const test = require('node:test');
const assert = require('node:assert/strict');

const {
  buildHashedCacheKey,
  getStatsSnapshot,
  resetStats,
} = require('../src/services/dataPageCache');

test('buildHashedCacheKey is stable for equivalent object key order', () => {
  const left = buildHashedCacheKey('dashboard', {
    query: {
      keyword: ' sofa ',
      filters: {
        channel: 'tmall',
        category: ' furniture ',
      },
    },
    page: 1,
  }, 'v2');

  const right = buildHashedCacheKey('dashboard', {
    page: 1,
    query: {
      filters: {
        category: 'furniture',
        channel: 'tmall',
      },
      keyword: 'sofa',
    },
  }, 'v2');

  assert.equal(left, right);
  assert.match(left, /^dashboard:v2:[a-f0-9]{32}$/);
});

test('buildHashedCacheKey keeps array order significant', () => {
  const first = buildHashedCacheKey('dashboard', { ids: [1, 2, 3] }, 'v1');
  const second = buildHashedCacheKey('dashboard', { ids: [3, 2, 1] }, 'v1');

  assert.notEqual(first, second);
});

test('buildHashedCacheKey separates namespace and version', () => {
  const payload = { page: 1, keyword: 'chair' };

  assert.notEqual(
    buildHashedCacheKey('dashboard', payload, 'v1'),
    buildHashedCacheKey('dashboard', payload, 'v2'),
  );
  assert.notEqual(
    buildHashedCacheKey('dashboard', payload, 'v1'),
    buildHashedCacheKey('analysis', payload, 'v1'),
  );
});

test('resetStats returns an empty stats snapshot', () => {
  resetStats();
  const snapshot = getStatsSnapshot();

  assert.equal(snapshot.total, 0);
  assert.equal(snapshot.memoryHits, 0);
  assert.equal(snapshot.redisHits, 0);
  assert.equal(snapshot.pendingHits, 0);
  assert.equal(snapshot.misses, 0);
  assert.deepEqual(snapshot.labels, []);
  assert.deepEqual(snapshot.recentEvents, []);
});