import { describe, it, expect } from "vitest";
import { PairingStore, generatePairingCode } from "../src/pairing/index.js";

describe("PairingStore", () => {
  it("creates and finds a pairing session", () => {
    const store = new PairingStore();
    const session = store.create("device-a-id", "device-a-x25519-pub");
    expect(session.pairingCode).toHaveLength(6);
    expect(session.deviceId).toBe("device-a-id");

    const found = store.find(session.pairingCode);
    expect(found).not.toBeNull();
    expect(found!.deviceId).toBe("device-a-id");
  });

  it("consumes a session (one-time use)", () => {
    const store = new PairingStore();
    const session = store.create("d1", "pub1");

    const consumed = store.consume(session.pairingCode);
    expect(consumed).not.toBeNull();
    expect(consumed!.deviceId).toBe("d1");

    // Second consume returns null
    const again = store.consume(session.pairingCode);
    expect(again).toBeNull();
  });

  it("returns null for unknown code", () => {
    const store = new PairingStore();
    expect(store.find("999999")).toBeNull();
  });

  it("expires sessions after TTL", () => {
    const store = new PairingStore();
    const session = store.create("d1", "pub1");

    // Manually expire by setting expiresAt in the past
    // We access the internal session via find and mutate it
    const found = store.find(session.pairingCode);
    if (found) {
      (found as { expiresAt: number }).expiresAt = Date.now() - 1000;
    }

    expect(store.find(session.pairingCode)).toBeNull();
  });
});

describe("generatePairingCode", () => {
  it("generates 6-digit codes", () => {
    for (let i = 0; i < 20; i++) {
      const code = generatePairingCode();
      expect(code).toHaveLength(6);
      expect(/^\d{6}$/.test(code)).toBe(true);
    }
  });
});