/**
 * ReadCap ACTIVE — end-to-end proof that the emulated SDK enforces per-DOCUMENT
 * isolation, driven by per-entity documents + DIRECTED read grants.
 *
 * Mirrors what the app does: create an entity document through the REAL registry
 * (`createEntityDoc`), declare its cap policy via `getCaps().open(doc, scope,
 * owner)`, set the current identity, and — when the app decides two identities
 * are related — issue a DIRECTED read grant on each of the owner's protected
 * documents (`getCaps().grantRead(doc, granteeId)`). Whether identities are
 * "connected" is the application's own concept: this test plays that role
 * directly. The read filter then discriminates:
 *   (a) an ungranted principal is denied a PROTECTED doc; granted once the owner
 *       issues a directed grant; PUBLIC readable throughout — via the ACTIVE
 *       ReadCap.
 *   (b) no grant → no protected read (a reader cannot grant itself).
 */
import { test, expect, mock, afterAll } from "bun:test";
import { createEntityDoc, resetRegistryCache } from "../src/store-registry";
import type { RegistrySession } from "../src/store-registry";
import {
  configure,
  configureStoreRegistry,
  resetStoreRegistry,
  resetConfig,
  getCaps,
  resetCaps,
  setCurrentUser,
} from "../src/polyfill";
import { filterReadable } from "../src/read-filter";

afterAll(() => {
  resetConfig();
  resetStoreRegistry();
  resetCaps();
  setCurrentUser(null);
});

const SESSION: RegistrySession = { sessionId: "sid", privateStoreId: "PRIV" };

function inject() {
  let n = 0;
  const ng = {
    doc_create: mock(async () => `did:ng:o:doc${++n}`),
    sparql_update: mock(async () => undefined),
    sparql_query: mock(async () => ({ results: { bindings: [] } })),
  };
  configure({ ng: ng as any, useShape: (() => {}) as any });
  // Synchronous fake store → no sync lag; disable the anti-fork retry backoff.
  configureStoreRegistry({ getSession: async () => SESSION, normalizeId: (id) => id.trim(), provisionRetry: { attempts: 1 } });
  resetRegistryCache();
  resetCaps();
  setCurrentUser(null);
  return ng;
}

/** The app's relationship concept, played inline: grant `reader` the read cap of
 *  every protected document owned by `owner`. */
function grantOwnerProtectedTo(owner: string, reader: string) {
  for (const doc of getCaps().protectedDocsOf(owner)) getCaps().grantRead(doc, reader);
}

test("ReadCap active: a private entity doc created via the real registry is hidden from another principal", async () => {
  inject();

  const aliceDoc = await createEntityDoc("alice", "private");
  getCaps().open(aliceDoc, "private", "alice");

  const bobDoc = await createEntityDoc("bob", "public");
  getCaps().open(bobDoc, "public", "bob");

  const items = [
    { "@graph": aliceDoc, "@id": "a1", label: "alice-private" },
    { "@graph": bobDoc, "@id": "b1", label: "bob-public" },
  ];

  expect(filterReadable(items, getCaps(), "bob").map((i) => i["@id"])).toEqual(["b1"]);
  expect(filterReadable(items, getCaps(), "alice").map((i) => i["@id"]).sort()).toEqual(["a1", "b1"]);
  expect(filterReadable(items, getCaps(), null).map((i) => i["@id"])).toEqual(["b1"]);
  expect(getCaps().hasReadPolicy()).toBe(true);
});

// (a) protected hidden while ungranted → revealed after a DIRECTED grant; public
//     readable regardless — all through the ACTIVE ReadCap.
test("(a) PROTECTED doc: hidden ungranted, revealed after a DIRECTED grant, PUBLIC always readable", async () => {
  inject();

  const aliceProtected = await createEntityDoc("alice", "protected");
  getCaps().open(aliceProtected, "protected", "alice");
  const alicePublic = await createEntityDoc("alice", "public");
  getCaps().open(alicePublic, "public", "alice");

  const items = [
    { "@graph": aliceProtected, "@id": "p1" },
    { "@graph": alicePublic, "@id": "u1" },
  ];
  const view = (u: string) => filterReadable(items, getCaps(), u).map((i) => i["@id"]).sort();

  // BEFORE any grant: bob sees only the public item.
  expect(view("bob")).toEqual(["u1"]);
  expect(view("alice")).toEqual(["p1", "u1"]);

  // The app decides alice↔bob are related and grants bob the read cap of alice's
  // protected documents.
  grantOwnerProtectedTo("alice", "bob");

  expect(view("bob")).toEqual(["p1", "u1"]);
  // A third, ungranted principal still sees only the public one.
  expect(view("carol")).toEqual(["u1"]);
});

// (b) An identity gets no protected read until the OWNER issues the grant — a
//     reader cannot grant itself.
test("(b) no directed grant → no protected read", async () => {
  inject();

  const aliceProtected = await createEntityDoc("alice", "protected");
  getCaps().open(aliceProtected, "protected", "alice");
  const items = [{ "@graph": aliceProtected, "@id": "p1" }];
  const view = (u: string) => filterReadable(items, getCaps(), u).map((i) => i["@id"]);

  // mallory holds no grant on alice's protected doc → denied.
  expect(view("mallory")).toEqual([]);

  // Granting bob (a different, legitimate reader) leaves mallory denied.
  grantOwnerProtectedTo("alice", "bob");
  expect(view("mallory")).toEqual([]);
  expect(view("bob")).toEqual(["p1"]);
});