import { MODULE_UI_ABI_VERSION, type ModuleUiHostContext } from "@ekklesia/module-ui-sdk";
import { act } from "react";
import { createRoot, type Root } from "react-dom/client";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { HostApp } from "../src/browser/HostApp.js";
import type { EkklesiaHostConfig } from "../src/host-protocol.js";
import { isolatedMountTarget, isolatedText } from "./support/isolated-dom.js";

declare global {
  // eslint-disable-next-line no-var
  var IS_REACT_ACT_ENVIRONMENT: boolean | undefined;
}

const apiBaseUrl = "https://ekklesia.example.test";

let container: HTMLDivElement;
let root: Root;
let consoleError: ReturnType<typeof vi.spyOn>;

beforeEach(() => {
  globalThis.IS_REACT_ACT_ENVIRONMENT = true;
  window.history.replaceState({}, "", "/");
  container = document.createElement("div");
  document.body.append(container);
  root = createRoot(container);
  // The shell deliberately reports failures to the browser console; silence them so a passing run
  // is quiet, and so a test can assert *that* it reported without the noise.
  consoleError = vi.spyOn(console, "error").mockImplementation(() => undefined);
});

afterEach(async () => {
  await act(async () => {
    root.unmount();
  });
  container.remove();
  consoleError.mockRestore();
});

/** One navigation entry, in the wire shape the Dashboard navigation endpoint produces: the module's
 * display name beside the untouched mount descriptor. */
function entry(id: string, name: string, version = "0.1.0", permissions: readonly string[] = []) {
  return {
    module: {
      contributions: [],
      api: { baseUrl: `/api/v1/modules/${id}` },
      id,
      permissions,
      realtime: { baseUrl: `/api/v1/module-realtime/${id}` },
      ui: { url: `/api/v1/module-ui/${id}/${version}` },
      version,
    },
    name,
  };
}

function group(id: string, label: string, modules: ReturnType<typeof entry>[], order = 10) {
  return { id, label, modules, order };
}

interface PlatformStub {
  readonly groups?: ReadonlyArray<ReturnType<typeof group>>;
  readonly ungrouped?: ReadonlyArray<ReturnType<typeof entry>>;
  readonly principal?: unknown;
  readonly navigationStatus?: number;
  readonly navigationThrows?: boolean;
}

function platformFetch(stub: PlatformStub = {}): typeof fetch {
  const groups = stub.groups ?? [];
  const ungrouped = stub.ungrouped ?? (stub.groups ? [] : [entry("example", "Example Module")]);
  return vi.fn(async (input: RequestInfo | URL) => {
    const url = String(input);
    if (url.endsWith("/api/v1/principal")) {
      return new Response(
        JSON.stringify(stub.principal ?? { kind: "authenticated", userId: "user-1" }),
        { headers: { "content-type": "application/json" }, status: 200 },
      );
    }
    if (url.endsWith("/api/v1/dashboard/navigation")) {
      if (stub.navigationThrows) {
        throw new TypeError("network down");
      }
      return new Response(JSON.stringify({ groups, ungrouped }), {
        headers: { "content-type": "application/json" },
        status: stub.navigationStatus ?? 200,
      });
    }
    return new Response("{}", { status: 404 });
  }) as unknown as typeof fetch;
}

interface ArtifactOptions {
  readonly mountThrows?: boolean;
  readonly unmountThrows?: boolean;
  /** Records the container each mount received, so a test can prove a stale mount never touched the
   * newer selection's element. */
  readonly mountedInto?: Element[];
}

/** A module UI artifact namespace, exactly the shape the generic loader parses. */
function artifact(id: string, version: string, options: ArtifactOptions = {}) {
  return {
    default: {
      abi: MODULE_UI_ABI_VERSION,
      id,
      mount(element: Element, context: ModuleUiHostContext) {
        options.mountedInto?.push(element);
        if (options.mountThrows) {
          throw new Error("module mount failed");
        }
        element.textContent = `${context.moduleId} mounted`;
        return () => {
          if (options.unmountThrows) {
            throw new Error("module cleanup failed");
          }
          element.textContent = "";
        };
      },
      version,
    },
  };
}

async function render(
  config: EkklesiaHostConfig,
  importModule?: (url: string) => Promise<unknown>,
): Promise<void> {
  await act(async () => {
    root.render(<HostApp config={config} {...(importModule ? { importModule } : {})} />);
  });
}

function text(): string {
  return container.textContent ?? "";
}

function query(testId: string): Element | null {
  return container.querySelector(`[data-testid="${testId}"]`);
}

async function setInput(testId: string, value: string): Promise<void> {
  const input = query(testId) as HTMLInputElement | null;
  if (!input) {
    throw new Error(`missing input ${testId}`);
  }
  await act(async () => {
    const setter = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, "value")?.set;
    setter?.call(input, value);
    input.dispatchEvent(new Event("input", { bubbles: true }));
  });
}

async function submitLogin(): Promise<void> {
  const form = query("host-login")?.querySelector("form");
  if (!form) {
    throw new Error("missing login form");
  }
  await act(async () => {
    form.dispatchEvent(new Event("submit", { bubbles: true, cancelable: true }));
    await Promise.resolve();
  });
}

interface StatefulAuthPlatform {
  readonly calls: Array<{ readonly init: RequestInit | undefined; readonly url: string }>;
  readonly fetch: typeof fetch;
  authenticated(): boolean;
  setAuthenticated(value: boolean): void;
}

function statefulAuthPlatform(
  options: {
    readonly initiallyAuthenticated?: boolean;
    readonly moduleStatus?: () => number;
    readonly onModuleRequest?: () => Promise<void>;
    readonly onPrincipalRequest?: (authenticated: boolean) => Promise<void>;
    readonly onSignIn?: () => Promise<void>;
    readonly onSignOut?: () => Promise<void>;
  } = {},
): StatefulAuthPlatform {
  let authenticated = options.initiallyAuthenticated ?? false;
  const calls: StatefulAuthPlatform["calls"] = [];
  const implementation = vi.fn(async (input: RequestInfo | URL, init?: RequestInit) => {
    const url = String(input);
    calls.push({ init, url });
    if (url.endsWith("/api/auth/sign-in/email")) {
      await options.onSignIn?.();
      const body = JSON.parse(String(init?.body)) as { email?: unknown; password?: unknown };
      if (body.email !== "owner@example.test" || body.password !== "correct password") {
        return Response.json({ code: "INVALID_EMAIL_OR_PASSWORD" }, { status: 401 });
      }
      authenticated = true;
      return Response.json({ ok: true });
    }
    if (url.endsWith("/api/auth/sign-out")) {
      await options.onSignOut?.();
      authenticated = false;
      return Response.json({ success: true });
    }
    if (url.endsWith("/api/v1/principal")) {
      await options.onPrincipalRequest?.(authenticated);
      return Response.json(
        authenticated ? { kind: "authenticated", userId: "user-1" } : { kind: "anonymous" },
      );
    }
    if (url.endsWith("/api/v1/dashboard/navigation")) {
      return authenticated
        ? Response.json({ groups: [], ungrouped: [entry("example", "Example Module")] })
        : Response.json({ code: "AUTHORIZATION_DENIED" }, { status: 403 });
    }
    if (url.includes("/api/v1/modules/example/")) {
      await options.onModuleRequest?.();
      return new Response("{}", { status: options.moduleStatus?.() ?? 200 });
    }
    return Response.json({ code: "NOT_FOUND" }, { status: 404 });
  }) as unknown as typeof fetch;
  return {
    calls,
    fetch: implementation,
    authenticated: () => authenticated,
    setAuthenticated: (value) => {
      authenticated = value;
    },
  };
}

describe("Ekklesia shell — bootstrap", () => {
  it("renders the module list the navigation returned", async () => {
    await render({
      apiBaseUrl,
      fetch: platformFetch({
        ungrouped: [entry("example", "Example Module"), entry("calendar", "Calendar", "2.0.0")],
      }),
    });

    expect(query("select-example")).not.toBeNull();
    expect(query("select-calendar")).not.toBeNull();
  });

  it("renders the host login for an anonymous viewer, and mounts nothing", async () => {
    await render({ apiBaseUrl, fetch: platformFetch({ principal: { kind: "anonymous" } }) });

    expect(query("host-login")).not.toBeNull();
    expect(query("module-container")).toBeNull();
  });

  it("keeps an authenticated navigation denial distinct from sign-out", async () => {
    await render({ apiBaseUrl, fetch: platformFetch({ navigationStatus: 403 }) });

    expect(query("host-access-denied")).not.toBeNull();
    expect(query("host-login")).toBeNull();
    expect(query("host-logout")).not.toBeNull();
  });

  it("renders a host-owned error when the platform cannot be reached", async () => {
    await render({ apiBaseUrl, fetch: platformFetch({ navigationThrows: true }) });

    expect(query("host-error")).not.toBeNull();
    expect(text()).not.toContain("network down");
  });

  it("says so plainly when no installed module provides a UI", async () => {
    await render({ apiBaseUrl, fetch: platformFetch({ groups: [], ungrouped: [] }) });

    expect(query("host-empty")).not.toBeNull();
  });
});

describe("Ekklesia shell — browser authentication", () => {
  it("renders only a neutral loading state until principal resolves and fetches no navigation early", async () => {
    let releasePrincipal: (() => void) | undefined;
    const principalPending = new Promise<void>((resolve) => {
      releasePrincipal = resolve;
    });
    const calls: string[] = [];
    const fetchImplementation = vi.fn(async (input: RequestInfo | URL) => {
      const url = String(input);
      calls.push(url);
      if (url.endsWith("/api/v1/principal")) {
        await principalPending;
        return Response.json({ kind: "anonymous" });
      }
      return Response.json({ groups: [], ungrouped: [] });
    }) as unknown as typeof fetch;

    await render({ apiBaseUrl, fetch: fetchImplementation });

    expect(query("host-loading")).not.toBeNull();
    expect(query("host-login")).toBeNull();
    expect(query("host-logout")).toBeNull();
    expect(calls).toEqual([`${apiBaseUrl}/api/v1/principal`]);

    await act(async () => {
      releasePrincipal?.();
      await principalPending;
    });
    expect(query("host-login")).not.toBeNull();
    expect(calls).toEqual([`${apiBaseUrl}/api/v1/principal`]);
  });

  it("renders an accessible semantic email/password form with a real reset action and no signup", async () => {
    const platform = statefulAuthPlatform();
    await render({ apiBaseUrl, fetch: platform.fetch });

    const email = query("login-email") as HTMLInputElement;
    const password = query("login-password") as HTMLInputElement;
    const form = query("host-login")?.querySelector("form");
    const submit = form?.querySelector('button[type="submit"]') as HTMLButtonElement;

    expect(email.type).toBe("email");
    expect(email.autocomplete).toBe("username");
    expect(email.labels?.[0]?.textContent).toContain("Email");
    expect(password.type).toBe("password");
    expect(password.autocomplete).toBe("current-password");
    expect(password.labels?.[0]?.textContent).toContain("Password");
    expect(submit.textContent).toBe("Sign in");
    expect(form?.tagName).toBe("FORM");
    // Public registration remains disabled, so the shell still offers no way to ask for an account.
    expect(text()).not.toContain("Create account");
    expect(text()).not.toContain("Sign up");
    // Password recovery is no longer a dead action: Phase 7C Pass 2 gave it a real backend flow, so
    // the control exists and is a real button rather than decorative text.
    const forgot = query("login-forgot-password") as HTMLButtonElement;
    expect(forgot.tagName).toBe("BUTTON");
    expect(forgot.type).toBe("button");
    expect(forgot.textContent).toBe("Forgot password?");
  });

  it("fails invalid credentials generically, clears the password, and never puts it in a URL", async () => {
    const platform = statefulAuthPlatform();
    await render({ apiBaseUrl, fetch: platform.fetch });
    await setInput("login-email", "owner@example.test");
    await setInput("login-password", "wrong and secret");

    await submitLogin();

    const error = query("host-login")?.querySelector('[role="alert"]');
    expect(error?.textContent).toBe("Email or password is incorrect.");
    expect((query("login-email") as HTMLInputElement).value).toBe("owner@example.test");
    expect((query("login-password") as HTMLInputElement).value).toBe("");
    expect(document.activeElement).toBe(query("login-password"));
    expect(platform.calls.map((call) => call.url).join("\n")).not.toContain("wrong and secret");
    expect(consoleError).not.toHaveBeenCalled();
  });

  it("prevents duplicate submissions while one sign-in is pending", async () => {
    let releaseSignIn: (() => void) | undefined;
    const signInPending = new Promise<void>((resolve) => {
      releaseSignIn = resolve;
    });
    const platform = statefulAuthPlatform({ onSignIn: () => signInPending });
    await render({ apiBaseUrl, fetch: platform.fetch });
    await setInput("login-email", "owner@example.test");
    await setInput("login-password", "correct password");

    await submitLogin();
    await submitLogin();

    const signInCalls = platform.calls.filter((call) =>
      call.url.endsWith("/api/auth/sign-in/email"),
    );
    expect(signInCalls).toHaveLength(1);
    expect(
      query("host-login")?.querySelector('button[type="submit"]')?.hasAttribute("disabled"),
    ).toBe(true);

    await act(async () => {
      releaseSignIn?.();
      await signInPending;
      await Promise.resolve();
    });
    expect(query("host-logout")).not.toBeNull();
  });

  it("clears the password while post-sign-in principal resolution is still pending", async () => {
    let releasePrincipal: (() => void) | undefined;
    const principalPending = new Promise<void>((resolve) => {
      releasePrincipal = resolve;
    });
    const platform = statefulAuthPlatform({
      onPrincipalRequest: (authenticated) => (authenticated ? principalPending : Promise.resolve()),
    });
    await render({ apiBaseUrl, fetch: platform.fetch });
    await setInput("login-email", "owner@example.test");
    await setInput("login-password", "correct password");

    await submitLogin();

    expect(platform.authenticated()).toBe(true);
    expect((query("login-password") as HTMLInputElement).value).toBe("");
    expect(
      JSON.parse(
        String(
          platform.calls.find((call) => call.url.endsWith("/api/auth/sign-in/email"))?.init?.body,
        ),
      ),
    ).toEqual({ email: "owner@example.test", password: "correct password" });
    expect(query("host-login")?.querySelector("form")?.getAttribute("aria-busy")).toBe("true");

    await act(async () => {
      releasePrincipal?.();
      await principalPending;
      await Promise.resolve();
    });
    expect(query("host-logout")).not.toBeNull();
  });

  it("submits from the password field with the Enter key", async () => {
    let releaseSignIn: (() => void) | undefined;
    const signInPending = new Promise<void>((resolve) => {
      releaseSignIn = resolve;
    });
    const platform = statefulAuthPlatform({ onSignIn: () => signInPending });
    await render({ apiBaseUrl, fetch: platform.fetch });
    await setInput("login-email", "owner@example.test");
    await setInput("login-password", "correct password");

    await act(async () => {
      query("login-password")?.dispatchEvent(
        new KeyboardEvent("keydown", { bubbles: true, cancelable: true, key: "Enter" }),
      );
      await Promise.resolve();
    });

    expect(
      platform.calls.filter((call) => call.url.endsWith("/api/auth/sign-in/email")),
    ).toHaveLength(1);
    expect((query("login-password") as HTMLInputElement).value).toBe("");

    await act(async () => {
      releaseSignIn?.();
      await signInPending;
      await Promise.resolve();
    });
    expect(query("host-logout")).not.toBeNull();
  });

  it("re-resolves principal and navigation after login without a page reload", async () => {
    const platform = statefulAuthPlatform();
    const importer = vi.fn(async () => artifact("example", "0.1.0"));
    await render({ apiBaseUrl, fetch: platform.fetch }, importer);
    await setInput("login-email", "owner@example.test");
    await setInput("login-password", "correct password");

    await submitLogin();

    expect(query("host-login")).toBeNull();
    expect(query("host-logout")).not.toBeNull();
    expect(isolatedText(query("module-container"))).toBe("example mounted");
    expect(importer).toHaveBeenCalledOnce();
    expect(platform.calls.map((call) => new URL(call.url).pathname)).toEqual([
      "/api/v1/principal",
      "/api/auth/sign-in/email",
      "/api/v1/principal",
      "/api/v1/dashboard/navigation",
      // The host-owned device panel loads with the rest of the shell for an administrator.
      "/api/v1/devices",
    ]);
  });

  it("keeps the current internal URL in place and ignores external or protocol-relative return inputs", async () => {
    window.history.replaceState(
      {},
      "",
      "/?returnTo=%2F%2Fevil.example.test%2Fsteal&next=https%3A%2F%2Fevil.example.test&backslash=%5C%5Cevil.example.test&scheme=javascript%3Aalert%281%29",
    );
    const expectedLocation = window.location.href;
    const platform = statefulAuthPlatform();
    await render({ apiBaseUrl, fetch: platform.fetch }, async () => artifact("example", "0.1.0"));
    await setInput("login-email", "owner@example.test");
    await setInput("login-password", "correct password");

    await submitLogin();

    expect(window.location.href).toBe(expectedLocation);
    expect(platform.calls.every((call) => new URL(call.url).origin === apiBaseUrl)).toBe(true);
    expect(platform.calls.map((call) => call.url).join("\n")).not.toContain("evil.example.test");
    expect(platform.calls.map((call) => call.url).join("\n")).not.toContain("javascript");
  });

  it("shows a safe retry when principal resolution is malformed or unavailable", async () => {
    let healthy = false;
    const fetchImplementation = vi.fn(async (input: RequestInfo | URL) => {
      const url = String(input);
      if (url.endsWith("/api/v1/principal")) {
        return healthy
          ? Response.json({ kind: "authenticated", userId: "user-1" })
          : new Response("database failed at /private/path", { status: 503 });
      }
      return Response.json({ groups: [], ungrouped: [entry("example", "Example Module")] });
    }) as unknown as typeof fetch;
    await render({ apiBaseUrl, fetch: fetchImplementation }, async () =>
      artifact("example", "0.1.0"),
    );

    expect(query("host-error")).not.toBeNull();
    expect(text()).not.toContain("private");

    healthy = true;
    const retry = query("host-error")?.querySelector("button");
    expect(retry).not.toBeNull();
    await act(async () => {
      (retry as HTMLButtonElement).click();
    });
    expect(query("host-logout")).not.toBeNull();
  });

  it("fails safely on a malformed successful principal response and recovers on retry", async () => {
    let healthy = false;
    const fetchImplementation = vi.fn(async (input: RequestInfo | URL) => {
      const url = String(input);
      if (url.endsWith("/api/v1/principal")) {
        return Response.json(
          healthy
            ? { kind: "authenticated", userId: "user-1" }
            : { kind: "authenticated", privatePath: "/sessions/private" },
        );
      }
      return Response.json({ groups: [], ungrouped: [entry("example", "Example Module")] });
    }) as unknown as typeof fetch;
    await render({ apiBaseUrl, fetch: fetchImplementation }, async () =>
      artifact("example", "0.1.0"),
    );

    expect(query("host-error")).not.toBeNull();
    expect(text()).not.toContain("private");
    expect(query("host-login")).toBeNull();

    healthy = true;
    const retry = query("host-error")?.querySelector("button");
    expect(retry).not.toBeNull();
    await act(async () => {
      (retry as HTMLButtonElement).click();
      await Promise.resolve();
    });
    expect(query("host-logout")).not.toBeNull();
  });
});

describe("Ekklesia shell — logout and session expiration", () => {
  it("unmounts module UI and closes realtime before completing server-side logout", async () => {
    let releaseSignOut: (() => void) | undefined;
    const signOutPending = new Promise<void>((resolve) => {
      releaseSignOut = resolve;
    });
    const platform = statefulAuthPlatform({
      initiallyAuthenticated: true,
      onSignOut: () => signOutPending,
    });
    let unmountCalls = 0;
    let closeCalls = 0;
    const source = {
      CLOSED: 2,
      CONNECTING: 0,
      OPEN: 1,
      addEventListener: vi.fn(),
      close: () => {
        closeCalls += 1;
      },
      readyState: 0,
      removeEventListener: vi.fn(),
    } as unknown as EventSource;
    await render(
      {
        apiBaseUrl,
        eventSourceFactory: () => source,
        fetch: platform.fetch,
      },
      async () => ({
        default: {
          abi: MODULE_UI_ABI_VERSION,
          id: "example",
          mount(element: Element, context: ModuleUiHostContext) {
            element.textContent = "example mounted";
            const subscription = context.realtime.subscribe("state", {});
            return () => {
              unmountCalls += 1;
              subscription.close();
            };
          },
          version: "0.1.0",
        },
      }),
    );

    await act(async () => {
      (query("host-logout") as HTMLButtonElement).click();
      await Promise.resolve();
    });

    expect(query("host-signing-out")).not.toBeNull();
    expect(query("module-container")).toBeNull();
    expect(unmountCalls).toBe(1);
    expect(closeCalls).toBe(1);
    expect(platform.authenticated()).toBe(true);

    await act(async () => {
      releaseSignOut?.();
      await signOutPending;
      await Promise.resolve();
    });
    expect(platform.authenticated()).toBe(false);
    expect(query("host-login")).not.toBeNull();

    // A new shell resolves the invalidated server session as anonymous too.
    await act(async () => root.unmount());
    root = createRoot(container);
    await render({ apiBaseUrl, fetch: platform.fetch });
    expect(query("host-login")).not.toBeNull();
  });

  it("ignores a retained module request that resolves after logout unmounts its frame", async () => {
    let authenticatedPrincipalRequests = 0;
    let releaseModuleRequest: (() => void) | undefined;
    const moduleRequestPending = new Promise<void>((resolve) => {
      releaseModuleRequest = resolve;
    });
    let releaseSignOut: (() => void) | undefined;
    const signOutPending = new Promise<void>((resolve) => {
      releaseSignOut = resolve;
    });
    const platform = statefulAuthPlatform({
      initiallyAuthenticated: true,
      moduleStatus: () => 401,
      onModuleRequest: () => moduleRequestPending,
      onPrincipalRequest: (authenticated) => {
        if (!authenticated) {
          return Promise.resolve();
        }
        authenticatedPrincipalRequests += 1;
        return authenticatedPrincipalRequests === 1
          ? Promise.resolve()
          : Promise.reject(new Error("stale revalidation must never run"));
      },
      onSignOut: () => signOutPending,
    });
    const capture: { context?: ModuleUiHostContext; unmountCalls: number } = { unmountCalls: 0 };
    await render({ apiBaseUrl, fetch: platform.fetch }, async () => sessionAwareArtifact(capture));

    const lateRequest = capture.context?.api.request("retained-after-unmount");
    if (!lateRequest) {
      throw new Error("module context was not captured");
    }
    await act(async () => {
      (query("host-logout") as HTMLButtonElement).click();
      await Promise.resolve();
    });

    expect(query("host-signing-out")).not.toBeNull();
    expect(capture.unmountCalls).toBe(1);
    expect(platform.authenticated()).toBe(true);

    await act(async () => {
      releaseModuleRequest?.();
      await lateRequest;
      await Promise.resolve();
    });

    // The 401 belongs to a request retained by an already-unmounted module. It must not abort or
    // replace the newer sign-out transition while the server still owns an authenticated session.
    expect(query("host-signing-out")).not.toBeNull();
    expect(query("host-login")).toBeNull();
    expect(platform.authenticated()).toBe(true);
    expect(authenticatedPrincipalRequests).toBe(1);

    await act(async () => {
      releaseSignOut?.();
      await signOutPending;
      await Promise.resolve();
    });

    expect(platform.authenticated()).toBe(false);
    expect(query("host-login")).not.toBeNull();
  });

  it("does not claim logout succeeded when session invalidation fails", async () => {
    const platform = statefulAuthPlatform({
      initiallyAuthenticated: true,
      onSignOut: () => Promise.reject(new Error("private session failure")),
    });
    await render({ apiBaseUrl, fetch: platform.fetch }, async () => artifact("example", "0.1.0"));

    await act(async () => {
      (query("host-logout") as HTMLButtonElement).click();
      await Promise.resolve();
    });

    expect(query("host-sign-out-error")).not.toBeNull();
    expect(query("host-login")).toBeNull();
    expect(query("module-container")).toBeNull();
    expect(text()).not.toContain("private session failure");
  });

  function sessionAwareArtifact(
    capture: { context?: ModuleUiHostContext; unmountCalls: number },
    options: { readonly subscribeToRealtime?: boolean } = {},
  ) {
    return {
      default: {
        abi: MODULE_UI_ABI_VERSION,
        id: "example",
        mount(element: Element, context: ModuleUiHostContext) {
          capture.context = context;
          element.textContent = "example mounted";
          const subscription = options.subscribeToRealtime
            ? context.realtime.subscribe("state", {})
            : undefined;
          return () => {
            capture.unmountCalls += 1;
            subscription?.close();
            element.textContent = "";
          };
        },
        version: "0.1.0",
      },
    };
  }

  it("returns to login when a module API 401 recheck proves the session became anonymous", async () => {
    const platform = statefulAuthPlatform({
      initiallyAuthenticated: true,
      moduleStatus: () => 401,
    });
    let closeCalls = 0;
    const source = {
      CLOSED: 2,
      CONNECTING: 0,
      OPEN: 1,
      addEventListener: vi.fn(),
      close: () => {
        closeCalls += 1;
      },
      readyState: 0,
      removeEventListener: vi.fn(),
    } as unknown as EventSource;
    const capture: { context?: ModuleUiHostContext; unmountCalls: number } = { unmountCalls: 0 };
    await render(
      {
        apiBaseUrl,
        eventSourceFactory: () => source,
        fetch: platform.fetch,
      },
      async () => sessionAwareArtifact(capture, { subscribeToRealtime: true }),
    );
    platform.setAuthenticated(false);
    const principalCallsBefore = platform.calls.filter((call) =>
      call.url.endsWith("/api/v1/principal"),
    ).length;

    await act(async () => {
      await capture.context?.api.request("expired");
    });

    expect(query("host-login")).not.toBeNull();
    expect(query("module-container")).toBeNull();
    expect(capture.unmountCalls).toBe(1);
    expect(closeCalls).toBe(1);
    expect(platform.calls.filter((call) => call.url.endsWith("/api/v1/principal"))).toHaveLength(
      principalCallsBefore + 1,
    );
  });

  it("preserves an authenticated session after an ordinary module API 401", async () => {
    const platform = statefulAuthPlatform({
      initiallyAuthenticated: true,
      moduleStatus: () => 401,
    });
    const capture: { context?: ModuleUiHostContext; unmountCalls: number } = { unmountCalls: 0 };
    await render({ apiBaseUrl, fetch: platform.fetch }, async () => sessionAwareArtifact(capture));

    await act(async () => {
      const response = await capture.context?.api.request("module-authentication-required");
      expect(response?.status).toBe(401);
      await Promise.resolve();
    });

    expect(query("host-login")).toBeNull();
    expect(isolatedText(query("module-container"))).toBe("example mounted");
    expect(capture.unmountCalls).toBe(0);
    expect(platform.calls.filter((call) => call.url.endsWith("/api/v1/principal"))).toHaveLength(2);
  });

  it("rechecks but does not log out an authenticated principal after an ordinary 403", async () => {
    const platform = statefulAuthPlatform({
      initiallyAuthenticated: true,
      moduleStatus: () => 403,
    });
    const capture: { context?: ModuleUiHostContext; unmountCalls: number } = { unmountCalls: 0 };
    await render({ apiBaseUrl, fetch: platform.fetch }, async () => sessionAwareArtifact(capture));

    await act(async () => {
      const response = await capture.context?.api.request("forbidden");
      expect(response?.status).toBe(403);
      await Promise.resolve();
    });

    expect(query("host-login")).toBeNull();
    expect(isolatedText(query("module-container"))).toBe("example mounted");
    expect(capture.unmountCalls).toBe(0);
    expect(platform.calls.filter((call) => call.url.endsWith("/api/v1/principal"))).toHaveLength(2);
  });

  it("returns to login when a 403 recheck proves the session became anonymous", async () => {
    const platform = statefulAuthPlatform({
      initiallyAuthenticated: true,
      moduleStatus: () => 403,
    });
    const capture: { context?: ModuleUiHostContext; unmountCalls: number } = { unmountCalls: 0 };
    await render({ apiBaseUrl, fetch: platform.fetch }, async () => sessionAwareArtifact(capture));
    platform.setAuthenticated(false);

    await act(async () => {
      await capture.context?.api.request("forbidden-after-expiry");
      await Promise.resolve();
    });

    expect(query("host-login")).not.toBeNull();
    expect(query("module-container")).toBeNull();
    expect(capture.unmountCalls).toBe(1);
  });
});

describe("Ekklesia shell — Dashboard navigation", () => {
  const mediaGroup = () =>
    group("media", "Media", [entry("video", "Video"), entry("livestream", "Livestream", "2.0.0")]);
  const planningGroup = () => group("planning", "Planning", [entry("calendar", "Calendar")], 20);

  it("renders groups with their labels and the modules' display names", async () => {
    await render({
      apiBaseUrl,
      fetch: platformFetch({ groups: [mediaGroup(), planningGroup()] }),
    });

    expect(query("group-media")?.textContent).toBe("MediaVideoLivestream");
    expect(query("group-planning")?.textContent).toBe("PlanningCalendar");
    // The module id is never shown; the manifest name is.
    expect(text()).not.toContain("livestream");
  });

  it("renders groups and modules in exactly the server's order", async () => {
    // The shell sorts nothing: whatever order arrives is the order shown, so the server stays the
    // single authority on arrangement.
    await render({
      apiBaseUrl,
      fetch: platformFetch({
        groups: [
          group("planning", "Planning", [entry("calendar", "Calendar")]),
          group("media", "Media", [
            entry("livestream", "Livestream", "2.0.0"),
            entry("video", "Video"),
          ]),
        ],
      }),
    });

    const labels = [...container.querySelectorAll("h2")].map((heading) => heading.textContent);
    expect(labels).toEqual(["Planning", "Media"]);
    const buttons = [...container.querySelectorAll("nav button")].map(
      (button) => button.textContent,
    );
    expect(buttons).toEqual(["Calendar", "Livestream", "Video"]);
  });

  it("renders ungrouped modules alongside groups, under a heading", async () => {
    await render({
      apiBaseUrl,
      fetch: platformFetch({
        groups: [mediaGroup()],
        ungrouped: [entry("roster", "Roster")],
      }),
    });

    expect(query("group-ungrouped")?.textContent).toBe("OtherRoster");
  });

  it("omits the heading when nothing is grouped, so an unconfigured install reads as a list", async () => {
    await render({
      apiBaseUrl,
      fetch: platformFetch({ ungrouped: [entry("roster", "Roster"), entry("video", "Video")] }),
    });

    expect(query("group-ungrouped")?.textContent).toBe("RosterVideo");
    expect(container.querySelectorAll("h2")).toHaveLength(0);
  });

  it("keeps an empty group visible", async () => {
    await render({
      apiBaseUrl,
      fetch: platformFetch({
        groups: [group("media", "Media", [])],
        ungrouped: [entry("video", "Video")],
      }),
    });

    // The administrator created it; hiding it would look like it had been deleted.
    expect(query("group-media")?.textContent).toBe("Media");
  });

  it("selects the first module in the arranged order and marks it active", async () => {
    await render(
      { apiBaseUrl, fetch: platformFetch({ groups: [mediaGroup(), planningGroup()] }) },
      async (url) => artifact(url.includes("/video/") ? "video" : "other", "0.1.0"),
    );

    expect(query("select-video")?.getAttribute("aria-current")).toBe("page");
    expect(query("select-livestream")?.getAttribute("aria-current")).toBeNull();
  });

  it("mounts a module selected from inside a group, using the descriptor the group carried", async () => {
    const requested: string[] = [];
    await render(
      { apiBaseUrl, fetch: platformFetch({ groups: [mediaGroup(), planningGroup()] }) },
      async (url) => {
        requested.push(url);
        return artifact(url.includes("/calendar/") ? "calendar" : "video", "0.1.0");
      },
    );

    await act(async () => {
      (query("select-calendar") as HTMLButtonElement).click();
    });

    // The nested descriptor is used unchanged: grouping altered nothing about the artifact URL.
    expect(requested).toEqual([
      `${apiBaseUrl}/api/v1/module-ui/video/0.1.0`,
      `${apiBaseUrl}/api/v1/module-ui/calendar/0.1.0`,
    ]);
    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
  });

  it("mounts the identical artifact whichever group a module is presented in", async () => {
    const requestedWhenGrouped: string[] = [];
    await render(
      {
        apiBaseUrl,
        fetch: platformFetch({
          groups: [group("media", "Media", [entry("livestream", "Livestream")])],
        }),
      },
      async (url) => {
        requestedWhenGrouped.push(url);
        return artifact("livestream", "0.1.0");
      },
    );
    await act(async () => {
      root.unmount();
    });

    // The same module, presented somewhere else entirely.
    root = createRoot(container);
    const requestedWhenMoved: string[] = [];
    await render(
      {
        apiBaseUrl,
        fetch: platformFetch({
          groups: [
            group("sunday-production", "Sunday Production", [entry("livestream", "Livestream")], 5),
          ],
        }),
      },
      async (url) => {
        requestedWhenMoved.push(url);
        return artifact("livestream", "0.1.0");
      },
    );

    // Presentation changed; the module did not.
    expect(requestedWhenMoved).toEqual(requestedWhenGrouped);
    expect(query("group-sunday-production")?.textContent).toBe("Sunday ProductionLivestream");
  });
});

describe("Ekklesia shell — mount lifecycle", () => {
  it("keeps fixed shell columns while module content changes width", async () => {
    await render({ apiBaseUrl, fetch: platformFetch() }, async () =>
      artifact("example", "0.1.0"),
    );

    const shell = query("host-shell") as HTMLElement;
    const aside = shell.querySelector("aside") as HTMLElement;
    const main = shell.querySelector("main") as HTMLElement;
    const frame = query("module-container") as HTMLElement;
    expect(shell.style.gridTemplateColumns).toBe("13rem minmax(0, 1fr)");
    expect(aside.style.width).toBe("13rem");
    expect(main.style.minWidth).toBe("0");
    expect(main.style.overflowX).toBe("auto");
    expect(frame.style.minWidth).toBe("0");
  });

  it("mounts the first module into the host's own container", async () => {
    const mountedInto: Element[] = [];
    await render({ apiBaseUrl, fetch: platformFetch() }, async () =>
      artifact("example", "0.1.0", { mountedInto }),
    );

    expect(isolatedText(query("module-container"))).toBe("example mounted");
    expect(query("module-loading")).toBeNull();
    // The module was handed the shell's container, never the page root or the shell's own layout.
    // The artifact receives the loader's isolated root, never the shell's own element (ADR 0040).
    expect(mountedInto[0]).toBe(isolatedMountTarget(query("module-container")));
    expect(mountedInto[0]).not.toBe(container);
    expect(mountedInto[0]).not.toBe(document.body);
  });

  it("imports exactly the URL the navigation published, resolved against the API origin", async () => {
    const requested: string[] = [];
    await render({ apiBaseUrl, fetch: platformFetch() }, async (url) => {
      requested.push(url);
      return artifact("example", "0.1.0");
    });

    expect(requested).toEqual([`${apiBaseUrl}/api/v1/module-ui/example/0.1.0`]);
  });

  it("shows a host-owned loading state until the module mounts", async () => {
    let release: (() => void) | undefined;
    const pending = new Promise<void>((resolve) => {
      release = resolve;
    });

    await render({ apiBaseUrl, fetch: platformFetch() }, async () => {
      await pending;
      return artifact("example", "0.1.0");
    });

    expect(query("module-loading")).not.toBeNull();
    expect(isolatedText(query("module-container"))).toBe("");

    await act(async () => {
      release?.();
      await pending;
    });

    expect(query("module-loading")).toBeNull();
    expect(isolatedText(query("module-container"))).toBe("example mounted");
  });

  it("unmounts the previous module when the selection changes", async () => {
    const unmountedContainers: Element[] = [];
    const importModule = async (url: string) => {
      const id = url.includes("/calendar/") ? "calendar" : "example";
      return {
        default: {
          abi: MODULE_UI_ABI_VERSION,
          id,
          mount(element: Element) {
            element.textContent = `${id} mounted`;
            return () => {
              unmountedContainers.push(element);
              element.textContent = "";
            };
          },
          version: id === "calendar" ? "2.0.0" : "0.1.0",
        },
      };
    };
    await render(
      {
        apiBaseUrl,
        fetch: platformFetch({
          ungrouped: [entry("example", "Example Module"), entry("calendar", "Calendar", "2.0.0")],
        }),
      },
      importModule,
    );
    expect(isolatedText(query("module-container"))).toBe("example mounted");

    await act(async () => {
      (query("select-calendar") as HTMLButtonElement).click();
    });

    expect(unmountedContainers).toHaveLength(1);
    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
  });

  it("keeps a stale load from ever reaching the newer selection's container", async () => {
    const mountedInto: Element[] = [];
    const unmountedContainers: Element[] = [];
    let releaseExample: (() => void) | undefined;
    const examplePending = new Promise<void>((resolve) => {
      releaseExample = resolve;
    });

    const importModule = async (url: string) => {
      const id = url.includes("/calendar/") ? "calendar" : "example";
      if (id === "example") {
        await examplePending;
      }
      return {
        default: {
          abi: MODULE_UI_ABI_VERSION,
          id,
          mount(element: Element) {
            mountedInto.push(element);
            element.textContent = `${id} mounted`;
            return () => {
              unmountedContainers.push(element);
              element.textContent = "";
            };
          },
          version: id === "calendar" ? "2.0.0" : "0.1.0",
        },
      };
    };

    await render(
      {
        apiBaseUrl,
        fetch: platformFetch({
          ungrouped: [entry("example", "Example Module"), entry("calendar", "Calendar", "2.0.0")],
        }),
      },
      importModule,
    );
    // `example` is still importing; nothing has mounted yet.
    expect(mountedInto).toHaveLength(0);

    // Switch to `calendar`, which resolves immediately and mounts.
    await act(async () => {
      (query("select-calendar") as HTMLButtonElement).click();
    });
    const liveContainer = query("module-container");
    const liveMountTarget = isolatedMountTarget(liveContainer);
    expect(isolatedText(liveContainer)).toBe("calendar mounted");

    // Only now does the stale `example` import resolve.
    await act(async () => {
      releaseExample?.();
      await examplePending;
    });

    // It mounted into its own, already-discarded isolated root — never the live one — and was torn
    // down immediately, so the newer selection is untouched.
    expect(isolatedText(liveContainer)).toBe("calendar mounted");
    const staleContainer = mountedInto.find((element) => element !== liveMountTarget);
    expect(staleContainer).toBeDefined();
    expect(staleContainer?.isConnected).toBe(false);
    expect(unmountedContainers).toContain(staleContainer);
  });
});

describe("Ekklesia shell — failure is host-owned", () => {
  it("renders its own error when the artifact cannot be imported", async () => {
    await render({ apiBaseUrl, fetch: platformFetch() }, async () => {
      throw new Error("/srv/ekklesia/modules/example/dist/ui/index.js is missing");
    });

    expect(query("module-error")).not.toBeNull();
    // Not a path, not a stack, not the caught message.
    expect(text()).not.toContain("/srv/ekklesia");
    expect(text()).not.toContain("index.js");
    // The shell itself is still rendered around the failure.
    expect(query("select-example")).not.toBeNull();
    // The real error still reaches the browser console for a developer.
    expect(consoleError).toHaveBeenCalled();
  });

  it("renders its own error when the artifact is not a valid module UI", async () => {
    await render({ apiBaseUrl, fetch: platformFetch() }, async () => ({ notADefault: true }));

    expect(query("module-error")).not.toBeNull();
  });

  it("renders its own error when the artifact claims a different identity", async () => {
    await render({ apiBaseUrl, fetch: platformFetch() }, async () => artifact("example", "9.9.9"));

    expect(query("module-error")).not.toBeNull();
    expect(isolatedText(query("module-container"))).toBe("");
  });

  it("renders its own error when the module's mount throws", async () => {
    await render({ apiBaseUrl, fetch: platformFetch() }, async () =>
      artifact("example", "0.1.0", { mountThrows: true }),
    );

    expect(query("module-error")).not.toBeNull();
  });

  it("stays usable after a failure: another module still mounts", async () => {
    const importModule = async (url: string) => {
      if (url.includes("/example/")) {
        throw new Error("boom");
      }
      return artifact("calendar", "2.0.0");
    };
    await render(
      {
        apiBaseUrl,
        fetch: platformFetch({
          ungrouped: [entry("example", "Example Module"), entry("calendar", "Calendar", "2.0.0")],
        }),
      },
      importModule,
    );
    expect(query("module-error")).not.toBeNull();

    await act(async () => {
      (query("select-calendar") as HTMLButtonElement).click();
    });

    expect(query("module-error")).toBeNull();
    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
  });

  it("survives a module whose cleanup throws, and never re-runs it", async () => {
    let cleanupCalls = 0;
    const importModule = async (url: string) => {
      if (url.includes("/calendar/")) {
        return artifact("calendar", "2.0.0");
      }
      return {
        default: {
          abi: MODULE_UI_ABI_VERSION,
          id: "example",
          mount(element: Element) {
            element.textContent = "example mounted";
            return () => {
              cleanupCalls += 1;
              throw new Error("module cleanup failed");
            };
          },
          version: "0.1.0",
        },
      };
    };
    await render(
      {
        apiBaseUrl,
        fetch: platformFetch({
          ungrouped: [entry("example", "Example Module"), entry("calendar", "Calendar", "2.0.0")],
        }),
      },
      importModule,
    );

    await act(async () => {
      (query("select-calendar") as HTMLButtonElement).click();
    });

    expect(cleanupCalls).toBe(1);
    expect(isolatedText(query("module-container"))).toBe("calendar mounted");

    // Switch back and away again: the throwing cleanup ran once per mount, never re-invoked for an
    // instance already torn down.
    await act(async () => {
      (query("select-example") as HTMLButtonElement).click();
    });
    await act(async () => {
      (query("select-calendar") as HTMLButtonElement).click();
    });
    expect(cleanupCalls).toBe(2);
    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
  });
});