import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import type { ModuleDatabase, ModuleRuntimeServices } from "@ekklesia/contracts";
import { afterEach, describe, expect, it, vi } from "vitest";
import { discoverModules } from "../src/modules/discovery.js";
import {
  ModuleDiscoveryError,
  ModuleRuntimeError,
  type ModuleRuntimeIssueCode,
  startDiscoveredModuleRuntime,
  startModuleRuntime,
} from "../src/modules/index.js";

vi.mock("../src/modules/discovery.js", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../src/modules/discovery.js")>();
  return { ...actual, discoverModules: vi.fn(actual.discoverModules) };
});

interface RuntimeModuleFixture {
  readonly directory?: string;
  readonly manifest?: Record<string, unknown>;
  readonly packageJson?: Record<string, unknown>;
  readonly serverSource: string;
}

const temporaryDirectories: string[] = [];
const eventSymbols: symbol[] = [];

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 })),
  );
});

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

function manifestFor(
  id: string,
  options: {
    capabilities?: Array<{ id: string; version: string }>;
    dependencies?: Record<string, unknown>;
    permissions?: Array<{ id: string; baseline: string; description: string }>;
  } = {},
): Record<string, unknown> {
  return {
    manifestVersion: 3,
    id,
    name: `${id} module`,
    version: "0.1.0",
    compatibility: {
      platform: "^0.1.0",
      moduleSdk: "^0.1.0",
    },
    capabilities: options.capabilities ?? [],
    permissions: options.permissions ?? [],
    ...(options.dependencies ? { dependencies: options.dependencies } : {}),
    entrypoints: {
      server: "./dist/server/index.js",
    },
  };
}

async function createRuntimeModule(
  modulesDirectory: string,
  id: string,
  fixture: RuntimeModuleFixture,
): Promise<void> {
  const directoryName = fixture.directory ?? id;
  const moduleDirectory = path.join(modulesDirectory, directoryName);
  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
  await Promise.all([
    writeFile(
      path.join(moduleDirectory, "package.json"),
      JSON.stringify(
        fixture.packageJson ?? {
          name: `@test/module-${id}`,
          version: "0.1.0",
          type: "module",
          ekklesia: { layer: "module" },
        },
      ),
    ),
    writeFile(
      path.join(moduleDirectory, "ekklesia.module.json"),
      JSON.stringify(fixture.manifest ?? manifestFor(id)),
    ),
    writeFile(path.join(moduleDirectory, "dist/server/index.js"), fixture.serverSource),
  ]);
}

function createEventRecorder(): { events: string[]; expression: string } {
  const key = `ekklesia.runtime.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 for capturing an actual object
 * reference (such as `context.services`) pushed from inside a dynamically imported fixture module,
 * rather than a string label — dynamic `import()` of a file:// URL still shares this process's
 * heap, so a reference pushed from the fixture and read back here is the exact same object. */
function createReferenceRecorder(): { values: unknown[]; expression: string } {
  const key = `ekklesia.runtime.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)})]`,
  };
}

/** A small typed fake `ModuleDatabase` — no PostgreSQL required for these unit tests, which only
 * ever assert on context wiring and object identity, never on actual query behavior. */
function fakeModuleDatabase(): ModuleDatabase {
  return Object.freeze({
    delete: vi.fn(),
    execute: vi.fn(),
    insert: vi.fn(),
    select: vi.fn(),
    selectDistinct: vi.fn(),
    selectDistinctOn: vi.fn(),
    transaction: vi.fn(),
    update: vi.fn(),
  }) as unknown as ModuleDatabase;
}

function fakeModuleRuntimeServices(): ModuleRuntimeServices {
  return Object.freeze({ database: fakeModuleDatabase() });
}

function runtimeOptions(
  modulesDirectory: string,
  services: ModuleRuntimeServices = fakeModuleRuntimeServices(),
) {
  return {
    moduleSdkVersion: "0.1.0",
    modulesDirectory,
    platformVersion: "0.1.0",
    services,
  };
}

function runtimeIssueCodes(error: ModuleRuntimeError): ModuleRuntimeIssueCode[] {
  return error.issues.map((issue) => issue.code);
}

async function captureRuntimeError(modulesDirectory: string): Promise<ModuleRuntimeError> {
  try {
    await startModuleRuntime(runtimeOptions(modulesDirectory));
  } catch (error) {
    if (error instanceof ModuleRuntimeError) {
      return error;
    }
    throw error;
  }
  throw new Error("Expected module runtime startup to fail.");
}

describe("module runtime", () => {
  it("discovers, loads, registers, starts, and stops dependency-first modules end to end", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createEventRecorder();
    await createRuntimeModule(modulesDirectory, "people", {
      manifest: manifestFor("people", {
        capabilities: [{ id: "people.records", version: "2.1.0" }],
      }),
      serverSource: `
        export default {
          id: "people",
          version: "0.1.0",
          register({ capabilities }) {
            ${recorder.expression}.push("people:register");
            capabilities.provide("people.records", { kind: "people-records" });
          },
          start() { ${recorder.expression}.push("people:start"); },
          stop() { ${recorder.expression}.push("people:stop"); }
        };
      `,
    });
    await createRuntimeModule(modulesDirectory, "calendar", {
      manifest: manifestFor("calendar", {
        capabilities: [{ id: "calendar.events", version: "1.0.0" }],
        dependencies: {
          capabilities: { required: { "people.records": "^2.0.0" } },
        },
      }),
      serverSource: `
        export default {
          id: "calendar",
          version: "0.1.0",
          register({ capabilities }) {
            ${recorder.expression}.push("calendar:register");
            const people = capabilities.resolve("people.records");
            if (!people || people.version !== "2.1.0") throw new Error("people unavailable");
            capabilities.provide("calendar.events", { kind: "calendar-events" });
          },
          start({ capabilities }) {
            if (!capabilities.resolve("people.records")) throw new Error("people unavailable");
            ${recorder.expression}.push("calendar:start");
          },
          stop() { ${recorder.expression}.push("calendar:stop"); }
        };
      `,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));

    expect(recorder.events).toEqual([
      "people:register",
      "calendar:register",
      "people:start",
      "calendar:start",
    ]);
    expect(runtime.modules.map((module) => module.id)).toEqual(["people", "calendar"]);
    expect(runtime.capabilities.resolve("people.records")).toMatchObject({
      moduleId: "people",
      version: "2.1.0",
    });
    expect(runtime.capabilities.list().map((capability) => capability.id)).toEqual([
      "calendar.events",
      "people.records",
    ]);

    await Promise.all([runtime.stop(), runtime.stop()]);
    expect(recorder.events.slice(-2)).toEqual(["calendar:stop", "people:stop"]);
  });

  it("completes discovery before importing any server entrypoint", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createEventRecorder();
    await createRuntimeModule(modulesDirectory, "valid", {
      serverSource: `${recorder.expression}.push("valid:import"); export default { id: "valid", version: "0.1.0" };`,
    });
    await createRuntimeModule(modulesDirectory, "invalid", {
      manifest: { ...manifestFor("invalid"), manifestVersion: 1 },
      serverSource: `${recorder.expression}.push("invalid:import"); export default { id: "invalid", version: "0.1.0" };`,
    });

    await expect(startModuleRuntime(runtimeOptions(modulesDirectory))).rejects.toBeInstanceOf(
      ModuleDiscoveryError,
    );
    expect(recorder.events).toEqual([]);
  });

  it("validates every imported definition before running registration hooks", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createEventRecorder();
    await createRuntimeModule(modulesDirectory, "alpha", {
      serverSource: `export default {
        id: "alpha", version: "0.1.0",
        register() { ${recorder.expression}.push("alpha:register"); }
      };`,
    });
    await createRuntimeModule(modulesDirectory, "beta", {
      serverSource: `export default { id: "wrong-id", version: "0.1.0" };`,
    });
    await createRuntimeModule(modulesDirectory, "gamma", {
      serverSource: `export default { id: "gamma", version: "9.0.0" };`,
    });

    const error = await captureRuntimeError(modulesDirectory);

    expect(runtimeIssueCodes(error)).toEqual([
      "MODULE_RUNTIME_ID_MISMATCH",
      "MODULE_RUNTIME_VERSION_MISMATCH",
    ]);
    expect(recorder.events).toEqual([]);
  });

  it("rejects incomplete and undeclared capability registration before startup", async () => {
    const missingDirectory = await createModulesDirectory();
    await createRuntimeModule(missingDirectory, "missing", {
      manifest: manifestFor("missing", {
        capabilities: [{ id: "missing.records", version: "1.0.0" }],
      }),
      serverSource: `export default { id: "missing", version: "0.1.0", register() {} };`,
    });
    let error = await captureRuntimeError(missingDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_CAPABILITY_UNREGISTERED"]);

    const undeclaredDirectory = await createModulesDirectory();
    await createRuntimeModule(undeclaredDirectory, "undeclared", {
      serverSource: `export default {
        id: "undeclared", version: "0.1.0",
        register({ capabilities }) { capabilities.provide("undeclared.extra", {}); }
      };`,
    });
    error = await captureRuntimeError(undeclaredDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_CAPABILITY_UNDECLARED"]);
  });

  it("restricts module capability lookup to declared ownership and dependencies", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "snooper", {
      serverSource: `export default {
        id: "snooper", version: "0.1.0",
        register({ capabilities }) { capabilities.resolve("people.records"); }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_CAPABILITY_ACCESS_UNDECLARED"]);
  });

  it("rejects malformed runtime capability IDs without echoing their contents", async () => {
    const modulesDirectory = await createModulesDirectory();
    const unsafeCapabilityId = "secret-token at /machine/private/path";
    await createRuntimeModule(modulesDirectory, "unsafe", {
      serverSource: `export default {
        id: "unsafe", version: "0.1.0",
        register({ capabilities }) {
          capabilities.resolve(${JSON.stringify(unsafeCapabilityId)});
        }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_CAPABILITY_ID_INVALID"]);
    expect(`${error.message}\n${error.stack}\n${JSON.stringify(error.issues)}`).not.toContain(
      unsafeCapabilityId,
    );
    expect(error.stack).not.toContain(modulesDirectory);
  });

  it("rolls back started modules in reverse order and aggregates cleanup failures", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createEventRecorder();
    for (const [id, dependency, stopFails] of [
      ["one", undefined, false],
      ["two", "one", true],
      ["three", "two", false],
    ] as const) {
      await createRuntimeModule(modulesDirectory, id, {
        manifest: manifestFor(id, {
          ...(dependency
            ? { dependencies: { modules: { required: { [dependency]: "^0.1.0" } } } }
            : {}),
        }),
        serverSource: `export default {
          id: ${JSON.stringify(id)}, version: "0.1.0",
          start() {
            ${recorder.expression}.push(${JSON.stringify(`${id}:start`)});
            ${id === "three" ? 'throw new Error("secret-token at /private/path");' : ""}
          },
          stop() {
            ${recorder.expression}.push(${JSON.stringify(`${id}:stop`)});
            ${stopFails ? 'throw new Error("rollback secret");' : ""}
          }
        };`,
      });
    }

    const error = await captureRuntimeError(modulesDirectory);

    expect(runtimeIssueCodes(error)).toEqual(["MODULE_START_FAILED", "MODULE_ROLLBACK_FAILED"]);
    expect(recorder.events).toEqual([
      "one:start",
      "two:start",
      "three:start",
      "two:stop",
      "one:stop",
    ]);
    expect(JSON.stringify(error.issues)).not.toContain("secret");
    expect(JSON.stringify(error.issues)).not.toContain("/private/path");
  });

  it("continues reverse shutdown after a module stop failure", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createEventRecorder();
    await createRuntimeModule(modulesDirectory, "provider", {
      serverSource: `export default {
        id: "provider", version: "0.1.0",
        stop() { ${recorder.expression}.push("provider:stop"); }
      };`,
    });
    await createRuntimeModule(modulesDirectory, "consumer", {
      manifest: manifestFor("consumer", {
        dependencies: { modules: { required: { provider: "^0.1.0" } } },
      }),
      serverSource: `export default {
        id: "consumer", version: "0.1.0",
        stop() { ${recorder.expression}.push("consumer:stop"); throw new Error("hidden"); }
      };`,
    });
    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));

    await expect(runtime.stop()).rejects.toMatchObject({
      issues: [expect.objectContaining({ code: "MODULE_STOP_FAILED", moduleId: "consumer" })],
    });
    expect(recorder.events).toEqual(["consumer:stop", "provider:stop"]);
  });

  it("reports import failures without leaking exception text or machine paths", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "broken", {
      serverSource: `throw new Error("database-password at /machine/private/path");`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_RUNTIME_IMPORT_FAILED"]);
    expect(JSON.stringify(error.issues)).not.toContain("database-password");
    expect(JSON.stringify(error.issues)).not.toContain(modulesDirectory);
  });
});

function noopHandlerSource(): string {
  return "() => new Response(null, { status: 204 })";
}

function permissionDeclaration(
  id: string,
  baseline: "authenticated" | "public" | "restricted" = "restricted",
): { id: string; baseline: string; description: string } {
  return { id, baseline, description: `Test permission ${id}.` };
}

describe("module HTTP routes", () => {
  it("registers one route and publishes it on the started runtime", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "single", {
      manifest: manifestFor("single", {
        permissions: [permissionDeclaration("single.items.read")],
      }),
      serverSource: `export default {
        id: "single", version: "0.1.0",
        register({ http }) {
          http.route({
            method: "GET",
            path: "/items",
            permission: "single.items.read",
            maxBodyBytes: 1024,
            handler: ${noopHandlerSource()},
          });
        }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(runtime.routes).toHaveLength(1);
    expect(runtime.routes[0]).toMatchObject({
      moduleId: "single",
      method: "GET",
      path: "/items",
      permission: "single.items.read",
    });
    await runtime.stop();
  });

  it("retains registration order within a module and discovery order across modules", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "alpha", {
      manifest: manifestFor("alpha", {
        permissions: [
          permissionDeclaration("alpha.first.read"),
          permissionDeclaration("alpha.second.read"),
        ],
      }),
      serverSource: `export default {
        id: "alpha", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/first", permission: "alpha.first.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
          http.route({ method: "GET", path: "/second", permission: "alpha.second.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });
    await createRuntimeModule(modulesDirectory, "beta", {
      manifest: manifestFor("beta", {
        permissions: [permissionDeclaration("beta.third.read")],
      }),
      serverSource: `export default {
        id: "beta", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/third", permission: "beta.third.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(
      runtime.routes.map((route) => `${route.moduleId}:${route.method}:${route.path}`),
    ).toEqual(["alpha:GET:/first", "alpha:GET:/second", "beta:GET:/third"]);
    await runtime.stop();
  });

  it("allows the same path under different methods", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "same-path", {
      manifest: manifestFor("same-path", {
        permissions: [
          permissionDeclaration("same-path.items.read"),
          permissionDeclaration("same-path.items.write"),
        ],
      }),
      serverSource: `export default {
        id: "same-path", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "same-path.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
          http.route({ method: "POST", path: "/items", permission: "same-path.items.write", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(runtime.routes.map((route) => `${route.method} ${route.path}`)).toEqual([
      "GET /items",
      "POST /items",
    ]);
    await runtime.stop();
  });

  it("rejects a duplicate method/path route registered by the same module", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "dup", {
      manifest: manifestFor("dup", {
        permissions: [permissionDeclaration("dup.items.read")],
      }),
      serverSource: `export default {
        id: "dup", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "dup.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
          http.route({ method: "GET", path: "/items", permission: "dup.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_ROUTE_DUPLICATE"]);
  });

  it("collides parameter-name-only path variants under the same method", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "param-shape", {
      manifest: manifestFor("param-shape", {
        permissions: [permissionDeclaration("param-shape.events.read")],
      }),
      serverSource: `export default {
        id: "param-shape", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/events/:eventId", permission: "param-shape.events.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
          http.route({ method: "GET", path: "/events/:id", permission: "param-shape.events.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_ROUTE_DUPLICATE"]);
  });

  it("fails a malformed route with its specific structured issue code", async () => {
    const badMethodDirectory = await createModulesDirectory();
    await createRuntimeModule(badMethodDirectory, "bad-method", {
      manifest: manifestFor("bad-method", {
        permissions: [permissionDeclaration("bad-method.items.read")],
      }),
      serverSource: `export default {
        id: "bad-method", version: "0.1.0",
        register({ http }) {
          http.route({ method: "get", path: "/items", permission: "bad-method.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });
    expect(runtimeIssueCodes(await captureRuntimeError(badMethodDirectory))).toEqual([
      "MODULE_ROUTE_METHOD_INVALID",
    ]);

    const badPathDirectory = await createModulesDirectory();
    await createRuntimeModule(badPathDirectory, "bad-path", {
      manifest: manifestFor("bad-path", {
        permissions: [permissionDeclaration("bad-path.items.read")],
      }),
      serverSource: `export default {
        id: "bad-path", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "items", permission: "bad-path.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });
    expect(runtimeIssueCodes(await captureRuntimeError(badPathDirectory))).toEqual([
      "MODULE_ROUTE_PATH_INVALID",
    ]);

    const badMaxBodyBytesDirectory = await createModulesDirectory();
    await createRuntimeModule(badMaxBodyBytesDirectory, "bad-max-body-bytes", {
      manifest: manifestFor("bad-max-body-bytes", {
        permissions: [permissionDeclaration("bad-max-body-bytes.items.read")],
      }),
      serverSource: `export default {
        id: "bad-max-body-bytes", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "bad-max-body-bytes.items.read", maxBodyBytes: -1, handler: ${noopHandlerSource()} });
        }
      };`,
    });
    expect(runtimeIssueCodes(await captureRuntimeError(badMaxBodyBytesDirectory))).toEqual([
      "MODULE_ROUTE_MAX_BODY_BYTES_INVALID",
    ]);

    const badDefinitionDirectory = await createModulesDirectory();
    await createRuntimeModule(badDefinitionDirectory, "bad-shape", {
      manifest: manifestFor("bad-shape", {
        permissions: [permissionDeclaration("bad-shape.items.read")],
      }),
      serverSource: `export default {
        id: "bad-shape", version: "0.1.0",
        register({ http }) {
          http.route({
            method: "GET",
            path: "/items",
            permission: "bad-shape.items.read",
            baseline: "public",
            handler: ${noopHandlerSource()},
          });
        }
      };`,
    });
    expect(runtimeIssueCodes(await captureRuntimeError(badDefinitionDirectory))).toEqual([
      "MODULE_ROUTE_DEFINITION_INVALID",
    ]);
  });

  it("rejects a route permission the registering module does not itself declare", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "undeclared", {
      manifest: manifestFor("undeclared"),
      serverSource: `export default {
        id: "undeclared", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "undeclared.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_ROUTE_PERMISSION_UNDECLARED"]);
  });

  it("rejects a module gating a route with a Core-owned permission it cannot declare", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "coreattempt", {
      manifest: manifestFor("coreattempt"),
      serverSource: `export default {
        id: "coreattempt", version: "0.1.0",
        register({ http }) {
          http.route({
            method: "GET",
            path: "/items",
            permission: "core.authorization.grants.manage",
            maxBodyBytes: 1024,
            handler: ${noopHandlerSource()},
          });
        }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_ROUTE_PERMISSION_UNDECLARED"]);
  });

  it("rejects a module gating a route with another module's permission", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "alpha", {
      manifest: manifestFor("alpha", {
        permissions: [permissionDeclaration("alpha.items.read")],
      }),
      serverSource: `export default { id: "alpha", version: "0.1.0" };`,
    });
    await createRuntimeModule(modulesDirectory, "beta", {
      manifest: manifestFor("beta"),
      serverSource: `export default {
        id: "beta", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "alpha.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_ROUTE_PERMISSION_UNDECLARED"]);
  });

  it("accepts a declared public, authenticated, or restricted permission without interpreting its baseline", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "baselines", {
      manifest: manifestFor("baselines", {
        permissions: [
          permissionDeclaration("baselines.public.read", "public"),
          permissionDeclaration("baselines.authenticated.read", "authenticated"),
          permissionDeclaration("baselines.restricted.read", "restricted"),
        ],
      }),
      serverSource: `export default {
        id: "baselines", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/public", permission: "baselines.public.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
          http.route({ method: "GET", path: "/authenticated", permission: "baselines.authenticated.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
          http.route({ method: "GET", path: "/restricted", permission: "baselines.restricted.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(runtime.routes).toHaveLength(3);
    for (const route of runtime.routes) {
      expect(Object.keys(route).sort()).toEqual([
        "handler",
        "maxBodyBytes",
        "method",
        "moduleId",
        "path",
        "permission",
      ]);
    }
    await runtime.stop();
  });

  it("never invokes a route handler while registering or starting", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createEventRecorder();
    await createRuntimeModule(modulesDirectory, "never-invoked", {
      manifest: manifestFor("never-invoked", {
        permissions: [permissionDeclaration("never-invoked.items.read")],
      }),
      serverSource: `export default {
        id: "never-invoked", version: "0.1.0",
        register({ http }) {
          http.route({
            method: "GET",
            path: "/items",
            permission: "never-invoked.items.read",
            maxBodyBytes: 1024,
            handler: () => { ${recorder.expression}.push("handler:called"); return new Response(null, { status: 204 }); },
          });
        }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(recorder.events).toEqual([]);
    await runtime.stop();
    expect(recorder.events).toEqual([]);
  });

  it("publishes frozen, immutable routes as a frozen route list", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "frozen", {
      manifest: manifestFor("frozen", {
        permissions: [permissionDeclaration("frozen.items.read")],
      }),
      serverSource: `export default {
        id: "frozen", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "frozen.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(Object.isFrozen(runtime.routes)).toBe(true);
    expect(Object.isFrozen(runtime.routes[0])).toBe(true);
    await runtime.stop();
  });

  it("does not let a module mutate the published route by mutating its own definition afterward", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "mutate", {
      manifest: manifestFor("mutate", {
        permissions: [
          permissionDeclaration("mutate.items.read"),
          permissionDeclaration("mutate.other.read"),
        ],
      }),
      serverSource: `export default {
        id: "mutate", version: "0.1.0",
        register({ http }) {
          const definition = {
            method: "GET",
            path: "/items",
            permission: "mutate.items.read",
            maxBodyBytes: 1024,
            handler: ${noopHandlerSource()},
          };
          http.route(definition);
          definition.method = "POST";
          definition.path = "/mutated";
          definition.permission = "mutate.other.read";
        }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(runtime.routes[0]).toMatchObject({
      method: "GET",
      path: "/items",
      permission: "mutate.items.read",
    });
    await runtime.stop();
  });

  it("publishes no runtime when a later module's route registration fails", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "first-ok", {
      manifest: manifestFor("first-ok", {
        permissions: [permissionDeclaration("first-ok.items.read")],
      }),
      serverSource: `export default {
        id: "first-ok", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "first-ok.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });
    await createRuntimeModule(modulesDirectory, "second-bad", {
      manifest: manifestFor("second-bad"),
      serverSource: `export default {
        id: "second-bad", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "second-bad.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_ROUTE_PERMISSION_UNDECLARED"]);
    expect(error.issues[0]?.moduleId).toBe("second-bad");
  });

  it("preserves existing rollback behavior when a registered route's module later fails to start", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createEventRecorder();
    await createRuntimeModule(modulesDirectory, "routed", {
      manifest: manifestFor("routed", {
        permissions: [permissionDeclaration("routed.items.read")],
      }),
      serverSource: `export default {
        id: "routed", version: "0.1.0",
        register({ http }) {
          http.route({ method: "GET", path: "/items", permission: "routed.items.read", maxBodyBytes: 1024, handler: ${noopHandlerSource()} });
        },
        start() { ${recorder.expression}.push("routed:start"); },
        stop() { ${recorder.expression}.push("routed:stop"); }
      };`,
    });
    await createRuntimeModule(modulesDirectory, "failing", {
      manifest: manifestFor("failing", {
        dependencies: { modules: { required: { routed: "^0.1.0" } } },
      }),
      serverSource: `export default {
        id: "failing", version: "0.1.0",
        start() { throw new Error("boom"); }
      };`,
    });

    const error = await captureRuntimeError(modulesDirectory);
    expect(runtimeIssueCodes(error)).toEqual(["MODULE_START_FAILED"]);
    expect(recorder.events).toEqual(["routed:start", "routed:stop"]);
  });
});

describe("already-discovered module runtime", () => {
  it("starts from an already-discovered inventory without a second directory scan", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "already-discovered", {
      serverSource: `export default { id: "already-discovered", version: "0.1.0" };`,
    });

    vi.mocked(discoverModules).mockClear();
    const discovered = await discoverModules(runtimeOptions(modulesDirectory));
    expect(discoverModules).toHaveBeenCalledTimes(1);

    const runtime = await startDiscoveredModuleRuntime(discovered, fakeModuleRuntimeServices());
    expect(discoverModules).toHaveBeenCalledTimes(1);
    expect(runtime.modules.map((module) => module.id)).toEqual(["already-discovered"]);
    await runtime.stop();
  });

  it("preserves the given discovered-module list order exactly, without re-sorting", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "first", {
      serverSource: `export default { id: "first", version: "0.1.0" };`,
    });
    await createRuntimeModule(modulesDirectory, "second", {
      serverSource: `export default { id: "second", version: "0.1.0" };`,
    });

    const discovered = await discoverModules(runtimeOptions(modulesDirectory));
    expect(discovered.map((module) => module.manifest.id)).toEqual(["first", "second"]);

    const runtime = await startDiscoveredModuleRuntime(
      [...discovered].reverse(),
      fakeModuleRuntimeServices(),
    );
    expect(runtime.modules.map((module) => module.id)).toEqual(["second", "first"]);
    await runtime.stop();
  });

  it("startModuleRuntime remains backward-compatible and discovers exactly once", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createRuntimeModule(modulesDirectory, "compat", {
      serverSource: `export default { id: "compat", version: "0.1.0" };`,
    });

    vi.mocked(discoverModules).mockClear();
    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory));
    expect(discoverModules).toHaveBeenCalledTimes(1);
    await runtime.stop();
  });
});

describe("module runtime services", () => {
  it("never gives register a services field, and gives start and stop the exact same services object", async () => {
    const modulesDirectory = await createModulesDirectory();
    const services = fakeModuleRuntimeServices();
    const registerServices = createReferenceRecorder();
    const lifecycleServices = createReferenceRecorder();
    await createRuntimeModule(modulesDirectory, "wired", {
      serverSource: `export default {
        id: "wired", version: "0.1.0",
        register(context) { ${registerServices.expression}.push(context.services); },
        start(context) { ${lifecycleServices.expression}.push(context.services); },
        stop(context) { ${lifecycleServices.expression}.push(context.services); }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory, services));
    await runtime.stop();

    expect(registerServices.values).toEqual([undefined]);
    expect(lifecycleServices.values).toHaveLength(2);
    expect(lifecycleServices.values[0]).toBe(services);
    expect(lifecycleServices.values[1]).toBe(services);
  });

  it("shares the exact same services object identity across every module's start hook", async () => {
    const modulesDirectory = await createModulesDirectory();
    const services = fakeModuleRuntimeServices();
    const recorder = createReferenceRecorder();
    await createRuntimeModule(modulesDirectory, "alpha", {
      serverSource: `export default {
        id: "alpha", version: "0.1.0",
        start(context) { ${recorder.expression}.push(context.services); }
      };`,
    });
    await createRuntimeModule(modulesDirectory, "beta", {
      manifest: manifestFor("beta", {
        dependencies: { modules: { required: { alpha: "^0.1.0" } } },
      }),
      serverSource: `export default {
        id: "beta", version: "0.1.0",
        start(context) { ${recorder.expression}.push(context.services); }
      };`,
    });

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory, services));

    expect(recorder.values).toEqual([services, services]);
    await runtime.stop();
  });

  it("gives a rollback stop hook the same services object a start failure left available", async () => {
    const modulesDirectory = await createModulesDirectory();
    const services = fakeModuleRuntimeServices();
    const recorder = createReferenceRecorder();
    await createRuntimeModule(modulesDirectory, "started", {
      serverSource: `export default {
        id: "started", version: "0.1.0",
        start(context) { ${recorder.expression}.push(context.services); },
        stop(context) { ${recorder.expression}.push(context.services); }
      };`,
    });
    await createRuntimeModule(modulesDirectory, "failing", {
      manifest: manifestFor("failing", {
        dependencies: { modules: { required: { started: "^0.1.0" } } },
      }),
      serverSource: `export default {
        id: "failing", version: "0.1.0",
        start() { throw new Error("boom"); }
      };`,
    });

    await expect(
      startModuleRuntime(runtimeOptions(modulesDirectory, services)),
    ).rejects.toBeInstanceOf(ModuleRuntimeError);

    expect(recorder.values).toEqual([services, services]);
  });

  it("starts and stops a zero-module runtime without ever touching the provided services", async () => {
    const modulesDirectory = await createModulesDirectory();
    const services = fakeModuleRuntimeServices();

    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory, services));
    await runtime.stop();

    expect(runtime.modules).toEqual([]);
    expect(vi.mocked(services.database.select)).not.toHaveBeenCalled();
    expect(vi.mocked(services.database.insert)).not.toHaveBeenCalled();
    expect(vi.mocked(services.database.update)).not.toHaveBeenCalled();
    expect(vi.mocked(services.database.delete)).not.toHaveBeenCalled();
    expect(vi.mocked(services.database.execute)).not.toHaveBeenCalled();
    expect(vi.mocked(services.database.transaction)).not.toHaveBeenCalled();
  });
});