"use strict";

const test = require("node:test");
const assert = require("node:assert/strict");
const { WalletStore } = require("../src/lib/wallet");
const { AudioAccessStore } = require("../src/lib/access");

const audio = {
  id: "a1",
  ownerUserId: "owner-1",
  creditsCharged: 3,
};

test("owner can access without payment", () => {
  const access = new AudioAccessStore();
  const result = access.canAccess({ audio, userId: "owner-1" });
  assert.equal(result.allowed, true);
  assert.equal(result.reason, "owner");
});

test("non-owner requires payment", () => {
  const access = new AudioAccessStore();
  const result = access.canAccess({ audio, userId: "u2" });
  assert.equal(result.allowed, false);
  assert.equal(result.reason, "payment_required");
  assert.equal(result.creditsRequired, 3);
});

test("unlock debits same credits and creates permanent grant", () => {
  const access = new AudioAccessStore();
  const wallet = new WalletStore();

  wallet.applyTransaction({
    userId: "u2",
    type: "credit",
    amount: 10,
    reason: "topup",
    idempotencyKey: "credit-u2",
  });

  const unlocked = access.unlockWithCredits({ audio, userId: "u2", wallet });
  assert.equal(unlocked.unlocked, true);
  assert.equal(unlocked.charged, 3);
  assert.equal(wallet.getBalance("u2"), 7);

  const canAccess = access.canAccess({ audio, userId: "u2" });
  assert.equal(canAccess.allowed, true);
  assert.equal(canAccess.reason, "grant");
});

test("second unlock call is idempotent and does not double charge", () => {
  const access = new AudioAccessStore();
  const wallet = new WalletStore();

  wallet.applyTransaction({
    userId: "u2",
    type: "credit",
    amount: 10,
    reason: "topup",
    idempotencyKey: "credit-u2-2",
  });

  access.unlockWithCredits({ audio, userId: "u2", wallet });
  access.unlockWithCredits({ audio, userId: "u2", wallet });

  assert.equal(wallet.getBalance("u2"), 7);
});

test("restores grant state from snapshot", () => {
  const access = new AudioAccessStore();
  access.grantAccess("a1", "u2");

  const restored = new AudioAccessStore(access.exportState());
  const canAccess = restored.canAccess({ audio, userId: "u2" });
  assert.equal(canAccess.allowed, true);
  assert.equal(canAccess.reason, "grant");
});