import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import {
  ANONYMOUS_PRINCIPAL,
  createAuthenticatedPrincipal,
  type EkklesiaPrincipal,
  type ModuleDatabase,
  type ModuleRuntimeServices,
  parseEkklesiaUserId,
} from "@ekklesia/contracts";
import {
  type AuthorizationStore,
  CORE_MODULES_LIFECYCLE_MANAGE,
  createAuthorizationEvaluator,
} from "@ekklesia/core/authorization";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import {
  composePlatformPermissionRegistry,
  createModuleUiPublicationRegistry,
  type DiscoveredModule,
  discoverModules,
  type ModuleLifecycleStore,
  ModuleLifecycleStoreError,
  EMPTY_MODULE_REALTIME_REGISTRY,
  resolveModuleEligibility,
} from "@ekklesia/core/modules";
import type { Hono } from "hono";
import { afterEach, describe, expect, it, vi } from "vitest";
import { createApiApp } from "../src/app.js";
import { DASHBOARD_NAVIGATION_PATH } from "../src/dashboard-routes.js";
import { CORE_MUTATION_MAX_BODY_BYTES } from "../src/body-limits.js";
import { MODULE_LIFECYCLE_PATH } from "../src/module-lifecycle-routes.js";
import { MODULE_UI_INVENTORY_PATH } from "../src/module-ui-inventory.js";
import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
import { readyHealth } from "./support/ready-health.js";
import { createInMemoryModuleLifecycleStore } from "./support/in-memory-module-lifecycle.js";
import { moduleConfigurationOptionFor } from "./support/in-memory-module-configuration.js";
import { moduleStorageOptionFor } from "./support/in-memory-module-storage.js";

const trustedOrigin = "https://dashboard.example.test";
const untrustedOrigin = "https://evil.example.test";
const viewerId = parseEkklesiaUserId("44444444-4444-4444-8444-444444444444");

const temporaryDirectories: string[] = [];

afterEach(async () => {
  await Promise.all(
    temporaryDirectories
      .splice(0)
      .map((directory) => rm(directory, { force: true, recursive: true })),
  );
});

interface ModuleFixture {
  readonly id: string;
  readonly dependencies?: Record<string, unknown>;
}

async function createModule(modulesDirectory: string, fixture: ModuleFixture): Promise<void> {
  const moduleDirectory = path.join(modulesDirectory, fixture.id);
  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
  await mkdir(path.join(moduleDirectory, "dist/ui"), { recursive: true });
  await Promise.all([
    writeFile(
      path.join(moduleDirectory, "package.json"),
      JSON.stringify({
        ekklesia: { layer: "module" },
        name: `@test/module-${fixture.id}`,
        type: "module",
        version: "1.0.0",
      }),
    ),
    writeFile(
      path.join(moduleDirectory, "ekklesia.module.json"),
      JSON.stringify({
        compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
        ...(fixture.dependencies ? { dependencies: fixture.dependencies } : {}),
        entrypoints: { server: "./dist/server/index.js", ui: "./dist/ui/index.js" },
        id: fixture.id,
        manifestVersion: 7,
        name: `${fixture.id} module`,
        version: "1.0.0",
      }),
    ),
    writeFile(
      path.join(moduleDirectory, "dist/server/index.js"),
      `export default { id: ${JSON.stringify(fixture.id)}, version: "1.0.0" };`,
    ),
    writeFile(
      path.join(moduleDirectory, "dist/ui/index.js"),
      `export default { id: ${JSON.stringify(fixture.id)}, version: "1.0.0", mount() {} };\n`,
    ),
  ]);
}

const defaultFixtures: readonly ModuleFixture[] = [
  { id: "storage" },
  { id: "announcements", dependencies: { modules: { required: { storage: "^1.0.0" } } } },
];

interface InstallOptions {
  readonly fixtures?: readonly ModuleFixture[];
  readonly principal?: EkklesiaPrincipal;
  readonly platformOwner?: boolean;
  readonly bootDisabled?: readonly string[];
  readonly store?: ModuleLifecycleStore;
  /** Permissions this principal actually holds through a grant, evaluated by Core's real evaluator
   * — never a bypass, so a delegated holder is exercised the same way a real one would be. */
  readonly grants?: readonly string[];
}

interface Installation {
  readonly app: Hono;
  readonly modules: readonly DiscoveredModule[];
  readonly store: ModuleLifecycleStore;
}

/**
 * Composes the real application over a real discovered inventory, reproducing `startApi`'s own
 * composition: resolve eligibility from the stored configuration, then build the UI publication
 * registry and the boot snapshot from the **eligible** list rather than the discovered one. Doing it
 * the same way here is what makes these assertions evidence about production composition rather than
 * about a bespoke test wiring.
 */
async function install(options: InstallOptions = {}): Promise<Installation> {
  const modulesDirectory = await mkdtemp(path.join(tmpdir(), "ekklesia-module-lifecycle-"));
  temporaryDirectories.push(modulesDirectory);
  for (const fixture of options.fixtures ?? defaultFixtures) {
    await createModule(modulesDirectory, fixture);
  }
  const modules = await discoverModules({
    moduleSdkVersion: "0.1.0",
    modulesDirectory,
    platformVersion: "0.1.0",
  });

  const store =
    options.store ??
    createInMemoryModuleLifecycleStore(
      (options.bootDisabled ?? []).map((moduleId) => ({ enabled: false, moduleId })),
    );
  const bootConfiguration = await store.readConfiguration();
  const eligibility = resolveModuleEligibility(modules, bootConfiguration);

  const held = new Set(options.grants ?? []);
  const evaluator = createAuthorizationEvaluator({
    grants: { hasActiveGrant: async (query) => held.has(String(query.permission)) },
    platformOwners: { isPlatformOwner: async () => options.platformOwner === true },
  });
  const runtime: EkklesiaIdentityRuntime = {
    handleAuthRequest: vi.fn().mockResolvedValue(new Response(null, { status: 200 })),
    resolvePrincipal: vi.fn().mockResolvedValue(options.principal ?? ANONYMOUS_PRINCIPAL),
  };
  const authorizationStore = {
    createGrant: vi.fn(),
    grantPlatformOwner: vi.fn(),
    hasActiveGrant: vi.fn().mockResolvedValue(false),
    isPlatformOwner: vi.fn().mockResolvedValue(false),
    listGrantsForUser: vi.fn().mockResolvedValue({ grants: [] }),
    revokeGrant: vi.fn(),
    revokePlatformOwner: vi.fn(),
  } as unknown as AuthorizationStore;

  const app = createApiApp({
    authorization: {
      evaluator,
      // Permission composition still runs over the whole discovered inventory, unchanged: a
      // disabled module's permissions stay registered and grantable, and nothing enforces them
      // because it mounts no routes.
      registry: composePlatformPermissionRegistry(modules),
      store: authorizationStore,
    },
    dashboard: createInMemoryDashboardStore(),
    health: readyHealth(),
    moduleConfiguration: moduleConfigurationOptionFor(modules),
    moduleStorage: moduleStorageOptionFor(modules),
    moduleLifecycle: {
      snapshot: {
        discoveredModules: modules,
        eligibility: eligibility.entries,
        startedModuleIds: eligibility.eligibleModules.map((module) => module.manifest.id),
      },
      store,
    },
    moduleRoutes: Object.freeze([]),
    moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
    moduleServices: Object.freeze({
      database: Object.freeze({}) as unknown as ModuleDatabase,
    }) as ModuleRuntimeServices,
    moduleUi: createModuleUiPublicationRegistry(eligibility.eligibleModules),
    runtime,
    trustedOrigins: [trustedOrigin],
  });

  return { app, modules, store };
}

function owner(): InstallOptions {
  return { platformOwner: true, principal: createAuthenticatedPrincipal(viewerId) };
}

interface LifecycleEntry {
  readonly id: string;
  readonly version: string;
  readonly configured: { readonly enabled: boolean; readonly explicit: boolean };
  readonly runtime: {
    readonly state: string;
    readonly reason?: string;
    readonly dependency?: { readonly kind: string; readonly moduleId: string };
  };
  readonly restartRequired: boolean;
}

async function readLifecycle(app: Hono): Promise<readonly LifecycleEntry[]> {
  const response = await app.request(MODULE_LIFECYCLE_PATH, {
    headers: { origin: trustedOrigin },
  });
  expect(response.status).toBe(200);
  const body = (await response.json()) as { readonly modules: readonly LifecycleEntry[] };
  return body.modules;
}

function setEnabled(app: Hono, moduleId: string, enabled: boolean, origin = trustedOrigin) {
  return app.request(`${MODULE_LIFECYCLE_PATH}/${moduleId}/enabled`, {
    body: JSON.stringify({ enabled }),
    headers: { "content-type": "application/json", origin },
    method: "PUT",
  });
}

describe("GET /api/v1/module-lifecycle", () => {
  it("reports every discovered module with both axes separated", async () => {
    const { app } = await install(owner());

    expect(await readLifecycle(app)).toEqual([
      {
        configured: { enabled: true, explicit: false },
        id: "storage",
        restartRequired: false,
        runtime: { state: "running" },
        version: "1.0.0",
      },
      {
        configured: { enabled: true, explicit: false },
        id: "announcements",
        restartRequired: false,
        runtime: { state: "running" },
        version: "1.0.0",
      },
    ]);
  });

  it("explains a disabled module and the dependent it blocks, with a structured reason", async () => {
    const { app } = await install({ ...owner(), bootDisabled: ["storage"] });

    expect(await readLifecycle(app)).toEqual([
      {
        configured: { enabled: false, explicit: true },
        id: "storage",
        restartRequired: false,
        runtime: { state: "disabled" },
        version: "1.0.0",
      },
      {
        configured: { enabled: true, explicit: false },
        id: "announcements",
        restartRequired: false,
        runtime: {
          dependency: { kind: "module", moduleId: "storage" },
          reason: "required_dependency_disabled",
          state: "blocked",
        },
        version: "1.0.0",
      },
    ]);
  });

  it("is not cached and varies on origin and cookie", async () => {
    const { app } = await install(owner());
    const response = await app.request(MODULE_LIFECYCLE_PATH, {
      headers: { origin: trustedOrigin },
    });

    expect(response.headers.get("Cache-Control")).toBe("no-store");
    expect(response.headers.get("Vary")).toContain("Cookie");
  });

  it("refuses an anonymous caller", async () => {
    const { app } = await install();
    const response = await app.request(MODULE_LIFECYCLE_PATH);

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "AUTHORIZATION_DENIED" });
  });

  it("refuses an ordinary authenticated user who holds no lifecycle permission", async () => {
    // The same principal that `core.modules.ui.read` (baseline `authenticated`) would admit: this
    // resource is deliberately restricted, because it is the only place a disabled module is
    // visible at all.
    const { app } = await install({ principal: createAuthenticatedPrincipal(viewerId) });
    const inventory = await app.request(MODULE_UI_INVENTORY_PATH);
    const lifecycle = await app.request(MODULE_LIFECYCLE_PATH);

    expect(inventory.status).toBe(200);
    expect(lifecycle.status).toBe(403);
  });

  it("admits a non-owner holding exactly core.modules.lifecycle.manage through a real grant", async () => {
    const { app } = await install({
      grants: [String(CORE_MODULES_LIFECYCLE_MANAGE)],
      principal: createAuthenticatedPrincipal(viewerId),
    });

    expect((await app.request(MODULE_LIFECYCLE_PATH)).status).toBe(200);
    // Holding it confers no module authority: the Dashboard's own manage permission is untouched by
    // this grant, so a lifecycle administrator cannot reorganize navigation.
    const reorganize = await app.request(`${DASHBOARD_NAVIGATION_PATH}/groups/media`, {
      body: JSON.stringify({ label: "Media", order: 10 }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "PUT",
    });
    expect(reorganize.status).toBe(403);
  });

  it("reports a sanitized 503 when the configuration cannot be read, never a driver detail", async () => {
    const failing: ModuleLifecycleStore = {
      readConfiguration: async () => {
        throw new ModuleLifecycleStoreError("MODULE_LIFECYCLE_READ_FAILED");
      },
      setEnabled: async () => {
        throw new ModuleLifecycleStoreError("MODULE_LIFECYCLE_WRITE_FAILED");
      },
    };
    // Boot with a working store, then swap in the failing one for the request path only.
    const { app } = await install({ ...owner(), store: failingAfterBoot(failing) });
    const response = await app.request(MODULE_LIFECYCLE_PATH, {
      headers: { origin: trustedOrigin },
    });

    expect(response.status).toBe(503);
    expect(await response.json()).toEqual({ code: "MODULE_LIFECYCLE_READ_FAILED" });
  });
});

/** Answers the one boot-time read with an empty configuration, then fails every later call — so a
 * request-path failure can be exercised without making startup composition itself impossible. */
function failingAfterBoot(failing: ModuleLifecycleStore): ModuleLifecycleStore {
  let bootRead = false;
  return {
    async readConfiguration() {
      if (!bootRead) {
        bootRead = true;
        return { modules: [] };
      }
      return failing.readConfiguration();
    },
    setEnabled: (input) => failing.setEnabled(input),
  };
}

describe("PUT /api/v1/module-lifecycle/:moduleId/enabled", () => {
  it("persists a decision and reports honestly that the running process has not changed", async () => {
    const { app } = await install(owner());

    const response = await setEnabled(app, "announcements", false);

    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({
      configured: { enabled: false, explicit: true },
      id: "announcements",
      // Not `disabled`: this process is still serving that module. Claiming otherwise would be a
      // lie about a module that is still running.
      restartRequired: true,
      runtime: { state: "running" },
      version: "1.0.0",
    });
  });

  it("marks the dependents of a newly disabled module as restart-pending too", async () => {
    const { app } = await install(owner());

    await setEnabled(app, "storage", false);

    expect((await readLifecycle(app)).map((entry) => [entry.id, entry.restartRequired])).toEqual([
      ["storage", true],
      ["announcements", true],
    ]);
  });

  it("is idempotent, and re-enabling clears the pending restart", async () => {
    const { app } = await install(owner());

    await setEnabled(app, "announcements", false);
    await setEnabled(app, "announcements", false);
    const reEnabled = await setEnabled(app, "announcements", true);

    expect(await reEnabled.json()).toEqual({
      configured: { enabled: true, explicit: true },
      id: "announcements",
      restartRequired: false,
      runtime: { state: "running" },
      version: "1.0.0",
    });
  });

  it("refuses a module this process cannot see, rather than storing an unverifiable record", async () => {
    const { app, store } = await install(owner());

    const response = await setEnabled(app, "not-installed", false);

    expect(response.status).toBe(404);
    expect(await response.json()).toEqual({ code: "MODULE_NOT_INSTALLED" });
    expect((await store.readConfiguration()).modules).toEqual([]);
  });

  it("refuses a malformed module identifier without reaching the store", async () => {
    const { app, store } = await install(owner());

    const response = await setEnabled(app, "Not%20A%20Module", false);

    expect(response.status).toBe(404);
    expect((await store.readConfiguration()).modules).toEqual([]);
  });

  it("rejects an untrusted origin before authorization or the store runs", async () => {
    const { app, store } = await install(owner());

    const response = await setEnabled(app, "announcements", false, untrustedOrigin);

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "UNTRUSTED_ORIGIN" });
    expect((await store.readConfiguration()).modules).toEqual([]);
  });

  it("rejects a missing origin", async () => {
    const { app } = await install(owner());
    const response = await app.request(`${MODULE_LIFECYCLE_PATH}/announcements/enabled`, {
      body: JSON.stringify({ enabled: false }),
      headers: { "content-type": "application/json" },
      method: "PUT",
    });

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "UNTRUSTED_ORIGIN" });
  });

  it("refuses an authenticated caller without the restricted permission", async () => {
    const { app, store } = await install({ principal: createAuthenticatedPrincipal(viewerId) });

    const response = await setEnabled(app, "announcements", false);

    expect(response.status).toBe(403);
    expect((await store.readConfiguration()).modules).toEqual([]);
  });

  it.each([
    ["a non-boolean value", { enabled: "false" }],
    ["a missing field", {}],
    ["an unexpected key alongside a valid one", { enabled: false, force: true }],
    ["an array", []],
    ["a bare string", "disabled"],
  ])("rejects %s with a closed, structured validation failure", async (_label, body) => {
    const { app, store } = await install(owner());
    const response = await app.request(`${MODULE_LIFECYCLE_PATH}/announcements/enabled`, {
      body: JSON.stringify(body),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "PUT",
    });

    expect(response.status).toBe(400);
    expect(await response.json()).toEqual({ code: "INVALID_REQUEST" });
    expect((await store.readConfiguration()).modules).toEqual([]);
  });

  it("enforces the platform body limit with the one sanitized 413 contract", async () => {
    const { app } = await install(owner());
    const oversized = JSON.stringify({ enabled: "x".repeat(CORE_MUTATION_MAX_BODY_BYTES + 1024) });
    const response = await app.request(`${MODULE_LIFECYCLE_PATH}/announcements/enabled`, {
      body: oversized,
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "PUT",
    });

    expect(response.status).toBe(413);
    expect(await response.json()).toEqual({ code: "REQUEST_BODY_TOO_LARGE" });
  });

  it("never leaks a filesystem path, package name, or manifest path through either verb", async () => {
    const { app } = await install(owner());
    const listed = await (
      await app.request(MODULE_LIFECYCLE_PATH, { headers: { origin: trustedOrigin } })
    ).text();
    const mutated = await (await setEnabled(app, "announcements", false)).text();

    for (const payload of [listed, mutated]) {
      expect(payload).not.toContain("/tmp");
      expect(payload).not.toContain("@test/module-");
      expect(payload).not.toContain("ekklesia.module.json");
      expect(payload).not.toContain("dist/");
      expect(payload).not.toContain("entrypoint");
    }
  });
});

describe("lifecycle state governs module UI exposure", () => {
  it("keeps a disabled module out of the mountable inventory and out of Dashboard navigation", async () => {
    const { app } = await install({
      bootDisabled: ["announcements"],
      platformOwner: true,
      principal: createAuthenticatedPrincipal(viewerId),
    });

    const inventory = (await (await app.request(MODULE_UI_INVENTORY_PATH)).json()) as {
      readonly modules: readonly { readonly id: string }[];
    };
    const navigation = (await (await app.request(DASHBOARD_NAVIGATION_PATH)).json()) as {
      readonly groups: readonly { readonly modules: readonly { readonly name: string }[] }[];
      readonly ungrouped: readonly { readonly module: { readonly id: string } }[];
    };

    // Discovered, validated, and declaring a real compiled UI artifact — and still absent, because
    // publication is built from the eligible set rather than the discovered one.
    expect(inventory.modules.map((entry) => entry.id)).toEqual(["storage"]);
    expect(navigation.ungrouped.map((entry) => entry.module.id)).toEqual(["storage"]);
    expect(navigation.groups).toEqual([]);
  });

  it("keeps a dependency-blocked module out of both, exactly like an explicitly disabled one", async () => {
    const { app } = await install({
      bootDisabled: ["storage"],
      platformOwner: true,
      principal: createAuthenticatedPrincipal(viewerId),
    });

    const inventory = (await (await app.request(MODULE_UI_INVENTORY_PATH)).json()) as {
      readonly modules: readonly { readonly id: string }[];
    };

    expect(inventory.modules).toEqual([]);
  });

  it("does not remove a module from navigation merely because a restart is pending", async () => {
    const { app } = await install({
      platformOwner: true,
      principal: createAuthenticatedPrincipal(viewerId),
    });

    await setEnabled(app, "announcements", false);
    const inventory = (await (await app.request(MODULE_UI_INVENTORY_PATH)).json()) as {
      readonly modules: readonly { readonly id: string }[];
    };

    // The module really is still mounted and still serving; hiding its UI now would break a viewer
    // mid-session for a change that has not taken effect. `restartRequired` is where that pending
    // change is reported.
    expect(inventory.modules.map((entry) => entry.id)).toEqual(["storage", "announcements"]);
  });
});

describe("the lifecycle prefix is a sibling of the module route namespace", () => {
  it("does not sit under /api/v1/modules/, where an installed module could collide with it", async () => {
    // `moduleRoutePathSchema` accepts `enabled` as an ordinary static segment, so a module named
    // `announcements` may legitimately register `PUT /enabled` — mounted at exactly
    // `/api/v1/modules/announcements/enabled`. If the platform published its lifecycle mutation
    // there, registration order would decide which one answers.
    expect(MODULE_LIFECYCLE_PATH.startsWith("/api/v1/modules/")).toBe(false);
    expect(MODULE_LIFECYCLE_PATH).toBe("/api/v1/module-lifecycle");

    const { app } = await install(owner());
    const collision = await app.request("/api/v1/modules/announcements/enabled", {
      body: JSON.stringify({ enabled: false }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "PUT",
    });

    expect(collision.status).toBe(404);
    expect(await collision.json()).toEqual({ code: "NOT_FOUND" });
  });
});