import { describe, test } from 'node:test';
import assert from 'node:assert/strict';
import { UnifiedKeyManager } from '../../src/core/UnifiedKeyManager.js';

describe('UnifiedKeyManager key uniqueness', () => {
  test('composite keys differ for distinct small tuples', () => {
    const keyManager = new UnifiedKeyManager();
    const keyA = keyManager.createCompositeKey(1, 'rel', 2);
    const keyB = keyManager.createCompositeKey(2, 'rel', 2);
    const keyC = keyManager.createCompositeKey(1, 'rel', 3);
    assert.notStrictEqual(keyA, keyB);
    assert.notStrictEqual(keyA, keyC);
  });

  test('composite keys remain unique for large ids', () => {
    const keyManager = new UnifiedKeyManager();
    const relation = 'rel';
    const srcIdA = 1;
    const srcIdB = 1 + (1 << 18);
    const dstId = 1;
    const keyA = keyManager.createCompositeKey(srcIdA, relation, dstId);
    const keyB = keyManager.createCompositeKey(srcIdB, relation, dstId);
    assert.notStrictEqual(keyA, keyB);
  });

  test('source-relation keys remain unique for large ids', () => {
    const keyManager = new UnifiedKeyManager();
    const relation = 'rel';
    const srcIdA = 1;
    const srcIdB = 1 + (1 << 16);
    const keyA = keyManager.createSrcRelKey(srcIdA, relation);
    const keyB = keyManager.createSrcRelKey(srcIdB, relation);
    assert.notStrictEqual(keyA, keyB);
  });

  test('chain keys remain unique for large ids', () => {
    const keyManager = new UnifiedKeyManager();
    const steps = [{ relation: 'rel', direction: 'out' }];
    const userIdA = 1;
    const userIdB = 1 + (1 << 18);
    const objectId = 42;
    const keyA = keyManager.createChainKey(userIdA, objectId, steps);
    const keyB = keyManager.createChainKey(userIdB, objectId, steps);
    assert.notStrictEqual(keyA, keyB);
  });
});