using UnityEngine;
using UnityEditor;
using System;
using System.IO;
using System.Linq;
using UnityMeshSimplifier;

public class TestBuilder
{
    public static void SimplifyOnly()
    {
        try
        {
            Debug.Log("🛠️ [UNITY] Memulai Proses Pengecilan & Embedding Mesh...");

            string[] prefabPaths = Directory.GetFiles("Assets/InputRaw", "*.prefab", SearchOption.AllDirectories);
            
            foreach (string path in prefabPaths)
            {
                // 1. Load isi prefab
                GameObject go = PrefabUtility.LoadPrefabContents(path);
                if (go != null) 
                {
                    // 2. Jalankan simplifikasi dan tanam mesh ke dalam file prefab
                    ProcessAndEmbed(go, path);
                    
                    // 3. Simpan perubahan ke asset fisik
                    PrefabUtility.SaveAsPrefabAsset(go, path);
                    
                    // 4. Bersihkan memori
                    PrefabUtility.UnloadPrefabContents(go);
                    Debug.Log($"✅ [EMBED] Mesh berhasil ditanam di: {Path.GetFileName(path)}");
                }
            }

            // PENTING: Paksa database aset untuk menyimpan semua perubahan ke disk
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            
            Debug.Log("✅ [UNITY] Semua mesh telah diperkecil dan tertanam permanen.");
            EditorApplication.Exit(0);
        }
        catch (Exception e)
        {
            Debug.LogError($"💀 [FATAL] Gagal saat embedding: {e.Message}");
            EditorApplication.Exit(1);
        }
    }

    static void ProcessAndEmbed(GameObject go, string assetPath)
    {
        var renderers = go.GetComponentsInChildren<Renderer>();
        foreach (var ren in renderers)
        {
            Mesh sourceMesh = (ren is MeshRenderer mr) ? ren.GetComponent<MeshFilter>()?.sharedMesh : 
                             (ren is SkinnedMeshRenderer smr) ? smr.sharedMesh : null;
            
            if (sourceMesh != null)
            {
                var simplifier = new MeshSimplifier();
                simplifier.Initialize(sourceMesh);
                simplifier.SimplifyMesh(0.05f); // 5% dari poligon asli
                
                Mesh newMesh = simplifier.ToMesh();
                newMesh.name = sourceMesh.name + "_Simplified";

                // --- BAGIAN KRUSIAL ---
                // Ini yang membuat mesh baru jadi "bagian" dari file .prefab tersebut
                // Jika baris ini hilang, mesh akan jadi 'None' saat di-build
                AssetDatabase.AddObjectToAsset(newMesh, assetPath);
                // ----------------------
                
                if (ren is MeshRenderer) ren.GetComponent<MeshFilter>().sharedMesh = newMesh;
                else if (ren is SkinnedMeshRenderer s) s.sharedMesh = newMesh;
            }
        }
    }
}