using UnityEngine;
using UnityEditor;

public static class EnableGPUInstancing
{
    private const string MaterialPrefix = "M_";

    [MenuItem("Tools/Optimization/Enable GPU Instancing On M_ Materials")]
    public static void EnableOnMPrefixMaterials()
    {
        string[] materialGuids = AssetDatabase.FindAssets("t:Material");

        int changed = 0;
        int alreadyEnabled = 0;
        int skippedWrongPrefix = 0;
        int skippedInvalid = 0;

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

            if (mat == null || mat.shader == null || !mat.shader.isSupported)
            {
                skippedInvalid++;
                continue;
            }

            if (!mat.name.StartsWith(MaterialPrefix))
            {
                skippedWrongPrefix++;
                continue;
            }

            if (mat.enableInstancing)
            {
                alreadyEnabled++;
                continue;
            }

            mat.enableInstancing = true;
            EditorUtility.SetDirty(mat);
            changed++;
        }

        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();

        Debug.Log(
            $"GPU Instancing terminé sur les matériaux commençant par '{MaterialPrefix}'. " +
            $"Activés : {changed}, " +
            $"déjà actifs : {alreadyEnabled}, " +
            $"ignorés mauvais préfixe : {skippedWrongPrefix}, " +
            $"ignorés invalides : {skippedInvalid}."
        );
    }
}