import {
  createAuthenticatedPrincipal,
  parseEkklesiaUserId,
  parseGrantId,
  parsePermissionId,
} from "@ekklesia/contracts";
import {
  type AuthorizationEvaluator,
  type AuthorizationStore,
  AuthorizationStoreError,
  CORE_AUTHORIZATION_GRANTS_MANAGE,
  CORE_PERMISSION_REGISTRY,
} from "@ekklesia/core/authorization";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import { Hono } from "hono";
import { describe, expect, it, vi } from "vitest";
import { CORE_MUTATION_MAX_BODY_BYTES } from "../src/body-limits.js";
import { createGrantsRoutes } from "../src/grants-routes.js";

const trustedOrigin = "https://dashboard.example.test";
const untrustedOrigin = "https://evil.example.test";
const manager = createAuthenticatedPrincipal("manager_1");
const subjectUserId = parseEkklesiaUserId("subject_1");
// Well-formed but never declared in `CORE_PERMISSION_REGISTRY` — used to prove the routes reject
// (or, for listing, still return) an unregistered permission id rather than assuming registration.
const permission = parsePermissionId("calendar.events.read");
// A permission `CORE_PERMISSION_REGISTRY` actually declares, so tests that must reach
// `store.createGrant`/`store.revokeGrant` can do so. This suite exercises `createGrantsRoutes` in
// isolation and intentionally injects `CORE_PERMISSION_REGISTRY` directly rather than a composed
// platform registry — the routes have no notion of "Core" versus "module" permissions, they only
// ever consult whichever registry they are given. Coverage proving a module-declared permission
// works through the exact same route code lives in
// `apps/api/tests/authorization-middleware.test.ts` (unit) and the "installed module permission
// end-to-end" scenario in `apps/api/tests/api-http.integration.ts` (live).
const registeredPermission = CORE_AUTHORIZATION_GRANTS_MANAGE;
const grantId = parseGrantId("11111111-1111-1111-1111-111111111111");

function fakeRuntime(overrides: Partial<EkklesiaIdentityRuntime> = {}): EkklesiaIdentityRuntime {
  return {
    handleAuthRequest: vi.fn(),
    resolvePrincipal: vi.fn().mockResolvedValue(manager),
    ...overrides,
  };
}

function fakeStore(overrides: Partial<AuthorizationStore> = {}): 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(),
    ...overrides,
  };
}

function buildApp(options: {
  readonly allowed?: boolean;
  readonly now?: () => Date;
  readonly runtime?: EkklesiaIdentityRuntime;
  readonly store?: AuthorizationStore;
}) {
  const evaluator: AuthorizationEvaluator = {
    authorize: vi.fn().mockResolvedValue({ allowed: options.allowed ?? true }),
  };
  const runtime = options.runtime ?? fakeRuntime();
  const store = options.store ?? fakeStore();
  const app = new Hono();
  app.route(
    "/",
    createGrantsRoutes({
      evaluator,
      ...(options.now === undefined ? {} : { now: options.now }),
      registry: CORE_PERMISSION_REGISTRY,
      runtime,
      store,
      trustedOrigins: new Set([trustedOrigin]),
    }),
  );
  return { app, evaluator, runtime, store };
}

describe("GET /api/v1/grants", () => {
  it("denies an anonymous or non-manager authenticated caller (evaluator says no)", async () => {
    const { app, evaluator } = buildApp({ allowed: false });

    const response = await app.request(`/api/v1/grants?userId=${subjectUserId}`);

    expect(response.status).toBe(403);
    expect(evaluator.authorize).toHaveBeenCalledWith(
      expect.objectContaining({ baseline: "restricted" }),
    );
  });

  it("allows a caller the evaluator authorizes — whether by platform ownership or a delegated grants.manage grant, the route cannot tell and does not need to (see core/tests/authorization-evaluator.test.ts for that distinction)", async () => {
    const grants = [
      {
        createdAt: new Date("2026-01-01T00:00:00.000Z"),
        id: grantId,
        permission,
        sourceKind: "explicit" as const,
        userId: subjectUserId,
      },
    ];
    const store = fakeStore({ listGrantsForUser: vi.fn().mockResolvedValue({ grants }) });
    const { app } = buildApp({ store });

    const response = await app.request(`/api/v1/grants?userId=${subjectUserId}`);
    const body = (await response.json()) as { grants: unknown[]; nextCursor: string | null };

    expect(response.status).toBe(200);
    expect(body.grants).toHaveLength(1);
    expect(body.nextCursor).toBeNull();
    // The default page size is applied server-side; `sourceKind` filtering stays server-side too.
    expect(store.listGrantsForUser).toHaveBeenCalledWith(subjectUserId, {
      limit: 50,
      sourceKind: "explicit",
    });
  });

  it("rejects a missing or malformed userId query parameter", async () => {
    const { app, store } = buildApp({});

    const response = await app.request("/api/v1/grants?userId=");

    expect(response.status).toBe(400);
    expect(store.listGrantsForUser).not.toHaveBeenCalled();
  });

  it("maps a store infrastructure failure to a sanitized 503", async () => {
    const store = fakeStore({
      listGrantsForUser: vi
        .fn()
        .mockRejectedValue(new AuthorizationStoreError("AUTHORIZATION_GRANT_LIST_FAILED")),
    });
    const { app } = buildApp({ store });

    const response = await app.request(`/api/v1/grants?userId=${subjectUserId}`);

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

describe("POST /api/v1/grants", () => {
  it("rejects a request with no trusted Origin header before ever checking permission", async () => {
    const { app, evaluator } = buildApp({});

    const response = await app.request("/api/v1/grants", {
      body: JSON.stringify({ permission, subjectUserId }),
      headers: { "content-type": "application/json" },
      method: "POST",
    });

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "UNTRUSTED_ORIGIN" });
    expect(evaluator.authorize).not.toHaveBeenCalled();
  });

  it("rejects an untrusted Origin header the same way", async () => {
    const { app } = buildApp({});

    const response = await app.request("/api/v1/grants", {
      body: JSON.stringify({ permission, subjectUserId }),
      headers: { "content-type": "application/json", origin: untrustedOrigin },
      method: "POST",
    });

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

  it("denies a caller the evaluator does not authorize", async () => {
    const { app, store } = buildApp({ allowed: false });

    const response = await app.request("/api/v1/grants", {
      body: JSON.stringify({ permission, subjectUserId }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    });

    expect(response.status).toBe(403);
    expect(store.createGrant).not.toHaveBeenCalled();
  });

  it("creates an explicit grant, deriving sourceKind and actor server-side from the authenticated principal, never from the request body", async () => {
    const createdGrant = {
      createdAt: new Date("2026-01-01T00:00:00.000Z"),
      id: grantId,
      permission: registeredPermission,
      sourceKind: "explicit" as const,
      userId: subjectUserId,
    };
    const store = fakeStore({ createGrant: vi.fn().mockResolvedValue(createdGrant) });
    const { app } = buildApp({ store });

    const response = await app.request("/api/v1/grants", {
      body: JSON.stringify({ permission: registeredPermission, subjectUserId }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    });
    const body = (await response.json()) as { grant: { id: string } };

    expect(response.status).toBe(201);
    expect(body.grant.id).toBe(grantId);
    expect(store.createGrant).toHaveBeenCalledWith(
      expect.objectContaining({
        actor: { type: "user", userId: manager.userId },
        permission: registeredPermission,
        sourceKind: "explicit",
        userId: subjectUserId,
      }),
    );
    // The generic HTTP surface creates unscoped explicit grants only.
    expect(store.createGrant).toHaveBeenCalledWith(
      expect.not.objectContaining({ scope: expect.anything() }),
    );
  });

  it("rejects a well-formed but unregistered permission with the same sanitized denial as an unauthorized caller, and never calls the store", async () => {
    const { app, store } = buildApp({});

    const response = await app.request("/api/v1/grants", {
      body: JSON.stringify({ permission, subjectUserId }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    });

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "AUTHORIZATION_DENIED" });
    expect(store.createGrant).not.toHaveBeenCalled();
  });

  it.each([
    "actor",
    "owner",
    "isOwner",
    "sourceKind",
    "sourceRef",
    "id",
    "grantId",
    "createdAt",
    "revokedAt",
    "createdByActorId",
    "effectivePermissions",
  ])("rejects a request body carrying a disallowed field (%s), even alongside otherwise-valid fields", async (field) => {
    const { app, store } = buildApp({});

    const response = await app.request("/api/v1/grants", {
      body: JSON.stringify({ [field]: "hostile-value", permission, subjectUserId }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    });

    expect(response.status).toBe(400);
    expect(store.createGrant).not.toHaveBeenCalled();
  });

  it("rejects a malformed permission, subject id, scope, or expiresAt", async () => {
    const { app, store } = buildApp({});

    const responses = await Promise.all(
      [
        { permission: "not-namespaced", subjectUserId },
        { permission, subjectUserId: "" },
        { permission, scope: "", subjectUserId },
        { expiresAt: "not-a-date", permission, subjectUserId },
      ].map((body) =>
        app.request("/api/v1/grants", {
          body: JSON.stringify(body),
          headers: { "content-type": "application/json", origin: trustedOrigin },
          method: "POST",
        }),
      ),
    );

    for (const response of responses) {
      expect(response.status).toBe(400);
    }
    expect(store.createGrant).not.toHaveBeenCalled();
  });

  it("maps a store infrastructure failure to a sanitized 503", async () => {
    const store = fakeStore({
      createGrant: vi
        .fn()
        .mockRejectedValue(new AuthorizationStoreError("AUTHORIZATION_GRANT_CREATE_FAILED")),
    });
    const { app } = buildApp({ store });

    const response = await app.request("/api/v1/grants", {
      body: JSON.stringify({ permission: registeredPermission, subjectUserId }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    });

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

describe("POST /api/v1/grants/:grantId/revoke", () => {
  it("rejects a request with no trusted Origin header before ever checking permission", async () => {
    const { app, evaluator } = buildApp({});

    const response = await app.request(`/api/v1/grants/${grantId}/revoke`, { method: "POST" });

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "UNTRUSTED_ORIGIN" });
    expect(evaluator.authorize).not.toHaveBeenCalled();
  });

  it("revokes an explicit grant, deriving the actor server-side from the authenticated principal", async () => {
    const store = fakeStore({ revokeGrant: vi.fn().mockResolvedValue(undefined) });
    const { app } = buildApp({ store });

    const response = await app.request(`/api/v1/grants/${grantId}/revoke`, {
      headers: { origin: trustedOrigin },
      method: "POST",
    });

    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({ success: true });
    expect(store.revokeGrant).toHaveBeenCalledWith({
      actor: { type: "user", userId: manager.userId },
      grantId,
      sourceKind: "explicit",
    });
  });

  it("always constrains revocation to sourceKind explicit, so a relationship-derived grant can never be targeted by id", async () => {
    // The store itself enforces this by treating a sourceKind mismatch exactly like a missing
    // grant; this test proves the route always asks for that constraint, and correctly surfaces
    // the resulting "not found" as 404 rather than leaking that the grant exists but is the wrong
    // kind.
    const store = fakeStore({
      revokeGrant: vi
        .fn()
        .mockRejectedValue(new AuthorizationStoreError("AUTHORIZATION_GRANT_NOT_FOUND")),
    });
    const { app } = buildApp({ store });

    const response = await app.request(`/api/v1/grants/${grantId}/revoke`, {
      headers: { origin: trustedOrigin },
      method: "POST",
    });

    expect(response.status).toBe(404);
    expect(await response.json()).toEqual({ code: "AUTHORIZATION_GRANT_NOT_FOUND" });
    expect(store.revokeGrant).toHaveBeenCalledWith(
      expect.objectContaining({ sourceKind: "explicit" }),
    );
  });

  it("rejects a malformed grant id", async () => {
    const { app, store } = buildApp({});

    const response = await app.request("/api/v1/grants/%20/revoke", {
      headers: { origin: trustedOrigin },
      method: "POST",
    });

    expect(response.status).toBe(400);
    expect(store.revokeGrant).not.toHaveBeenCalled();
  });

  it("maps a store infrastructure failure to a sanitized 503", async () => {
    const store = fakeStore({
      revokeGrant: vi
        .fn()
        .mockRejectedValue(new AuthorizationStoreError("AUTHORIZATION_GRANT_REVOKE_FAILED")),
    });
    const { app } = buildApp({ store });

    const response = await app.request(`/api/v1/grants/${grantId}/revoke`, {
      headers: { origin: trustedOrigin },
      method: "POST",
    });

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

describe("Core grant mutation request body limit", () => {
  it("accepts a comfortably-under-limit grant-creation body and rejects one byte over the exact limit", async () => {
    const store = fakeStore();
    const { app } = buildApp({ store });

    const overSizedBody = "a".repeat(CORE_MUTATION_MAX_BODY_BYTES + 1);
    const overResponse = await app.request("/api/v1/grants", {
      body: overSizedBody,
      headers: {
        "content-length": String(overSizedBody.length),
        "content-type": "application/json",
        origin: trustedOrigin,
      },
      method: "POST",
    });
    expect(overResponse.status).toBe(413);
    expect(await overResponse.json()).toEqual({ code: "REQUEST_BODY_TOO_LARGE" });
    expect(store.createGrant).not.toHaveBeenCalled();

    // A well-formed, comfortably-under-limit payload still succeeds through the same route.
    const underResponse = await app.request("/api/v1/grants", {
      body: JSON.stringify({ permission: registeredPermission, subjectUserId }),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    });
    expect(underResponse.status).not.toBe(413);
  });

  it("rejects an oversized declared Content-Length on grant creation without invoking permission evaluation", async () => {
    const evaluatorAuthorize = vi.fn().mockResolvedValue({ allowed: true });
    const evaluator: AuthorizationEvaluator = { authorize: evaluatorAuthorize };
    const store = fakeStore();
    const app = new Hono();
    app.route(
      "/",
      createGrantsRoutes({
        evaluator,
        registry: CORE_PERMISSION_REGISTRY,
        runtime: fakeRuntime(),
        store,
        trustedOrigins: new Set([trustedOrigin]),
      }),
    );

    const response = await app.request("/api/v1/grants", {
      body: "a",
      headers: {
        "content-length": String(CORE_MUTATION_MAX_BODY_BYTES * 10),
        "content-type": "application/json",
        origin: trustedOrigin,
      },
      method: "POST",
    });

    expect(response.status).toBe(413);
    expect(evaluatorAuthorize).not.toHaveBeenCalled();
    expect(store.createGrant).not.toHaveBeenCalled();
  });

  it("rejects an oversized streamed grant-creation body with no declared Content-Length", async () => {
    const store = fakeStore();
    const { app } = buildApp({ store });
    const chunk = new Uint8Array(1024).fill(97);
    let enqueued = 0;
    const stream = new ReadableStream<Uint8Array>({
      pull(controller) {
        if (enqueued > CORE_MUTATION_MAX_BODY_BYTES) {
          controller.close();
          return;
        }
        enqueued += chunk.length;
        controller.enqueue(chunk);
      },
    });

    const response = await app.request("/api/v1/grants", {
      body: stream,
      duplex: "half",
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    } as RequestInit);

    expect(response.status).toBe(413);
    expect(await response.json()).toEqual({ code: "REQUEST_BODY_TOO_LARGE" });
    expect(store.createGrant).not.toHaveBeenCalled();
  });

  it("does not read an oversized body from an untrusted Origin: the trusted-origin rejection wins first", async () => {
    const store = fakeStore();
    const { app } = buildApp({ store });
    const chunk = new Uint8Array(1024).fill(97);
    let pullCount = 0;
    const stream = new ReadableStream<Uint8Array>({
      pull(controller) {
        pullCount += 1;
        if (pullCount > 3) {
          controller.close();
          return;
        }
        controller.enqueue(chunk);
      },
    });

    const response = await app.request("/api/v1/grants", {
      body: stream,
      duplex: "half",
      headers: { "content-type": "application/json", origin: untrustedOrigin },
      method: "POST",
    } as RequestInit);

    expect(response.status).toBe(403);
    expect(await response.json()).toEqual({ code: "UNTRUSTED_ORIGIN" });
    expect(store.createGrant).not.toHaveBeenCalled();
  });

  it("also bounds the revoke mutation body", async () => {
    const store = fakeStore();
    const { app } = buildApp({ store });

    const response = await app.request(`/api/v1/grants/${grantId}/revoke`, {
      body: "a".repeat(CORE_MUTATION_MAX_BODY_BYTES + 1),
      headers: {
        "content-length": String(CORE_MUTATION_MAX_BODY_BYTES + 1),
        origin: trustedOrigin,
      },
      method: "POST",
    });

    expect(response.status).toBe(413);
    expect(store.revokeGrant).not.toHaveBeenCalled();
  });
});

/**
 * Pass 3 request-contract regressions. Every case here asserts both the sanitized public response
 * *and* that the store was never reached, because the point of each fix is that a malformed or
 * unsupported request is decided at the request boundary rather than turning into database work or
 * an indistinguishable infrastructure failure.
 */
describe("explicit-grant request invariants", () => {
  const validExpiry = "2099-01-01T00:00:00.000Z";

  async function post(app: Hono, body: unknown) {
    return await app.request("/api/v1/grants", {
      body: JSON.stringify(body),
      headers: { "content-type": "application/json", origin: trustedOrigin },
      method: "POST",
    });
  }

  it("rejects a scope field in any form, before any store mutation", async () => {
    // Core keeps scoped-grant semantics for trusted internal callers, but no HTTP middleware
    // supplies a scope to the evaluator, so a scope accepted here could never authorize anything.
    for (const scope of ["calendar-event:123", "", "   ", null, 42, {}, []]) {
      const { app, store } = buildApp({});
      const response = await post(app, { permission: registeredPermission, scope, subjectUserId });

      expect(response.status, `scope ${JSON.stringify(scope)}`).toBe(400);
      expect(await response.json()).toEqual({ code: "INVALID_REQUEST" });
      expect(response.headers.get("cache-control")).toBe("no-store");
      expect(store.createGrant).not.toHaveBeenCalled();
    }
  });

  it("accepts exactly one canonical expiration representation", async () => {
    const createdGrant = {
      createdAt: new Date("2026-01-01T00:00:00.000Z"),
      expiresAt: new Date(validExpiry),
      id: grantId,
      permission: registeredPermission,
      sourceKind: "explicit" as const,
      userId: subjectUserId,
    };
    const store = fakeStore({ createGrant: vi.fn().mockResolvedValue(createdGrant) });
    const { app } = buildApp({ store });

    const response = await post(app, {
      expiresAt: validExpiry,
      permission: registeredPermission,
      subjectUserId,
    });

    expect(response.status).toBe(201);
    expect(store.createGrant).toHaveBeenCalledWith(
      expect.objectContaining({ expiresAt: new Date(validExpiry) }),
    );
  });

  it("rejects normalized-impossible, locale, offset, imprecise, padded, and past expirations", async () => {
    const now = new Date("2026-07-26T12:00:00.000Z");
    for (const expiresAt of [
      // Normalized impossible date: `new Date` silently rewrote this to March 3rd.
      "2026-02-31T00:00:00.000Z",
      "2026-13-01T00:00:00.000Z",
      // Locale-shaped and date-only forms.
      "March 5, 2027",
      "2027-01-01",
      // Missing milliseconds, excess fractional precision, offsets, lowercase separators.
      "2027-01-01T00:00:00Z",
      "2027-01-01T00:00:00.123456Z",
      "2027-01-01T00:00:00.000+02:00",
      "2027-01-01t00:00:00.000z",
      "2027-01-01T00:00:00.000+00:00",
      // Whitespace padding and trailing text.
      " 2027-01-01T00:00:00.000Z",
      "2027-01-01T00:00:00.000Z ",
      "2027-01-01T00:00:00.000Z extra",
      // Past and exactly-now are both dead on arrival.
      "2020-01-01T00:00:00.000Z",
      "2026-07-26T12:00:00.000Z",
      // Non-strings.
      42,
      null,
      true,
    ]) {
      const { app, store } = buildApp({ now: () => now });
      const response = await post(app, {
        expiresAt,
        permission: registeredPermission,
        subjectUserId,
      });

      expect(response.status, `expiresAt ${JSON.stringify(expiresAt)}`).toBe(400);
      expect(await response.json()).toEqual({ code: "INVALID_REQUEST" });
      expect(store.createGrant).not.toHaveBeenCalled();
    }
  });

  it("returns a sanitized 409 for an equivalent grant that is already effective", async () => {
    const store = fakeStore({
      createGrant: vi
        .fn()
        .mockRejectedValue(new AuthorizationStoreError("AUTHORIZATION_GRANT_ALREADY_EXISTS")),
    });
    const { app } = buildApp({ store });

    const response = await post(app, { permission: registeredPermission, subjectUserId });
    const raw = await response.text();

    expect(response.status).toBe(409);
    expect(JSON.parse(raw)).toEqual({ code: "AUTHORIZATION_GRANT_ALREADY_EXISTS" });
    expect(response.headers.get("cache-control")).toBe("no-store");
    // The body is the stable code and nothing else — no existing grant id, actor, scope, source
    // reference, expiry, SQL, constraint name, or driver text.
    expect(Object.keys(JSON.parse(raw))).toEqual(["code"]);
    for (const leaked of [
      grantId,
      manager.userId,
      subjectUserId,
      "calendar-event",
      "constraint",
      "select ",
      "insert ",
      "ekklesia_core_grant",
      "Error",
      "at ",
    ]) {
      expect(raw, `must not leak ${leaked}`).not.toContain(leaked);
    }
  });

  it("rejects a non-canonical grant id on revoke without ever calling the store", async () => {
    for (const raw of [
      "not-a-uuid",
      "0B36B1B6-9A29-4C4E-9E2D-4C0E4C5E6F70",
      "%200b36b1b6-9a29-4c4e-9e2d-4c0e4c5e6f70",
      "0b36b1b6-9a29-4c4e-9e2d-4c0e4c5e6f7",
      "0b36b1b6-9a29-4c4e-9e2d-4c0e4c5e6f700",
      "0b36b1b69a294c4e9e2d4c0e4c5e6f70",
    ]) {
      const { app, store } = buildApp({});
      const response = await app.request(`/api/v1/grants/${raw}/revoke`, {
        headers: { origin: trustedOrigin },
        method: "POST",
      });

      expect(response.status, `grantId ${raw}`).toBe(400);
      expect(await response.json()).toEqual({ code: "INVALID_REQUEST" });
      expect(response.headers.get("cache-control")).toBe("no-store");
      expect(store.revokeGrant).not.toHaveBeenCalled();
    }
  });

  it("still returns the sanitized 404 for a canonical but unknown grant id", async () => {
    const store = fakeStore({
      revokeGrant: vi
        .fn()
        .mockRejectedValue(new AuthorizationStoreError("AUTHORIZATION_GRANT_NOT_FOUND")),
    });
    const { app } = buildApp({ store });

    const response = await app.request(`/api/v1/grants/${grantId}/revoke`, {
      headers: { origin: trustedOrigin },
      method: "POST",
    });

    expect(response.status).toBe(404);
    expect(await response.json()).toEqual({ code: "AUTHORIZATION_GRANT_NOT_FOUND" });
    expect(store.revokeGrant).toHaveBeenCalled();
  });
});

describe("explicit-grant listing pagination", () => {
  function grantAt(index: number, iso: string) {
    return {
      createdAt: new Date(iso),
      id: parseGrantId(`00000000-0000-4000-8000-${String(index).padStart(12, "0")}`),
      permission: registeredPermission,
      sourceKind: "explicit" as const,
      userId: subjectUserId,
    };
  }

  it("applies the default limit of 50 and accepts the 1 and 100 boundaries", async () => {
    for (const [query, expected] of [
      ["", 50],
      ["&limit=1", 1],
      ["&limit=50", 50],
      ["&limit=100", 100],
    ] as const) {
      const { app, store } = buildApp({});
      const response = await app.request(`/api/v1/grants?userId=${subjectUserId}${query}`);

      expect(response.status, query).toBe(200);
      expect(store.listGrantsForUser).toHaveBeenCalledWith(subjectUserId, {
        limit: expected,
        sourceKind: "explicit",
      });
    }
  });

  it("rejects every non-canonical or out-of-range limit before any store work", async () => {
    for (const limit of [
      "0",
      "101",
      "-1",
      "+5",
      "1.0",
      "1.5",
      "01",
      "005",
      " 5",
      "5 ",
      "1e2",
      "",
      "abc",
      "0x10",
      "Infinity",
      "NaN",
    ]) {
      const { app, store } = buildApp({});
      const response = await app.request(
        `/api/v1/grants?userId=${subjectUserId}&limit=${encodeURIComponent(limit)}`,
      );

      expect(response.status, `limit ${JSON.stringify(limit)}`).toBe(400);
      expect(await response.json()).toEqual({ code: "INVALID_REQUEST" });
      expect(response.headers.get("cache-control")).toBe("no-store");
      expect(store.listGrantsForUser).not.toHaveBeenCalled();
    }
  });

  it("rejects unknown and duplicated query keys", async () => {
    for (const query of [
      `userId=${subjectUserId}&sort=asc`,
      `userId=${subjectUserId}&offset=10`,
      `userId=${subjectUserId}&sourceKind=relationship`,
      `userId=${subjectUserId}&userId=${subjectUserId}`,
      `userId=${subjectUserId}&limit=5&limit=6`,
      `userId=${subjectUserId}&cursor=a&cursor=b`,
      `userId=${subjectUserId}&cursor=`,
    ]) {
      const { app, store } = buildApp({});
      const response = await app.request(`/api/v1/grants?${query}`);

      expect(response.status, query).toBe(400);
      expect(store.listGrantsForUser).not.toHaveBeenCalled();
    }
  });

  it("emits a cursor only when another page exists, and traverses without duplicates or omissions", async () => {
    // Three rows sharing one `created_at`, which is exactly the case a timestamp-only keyset
    // boundary would skip or repeat.
    const sameInstant = "2026-01-01T00:00:00.000Z";
    const all = [grantAt(3, sameInstant), grantAt(2, sameInstant), grantAt(1, sameInstant)];

    const seen: string[] = [];
    let cursor: string | null = null;
    let pages = 0;
    do {
      const store = fakeStore({
        listGrantsForUser: vi.fn().mockImplementation((_userId, listOptions) => {
          const startIndex =
            listOptions.after === undefined
              ? 0
              : all.findIndex((grant) => grant.id === listOptions.after.id) + 1;
          const slice = all.slice(startIndex, startIndex + listOptions.limit);
          const more = startIndex + listOptions.limit < all.length;
          const last = slice.at(-1);
          return Promise.resolve({
            grants: slice,
            ...(more && last ? { nextBoundary: { createdAt: last.createdAt, id: last.id } } : {}),
          });
        }),
      });
      const { app } = buildApp({ store });
      const url: string = `/api/v1/grants?userId=${subjectUserId}&limit=1${
        cursor === null ? "" : `&cursor=${encodeURIComponent(cursor)}`
      }`;
      const response = await app.request(url);
      const body = (await response.json()) as {
        grants: { id: string }[];
        nextCursor: string | null;
      };

      expect(response.status).toBe(200);
      expect(response.headers.get("cache-control")).toBe("no-store");
      expect(body.grants).toHaveLength(1);
      seen.push(body.grants[0]?.id as string);
      cursor = body.nextCursor;
      pages += 1;
    } while (cursor !== null && pages < 10);

    expect(pages).toBe(3);
    expect(seen).toEqual(all.map((grant) => grant.id));
    expect(new Set(seen).size).toBe(3);
    // The final page ends the traversal explicitly.
    expect(cursor).toBeNull();
  });

  it("refuses a cursor issued for a different subject, and every malformed encoding", async () => {
    const boundary = { createdAt: new Date("2026-01-01T00:00:00.000Z"), id: grantId };
    const store = fakeStore({
      listGrantsForUser: vi.fn().mockResolvedValue({
        grants: [grantAt(1, boundary.createdAt.toISOString())],
        nextBoundary: boundary,
      }),
    });
    const { app: issuingApp } = buildApp({ store });
    const issued = (await (
      await issuingApp.request(`/api/v1/grants?userId=${subjectUserId}&limit=1`)
    ).json()) as { nextCursor: string };
    expect(issued.nextCursor).toMatch(/^[A-Za-z0-9_-]+$/u);

    const encode = (payload: unknown) =>
      Buffer.from(JSON.stringify(payload), "utf8").toString("base64url");
    const canonical = {
      g: grantId,
      t: "2026-01-01T00:00:00.000Z",
      u: subjectUserId,
      v: 1,
    };

    for (const [label, cursor] of [
      // A cursor minted for a different subject must not be replayable against this one.
      ["other subject", encode({ ...canonical, u: "someone_else_1" })],
      ["wrong version", encode({ ...canonical, v: 2 })],
      ["extra field", encode({ ...canonical, extra: "x" })],
      ["missing field", encode({ g: canonical.g, t: canonical.t, u: canonical.u })],
      ["invalid timestamp", encode({ ...canonical, t: "2026-01-01" })],
      ["non-canonical timestamp", encode({ ...canonical, t: "2026-01-01T00:00:00Z" })],
      ["invalid grant id", encode({ ...canonical, g: "not-a-uuid" })],
      ["array payload", encode([canonical])],
      ["not json", Buffer.from("nonsense", "utf8").toString("base64url")],
      ["padded base64", `${Buffer.from(JSON.stringify(canonical), "utf8").toString("base64")}`],
      ["malformed base64url", "!!!not-base64!!!"],
      ["trailing data", `${encode(canonical)}AA`],
    ] as const) {
      const { app, store: pagedStore } = buildApp({});
      const response = await app.request(
        `/api/v1/grants?userId=${subjectUserId}&cursor=${encodeURIComponent(cursor)}`,
      );
      const raw = await response.text();

      expect(response.status, label).toBe(400);
      expect(JSON.parse(raw)).toEqual({ code: "INVALID_REQUEST" });
      // A rejected cursor reveals nothing it decoded, and does zero store/database work.
      expect(raw).not.toContain(grantId);
      expect(raw).not.toContain("someone_else_1");
      expect(pagedStore.listGrantsForUser).not.toHaveBeenCalled();
    }

    // The cursor the API itself issued is accepted.
    const { app: acceptingApp, store: acceptingStore } = buildApp({});
    const accepted = await acceptingApp.request(
      `/api/v1/grants?userId=${subjectUserId}&cursor=${encodeURIComponent(issued.nextCursor)}`,
    );
    expect(accepted.status).toBe(200);
    expect(acceptingStore.listGrantsForUser).toHaveBeenCalledWith(subjectUserId, {
      after: boundary,
      limit: 50,
      sourceKind: "explicit",
    });
  });
});