/**
 * open-repo.test.ts — behavioral tests for ensureRepoOpen / ensureReposOpen
 * (src/open-repo.ts).
 *
 * Core invariant: on a fresh session over a persistent wallet, a scope-index
 * or entity repo is NOT yet in `self.repos`, so an anchored sparql_query returns
 * 0 rows. `ensureRepoOpen(nuri)` calls `doc_subscribe(nuri, …)` FIRST (which
 * pushes the repo into the session), then the anchored read returns data.
 *
 * Fake design:
 *   - sparql_query returns EMPTY for a nuri UNTIL doc_subscribe has been called
 *     for that nuri (tracked in a Set).
 *   - doc_subscribe is a mock that records calls, fires the callback once
 *     (simulating the initial State push), then returns an unsubscribe fn.
 *
 * We test ensureRepoOpen via readUnion (from read-model) because that is the
 * production caller — it gates on ensureReposOpen internally.
 */

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

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

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

const SESSION = { sessionId: "sid-or", privateStoreId: "PRIV-OR" };
const TYPE = "http://www.w3.org/1999/02/22-rdf-syntax-ns#type";
const FP = "http://festipod.org/";

// ---------------------------------------------------------------------------
// Fake ng builder: tracks which nuris have been doc_subscribe-d.
// sparql_query returns rows only AFTER the corresponding nuri is subscribed.
// ---------------------------------------------------------------------------

function makeFakeNgWithSubscribe(
  triplesByDoc: Record<string, Array<[string, string]>>,
) {
  const subscribed = new Set<string>();
  const subscribeCallOrder: string[] = [];

  // doc_subscribe: record the call, fire callback immediately (initial push), return unsub
  const doc_subscribe = mock(async (nuri: string, _sid: string, cb: (r: unknown) => void) => {
    subscribed.add(nuri);
    subscribeCallOrder.push(nuri);
    // Simulate initial State push (synchronously deferred so the subscription
    // setup promise path in ensureRepoOpen can resolve it).
    setTimeout(() => cb({ V0: { State: {} } }), 0);
    return () => {}; // unsubscribe fn
  });

  const sparql_query = mock(async (_sid: string, _query: string, _base: unknown, anchor: unknown) => {
    const doc = anchor as string | undefined;
    if (!doc) return { results: { bindings: [] } };
    // Only return data if the repo has been subscribed (i.e. opened)
    if (!subscribed.has(doc)) return { results: { bindings: [] } };
    const triples = triplesByDoc[doc];
    if (!triples) return { results: { bindings: [] } };
    const bindings = triples.map(([p, o]) => ({
      s: { value: doc },
      p: { value: p },
      o: { value: o },
    }));
    return { results: { bindings } };
  });

  const doc_create = mock(async () => "did:ng:o:new");
  const sparql_update = mock(async () => undefined);

  return { doc_subscribe, sparql_query, doc_create, sparql_update, subscribed, subscribeCallOrder };
}

function inject(ng: ReturnType<typeof makeFakeNgWithSubscribe>) {
  configure({ ng: ng as any, useShape: (() => {}) as any });
  configureStoreRegistry({
    getSession: async () => SESSION,
    normalizeId: (u: string) => u,
    provisionRetry: { attempts: 1 },
  });
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------

describe("ensureRepoOpen", () => {
  it("calls doc_subscribe BEFORE the anchored read returns data", async () => {
    const ng = makeFakeNgWithSubscribe({
      "did:ng:o:a": [[TYPE, `${FP}Event`], [`${FP}title`, "Alpha"]],
    });
    inject(ng);

    // Directly call ensureRepoOpen then verify read sees data
    await ensureRepoOpen("did:ng:o:a");

    // doc_subscribe was called for the nuri
    expect(ng.doc_subscribe).toHaveBeenCalledTimes(1);
    expect(ng.subscribeCallOrder[0]).toBe("did:ng:o:a");

    // sparql_query was called AFTER subscribe (ensureRepoOpen guarantees ordering)
    const result = await readUnion(["did:ng:o:a"]);
    expect(result.length).toBe(1);
    expect(result[0]!.props[`${FP}title`]).toEqual(["Alpha"]);
  });

  it("WITHOUT doc_subscribe, sparql_query returns 0 rows (verifies fake mechanics)", async () => {
    const ng = makeFakeNgWithSubscribe({
      "did:ng:o:a": [[TYPE, `${FP}Event`], [`${FP}title`, "Alpha"]],
    });
    inject(ng);

    // Do NOT call ensureRepoOpen — subscribed Set remains empty
    // Query directly (bypass readUnion which calls ensureReposOpen internally)
    const result = await ng.sparql_query("sid-or", "SELECT ?s ?p ?o WHERE { ?s ?p ?o }", undefined, "did:ng:o:a");
    const bindings = (result as any).results.bindings;
    expect(bindings.length).toBe(0); // not subscribed → 0 rows (confirms fake design)
  });

  it("idempotence: a 2nd ensureRepoOpen for the same nuri does NOT re-subscribe", async () => {
    const ng = makeFakeNgWithSubscribe({
      "did:ng:o:b": [[TYPE, `${FP}Event`]],
    });
    inject(ng);

    await ensureRepoOpen("did:ng:o:b");
    await ensureRepoOpen("did:ng:o:b"); // second call

    // doc_subscribe must have been called exactly ONCE
    expect(ng.doc_subscribe).toHaveBeenCalledTimes(1);
  });

  it("no-op when the fake ng has no doc_subscribe (unit fake path)", async () => {
    // Fake ng WITHOUT doc_subscribe
    const noSubscribeNg = {
      doc_create: mock(async () => "did:ng:o:new"),
      sparql_update: mock(async () => undefined),
      sparql_query: mock(async () => ({ results: { bindings: [] } })),
    };
    configure({ ng: noSubscribeNg as any, useShape: (() => {}) as any });
    configureStoreRegistry({
      getSession: async () => SESSION,
      normalizeId: (u: string) => u,
      provisionRetry: { attempts: 1 },
    });

    // Must not throw; nuri is added to opened Set (guard skips subscribe)
    await expect(ensureRepoOpen("did:ng:o:c")).resolves.toBeUndefined();

    // Calling again should also be a no-op (idempotent, already in opened)
    await expect(ensureRepoOpen("did:ng:o:c")).resolves.toBeUndefined();
  });
});

describe("ensureReposOpen", () => {
  it("opens all provided nuris in parallel (one subscribe per unique nuri)", async () => {
    const ng = makeFakeNgWithSubscribe({
      "did:ng:o:x": [[TYPE, `${FP}Event`]],
      "did:ng:o:y": [[TYPE, `${FP}Event`]],
    });
    inject(ng);

    await ensureReposOpen(["did:ng:o:x", "did:ng:o:y"]);

    expect(ng.doc_subscribe).toHaveBeenCalledTimes(2);
    expect(ng.subscribed.has("did:ng:o:x")).toBe(true);
    expect(ng.subscribed.has("did:ng:o:y")).toBe(true);
  });

  it("deduplicates: repeated nuri in input leads to exactly one subscribe", async () => {
    const ng = makeFakeNgWithSubscribe({
      "did:ng:o:dup": [[TYPE, `${FP}Event`]],
    });
    inject(ng);

    await ensureReposOpen(["did:ng:o:dup", "did:ng:o:dup", "did:ng:o:dup"]);

    expect(ng.doc_subscribe).toHaveBeenCalledTimes(1);
  });

  it("empty or all-falsy input is a no-op (no subscribe calls)", async () => {
    const ng = makeFakeNgWithSubscribe({});
    inject(ng);

    await ensureReposOpen([]);
    await ensureReposOpen(["" as any]);

    expect(ng.doc_subscribe).toHaveBeenCalledTimes(0);
  });

  it("readUnion triggers doc_subscribe then returns data (integration path)", async () => {
    const ng = makeFakeNgWithSubscribe({
      "did:ng:o:p": [[TYPE, `${FP}Participation`], [`${FP}event`, "did:ng:o:e"]],
    });
    inject(ng);

    const subjects = await readUnion(["did:ng:o:p"]);

    // doc_subscribe was called as part of ensureReposOpen inside readUnion
    expect(ng.doc_subscribe).toHaveBeenCalledTimes(1);
    expect(subjects.length).toBe(1);
    expect(subjects[0]!.props[`${FP}event`]).toEqual(["did:ng:o:e"]);
  });
});