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,
  createAuthorizationEvaluator,
  type PermissionRegistry,
} from "@ekklesia/core/authorization";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import {
  composePlatformPermissionRegistry,
  createModuleUiPublicationRegistry,
  type DiscoveredModule,
  discoverModules,
} from "@ekklesia/core/modules";
import type { Hono } from "hono";
import { afterEach, describe, expect, it, vi } from "vitest";
import { createApiApp } from "../src/app.js";
import { moduleApiBaseUrl } from "../src/module-http-routes.js";
import { MODULE_UI_INVENTORY_PATH } from "../src/module-ui-inventory.js";
import { moduleUiArtifactUrl } from "../src/module-ui-routes.js";

const trustedOrigin = "https://dashboard.example.test";
const viewerId = parseEkklesiaUserId("11111111-1111-4111-8111-111111111111");

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 version?: string;
  /** Omit for a backend-only module: the manifest then declares no `entrypoints.ui` at all. */
  readonly withUi?: boolean;
  readonly permissions?: ReadonlyArray<{
    readonly id: string;
    readonly baseline: "authenticated" | "public" | "restricted";
  }>;
}

async function createModule(modulesDirectory: string, fixture: ModuleFixture): Promise<void> {
  const version = fixture.version ?? "0.1.0";
  const moduleDirectory = path.join(modulesDirectory, fixture.id);
  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
  await writeFile(
    path.join(moduleDirectory, "package.json"),
    JSON.stringify({
      ekklesia: { layer: "module" },
      name: `@test/module-${fixture.id}`,
      type: "module",
      version,
    }),
  );
  await writeFile(
    path.join(moduleDirectory, "ekklesia.module.json"),
    JSON.stringify({
      compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
      entrypoints: {
        server: "./dist/server/index.js",
        ...(fixture.withUi ? { ui: "./dist/ui/index.js" } : {}),
      },
      id: fixture.id,
      manifestVersion: 4,
      name: `${fixture.id} module`,
      permissions: (fixture.permissions ?? []).map((permission) => ({
        ...permission,
        description: `Test permission for ${fixture.id}.`,
      })),
      version,
    }),
  );
  await writeFile(
    path.join(moduleDirectory, "dist/server/index.js"),
    `export default { id: ${JSON.stringify(fixture.id)}, version: ${JSON.stringify(version)} };`,
  );
  if (fixture.withUi) {
    await mkdir(path.join(moduleDirectory, "dist/ui"), { recursive: true });
    await writeFile(
      path.join(moduleDirectory, "dist/ui/index.js"),
      `export default { id: ${JSON.stringify(fixture.id)}, version: ${JSON.stringify(version)}, mount() {} };\n`,
    );
  }
}

interface InstallOptions {
  readonly fixtures: readonly ModuleFixture[];
  /** Anonymous by default, so every scenario has to opt in to being signed in. */
  readonly principal?: EkklesiaPrincipal;
  /** Permission ids the viewer holds an active grant for. Evaluated by Core's real evaluator, so
   * baselines, the owner bypass, and deny-by-default all behave exactly as in production. */
  readonly grants?: readonly string[];
  readonly platformOwner?: boolean;
  /** Makes the grant port fail, so the "a hint that could not be determined is never reported as
   * denied" path can be exercised. */
  readonly grantsUnavailable?: boolean;
}

interface Installation {
  readonly app: Hono;
  readonly modules: readonly DiscoveredModule[];
  readonly modulesDirectory: string;
  readonly permissionRegistry: PermissionRegistry;
}

/** A real installation: fixtures on disk, Core's real discovery, real permission composition, the
 * real publication registry, the real authorization evaluator, and the real `createApiApp`. Only
 * identity resolution and the two authorization ports are doubled, because neither needs PostgreSQL
 * to answer the questions these tests ask. */
async function install(options: InstallOptions): Promise<Installation> {
  const modulesDirectory = await mkdtemp(path.join(tmpdir(), "ekklesia-api-ui-inventory-"));
  temporaryDirectories.push(modulesDirectory);
  for (const fixture of options.fixtures) {
    await createModule(modulesDirectory, fixture);
  }
  const modules = await discoverModules({
    moduleSdkVersion: "0.1.0",
    modulesDirectory,
    platformVersion: "0.1.0",
  });

  const granted = new Set(options.grants ?? []);
  const evaluator = createAuthorizationEvaluator({
    grants: {
      hasActiveGrant: async (query) => {
        if (options.grantsUnavailable) {
          throw new Error("grant store unavailable");
        }
        return granted.has(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 store = {
    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 services: ModuleRuntimeServices = Object.freeze({
    database: Object.freeze({}) as unknown as ModuleDatabase,
  });
  const permissionRegistry = composePlatformPermissionRegistry(modules);

  const app = createApiApp({
    authorization: { evaluator, registry: permissionRegistry, store },
    moduleRoutes: Object.freeze([]),
    moduleServices: services,
    moduleUi: createModuleUiPublicationRegistry(modules),
    runtime,
    trustedOrigins: [trustedOrigin],
  });

  return { app, modules, modulesDirectory, permissionRegistry };
}

function signedIn(): EkklesiaPrincipal {
  return createAuthenticatedPrincipal(viewerId);
}

async function inventoryOf(app: Hono): Promise<{
  readonly body: string;
  readonly modules: ReadonlyArray<Record<string, unknown>>;
  readonly response: Response;
}> {
  const response = await app.request(MODULE_UI_INVENTORY_PATH);
  const body = await response.clone().text();
  const parsed = (await response.json()) as { modules?: ReadonlyArray<Record<string, unknown>> };
  return { body, modules: parsed.modules ?? [], response };
}

describe("module UI inventory — what it lists", () => {
  it("describes a publishable module with exactly the fields a host needs", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", permissions: [], withUi: true }],
      principal: signedIn(),
    });

    const { modules, response } = await inventoryOf(app);

    expect(response.status).toBe(200);
    expect(modules).toEqual([
      {
        api: { baseUrl: "/api/v1/modules/example" },
        id: "example",
        permissions: [],
        ui: { url: "/api/v1/module-ui/example/0.1.0" },
        version: "0.1.0",
      },
    ]);
  });

  it("builds both URLs with the server's own canonical helpers", async () => {
    const { app, modules: discovered } = await install({
      fixtures: [{ id: "example", version: "2.4.1", withUi: true }],
      principal: signedIn(),
    });
    const module = discovered[0] as DiscoveredModule;

    const { modules } = await inventoryOf(app);

    // Not "looks like the right shape" — byte-identical to what the helpers produce, so a second
    // hand-written template string anywhere would fail here.
    expect(modules[0]?.ui).toEqual({
      url: moduleUiArtifactUrl({ moduleId: module.manifest.id, version: module.manifest.version }),
    });
    expect(modules[0]?.api).toEqual({ baseUrl: moduleApiBaseUrl(module.manifest.id) });
  });

  it("omits a module that declares no UI entrypoint", async () => {
    const { app } = await install({
      fixtures: [{ id: "calendar" }, { id: "example", withUi: true }],
      principal: signedIn(),
    });

    const { modules } = await inventoryOf(app);

    expect(modules.map((module) => module.id)).toEqual(["example"]);
  });

  it("is empty, not an error, when no installed module provides a UI", async () => {
    const { app } = await install({ fixtures: [{ id: "calendar" }], principal: signedIn() });

    const { modules, response } = await inventoryOf(app);

    expect(response.status).toBe(200);
    expect(modules).toEqual([]);
  });

  it("orders modules deterministically, matching the publication registry", async () => {
    const { app } = await install({
      fixtures: [
        { id: "signage", withUi: true },
        { id: "announcements", withUi: true },
        { id: "calendar", withUi: true },
      ],
      principal: signedIn(),
    });

    const first = await inventoryOf(app);
    const second = await inventoryOf(app);

    // Discovery order, which is sorted; the same on every request.
    expect(first.modules.map((module) => module.id)).toEqual([
      "announcements",
      "calendar",
      "signage",
    ]);
    expect(second.modules.map((module) => module.id)).toEqual(
      first.modules.map((module) => module.id),
    );
  });

  it("leaks no filesystem path, package root, or other manifest internal", async () => {
    const {
      app,
      modules: discovered,
      modulesDirectory,
    } = await install({
      fixtures: [{ id: "example", permissions: [], withUi: true }],
      principal: signedIn(),
    });
    const artifactPath = (discovered[0] as DiscoveredModule).entrypoints.ui as string;

    const { body, modules } = await inventoryOf(app);

    expect(body).not.toContain(modulesDirectory);
    expect(body).not.toContain(artifactPath);
    expect(body).not.toContain(tmpdir());
    expect(body).not.toContain("dist");
    expect(body).not.toContain("@test/module-example");
    expect(body).not.toContain("ekklesia.module.json");
    // The exact key set, so a future field cannot be added without a deliberate decision here.
    expect(Object.keys(modules[0] ?? {}).sort()).toEqual([
      "api",
      "id",
      "permissions",
      "ui",
      "version",
    ]);
  });

  it("carries no navigation or presentation metadata", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", withUi: true }],
      principal: signedIn(),
    });

    const { body } = await inventoryOf(app);

    // ADR 0021 keeps Dashboard grouping an administrator's configuration, never a module
    // declaration. The manifest's own `name` and `description` must not leak into it by accident.
    for (const field of ["name", "description", "icon", "category", "folder", "order", "group"]) {
      expect(body, field).not.toContain(`"${field}"`);
    }
  });
});

describe("module UI inventory — authentication", () => {
  it("refuses an anonymous caller", async () => {
    const { app } = await install({ fixtures: [{ id: "example", withUi: true }] });

    const response = await app.request(MODULE_UI_INVENTORY_PATH);

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

  it("tells an anonymous caller nothing about what is installed", async () => {
    const { app } = await install({
      fixtures: [
        { id: "example", withUi: true },
        { id: "calendar", withUi: true },
      ],
    });

    const body = await (await app.request(MODULE_UI_INVENTORY_PATH)).text();

    expect(body).not.toContain("example");
    expect(body).not.toContain("calendar");
  });

  it("admits any signed-in user without needing an explicit grant", async () => {
    // `core.modules.ui.read` is baseline `authenticated`, so being signed in is enough — a shell
    // that rendered nothing until an operator granted every user a permission would be unusable.
    const { app } = await install({
      fixtures: [{ id: "example", withUi: true }],
      grants: [],
      principal: signedIn(),
      platformOwner: false,
    });

    expect((await app.request(MODULE_UI_INVENTORY_PATH)).status).toBe(200);
  });

  it("is never cached and varies on the caller's identity", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", withUi: true }],
      principal: signedIn(),
    });

    const response = await app.request(MODULE_UI_INVENTORY_PATH, {
      headers: { origin: trustedOrigin },
    });

    expect(response.headers.get("cache-control")).toBe("no-store");
    const vary = response.headers.get("vary")?.toLowerCase() ?? "";
    expect(vary).toContain("origin");
    expect(vary).toContain("cookie");
  });
});

describe("module UI inventory — permission hints", () => {
  const readPermission = { baseline: "restricted" as const, id: "example.records.read" };
  const writePermission = { baseline: "restricted" as const, id: "example.records.write" };

  it("returns only the permissions the server actually granted this principal", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", permissions: [readPermission, writePermission], withUi: true }],
      grants: ["example.records.read"],
      principal: signedIn(),
    });

    const { modules } = await inventoryOf(app);

    expect(modules[0]?.permissions).toEqual(["example.records.read"]);
  });

  it("returns none of them for a signed-in user holding no grant", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", permissions: [readPermission, writePermission], withUi: true }],
      grants: [],
      principal: signedIn(),
    });

    const { modules } = await inventoryOf(app);

    // Never a default of true, and never the module's full declared surface.
    expect(modules[0]?.permissions).toEqual([]);
  });

  it("honours a baseline that needs no grant at all", async () => {
    const { app } = await install({
      fixtures: [
        {
          id: "example",
          permissions: [{ baseline: "authenticated", id: "example.records.list" }, readPermission],
          withUi: true,
        },
      ],
      grants: [],
      principal: signedIn(),
    });

    const { modules } = await inventoryOf(app);

    expect(modules[0]?.permissions).toEqual(["example.records.list"]);
  });

  it("honours the platform-owner bypass, exactly like a real request would", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", permissions: [readPermission, writePermission], withUi: true }],
      grants: [],
      platformOwner: true,
      principal: signedIn(),
    });

    const { modules } = await inventoryOf(app);

    expect(modules[0]?.permissions).toEqual(["example.records.read", "example.records.write"]);
  });

  it("scopes hints to each module's own declared permissions", async () => {
    const { app } = await install({
      fixtures: [
        { id: "example", permissions: [readPermission], withUi: true },
        {
          id: "calendar",
          permissions: [{ baseline: "restricted", id: "calendar.events.read" }],
          withUi: true,
        },
      ],
      grants: ["example.records.read", "calendar.events.read"],
      principal: signedIn(),
    });

    const { modules } = await inventoryOf(app);

    const byId = new Map(modules.map((module) => [module.id, module.permissions]));
    // Neither module learns anything about the other's authorization state, and neither is told
    // about Core's own permissions.
    expect(byId.get("example")).toEqual(["example.records.read"]);
    expect(byId.get("calendar")).toEqual(["calendar.events.read"]);
    expect(JSON.stringify(modules)).not.toContain("core.authorization.grants.manage");
    expect(JSON.stringify(modules)).not.toContain("core.modules.ui.read");
  });

  it("reports an evaluation outage as unavailable rather than as 'nothing granted'", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", permissions: [readPermission], withUi: true }],
      grantsUnavailable: true,
      principal: signedIn(),
    });

    const response = await app.request(MODULE_UI_INVENTORY_PATH);

    // A hint that silently read "denied" during an outage would blank the UI and look like a
    // permissions problem.
    expect(response.status).toBe(503);
    expect(await response.json()).toEqual({ code: "AUTHORIZATION_EVALUATION_FAILED" });
  });
});

describe("module UI inventory — it is not a module management API", () => {
  it("routes no method other than GET", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", withUi: true }],
      principal: signedIn(),
    });

    for (const method of ["POST", "PUT", "PATCH", "DELETE"]) {
      const response = await app.request(MODULE_UI_INVENTORY_PATH, { method });
      expect(response.status, method).toBe(404);
      expect(await response.json(), method).toEqual({ code: "NOT_FOUND" });
    }
  });

  it("still refuses to serve an artifact under the collection path", async () => {
    const { app } = await install({
      fixtures: [{ id: "example", withUi: true }],
      principal: signedIn(),
    });

    for (const suffix of ["/example", "/example/", "/example/0.1.0/index.js"]) {
      const response = await app.request(`${MODULE_UI_INVENTORY_PATH}${suffix}`);
      expect(response.status, suffix).toBe(404);
    }
  });
});