using UnityEditor;
using UnityEngine;

public class ReplaceShaderToLit : EditorWindow
{
    [MenuItem("Tools/材质批量替换为 URP/Lit")]
    static void ReplaceShaders()
    {
        string[] guids = AssetDatabase.FindAssets("t:Material", new[] { "Assets/MyAsset/Materials" });

        foreach (string guid in guids)
        {
            string path = AssetDatabase.GUIDToAssetPath(guid);
            Material mat = AssetDatabase.LoadAssetAtPath<Material>(path);

            if (mat.shader.name != "Universal Render Pipeline/Lit")
            {
                Debug.Log($"替换材质：{mat.name}");

                // 备份贴图
                Texture baseMap = mat.GetTexture("_BaseMap");
                Color baseColor = mat.HasProperty("_BaseColor") ? mat.GetColor("_BaseColor") : Color.white;
                float metallic = mat.HasProperty("_Metallic") ? mat.GetFloat("_Metallic") : 0f;
                float smoothness = mat.HasProperty("_Smoothness") ? mat.GetFloat("_Smoothness") : 0.5f;

                // 替换 Shader
                mat.shader = Shader.Find("Universal Render Pipeline/Lit");

                // 恢复贴图和属性
                mat.SetTexture("_BaseMap", baseMap);
                mat.SetColor("_BaseColor", baseColor);
                mat.SetFloat("_Metallic", metallic);
                mat.SetFloat("_Smoothness", smoothness);
            }
        }

        AssetDatabase.SaveAssets();
        Debug.Log("批量替换完成！");
    }
}