// 后缀 -> 期望：颜色类贴图开 sRGB；数据类贴图关 sRGB；法线贴图必须是 Normal Map 类型
static readonly string[] ColorSuffix = { "_albedo", "_basecolor", "_diffuse", "_color", "_emission" };
static readonly string[] DataSuffix  = { "_mask", "_metallic", "_roughness", "_smoothness", "_ao", "_occlusion", "_height" };
static readonly string[] NormalSuffix = { "_normal", "_nrm", "_n" };

public static List<string> AuditFolder(string folder)
{
    var issues = new List<string>();
    foreach (var guid in AssetDatabase.FindAssets("t:Texture2D", new[] { folder }))
    {
        string path = AssetDatabase.GUIDToAssetPath(guid);
        if (!(AssetImporter.GetAtPath(path) is TextureImporter ti)) continue;
        string n = System.IO.Path.GetFileNameWithoutExtension(path).ToLowerInvariant();

        if (NormalSuffix.Any(n.EndsWith))
        {
            if (ti.textureType != TextureImporterType.NormalMap)
                issues.Add($"{path}: 名字是法线贴图，但 Texture Type 不是 Normal Map（会被当颜色做 sRGB 解码，也不会按法线格式压缩）");
        }
        else if (DataSuffix.Any(n.EndsWith))
        {
            if (ti.sRGBTexture)
                issues.Add($"{path}: 数据贴图开启了 sRGB，金属度/光滑度/AO 会被错误地“解码变暗”");
        }
        else if (ColorSuffix.Any(n.EndsWith))
        {
            if (!ti.sRGBTexture)
                issues.Add($"{path}: 颜色贴图关闭了 sRGB，颜色会显得发灰、偏亮");
        }
    }
    return issues;
}

// 材质的法线槽里放了非 Normal Map 类型的贴图（Inspector 会提示 Fix Now，但批量导入的材质常被忽略）
public static List<string> AuditMaterials(string folder)
{
    var issues = new List<string>();
    foreach (var guid in AssetDatabase.FindAssets("t:Material", new[] { folder }))
    {
        var mat = AssetDatabase.LoadAssetAtPath<Material>(AssetDatabase.GUIDToAssetPath(guid));
        foreach (var prop in new[] { "_BumpMap", "_DetailNormalMap" })
        {
            if (!mat.HasProperty(prop) || !(mat.GetTexture(prop) is Texture2D tex)) continue;
            if (AssetImporter.GetAtPath(AssetDatabase.GetAssetPath(tex)) is TextureImporter ti && ti.textureType != TextureImporterType.NormalMap)
                issues.Add($"{mat.name}.{prop} = {tex.name}: 贴图不是 Normal Map 类型");
        }
    }
    return issues;
}