"/"SIGTERM" by calling the captured function directly. */
function mockProcessOn(): { handlers: Record<string, () => void>; restore: () => void } {
  const handlers: Record<string, () => void> = {};
  const fake = vi.fn((event: string, handler: () => void) => {
    handlers[event] = handler;
    return process;
  });
  const onSpy = vi.spyOn(process, "on").mockImplementation(fake as unknown as typeof process.on);
  return { handlers, restore: () => onSpy.mockRestore() };
}

describe("Ekklesia API import safety", () => {
  const originalEnv = { ...process.env };
  const originalProcessOn = process.on.bind(process);

  beforeEach(() => {
    poolConstructor.mockClear();
    betterAuthMock.mockClear();
    drizzleAdapterMock.mockClear();
    serveMock.mockClear();
    processOnSpy.mockClear();
    for (const key of Object.keys(process.env)) {
      if (!(key in originalEnv)) {
        delete process.env[key];
      }
    }
    process.env = { ...originalEnv };
    process.on = originalProcessOn;
  });

  it("does not construct a database pool, Better Auth, or an HTTP server merely by importing the app factory", async () => {
    await import("../src/app.js");

    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("does not construct a database pool, Better Auth, or an HTTP server merely by importing configuration", async () => {
    await import("../src/config.js");

    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("does not read environment variables, connect to PostgreSQL, construct Better Auth, start a server, or install signal handlers merely by importing the executable server module", async () => {
    // Deliberately leave every runtime-required environment variable unset. If importing this
    // module performed any runtime composition, missing configuration would throw here.
    delete process.env.DATABASE_URL;
    delete process.env.EKKLESIA_IDENTITY_SECRET;
    delete process.env.EKKLESIA_IDENTITY_BASE_URL;
    delete process.env.EKKLESIA_IDENTITY_TRUSTED_ORIGINS;
    const onSpy = vi.spyOn(process, "on").mockImplementation(processOnSpy);

    await expect(import("../src/server.js")).resolves.toBeDefined();

    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(drizzleAdapterMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
    expect(processOnSpy).not.toHaveBeenCalled();
    onSpy.mockRestore();
  });

  it("exposes startApi and main as explicit functions without invoking them at import time", async () => {
    const module = await import("../src/server.js");

    expect(typeof module.startApi).toBe("function");
    expect(typeof module.main).toBe("function");
    expect(serveMock).not.toHaveBeenCalled();
  });
});

describe("Ekklesia API shutdown lifecycle", () => {
  beforeEach(() => {
    poolConstructor.mockReset();
    betterAuthMock.mockReset();
    drizzleAdapterMock.mockClear();
    serveMock.mockReset();
  });

  it("makes every concurrent shutdown caller await the exact same server-close and pool-close, each exactly once", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    const { server } = mockSuccessfulServe();

    const running = await startApi(validConfig());

    await Promise.all([running.shutdown(), running.shutdown(), running.shutdown()]);

    expect(server.close).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("constructs exactly one physical PostgreSQL pool for both the identity and authorization views, and closes only that one pool on shutdown", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    mockSuccessfulServe();

    const running = await startApi(validConfig());

    // Identity (via Better Auth's Drizzle adapter) and authorization both read from the same
    // running API, yet only one `new Pool(...)` call is ever made — proving the shared-pool
    // composition in apps/api/src/database.ts never falls back to a second, independent pool.
    expect(poolConstructor).toHaveBeenCalledTimes(1);

    await running.shutdown();

    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("keeps shutdown idempotent for calls made after the first has already resolved", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    const { server } = mockSuccessfulServe();

    const running = await startApi(validConfig());
    await running.shutdown();
    await running.shutdown();

    expect(server.close).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("closes an already-created database pool when identity construction fails during startup", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockImplementation(() => {
      throw new Error("postgresql://admin:secret@db.internal.example/x");
    });

    await expect(startApi(validConfig())).rejects.toMatchObject({
      code: "IDENTITY_CONSTRUCTION_FAILED",
    });

    expect(poolConstructor).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("refuses a production configuration that enables public signup before any pool, Better Auth instance, module runtime, or server exists", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    mockSuccessfulServe();

    // The rejection happens in `createApiRuntimeConfig` itself — the same boundary the executable
    // entry point calls before `startApi` — so `startApi` is never even reachable with such a
    // configuration, and no runtime resource is ever constructed to leak.
    let captured: unknown;
    try {
      createApiRuntimeConfig(
        {
          databaseUrl: "postgresql://ekklesia:ekklesia@127.0.0.1:5432/ekklesia",
          host: "127.0.0.1",
          identity: {
            baseUrl: "https://identity.example.test",
            publicSignupEnabled: true,
            secret: "correct-horse-battery-staple-0123456789",
            trustedOrigins: ["https://identity.example.test"],
          },
          port: 0,
        },
        { environment: "production" },
      );
    } catch (error) {
      captured = error;
    }

    expect(captured).toMatchObject({ code: "PUBLIC_SIGNUP_UNSUPPORTED_IN_PRODUCTION" });
    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
    expect(poolEnd).not.toHaveBeenCalled();
  });

  it("refuses an unsafe production database transport before any pool, Better Auth instance, module runtime, or server exists", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    mockSuccessfulServe();

    // Both an explicit production plaintext selection and a URL that would silently downgrade the
    // policy are rejected in `createApiRuntimeConfig` — the same boundary the executable entry
    // point calls before `startApi` — so no runtime resource is ever constructed to leak.
    for (const [label, input] of [
      [
        "explicit production plaintext",
        {
          databaseTransport: { mode: "disable" },
          databaseUrl: "postgresql://ekklesia:ekklesia@db.example.test:5432/ekklesia",
        },
      ],
      [
        "connection-string TLS downgrade",
        {
          databaseUrl:
            "postgresql://ekklesia:ekklesia@db.example.test:5432/ekklesia?sslmode=disable",
        },
      ],
    ] as const) {
      let captured: unknown;
      try {
        createApiRuntimeConfig(
          {
            host: "127.0.0.1",
            identity: {
              baseUrl: "https://identity.example.test",
              secret: "correct-horse-battery-staple-0123456789",
              trustedOrigins: ["https://identity.example.test"],
            },
            port: 0,
            ...input,
          },
          { environment: "production" },
        );
      } catch (error) {
        captured = error;
      }
      expect(captured, `expected ${label} to be rejected`).toBeInstanceOf(Error);
      expect(poolConstructor).not.toHaveBeenCalled();
      expect(betterAuthMock).not.toHaveBeenCalled();
      expect(serveMock).not.toHaveBeenCalled();
      expect(poolEnd).not.toHaveBeenCalled();
    }
  });

  it("closes an already-created database pool when the server fails to bind its listen address", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    mockFailingServe(new Error("EADDRINUSE"));

    await expect(startApi(validConfig())).rejects.toThrow();

    expect(poolConstructor).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("wires SIGINT/SIGTERM to the same shutdown lifecycle and only calls the injected exit, never the real process.exit", async () => {
    const { handlers, restore } = mockProcessOn();
    const shutdown = vi.fn().mockResolvedValue(undefined);
    const exit = vi.fn();

    installShutdownSignalHandlers({ shutdown }, exit);

    expect(handlers.SIGINT).toEqual(expect.any(Function));
    expect(handlers.SIGTERM).toEqual(expect.any(Function));

    handlers.SIGINT?.();
    await Promise.resolve();
    await Promise.resolve();

    expect(shutdown).toHaveBeenCalledTimes(1);
    expect(exit).toHaveBeenCalledWith(0);

    // A second signal after the first must not trigger a second shutdown.
    handlers.SIGTERM?.();
    await Promise.resolve();
    expect(shutdown).toHaveBeenCalledTimes(1);
    expect(exit).toHaveBeenCalledTimes(1);

    restore();
  });

  it("exits with a failure code, without throwing, when signal-triggered shutdown itself fails", async () => {
    const { handlers, restore } = mockProcessOn();
    const shutdown = vi.fn().mockRejectedValue(new Error("pool close failed"));
    const exit = vi.fn();

    installShutdownSignalHandlers({ shutdown }, exit);
    handlers.SIGTERM?.();
    await Promise.resolve();
    await Promise.resolve();

    expect(exit).toHaveBeenCalledWith(1);

    restore();
  });
});

describe("Ekklesia API Node server timeouts", () => {
  beforeEach(() => {
    poolConstructor.mockReset();
    betterAuthMock.mockReset();
    drizzleAdapterMock.mockClear();
    serveMock.mockReset();
  });

  it("configures finite, typed header/request/keep-alive timeouts on the underlying Node server", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    mockSuccessfulServe();

    const running = await startApi(validConfig());

    expect(serveMock).toHaveBeenCalledTimes(1);
    const [options] = serveMock.mock.calls[0] as [
      {
        serverOptions?: {
          connectionsCheckingInterval?: number;
          headersTimeout?: number;
          keepAliveTimeout?: number;
          requestTimeout?: number;
        };
      },
    ];
    expect(options.serverOptions?.headersTimeout).toBeGreaterThan(0);
    expect(options.serverOptions?.requestTimeout).toBeGreaterThan(0);
    expect(options.serverOptions?.keepAliveTimeout).toBeGreaterThan(0);
    // Node only enforces headersTimeout/requestTimeout when this periodic check runs (verified
    // directly against the pinned Node runtime — its own default, 30s, would otherwise let a
    // violating connection sit for up to an additional 30s past its actual timeout).
    expect(options.serverOptions?.connectionsCheckingInterval).toBeGreaterThan(0);
    expect(options.serverOptions?.connectionsCheckingInterval).toBeLessThan(30_000);
    // Node requires headersTimeout not to exceed requestTimeout.
    expect(options.serverOptions?.headersTimeout).toBeLessThanOrEqual(
      options.serverOptions?.requestTimeout ?? 0,
    );

    await running.shutdown();
  });

  it("allows a test-only override to narrow the timeouts without changing the production defaults", async () => {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    mockSuccessfulServe();

    const running = await startApi(validConfig(), {
      nodeServerTimeoutOverride: { headersTimeoutMs: 50, requestTimeoutMs: 100 },
    });

    const [options] = serveMock.mock.calls[0] as [
      {
        serverOptions?: {
          headersTimeout?: number;
          keepAliveTimeout?: number;
          requestTimeout?: number;
        };
      },
    ];
    expect(options.serverOptions?.headersTimeout).toBe(50);
    expect(options.serverOptions?.requestTimeout).toBe(100);
    // The un-overridden keep-alive timeout keeps its production default.
    expect(options.serverOptions?.keepAliveTimeout).toBeGreaterThan(0);

    await running.shutdown();
  });

  // Whether Node actually *emits* anything for a real header/request timeout — and that exactly one
  // 408 is written, the socket closes, and no handler runs — is proven only at the real transport
  // boundary, by the raw-socket scenarios in `apps/api/tests/api-http.integration.ts`. Node's
  // general `'timeout'` event is NOT that path (it belongs to `server.setTimeout()`, which this
  // server never arms); `'clientError'` is. The tests below therefore deliberately do not claim to
  // prove the event path at all — they cover only the response-reproduction logic that Node's own
  // default would otherwise have performed, including the duplicate-response guard, which is
  // impractical to drive from a real socket.
  function fakeErrorSocket(overrides: { headersSent?: boolean; writable?: boolean } = {}) {
    const socket = {
      _httpMessage:
        overrides.headersSent === undefined ? undefined : { headersSent: overrides.headersSent },
      destroy: vi.fn(),
      destroyed: false,
      writable: overrides.writable ?? true,
      write: vi.fn(),
    };
    return socket as unknown as import("node:net").Socket & {
      destroy: ReturnType<typeof vi.fn>;
      write: ReturnType<typeof vi.fn>;
    };
  }

  async function startAndCaptureClientErrorHandler() {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    const { clientErrorHandler } = mockSuccessfulServe();
    const running = await startApi(validConfig());
    const handler = clientErrorHandler();
    if (!handler) {
      throw new Error("Expected startApi to register a clientError handler.");
    }
    return { handler, running };
  }

  it("reproduces Node's own client-error responses byte-for-byte, since registering a listener suppresses them", async () => {
    const { handler, running } = await startAndCaptureClientErrorHandler();
    const errorSpy = vi.spyOn(console, "error").mockImplementation(() => undefined);

    try {
      for (const [code, expected] of [
        ["ERR_HTTP_REQUEST_TIMEOUT", "HTTP/1.1 408 Request Timeout\r\nConnection: close\r\n\r\n"],
        [
          "HPE_HEADER_OVERFLOW",
          "HTTP/1.1 431 Request Header Fields Too Large\r\nConnection: close\r\n\r\n",
        ],
        ["HPE_INVALID_METHOD", "HTTP/1.1 400 Bad Request\r\nConnection: close\r\n\r\n"],
        [undefined, "HTTP/1.1 400 Bad Request\r\nConnection: close\r\n\r\n"],
      ] as const) {
        const socket = fakeErrorSocket();
        const error = Object.assign(new Error("parser detail that must never be logged"), { code });
        handler(error, socket);

        expect(socket.write).toHaveBeenCalledTimes(1);
        expect(socket.write).toHaveBeenCalledWith(expected);
        expect(socket.destroy).toHaveBeenCalledTimes(1);
      }
      await running.shutdown();
    } finally {
      errorSpy.mockRestore();
    }
  });

  it("never writes a second response when a handler already began responding, but still closes the socket", async () => {
    const { handler, running } = await startAndCaptureClientErrorHandler();
    const errorSpy = vi.spyOn(console, "error").mockImplementation(() => undefined);

    try {
      const socket = fakeErrorSocket({ headersSent: true });
      handler(Object.assign(new Error("timeout"), { code: "ERR_HTTP_REQUEST_TIMEOUT" }), socket);

      expect(socket.write).not.toHaveBeenCalled();
      expect(socket.destroy).toHaveBeenCalledTimes(1);

      // An unwritable socket is likewise never written to, only destroyed.
      const closedSocket = fakeErrorSocket({ writable: false });
      handler(
        Object.assign(new Error("timeout"), { code: "ERR_HTTP_REQUEST_TIMEOUT" }),
        closedSocket,
      );
      expect(closedSocket.write).not.toHaveBeenCalled();
      expect(closedSocket.destroy).toHaveBeenCalledTimes(1);

      await running.shutdown();
    } finally {
      errorSpy.mockRestore();
    }
  });

  it("logs one fixed sanitized line per client error, never the caught error's own message", async () => {
    const { handler, running } = await startAndCaptureClientErrorHandler();
    const errorSpy = vi.spyOn(console, "error").mockImplementation(() => undefined);

    try {
      handler(
        Object.assign(new Error("Parse Error: /secret-path?token=abc123"), {
          code: "HPE_INVALID_METHOD",
        }),
        fakeErrorSocket(),
      );

      expect(errorSpy).toHaveBeenCalledTimes(1);
      const emitted = errorSpy.mock.calls.flat().map(String).join("\n");
      expect(emitted).not.toContain("secret-path");
      expect(emitted).not.toContain("abc123");
      expect(emitted).not.toContain("Parse Error");
      expect(emitted).not.toContain("HPE_");
      expect(emitted).not.toMatch(/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/u);

      await running.shutdown();
    } finally {
      errorSpy.mockRestore();
    }
  });
});

describe("Ekklesia API module permission composition at startup", () => {
  afterEach(async () => {
    await Promise.all(
      temporaryDirectories.splice(0).map((directory) => rm(directory, { recursive: true })),
    );
  });

  beforeEach(() => {
    poolConstructor.mockReset();
    betterAuthMock.mockReset();
    drizzleAdapterMock.mockClear();
    serveMock.mockReset();
  });

  it("discovers and composes permissions before constructing the database pool, Better Auth, or the HTTP server", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    // An incompatible platform version fails discovery itself (MODULE_PLATFORM_INCOMPATIBLE),
    // before permission composition — and, since composition runs before any pool exists, before
    // any pool, Better Auth instance, or HTTP server could ever be constructed.
    await createFixtureModule(modulesDirectory, "incompatible", {
      compatibility: { moduleSdk: "^0.1.0", platform: ">=99.0.0" },
    });

    await expect(
      startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory }),
    ).rejects.toBeInstanceOf(ModuleDiscoveryError);

    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("fails startup when a module claims the reserved core.* permission namespace, creating no pool, Better Auth instance, or server", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    // Only a module whose own id is literally "core" can produce a "core."-prefixed permission
    // that still passes the manifest's own module-namespace check.
    await createFixtureModule(modulesDirectory, "core", {
      permissions: [
        { baseline: "restricted", description: "Not really Core's.", id: "core.rogue.permission" },
      ],
    });

    let captured: unknown;
    try {
      await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });
    } catch (error) {
      captured = error;
    }

    expect(captured).toBeInstanceOf(ModulePermissionCompositionError);
    expect(captured).toMatchObject({ code: "MODULE_PERMISSION_RESERVED_NAMESPACE" });
    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("fails startup on a duplicate permission declaration, creating no pool, Better Auth instance, or server", async () => {
    const first = fakeDiscoveredModule("calendar", [
      { baseline: "restricted", description: "Read events.", id: "calendar.events.read" },
    ]);
    const second = fakeDiscoveredModule("calendar", [
      { baseline: "public", description: "Also read events.", id: "calendar.events.read" },
    ]);

    let captured: unknown;
    try {
      await startApi(validConfig(), { discoveredModulesOverride: [first, second] });
    } catch (error) {
      captured = error;
    }

    expect(captured).toBeInstanceOf(PermissionRegistryError);
    expect(captured).toMatchObject({ code: "PERMISSION_REGISTRY_DUPLICATE_DECLARATION" });
    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("keeps a reserved-namespace failure and a generic duplicate-declaration failure distinguishable", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    await createFixtureModule(modulesDirectory, "core", {
      permissions: [
        {
          baseline: "restricted",
          description: "Attempting to shadow Core's own permission.",
          id: "core.authorization.grants.manage",
        },
      ],
    });

    let reservedNamespaceError: unknown;
    try {
      await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });
    } catch (error) {
      reservedNamespaceError = error;
    }

    const duplicateModule = fakeDiscoveredModule("calendar", [
      { baseline: "restricted", description: "Read events.", id: "calendar.events.read" },
    ]);
    const duplicateModuleAgain = fakeDiscoveredModule("calendar", [
      { baseline: "restricted", description: "Read events, again.", id: "calendar.events.read" },
    ]);
    let duplicateError: unknown;
    try {
      await startApi(validConfig(), {
        discoveredModulesOverride: [duplicateModule, duplicateModuleAgain],
      });
    } catch (error) {
      duplicateError = error;
    }

    // Even though the first scenario's module attempted to exactly collide with an existing
    // Core-owned permission id, it is reported as a reserved-namespace violation, never as a
    // generic duplicate — the two failure families never overlap.
    expect(reservedNamespaceError).toBeInstanceOf(ModulePermissionCompositionError);
    expect(reservedNamespaceError).not.toBeInstanceOf(PermissionRegistryError);
    expect(duplicateError).toBeInstanceOf(PermissionRegistryError);
    expect(duplicateError).not.toBeInstanceOf(ModulePermissionCompositionError);
  });

  it("still constructs exactly one pool and succeeds when zero modules are installed", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    mockSuccessfulServe();

    const running = await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });

    expect(poolConstructor).toHaveBeenCalledTimes(1);
    await running.shutdown();
    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("does not perform module discovery merely by importing the platform-permissions module", async () => {
    const module = await import("../src/platform-permissions.js");

    expect(typeof module.composeStartupPermissionRegistry).toBe("function");
    expect(poolConstructor).not.toHaveBeenCalled();
  });
});

describe("Ekklesia API module runtime startup and shutdown", () => {
  afterEach(async () => {
    const globalValues = globalThis as unknown as Record<PropertyKey, unknown>;
    for (const symbol of eventSymbols.splice(0)) {
      delete globalValues[symbol];
    }
    await Promise.all(
      temporaryDirectories.splice(0).map((directory) => rm(directory, { recursive: true })),
    );
  });

  beforeEach(() => {
    poolConstructor.mockReset();
    betterAuthMock.mockReset();
    drizzleAdapterMock.mockClear();
    serveMock.mockReset();
    vi.mocked(createApiApp).mockClear();
  });

  function mockPoolAndAuth(): { poolEnd: ReturnType<typeof vi.fn> } {
    const poolEnd = vi.fn().mockResolvedValue(undefined);
    poolConstructor.mockImplementation(function fakePool() {
      return { end: poolEnd, on: vi.fn() };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    return { poolEnd };
  }

  it("starts the module runtime from the exact discovered inventory permission composition used, mounting routes in discovery order", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "alpha", recorder, { withRoute: true });
    await createWorkingFixtureModule(modulesDirectory, "beta", recorder, { withRoute: true });
    mockPoolAndAuth();
    mockSuccessfulServe();

    const running = await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });

    expect(recorder.events).toEqual([
      "alpha:register",
      "beta:register",
      "alpha:start",
      "beta:start",
    ]);
    // Hono records one internal route entry per handler in a route's middleware chain, not one
    // per logical route, so entries for the same method/path are deduplicated (preserving first-
    // seen order) before asserting mounting order.
    const moduleRoutePaths = [
      ...new Set(
        running.app.routes
          .filter((route) => route.path.startsWith("/api/v1/modules/"))
          .map((route) => `${route.method} ${route.path}`),
      ),
    ];
    expect(moduleRoutePaths).toEqual([
      "GET /api/v1/modules/alpha/ping",
      "GET /api/v1/modules/beta/ping",
    ]);

    await running.shutdown();
  });

  it("gives a module's HTTP handler the exact same database facade object its own start hook received", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const refs = createReferenceRecorder();
    await createFixtureModule(modulesDirectory, "db-identity", {
      permissions: [{ baseline: "public", description: "Ping.", id: "db-identity.ping.read" }],
    });
    await writeFile(
      path.join(modulesDirectory, "db-identity", "dist/server/index.js"),
      `export default {
        id: "db-identity",
        version: "0.1.0",
        register({ http }) {
          http.route({
            method: "GET",
            path: "/ping",
            permission: "db-identity.ping.read",
            maxBodyBytes: 0,
            handler: async (_request, context) => {
              ${refs.expression}.push(context.services.database);
              return new Response(null, { status: 204 });
            },
          });
        },
        start(context) {
          ${refs.expression}.push(context.services.database);
        }
      };`,
    );
    mockPoolAndAuth();
    mockSuccessfulServe();

    const running = await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });
    const response = await running.app.request("/api/v1/modules/db-identity/ping");

    expect(response.status).toBe(204);
    expect(refs.values).toHaveLength(2);
    expect(refs.values[0]).toBeDefined();
    expect(refs.values[0]).toBe(refs.values[1]);

    await running.shutdown();
  });

  it("closes the pool exactly once and binds no server when a module's entrypoint fails to load", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    await createFixtureModule(modulesDirectory, "broken-export");
    await writeFile(
      path.join(modulesDirectory, "broken-export", "dist/server/index.js"),
      "export default { thisIsNotAValidRuntimeDefinition: true };",
    );
    const { poolEnd } = mockPoolAndAuth();

    await expect(
      startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory }),
    ).rejects.toMatchObject({
      issues: [expect.objectContaining({ code: "MODULE_RUNTIME_EXPORT_INVALID" })],
    });

    expect(poolConstructor).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("closes the pool exactly once and binds no server when a module's register hook fails", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "register-fails", recorder, {
      registerThrows: true,
    });
    const { poolEnd } = mockPoolAndAuth();

    await expect(
      startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory }),
    ).rejects.toMatchObject({
      issues: [expect.objectContaining({ code: "MODULE_REGISTER_FAILED" })],
    });

    expect(recorder.events).toEqual(["register-fails:register"]);
    expect(poolConstructor).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("closes the pool exactly once and binds no server when a module's start hook fails, preserving Core's rollback of already-started modules", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "one", recorder);
    await createWorkingFixtureModule(modulesDirectory, "two", recorder, {
      dependencies: { modules: { required: { one: "^0.1.0" } } },
      startThrows: true,
    });
    const { poolEnd } = mockPoolAndAuth();

    await expect(
      startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory }),
    ).rejects.toMatchObject({
      issues: [expect.objectContaining({ code: "MODULE_START_FAILED" })],
    });

    // The module whose start hook failed is rolled back first through its own stop hook, then the
    // module that had already started, in reverse order.
    expect(recorder.events).toEqual([
      "one:register",
      "two:register",
      "one:start",
      "two:start",
      "two:stop",
      "one:stop",
    ]);
    expect(poolConstructor).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("stops the module runtime and closes the pool, binding no server, when app construction fails", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "mounted", recorder);
    const { poolEnd } = mockPoolAndAuth();
    vi.mocked(createApiApp).mockImplementationOnce(() => {
      throw new Error("forced app construction failure");
    });

    await expect(
      startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory }),
    ).rejects.toThrow("forced app construction failure");

    expect(recorder.events).toEqual(["mounted:register", "mounted:start", "mounted:stop"]);
    expect(poolConstructor).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
    expect(serveMock).not.toHaveBeenCalled();
  });

  it("stops the module runtime and closes the pool when the server fails to bind", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "mounted", recorder);
    const { poolEnd } = mockPoolAndAuth();
    mockFailingServe(new Error("EADDRINUSE"));

    await expect(
      startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory }),
    ).rejects.toThrow();

    expect(recorder.events).toEqual(["mounted:register", "mounted:start", "mounted:stop"]);
    expect(poolConstructor).toHaveBeenCalledTimes(1);
    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("drains the HTTP server, then stops the module runtime, then closes the pool, in that exact order", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "ordered", recorder);
    poolConstructor.mockImplementation(function fakePool() {
      return {
        end: vi.fn(async () => {
          recorder.events.push("pool:end");
        }),
        on: vi.fn(),
      };
    });
    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
    const { server } = mockSuccessfulServe();
    const originalClose = server.close;
    server.close = vi.fn((callback?: () => void) => {
      recorder.events.push("server:close");
      return originalClose(callback);
    });

    const running = await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });
    recorder.events.length = 0;
    await running.shutdown();

    expect(recorder.events).toEqual(["server:close", "ordered:stop", "pool:end"]);
  });

  it("gives a module's stop hook the exact same database facade object its start hook received, while the pool is still open", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const refs = createReferenceRecorder();
    await createFixtureModule(modulesDirectory, "db-stop-identity");
    await writeFile(
      path.join(modulesDirectory, "db-stop-identity", "dist/server/index.js"),
      `export default {
        id: "db-stop-identity",
        version: "0.1.0",
        start(context) { ${refs.expression}.push(context.services.database); },
        stop(context) { ${refs.expression}.push(context.services.database); }
      };`,
    );
    const { poolEnd } = mockPoolAndAuth();
    mockSuccessfulServe();

    const running = await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });
    await running.shutdown();

    expect(refs.values).toHaveLength(2);
    expect(refs.values[0]).toBeDefined();
    expect(refs.values[0]).toBe(refs.values[1]);
    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("still runs pool cleanup and lets the shutdown rejection surface when the module runtime fails to stop", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "stop-fails", recorder, {
      stopThrows: true,
    });
    const { poolEnd } = mockPoolAndAuth();
    mockSuccessfulServe();

    const running = await startApi(validConfig(), { modulesDirectoryOverride: modulesDirectory });

    // Shutdown now aggregates which stages failed; the module-runtime error is carried intact.
    await expect(running.shutdown()).rejects.toMatchObject({
      drainTimedOut: false,
      moduleStopError: {
        issues: [expect.objectContaining({ code: "MODULE_STOP_FAILED", moduleId: "stop-fails" })],
      },
      moduleStopFailed: true,
      name: "ApiShutdownError",
    });
    expect(poolEnd).toHaveBeenCalledTimes(1);
  });

  it("keeps a direct discoveredModulesOverride driving both permission composition and module runtime startup", async () => {
    const modulesDirectory = await createTemporaryModulesDirectory();
    const recorder = createEventRecorder();
    await createWorkingFixtureModule(modulesDirectory, "calendar", recorder, { withRoute: true });
    const discovered = await (await import("@ekklesia/core/modules")).discoverModules({
      moduleSdkVersion: "0.1.0",
      modulesDirectory,
      platformVersion: "0.1.0",
    });
    mockPoolAndAuth();
    mockSuccessfulServe();

    const running = await startApi(validConfig(), { discoveredModulesOverride: discovered });

    expect(recorder.events).toEqual(["calendar:register", "calendar:start"]);
    // Hono records one internal route entry per handler in a route's middleware chain, not one
    // per logical route, so entries for the same method/path are deduplicated (preserving first-
    // seen order) before asserting mounting order.
    const moduleRoutePaths = [
      ...new Set(
        running.app.routes
          .filter((route) => route.path.startsWith("/api/v1/modules/"))
          .map((route) => `${route.method} ${route.path}`),
      ),
    ];
    expect(moduleRoutePaths).toEqual(["GET /api/v1/modules/calendar/ping"]);

    await running.shutdown();
  });

  it("performs no filesystem I/O, module import, pool construction, Better Auth construction, or server binding merely by importing the module-route adapter", async () => {
    const module = await import("../src/module-http-routes.js");

    expect(typeof module.mountModuleHttpRoutes).toBe("function");
    expect(poolConstructor).not.toHaveBeenCalled();
    expect(betterAuthMock).not.toHaveBeenCalled();
    expect(serveMock).not.toHaveBeenCalled();
  });
});