/**
 * cold-start-anchor.test.ts — the shim ANCHOR (private-store-root) must be OPENED
 * before the registry reads/writes it, or a cold anchor throws `RepoNotFound`.
 *
 * ── The gap this pins ──────────────────────────────────────────────────────
 * The shim lives in the private-store-root graph (`did:ng:${privateStoreId}`, the
 * "anchor"). Unlike a per-entity doc — whose anchored read on an unopened repo
 * SILENTLY returns 0 rows — the private/store target resolves through the verifier's
 * `resolve_target_for_sparql`, which HARD-errors `RepoNotFound` when the repo is not
 * in `self.repos` (verified in nextgraph-rs `request_processor.rs`). On a wallet whose
 * anchor repo is not yet loaded, both the shim READ (`resolveAccount`/`loadShim`) and
 * the provision WRITE (`ensureAccount`) throw — so the account never provisions.
 *
 * The heal: `resolveAccount`/`loadShim`/`ensureAccount` call `ensureRepoOpen(anchor)`
 * (open-repo.ts, via `doc_subscribe` + first-`State` barrier) before touching the
 * shim — the same open-before-read guard `readScopeIndex` already applies to its
 * index doc. This suite models a fake `ng` where the anchor throws `RepoNotFound`
 * UNTIL it has been `doc_subscribe`-d, and asserts the registry provisions cleanly.
 *
 * RED without the heal (ensureAccount would throw on the cold anchor); GREEN with it.
 */

import { describe, it, expect, mock, afterAll, beforeEach } from "bun:test";
import { ensureAccount, resolveWriteGraph, resetRegistryCache } from "../src/store-registry";
import { resetOpenedRepos } from "../src/open-repo";
import {
  configure,
  configureStoreRegistry,
  resetStoreRegistry,
  resetConfig,
} from "../src/polyfill";

const SESSION = { sessionId: "sid-cold", privateStoreId: "PRIV-COLD" };
const ANCHOR = `did:ng:${SESSION.privateStoreId}`;

afterAll(() => {
  resetConfig();
  resetStoreRegistry();
  resetRegistryCache();
  resetOpenedRepos();
});

beforeEach(() => {
  resetRegistryCache();
  resetOpenedRepos();
});

interface Quad { g: string; s: string; p: string; o: string }

function unescapeLiteral(s: string): string {
  let out = "";
  for (let i = 0; i < s.length; i++) {
    if (s[i] === "\\" && i + 1 < s.length) {
      const next = s[++i];
      out += next === "n" ? "\n" : next === "r" ? "\r" : next === "t" ? "\t" : next!;
    } else out += s[i];
  }
  return out;
}

/**
 * A fake `ng` whose ANCHOR repo behaves like the real private-store target:
 * `sparql_query`/`sparql_update` anchored to it THROW `RepoNotFound` until the
 * anchor has been `doc_subscribe`-d (i.e. opened into `self.repos`). Any OTHER
 * anchor (per-entity docs) behaves normally. `doc_subscribe` fires the first
 * `State` so `ensureRepoOpen` crosses the barrier.
 */
function makeColdAnchorNg() {
  const quads: Quad[] = [];
  let docCounter = 0;
  const opened = new Set<string>();
  let anchorSubscribes = 0;

  const doc_create = mock(async () => `did:ng:o:doc${++docCounter}`);

  const doc_subscribe = mock(async (nuri: string, _sid: string, cb: (r: unknown) => void) => {
    if (nuri === ANCHOR) anchorSubscribes += 1;
    opened.add(nuri);
    setTimeout(() => cb({ V0: { State: {} } }), 0);
    return () => {};
  });

  const sparql_update = mock(async (_sid: string, query: string, anchor?: string) => {
    if (anchor === ANCHOR && !opened.has(ANCHOR)) throw new Error("RepoNotFound");
    // TWO shapes: the POINTER write uses `GRAPH <root>` (keyed by IRI); the account
    // record write into the doc-shim has NO explicit GRAPH (keyed by the anchor arg).
    const gm = query.match(/GRAPH <([^>]+)>\s*\{([\s\S]*)\}/);
    let g: string;
    let body: string;
    if (gm) {
      g = gm[1]!;
      body = gm[2]!;
    } else {
      if (!anchor) return undefined;
      g = anchor;
      body = query.replace(/^\s*INSERT DATA\s*\{/, "").replace(/\}\s*$/, "");
    }
    const sm = body.match(/<([^>]+)>/);
    if (!sm) return undefined;
    const s = sm[1]!;
    const after = body.slice(body.indexOf(sm[0]) + sm[0].length);
    const pairRe = /(?:a|<([^>]+)>)\s+(?:"((?:[^"\\]|\\.)*)"|<([^>]+)>)/g;
    let m: RegExpExecArray | null;
    while ((m = pairRe.exec(after)) !== null) {
      const p = m[1] ?? "urn:ng-eventually:shim:Account";
      const o = m[2] !== undefined ? unescapeLiteral(m[2]) : (m[3] ?? "");
      quads.push({ g, s, p, o });
    }
    return undefined;
  });

  const sparql_query = mock(async (_sid: string, query: string, _base: unknown, anchor?: string) => {
    if (anchor === ANCHOR && !opened.has(ANCHOR)) throw new Error("RepoNotFound");
    // Pointer SELECT (store-root -> doc-shim).
    if (query.includes("<urn:ng-eventually:shim:shimDoc>")) {
      const bindings = quads
        .filter((q) => q.g === anchor && q.p === "urn:ng-eventually:shim:shimDoc")
        .map((q) => ({ shimDoc: { value: q.o } }));
      return { results: { bindings } };
    }
    const subjM = query.match(
      /<([^>]+)>\s+a\s+<urn:ng-eventually:shim:Account>/,
    );
    const onlySubject = subjM ? subjM[1]! : null;
    const bySubject = new Map<string, Record<string, string>>();
    for (const q of quads) {
      if (q.g !== anchor) continue;
      if (onlySubject !== null && q.s !== onlySubject) continue;
      const rec = bySubject.get(q.s) ?? {};
      if (q.p === "urn:ng-eventually:shim:id") rec.id = q.o;
      if (q.p === "urn:ng-eventually:shim:docPublic") rec.docPublic = q.o;
      if (q.p === "urn:ng-eventually:shim:docProtected") rec.docProtected = q.o;
      if (q.p === "urn:ng-eventually:shim:docPrivate") rec.docPrivate = q.o;
      bySubject.set(q.s, rec);
    }
    const bindings = [...bySubject.values()]
      .filter((r) => r.id)
      .map((r) => ({
        id: { value: r.id! },
        docPublic: { value: r.docPublic ?? "" },
        docProtected: { value: r.docProtected ?? "" },
        docPrivate: { value: r.docPrivate ?? "" },
      }));
    return { results: { bindings } };
  });

  return {
    doc_create, doc_subscribe, sparql_update, sparql_query,
    _quads: quads,
    anchorSubscribeCount: () => anchorSubscribes,
  };
}

function inject(ng: ReturnType<typeof makeColdAnchorNg>) {
  configure({ ng: ng as any, useShape: (() => {}) as any });
  configureStoreRegistry({
    getSession: async () => SESSION,
    normalizeId: (u: string) => u.trim().replace(/^@+/, "").toLowerCase(),
  });
  resetRegistryCache();
  resetOpenedRepos();
}

describe("cold-start anchor heal", () => {
  it("ensureAccount provisions over a COLD anchor (RepoNotFound-until-opened) without throwing", async () => {
    const ng = makeColdAnchorNg();
    inject(ng);

    // Without the open-before-shim heal, the read AND the provision write would both
    // throw RepoNotFound on the cold anchor and the account would never persist.
    const rec = await ensureAccount("@cold-alice");
    expect(rec.docPublic).toBeTruthy();
    expect(rec.docProtected).toBeTruthy();
    expect(rec.docPrivate).toBeTruthy();

    // The anchor repo was actually opened (doc_subscribe-d) before the shim op.
    expect(ng.anchorSubscribeCount()).toBeGreaterThan(0);
  });

  it("the provisioned account re-resolves from the shim (real persistence, no RepoNotFound)", async () => {
    const ng = makeColdAnchorNg();
    inject(ng);

    const first = await ensureAccount("@cold-bob");
    // Fresh cache → a real anchored re-read of the shim (anchor already opened → OK).
    resetRegistryCache();
    const again = await ensureAccount("@cold-bob");
    expect(again.docPublic).toBe(first.docPublic);
    expect(again.docProtected).toBe(first.docProtected);
    expect(again.docPrivate).toBe(first.docPrivate);
  });

  it("resolveWriteGraph (scope resolver) works over a cold anchor", async () => {
    const ng = makeColdAnchorNg();
    inject(ng);
    const g = await resolveWriteGraph("@cold-carol", "protected");
    expect(g).toBeTruthy();
  });
});