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 AuthorizationEvaluator,
  type AuthorizationStore,
  createAuthorizationEvaluator,
} from "@ekklesia/core/authorization";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import {
  composePlatformPermissionRegistry,
  createModuleUiPublicationRegistry,
  type DiscoveredModule,
  discoverModules,
  EMPTY_MODULE_REALTIME_REGISTRY,
} from "@ekklesia/core/modules";
import type { Hono } from "hono";
import { afterEach, describe, expect, it, vi } from "vitest";
import { createApiApp } from "../src/app.js";
import { createDisplayHostAssets, type DisplayHostAssets } from "../src/display-host-assets.js";
import {
  DISPLAY_HOST_SCRIPT_PATH,
  ModuleDisplayConfigurationError,
  moduleDisplayDescriptorUrl,
  moduleDisplayPageUrl,
} from "../src/module-display-routes.js";
import { moduleApiBaseUrl } from "../src/module-http-routes.js";
import { moduleRealtimeBaseUrl } from "../src/module-realtime-routes.js";
import { MODULE_UI_INVENTORY_PATH } from "../src/module-ui-inventory.js";
import { moduleDisplayUiArtifactUrl } from "../src/module-ui-routes.js";
import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
import { moduleConfigurationOptionFor } from "./support/in-memory-module-configuration.js";
import {
  createInMemoryModuleLifecycleStore,
  moduleLifecycleSnapshotFor,
} from "./support/in-memory-module-lifecycle.js";
import { moduleStorageOptionFor } from "./support/in-memory-module-storage.js";

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

const displayHostAssets: DisplayHostAssets = createDisplayHostAssets(
  `<!doctype html><html><body><div id="ekklesia-display"></div><script type="module" src="${DISPLAY_HOST_SCRIPT_PATH}"></script></body></html>`,
  "globalThis.__ekklesiaDisplayHostLoaded = true;\n",
);

const temporaryDirectories: string[] = [];

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

interface ModuleFixture {
  readonly display?: boolean;
  readonly id?: string;
  readonly ui?: boolean;
  readonly version?: string;
}

async function createModule(modulesDirectory: string, fixture: ModuleFixture = {}): Promise<void> {
  const id = fixture.id ?? "announcements";
  const version = fixture.version ?? "1.4.2";
  const moduleDirectory = path.join(modulesDirectory, 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-${id}`,
      type: "module",
      version,
    }),
  );
  await writeFile(
    path.join(moduleDirectory, "ekklesia.module.json"),
    JSON.stringify({
      compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
      entrypoints: {
        server: "./dist/server/index.js",
        ...(fixture.ui ? { ui: "./dist/ui/index.js" } : {}),
        ...(fixture.display
          ? {
              display: {
                artifact: "./dist/display/index.js",
                permission: `${id}.display.view`,
              },
            }
          : {}),
      },
      id,
      manifestVersion: 6,
      name: `${id} module`,
      permissions: fixture.display
        ? [
            {
              baseline: "restricted",
              description: `View the ${id} display.`,
              id: `${id}.display.view`,
            },
          ]
        : [],
      version,
    }),
  );
  await writeFile(
    path.join(moduleDirectory, "dist/server/index.js"),
    `export default { id: ${JSON.stringify(id)}, version: ${JSON.stringify(version)} };\n`,
  );
  if (fixture.ui) {
    await mkdir(path.join(moduleDirectory, "dist/ui"), { recursive: true });
    await writeFile(
      path.join(moduleDirectory, "dist/ui/index.js"),
      `export default { id: ${JSON.stringify(id)}, version: ${JSON.stringify(version)}, mount() {} };\n`,
    );
  }
  if (fixture.display) {
    await mkdir(path.join(moduleDirectory, "dist/display"), { recursive: true });
    await writeFile(
      path.join(moduleDirectory, "dist/display/index.js"),
      `export default { id: ${JSON.stringify(id)}, version: ${JSON.stringify(version)}, mount(container, context) { container.textContent = context.moduleId + ":slideshow"; } };\n`,
    );
  }
}

interface InstallOptions extends ModuleFixture {
  readonly assets?: DisplayHostAssets;
  readonly evaluator?: AuthorizationEvaluator;
  readonly granted?: readonly string[];
  readonly principal?: EkklesiaPrincipal;
  /** The API builds publication from the eligible/running set. `false` models a module that was
   * discovered but disabled or dependency-blocked before runtime startup. */
  readonly published?: boolean;
  readonly withAssets?: boolean;
}

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

function fakeServices(): ModuleRuntimeServices {
  return Object.freeze({ database: Object.freeze({}) as unknown as ModuleDatabase });
}

function fakeAuthorizationStore(): AuthorizationStore {
  return {
    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;
}

async function install(options: InstallOptions): Promise<Installation> {
  const modulesDirectory = await mkdtemp(path.join(tmpdir(), "ekklesia-api-display-"));
  temporaryDirectories.push(modulesDirectory);
  await createModule(modulesDirectory, options);
  const modules = await discoverModules({
    moduleSdkVersion: "0.1.0",
    modulesDirectory,
    platformVersion: "0.1.0",
  });
  const granted = new Set(options.granted ?? []);
  const evaluator =
    options.evaluator ??
    createAuthorizationEvaluator({
      grants: { hasActiveGrant: async (query) => granted.has(query.permission) },
      platformOwners: { isPlatformOwner: async () => false },
    });
  const runtime: EkklesiaIdentityRuntime = {
    handleAuthRequest: vi.fn().mockResolvedValue(new Response(null, { status: 200 })),
    resolvePrincipal: vi.fn().mockResolvedValue(options.principal ?? ANONYMOUS_PRINCIPAL),
  };
  const publishedModules = options.published === false ? [] : modules;
  const moduleUi = createModuleUiPublicationRegistry(publishedModules);
  const app = createApiApp({
    authorization: {
      evaluator,
      registry: composePlatformPermissionRegistry(modules),
      store: fakeAuthorizationStore(),
    },
    dashboard: createInMemoryDashboardStore(),
    ...(moduleUi.listDisplays().length > 0 && options.withAssets !== false
      ? { displayHostAssets: options.assets ?? displayHostAssets }
      : {}),
    moduleConfiguration: moduleConfigurationOptionFor(modules),
    moduleLifecycle: {
      snapshot: moduleLifecycleSnapshotFor(modules),
      store: createInMemoryModuleLifecycleStore(),
    },
    moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
    moduleRoutes: Object.freeze([]),
    moduleServices: fakeServices(),
    moduleStorage: moduleStorageOptionFor(modules),
    moduleUi,
    runtime,
    trustedOrigins: [trustedOrigin],
  });
  return { app, modules };
}

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

describe("module display routes — authorization and descriptor", () => {
  it("gives an unpaired viewer the inert shell but never the descriptor", async () => {
    const { app } = await install({ display: true });

    const [page, descriptor] = await Promise.all([
      app.request(moduleDisplayPageUrl("announcements")),
      app.request(moduleDisplayDescriptorUrl("announcements")),
    ]);

    // The page is deliberately open: a television nobody has paired has no identity to present, and
    // a 403 here would leave it nowhere to show a pairing code (ADR 0036). It carries nothing —
    // the same module-agnostic bytes every display gets, with no module id and no data.
    expect(page.status).toBe(200);
    expect(await page.text()).toBe(displayHostAssets.html);

    // Authorization is entirely in the descriptor, and it has not moved.
    expect(descriptor.status).toBe(403);
    expect(descriptor.headers.get("cache-control")).toBe("no-store");
    expect(await descriptor.json()).toEqual({ code: "AUTHORIZATION_DENIED" });
  });

  it("requires the declared display permission, not merely an authenticated principal", async () => {
    const { app } = await install({ display: true, principal: signedIn() });

    // Being signed in is not being permitted, and the descriptor is where that is decided.
    expect((await app.request(moduleDisplayDescriptorUrl("announcements"))).status).toBe(403);
  });

  it("serves the stable shell and current versioned descriptor to a permitted principal", async () => {
    const { app } = await install({
      display: true,
      granted: [displayPermission],
      principal: signedIn(),
      version: "1.4.2",
    });

    const page = await app.request(moduleDisplayPageUrl("announcements"));
    const descriptor = await app.request(moduleDisplayDescriptorUrl("announcements"));

    expect(page.status).toBe(200);
    expect(page.headers.get("content-type")).toBe("text/html; charset=utf-8");
    expect(page.headers.get("cache-control")).toBe("no-store");
    expect(page.headers.get("x-content-type-options")).toBe("nosniff");
    expect(await page.text()).toBe(displayHostAssets.html);
    expect(await descriptor.json()).toEqual({
      viewer: { kind: "authenticated", userId: viewerId },
      module: {
        api: { baseUrl: moduleApiBaseUrl("announcements") },
        display: {
          url: moduleDisplayUiArtifactUrl({ moduleId: "announcements", version: "1.4.2" }),
        },
        id: "announcements",
        permissions: [displayPermission],
        realtime: { baseUrl: moduleRealtimeBaseUrl("announcements") },
        version: "1.4.2",
      },
    });
    expect(descriptor.headers.get("cache-control")).toBe("no-store");
    expect(descriptor.headers.get("content-type")).toContain("application/json");
    expect(descriptor.headers.get("vary")).toContain("Origin");
    expect(descriptor.headers.get("vary")).toContain("Cookie");
  });

  it("sanitizes a permission-hint evaluation failure after route authorization succeeds", async () => {
    const authorize = vi
      .fn()
      .mockResolvedValueOnce({ allowed: true })
      .mockRejectedValueOnce(new Error("postgresql://secret@127.0.0.1 /srv/modules/announcements"));
    const evaluator: AuthorizationEvaluator = { authorize };
    const { app } = await install({ display: true, evaluator, principal: signedIn() });

    const response = await app.request(moduleDisplayDescriptorUrl("announcements"));
    const body = await response.text();

    expect(authorize).toHaveBeenCalledTimes(2);
    expect(response.status).toBe(503);
    expect(JSON.parse(body)).toEqual({ code: "AUTHORIZATION_EVALUATION_FAILED" });
    expect(response.headers.get("cache-control")).toBe("no-store");
    expect(response.headers.get("vary")).toContain("Origin");
    expect(response.headers.get("vary")).toContain("Cookie");
    for (const secret of ["postgresql", "127.0.0.1", "/srv/", "announcements"]) {
      expect(body).not.toContain(secret);
    }
  });

  it("keeps the outer page stable when the internal artifact version changes", () => {
    expect(moduleDisplayPageUrl("announcements")).toBe("/display/announcements");
    expect(moduleDisplayUiArtifactUrl({ moduleId: "announcements", version: "1.0.0" })).not.toBe(
      moduleDisplayUiArtifactUrl({ moduleId: "announcements", version: "2.0.0" }),
    );
  });
});

describe("module display routes — role and lifecycle separation", () => {
  it("keeps a display-only module out of the primary UI inventory", async () => {
    const { app } = await install({
      display: true,
      granted: [displayPermission],
      principal: signedIn(),
    });

    expect((await app.request(moduleDisplayPageUrl("announcements"))).status).toBe(200);
    const inventory = await app.request(MODULE_UI_INVENTORY_PATH);
    expect(inventory.status).toBe(200);
    expect(await inventory.json()).toEqual({ modules: [] });
  });

  it("does not give a dashboard-only module a display route", async () => {
    const { app } = await install({ principal: signedIn(), ui: true });

    expect((await app.request(moduleDisplayPageUrl("announcements"))).status).toBe(404);
    const inventory = await app.request(MODULE_UI_INVENTORY_PATH);
    expect(inventory.status).toBe(200);
    expect((await inventory.json()) as { modules: unknown[] }).toMatchObject({
      modules: [{ id: "announcements" }],
    });
  });

  it("publishes both roles independently when a module declares both", async () => {
    const { app } = await install({
      display: true,
      granted: [displayPermission],
      principal: signedIn(),
      ui: true,
    });

    expect((await app.request(moduleDisplayPageUrl("announcements"))).status).toBe(200);
    expect((await app.request(MODULE_UI_INVENTORY_PATH)).status).toBe(200);
    expect(
      ((await (await app.request(MODULE_UI_INVENTORY_PATH)).json()) as { modules: unknown[] })
        .modules,
    ).toHaveLength(1);
  });

  it("has no display page, descriptor, or artifact when the module is outside the eligible set", async () => {
    const { app } = await install({
      display: true,
      granted: [displayPermission],
      principal: signedIn(),
      published: false,
    });

    expect((await app.request(moduleDisplayPageUrl("announcements"))).status).toBe(404);
    expect((await app.request(moduleDisplayDescriptorUrl("announcements"))).status).toBe(404);
    expect(
      (
        await app.request(
          moduleDisplayUiArtifactUrl({ moduleId: "announcements", version: "1.4.2" }),
        )
      ).status,
    ).toBe(404);
    expect((await app.request(DISPLAY_HOST_SCRIPT_PATH)).status).toBe(404);
  });

  it("registers only the exact stable page and descriptor paths", async () => {
    const { app } = await install({
      display: true,
      granted: [displayPermission],
      principal: signedIn(),
    });

    for (const route of [
      "/display",
      "/display/announcements/",
      "/display/announcements/settings",
      "/api/v1/module-displays",
      "/api/v1/module-displays/announcements/",
      "/api/v1/module-displays/announcements/settings",
    ]) {
      expect((await app.request(route)).status, route).toBe(404);
    }
  });

  it("fails composition when a display exists but its host assets were not supplied", async () => {
    await expect(install({ display: true, withAssets: false })).rejects.toBeInstanceOf(
      ModuleDisplayConfigurationError,
    );
  });
});

describe("module display host asset publication", () => {
  it("serves only the fixed script with JavaScript and revalidation headers", async () => {
    const { app } = await install({ display: true });

    const response = await app.request(DISPLAY_HOST_SCRIPT_PATH);
    expect(response.status).toBe(200);
    expect(await response.text()).toBe(displayHostAssets.script);
    expect(response.headers.get("content-type")).toBe("text/javascript; charset=utf-8");
    expect(response.headers.get("cache-control")).toBe("no-cache");
    expect(response.headers.get("x-content-type-options")).toBe("nosniff");

    const notModified = await app.request(DISPLAY_HOST_SCRIPT_PATH, {
      headers: { "if-none-match": displayHostAssets.scriptEtag },
    });
    expect(notModified.status).toBe(304);
    expect(await notModified.text()).toBe("");
    expect(notModified.headers.get("etag")).toBe(displayHostAssets.scriptEtag);
    expect(notModified.headers.get("cache-control")).toBe("no-cache");

    for (const header of [
      `W/${displayHostAssets.scriptEtag}`,
      "*",
      `"stale", ${displayHostAssets.scriptEtag}`,
    ]) {
      expect(
        (
          await app.request(DISPLAY_HOST_SCRIPT_PATH, {
            headers: { "if-none-match": header },
          })
        ).status,
        header,
      ).toBe(304);
    }
    expect(
      (
        await app.request(DISPLAY_HOST_SCRIPT_PATH, {
          headers: { "if-none-match": '"stale"' },
        })
      ).status,
    ).toBe(200);
  });

  it("exposes no source map, neighboring file, arbitrary role, or request-selected path", async () => {
    const { app } = await install({ display: true });

    for (const candidate of [
      `${DISPLAY_HOST_SCRIPT_PATH}.map`,
      "/assets/ekklesia-display/index.html",
      "/assets/ekklesia-display/secret.txt",
      "/assets/ekklesia-display/../secret.txt",
      "/api/v1/module-ui/announcements/1.4.2/management",
    ]) {
      expect((await app.request(candidate)).status, candidate).toBe(404);
    }
  });

  it("uses identical non-interpolated HTML for every eligible module", async () => {
    const first = await install({
      display: true,
      granted: [displayPermission],
      principal: signedIn(),
    });
    const second = await install({
      display: true,
      granted: ["signage.display.view"],
      id: "signage",
      principal: signedIn(),
    });

    const firstHtml = await (await first.app.request(moduleDisplayPageUrl("announcements"))).text();
    const secondHtml = await (await second.app.request(moduleDisplayPageUrl("signage"))).text();
    expect(firstHtml).toBe(secondHtml);
    expect(firstHtml).not.toContain("announcements");
    expect(secondHtml).not.toContain("signage");
  });

  it("snapshots injected assets and rejects a validator that does not describe its script", async () => {
    const source = createDisplayHostAssets("<html>display host</html>", "export const host = 1;\n");
    const mutable = { ...source };
    const { app } = await install({ assets: mutable, display: true });
    mutable.html = "<html>mutated secret</html>";
    mutable.script = "throw new Error('mutated secret');";

    expect(await (await app.request(DISPLAY_HOST_SCRIPT_PATH)).text()).toBe(source.script);

    await expect(
      install({
        assets: { ...source, scriptEtag: '"stale-validator"' },
        display: true,
      }),
    ).rejects.toBeInstanceOf(ModuleDisplayConfigurationError);
  });

  it("does not publish the generic host script when no eligible display uses it", async () => {
    const { app } = await install({ ui: true, withAssets: false });

    expect((await app.request(DISPLAY_HOST_SCRIPT_PATH)).status).toBe(404);
  });
});