// ============================================================================
// ResourcePreloaderTests.cs — 预加载管理器单元测试
// Feature: 001-async-resource-loading
// ============================================================================

using NUnit.Framework;
using ProjSG.Resource;

[TestFixture]
public class ResourcePreloaderTests
{
    private ResourcePreloader _preloader;

    [SetUp]
    public void SetUp()
    {
        _preloader = ResourcePreloader.Instance;
    }

    // ====================================================================
    // 配置注册
    // ====================================================================

    [Test]
    public void RegisterConfig_AcceptsValidConfig()
    {
        var config = new PreloadConfig
        {
            ConfigName = "TestConfig",
            Locations = new[] { "Assets/Test/a.png" },
            IsPermanent = false,
        };

        Assert.DoesNotThrow(() => _preloader.RegisterConfig(config));
    }

    [Test]
    public void RegisterConfig_RejectsNullConfig()
    {
        // Should log error but not throw
        Assert.DoesNotThrow(() => _preloader.RegisterConfig(null));
    }

    [Test]
    public void RegisterConfig_RejectsEmptyName()
    {
        var config = new PreloadConfig
        {
            ConfigName = "",
            Locations = new[] { "Assets/Test/a.png" },
        };

        Assert.DoesNotThrow(() => _preloader.RegisterConfig(config));
    }

    // ====================================================================
    // IsConfigLoaded
    // ====================================================================

    [Test]
    public void IsConfigLoaded_ReturnsFalse_WhenNotLoaded()
    {
        Assert.IsFalse(_preloader.IsConfigLoaded("NotRegistered"));
    }

    [Test]
    public void IsConfigLoaded_ReturnsFalse_ForNewConfig()
    {
        _preloader.RegisterConfig(new PreloadConfig
        {
            ConfigName = "NewConfig",
            Locations = new[] { "Assets/Test/x.png" },
        });

        Assert.IsFalse(_preloader.IsConfigLoaded("NewConfig"));
    }

    // ====================================================================
    // UnloadConfig
    // ====================================================================

    [Test]
    public void UnloadConfig_DoesNotThrow_WhenNotRegistered()
    {
        Assert.DoesNotThrow(() => _preloader.UnloadConfig("NonExistent"));
    }

    [Test]
    public void UnloadConfig_SkipsPermanentConfig()
    {
        _preloader.RegisterConfig(new PreloadConfig
        {
            ConfigName = "PermanentTest",
            Locations = new[] { "Assets/Test/p.png" },
            IsPermanent = true,
        });

        // Should not throw, should log warning
        Assert.DoesNotThrow(() => _preloader.UnloadConfig("PermanentTest"));
    }
}