/**
 * reach.test.ts — the virtual user boundary, at the passage points.
 *
 * A virtual user must simulate the boundary of the future single-user wallet: the
 * access functions are confined to the user currently connected, and no cross-user
 * access is permitted. Before this, `docs.sparqlQuery`/`sparqlUpdate` — both
 * exported from the SDK entry — reached ANY document of ANY identity given a
 * session id and a NURI.
 *
 * The one act that legitimately crosses: DEPOSITING into someone's inbox. It is
 * how a link travels between users at all, and it gives the depositor nothing back.
 */
import { test, expect, mock, afterAll } from "bun:test";
import { sparqlQuery, sparqlUpdate } from "../src/surface/docs";
import { depositInto } from "../src/emulated-verifier/register-write";
import { createEntityDoc, resetRegistryCache, userInbox } from "../src/shared-wallet/account-registry";
import type { RegistrySession } from "../src/shared-wallet/account-registry";
import { configure } from "../src/index";
import { configureStoreRegistry, setCurrentUser } from "../src/shared-wallet/bootstrap";
import { resetCaps, resetConfig, resetStoreRegistry } from "../src/shared-wallet/bootstrap";
import { mayReach, mustNotAttempt } from "../src/emulated-verifier/reach";
import { hasReadCap } from "../src/model/nuri";

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

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

function inject() {
  let n = 0;
  const quads: Array<{ g: string; s: string; p: string; o: string }> = [];
  const ng = {
    doc_create: mock(async () => `did:ng:o:reach${++n}`),
    sparql_update: mock(async (...a: unknown[]) => {
      quads.push({ g: String(a[2]), s: "", p: "", o: String(a[1]) });
      return undefined;
    }),
    sparql_query: mock(async () => ({ results: { bindings: [] } })),
  };
  configure({ ng: ng as any, useShape: (() => {}) as any });
  configureStoreRegistry({ getSession: async () => SESSION, normalizeId: (id) => id.trim() });
  resetRegistryCache();
  resetCaps();
  setCurrentUser(null);
  return { ng, quads };
}

const READ = "SELECT ?s ?p ?o WHERE { ?s ?p ?o }";

test("the guard is inert until the first cap exists (no regression for a cap-free consumer)", async () => {
  const { ng } = inject();
  // Nothing has been created, so no cap has been issued: everything flows.
  expect(mayReach("did:ng:o:anything")).toBe(true);
  await sparqlQuery(SESSION.sessionId, READ, undefined, "did:ng:o:anything");
  expect(ng.sparql_query).toHaveBeenCalledTimes(1);
});

test("once caps exist, a document outside the connected user's reach is refused — read AND write", async () => {
  inject();
  setCurrentUser("alice");
  const mine = await createEntityDoc("alice", "private");

  // Mine: reachable.
  expect(mayReach(mine)).toBe(true);
  await sparqlQuery(SESSION.sessionId, READ, undefined, mine);

  // A well-formed NURI I hold nothing for: named, unreachable. Both directions.
  const theirs = "did:ng:o:someone-elses-doc" as const;
  expect(mayReach(theirs)).toBe(false);
  await expect(sparqlQuery(SESSION.sessionId, READ, undefined, theirs)).rejects.toThrow(
    /does not hold this document.s cap/i,
  );
  await expect(
    sparqlUpdate(SESSION.sessionId, "INSERT DATA { <a> <b> \"c\" }", theirs),
  ).rejects.toThrow(/does not hold this document.s cap/i);
});

test("the boundary follows the connected user — one user's document is another's forbidden NURI", async () => {
  inject();
  setCurrentUser("alice");
  const aliceDoc = await createEntityDoc("alice", "private");
  setCurrentUser("bob");
  const bobDoc = await createEntityDoc("bob", "private");

  expect(mayReach(bobDoc)).toBe(true);
  expect(mayReach(aliceDoc)).toBe(false); // bob is connected
  await expect(sparqlQuery(SESSION.sessionId, READ, undefined, aliceDoc)).rejects.toThrow();

  setCurrentUser("alice");
  expect(mayReach(aliceDoc)).toBe(true);
  expect(mayReach(bobDoc)).toBe(false);
});

test("a user reaches its OWN stores and inbox — the boundary must not lock it out of itself", async () => {
  inject();
  setCurrentUser("alice");
  await createEntityDoc("alice", "protected"); // provisions alice's account
  const inbox = await userInbox("alice", "protected");

  expect(mayReach(inbox)).toBe(true);
  await sparqlQuery(SESSION.sessionId, READ, undefined, inbox);

  // …and not another user's inbox.
  setCurrentUser("bob");
  expect(mayReach(inbox)).toBe(false);
});

test("DEPOSITING into another user's inbox crosses the boundary, and gives nothing back", async () => {
  const { ng } = inject();
  setCurrentUser("bob");
  const bobInbox = await userInbox("bob", "protected");

  setCurrentUser("alice");
  await createEntityDoc("alice", "private"); // alice now holds caps → guard is armed
  expect(mayReach(bobInbox)).toBe(false); // she holds no cap for it

  // The deposit goes through anyway — it is the one legitimate cross-user act.
  const before = ng.sparql_update.mock.calls.length;
  await depositInto(SESSION.sessionId, 'INSERT DATA { <a> <b> "c" }', bobInbox);
  expect(ng.sparql_update.mock.calls.length).toBe(before + 1);

  // …and it grants her nothing: she still cannot read that inbox.
  expect(mayReach(bobInbox)).toBe(false);
  await expect(sparqlQuery(SESSION.sessionId, READ, undefined, bobInbox)).rejects.toThrow(
    /does not hold this document.s cap/i,
  );
});

test("the shim is reached by the MACHINERY, not by an exemption in the boundary", async () => {
  inject();
  setCurrentUser("alice");
  await createEntityDoc("alice", "private"); // arms the emulation, resolves the shim

  // The store-root and the doc-shim are NOT reachable through the virtual-user
  // surface — there is no exemption list any more. The machinery reaches them
  // through its own primitives (`physical.ts`), which the boundary never sees and
  // which are never exported from the package.
  expect(mayReach(`did:ng:${SESSION.privateStoreId}`)).toBe(false);
  await expect(
    sparqlQuery(SESSION.sessionId, READ, undefined, `did:ng:${SESSION.privateStoreId}`),
  ).rejects.toThrow(/does not hold this document's cap/i);

  // …yet the registry works, because it never asked through that door.
  const doc = await createEntityDoc("alice", "protected");
  expect(mayReach(doc)).toBe(true);
});

// The two rules are deliberately redundant, and this is what that buys.
test("rule 1 and rule 2 are independent — the guard still holds if a caller forgets to check", async () => {
  inject();
  setCurrentUser("alice");
  await createEntityDoc("alice", "private"); // arms the emulation
  const theirs = "did:ng:o:not-mine" as const;

  // RULE 2 — a caller that checks first simply does not issue the operation.
  expect(mustNotAttempt(theirs)).toBe(true);

  // RULE 1 — and a caller that does NOT check is refused anyway. This is the whole
  // point of implementing the same criterion in two places: rule 2 is where the
  // model lives (you cannot address what you hold no cap for), rule 1 is what makes
  // a lapse in rule 2 fail loudly instead of quietly succeeding.
  await expect(sparqlQuery(SESSION.sessionId, READ, undefined, theirs)).rejects.toThrow(
    /does not hold this document's cap/i,
  );
});

// Possession decides, not the shape of the reference the caller happens to hold.
test("a BARE reference is reachable when the cap is possessed elsewhere", async () => {
  inject();
  setCurrentUser("alice");
  const doc = await createEntityDoc("alice", "private");

  // `doc` is the bare form — it carries no cap — yet alice possesses that cap, so
  // reaching it is legitimate. Manipulating a bare NURI is normal: references travel
  // bare through content and indexes while the cap sits in what the user holds.
  expect(hasReadCap(doc)).toBe(false);
  expect(mayReach(doc)).toBe(true);
  await sparqlQuery(SESSION.sessionId, READ, undefined, doc);

  // The cap-bearing form of the same document answers alike.
  expect(mayReach(`${doc}:r:OK`)).toBe(true);

  // And bob, holding neither, cannot reach it in either form.
  setCurrentUser("bob");
  expect(mayReach(doc)).toBe(false);
  expect(mayReach(`${doc}:r:OK`)).toBe(false);
});

// The whole point of splitting the machinery out: one API is the app's, the other
// must never be. A regression here is silent and total — an app holding the
// machinery reaches every virtual user's documents.
test("the machinery is NOT part of the package's public surface", async () => {
  const entry: Record<string, unknown> = await import("../src/index");

  for (const name of Object.keys(entry)) {
    expect(name).not.toMatch(/^physical/);
  }
  // Named explicitly, so adding one and forgetting the rule fails here.
  for (const forbidden of ["physicalQuery", "physicalUpdate", "physicalCreate", "subscribePhysicalDoc"]) {
    expect(entry[forbidden]).toBeUndefined();
  }
  // …and the machinery accessors the merged entry deliberately stopped publishing
  // (2026-08-07): internal wiring and test resets are reached by their internal path.
  for (const unpublished of ["getConfig", "getStoreRegistryDeps", "resetConfig", "resetStoreRegistry", "resetCaps", "getCaps", "getCurrentUser"]) {
    expect(entry[unpublished]).toBeUndefined();
  }
  // The cross-account fan-out is gone from the registry entirely.
  const registry = entry.storeRegistry as Record<string, unknown>;
  for (const gone of ["listEntityDocs", "resolveReadGraphs", "allAccounts", "loadShim"]) {
    expect(registry[gone]).toBeUndefined();
  }
});