import { parsePermissionId } from "@ekklesia/contracts";
import { describe, expect, it } from "vitest";
import {
  CORE_AUTHORIZATION_GRANTS_MANAGE,
  CORE_MODULES_UI_READ,
  CORE_PERMISSION_DECLARATIONS,
  CORE_PERMISSION_REGISTRY,
  createPermissionRegistry,
  PermissionRegistryError,
} from "../src/authorization/index.js";

describe("createPermissionRegistry", () => {
  it("builds an immutable registry from a fixed declaration list", () => {
    const id = parsePermissionId("test.example.read");
    const registry = createPermissionRegistry([
      { baseline: "public", description: "An example permission.", id },
    ]);

    expect(registry.has(id)).toBe(true);
    expect(registry.get(id)).toEqual({
      baseline: "public",
      description: "An example permission.",
      id,
    });
    expect(Object.isFrozen(registry)).toBe(true);
    expect(Object.isFrozen(registry.declarations)).toBe(true);
    expect(Object.isFrozen(registry.get(id))).toBe(true);
  });

  it("rejects a duplicate permission id at composition time, not per request", () => {
    const id = parsePermissionId("test.example.read");
    expect(() =>
      createPermissionRegistry([
        { baseline: "public", description: "First.", id },
        { baseline: "restricted", description: "Second.", id },
      ]),
    ).toThrow(PermissionRegistryError);
  });

  it("carries the offending permission id on the duplicate-declaration error (a composition-time, developer-facing detail, not a runtime response)", () => {
    const id = parsePermissionId("test.example.read");
    let captured: unknown;
    try {
      createPermissionRegistry([
        { baseline: "public", description: "First.", id },
        { baseline: "restricted", description: "Second.", id },
      ]);
    } catch (error) {
      captured = error;
    }
    expect(captured).toBeInstanceOf(PermissionRegistryError);
    expect(captured).toMatchObject({
      code: "PERMISSION_REGISTRY_DUPLICATE_DECLARATION",
      permissionId: id,
    });
  });

  it("treats an unregistered permission the same as a malformed one: get/has both fail closed", () => {
    const registered = parsePermissionId("test.example.read");
    const unregistered = parsePermissionId("test.example.unregistered");
    const registry = createPermissionRegistry([
      { baseline: "public", description: "Registered.", id: registered },
    ]);

    expect(registry.has(unregistered)).toBe(false);
    expect(registry.get(unregistered)).toBeUndefined();
  });

  it("fails closed for a malformed permission id passed to get/has, without throwing", () => {
    const registry = createPermissionRegistry([]);

    expect(registry.has("not a valid permission")).toBe(false);
    expect(registry.get(null)).toBeUndefined();
    expect(registry.get(undefined)).toBeUndefined();
    expect(registry.get(42)).toBeUndefined();
    expect(registry.get("media.*")).toBeUndefined();
  });

  it("builds an empty registry from an empty list without error", () => {
    const registry = createPermissionRegistry([]);
    expect(registry.declarations).toEqual([]);
  });
});

describe("CORE_PERMISSION_REGISTRY", () => {
  it("registers exactly core.authorization.grants.manage as restricted", () => {
    const declaration = CORE_PERMISSION_REGISTRY.get(CORE_AUTHORIZATION_GRANTS_MANAGE);
    expect(declaration).toBeDefined();
    expect(declaration?.baseline).toBe("restricted");
    expect(declaration?.id).toBe("core.authorization.grants.manage");
  });

  it("registers core.modules.ui.read as authenticated, not restricted", () => {
    const declaration = CORE_PERMISSION_REGISTRY.get(CORE_MODULES_UI_READ);
    expect(declaration).toBeDefined();
    // Any signed-in user may learn which module UIs the browser host can mount; a shell that
    // rendered nothing until an operator granted each user a permission would be unusable, and the
    // module UIs gate their own content on their own permissions regardless (ADR 0026).
    expect(declaration?.baseline).toBe("authenticated");
    expect(declaration?.id).toBe("core.modules.ui.read");
  });

  it("contains exactly these two permissions and no others", () => {
    expect(CORE_PERMISSION_REGISTRY.declarations.map((declaration) => declaration.id)).toEqual([
      CORE_AUTHORIZATION_GRANTS_MANAGE,
      CORE_MODULES_UI_READ,
    ]);
  });
});

describe("CORE_PERMISSION_DECLARATIONS", () => {
  it("is Core's own declaration list, exported separately from the registry in deeply immutable form", () => {
    expect(CORE_PERMISSION_DECLARATIONS).toEqual([
      {
        baseline: "restricted",
        description: "Create, list, and revoke another user's explicit authorization grants.",
        id: CORE_AUTHORIZATION_GRANTS_MANAGE,
      },
      {
        baseline: "authenticated",
        description: "List the installed module UIs a browser host may mount.",
        id: CORE_MODULES_UI_READ,
      },
    ]);
    expect(Object.isFrozen(CORE_PERMISSION_DECLARATIONS)).toBe(true);
    expect(Object.isFrozen(CORE_PERMISSION_DECLARATIONS[0])).toBe(true);
    expect(Object.isFrozen(CORE_PERMISSION_DECLARATIONS[1])).toBe(true);
  });

  it("matches exactly what CORE_PERMISSION_REGISTRY exposes as its own declarations, so a composer building on top of it never diverges from what Core itself registers", () => {
    expect(CORE_PERMISSION_DECLARATIONS).toEqual(CORE_PERMISSION_REGISTRY.declarations);
  });
});