#if UNITY_EDITOR
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEditor.AddressableAssets;
using UnityEditor.AddressableAssets.Settings;
using UnityEngine;

namespace DDD
{
    public static class AssetPostprocessorEnvironment
    {
        private static readonly HashSet<string> SpriteTargetPaths = new();
        private static readonly HashSet<string> MeshTargetPaths = new();
        
        private static readonly int BaseMap = Shader.PropertyToID("_BaseMap");
        private static readonly int MetallicGlossMap = Shader.PropertyToID("_MetallicGlossMap");
        private static readonly int BumpMap = Shader.PropertyToID("_BumpMap");
        private static readonly int EmissionMap = Shader.PropertyToID("_EmissionMap");

        private const string BaseMeshPrefabPath = "Assets/_DDD/_Raw/Environments/Env_Mesh_Prop.prefab";
        private const string BaseSpritePrefabPath = "Assets/_DDD/_Raw/Environments/Env_Sprite_Background.prefab";
        private const string ShaderName = "Universal Render Pipeline/LitEnvironment";
        private const string Prop = "Prop_";
        private const string BaseColorUpper = "_BASECOLOR";
        private const string MohsUpper = "_MOHS";
        private const string NormalUpper = "_NORMAL";
        private const string EmissionUpper = "_EMISSION";

        public static void OnPreprocessTexture(TextureImporter importer)
        {
            var path = importer.assetPath;
            string fileNameUpper = Utils.FileName(path).ToUpper();

            if (fileNameUpper.Contains(NormalUpper))
            {
                importer.textureType = TextureImporterType.NormalMap;
            }
            else
            {
                importer.textureType = TextureImporterType.Default;
                importer.sRGBTexture = true;
            }
            
            importer.mipmapEnabled = true;
        }

        public static void OnAdd(string path)
        {
            string upperPath = path.ToUpper();

            if (upperPath.Contains(PathConstants.RawEnvSpritesPathUpper) &&
                upperPath.Contains(ExtenstionConstants.PngExtensionUpper))
            {
                if (!SpriteTargetPaths.Contains(path))
                    SpriteTargetPaths.Add(path);
            }
            else if (upperPath.Contains(PathConstants.RawEnvMeshesPathUpper) &&
                     upperPath.Contains(ExtenstionConstants.PngExtensionUpper))
            {
                if (!MeshTargetPaths.Contains(path))
                    MeshTargetPaths.Add(path);
            }
        }

        public static void OnRemove(string path, string movePath = "")
        {
            string upperPath = path.ToUpper();

            if (upperPath.Contains(PathConstants.RawEnvSpritesPathUpper) &&
                upperPath.Contains(ExtenstionConstants.PngExtensionUpper))
            {
                if (!SpriteTargetPaths.Contains(path))
                    SpriteTargetPaths.Add(path);
            }
            else if (upperPath.Contains(PathConstants.RawEnvMeshesPathUpper) &&
                     upperPath.Contains(ExtenstionConstants.PngExtensionUpper))
            {
                if (!MeshTargetPaths.Contains(path))
                    MeshTargetPaths.Add(path);
            }
        }

        public static void BuildMaterialAndPrefab(string path, bool isMesh)
        {
            var di = new DirectoryInfo(path);
            if (!di.Exists) return;

            string folderName = di.Name;
            string rawRoot = PathConstants.RawFolderPath;                // "/_Raw"
            string addrRoot = PathConstants.AddressablesFolderPath;      // "/_Addressables"

            string destDir = path.Replace(rawRoot, addrRoot);
            string materialPath = $"{destDir}/{folderName}{ExtenstionConstants.MaterialExtenstionLower}";
            string prefabPath = $"{destDir}/{Prop}{folderName}{ExtenstionConstants.PrefabExtenstionLower}";
            
            Utils.MakeFolderFromFilePath(materialPath);

            // 머티리얼 생성 또는 로드
            Material mat = AssetDatabase.LoadAssetAtPath<Material>(materialPath);
            if (mat == null)
            {
                mat = new Material(Shader.Find(ShaderName));
                AssetDatabase.CreateAsset(mat, materialPath);
            }

            // PNG 텍스처 매핑
            var files = Directory.GetFiles(path, $"*{ExtenstionConstants.PngExtensionLower}", SearchOption.TopDirectoryOnly);
            foreach (var file in files)
            {
                string texName = Path.GetFileNameWithoutExtension(file).ToUpper();
                var tex = AssetDatabase.LoadAssetAtPath<Texture>(file);
                if (tex == null) continue;

                if (texName.Contains(BaseColorUpper))
                {
                    mat.SetTexture(BaseMap, tex);
                }
                else if (texName.Contains(MohsUpper))
                {
                    mat.SetTexture(MetallicGlossMap, tex);
                }
                else if (texName.Contains(NormalUpper))
                {
                    mat.SetTexture(BumpMap, tex);
                }
                else if (texName.Contains(EmissionUpper))
                {
                    mat.SetTexture(EmissionMap, tex);
                }
            }

            AssetDatabase.ImportAsset(materialPath, ImportAssetOptions.ForceUpdate);
            AssetDatabase.SaveAssets();

            CreateOrUpdatePrefabVariant(folderName, mat, prefabPath, isMesh);
        }

        private static void CreateOrUpdatePrefabVariant(string folderName, Material mat, string prefabPath, bool isMesh)
        {
            if (AssetDatabase.LoadAssetAtPath<GameObject>(prefabPath) != null) return;
            
            string basePrefabPath = isMesh ? BaseMeshPrefabPath : BaseSpritePrefabPath;

            var basePrefab = AssetDatabase.LoadAssetAtPath<GameObject>(basePrefabPath);
            if (basePrefab == null)
            {
                Debug.LogWarning($"Base prefab not found: {basePrefabPath}");
                return;
            }

            GameObject instancePrefab = AssetDatabase.LoadAssetAtPath<GameObject>(prefabPath);
            if (instancePrefab == null)
            {
                instancePrefab = (GameObject)PrefabUtility.InstantiatePrefab(basePrefab);
                instancePrefab.name = $"{Prop}{folderName}";
            }

            var renderer = instancePrefab.GetComponentInChildren<Renderer>();
            if (renderer != null) renderer.sharedMaterial = mat;

            Utils.MakeFolderFromFilePath(prefabPath);
            PrefabUtility.SaveAsPrefabAssetAndConnect(instancePrefab, prefabPath, InteractionMode.AutomatedAction);
            Object.DestroyImmediate(instancePrefab);
            
            AssetDatabase.ImportAsset(prefabPath, ImportAssetOptions.ForceUpdate);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
        }

        public static void BuildTarget()
        {
            foreach (var path in SpriteTargetPaths)
            {
                BuildMaterialAndPrefab(Utils.FolderPath(path), isMesh: false);
            }

            foreach (var path in MeshTargetPaths)
            {
                BuildMaterialAndPrefab(Utils.FolderPath(path), isMesh: true);
            }

            SpriteTargetPaths.Clear();
            MeshTargetPaths.Clear();
        }
    }
}
#endif