// ============================================================================
// ResourceCacheManagerTests.cs — 缓存管理器单元测试
// Feature: 001-async-resource-loading
// ============================================================================

using System.Collections;
using NUnit.Framework;
using UnityEngine.TestTools;
using ProjSG.Resource;

[TestFixture]
public class ResourceCacheManagerTests
{
    private ResourceCacheManager _cacheManager;

    [SetUp]
    public void SetUp()
    {
        _cacheManager = ResourceCacheManager.Instance;
    }

    [TearDown]
    public void TearDown()
    {
        _cacheManager.ForceReleaseAll();
    }

    // ====================================================================
    // 缓存命中 / 未命中
    // ====================================================================

    [Test]
    public void GetCached_ReturnsNull_WhenNotCached()
    {
        var result = _cacheManager.GetCached<UnityEngine.Texture2D>("nonexistent/path");
        Assert.IsNull(result);
    }

    [Test]
    public void IsCached_ReturnsFalse_WhenNotCached()
    {
        Assert.IsFalse(_cacheManager.IsCached("nonexistent/path"));
    }

    [Test]
    public void GetCached_ReturnsNull_WhenNullLocation()
    {
        var result = _cacheManager.GetCached<UnityEngine.Texture2D>(null);
        Assert.IsNull(result);
    }

    [Test]
    public void GetCached_ReturnsNull_WhenEmptyLocation()
    {
        var result = _cacheManager.GetCached<UnityEngine.Texture2D>("");
        Assert.IsNull(result);
    }

    [Test]
    public void IsCached_ReturnsFalse_WhenNullOrEmpty()
    {
        Assert.IsFalse(_cacheManager.IsCached(null));
        Assert.IsFalse(_cacheManager.IsCached(""));
    }

    // ====================================================================
    // 释放
    // ====================================================================

    [Test]
    public void Release_DoesNotThrow_WhenLocationNotCached()
    {
        Assert.DoesNotThrow(() => _cacheManager.Release("nonexistent/path"));
    }

    [Test]
    public void ReleaseAll_DoesNotThrow_WhenEmpty()
    {
        Assert.DoesNotThrow(() => _cacheManager.ReleaseAll());
    }

    [Test]
    public void ForceReleaseAll_ResetsCachedCount_ToZero()
    {
        _cacheManager.ForceReleaseAll();
        Assert.AreEqual(0, _cacheManager.CachedCount);
    }

    // ====================================================================
    // CachedCount
    // ====================================================================

    [Test]
    public void CachedCount_IsZero_WhenEmpty()
    {
        _cacheManager.ForceReleaseAll();
        Assert.AreEqual(0, _cacheManager.CachedCount);
    }
}