using System;
using Microsoft.Win32;
using Newtonsoft.Json;
using System.Reflection;


namespace WeldingCommon.Utils
{
    public static class RegistrySerializer
    {
        private static string _basePath;
        private static string _subPath;

        // 기본 경로 초기화
        public static void Init(string basePath = "SOFTWARE\\ILSOS\\", string subPath = "PalletInfo\\")
        {
            _basePath = basePath;
            _subPath = subPath;
        }

        public static void SaveToRegistry<T>(string objectName, T value)
        {
            SaveToRegistry(RegistryHive.LocalMachine, _basePath + _subPath + objectName, value);
        }

        public static void SaveToRegistry<T>(RegistryHive hive, string registryPath, T obj)
        {
            if (obj == null) throw new ArgumentNullException(nameof(obj));

            using (RegistryKey baseKey = RegistryKey.OpenBaseKey(hive, RegistryView.Default))
            using (RegistryKey key = baseKey.CreateSubKey(registryPath)) {
                foreach (PropertyInfo prop in typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance)) {
                    if (!prop.CanRead || !prop.CanWrite) continue;

                    object value = prop.GetValue(obj);
                    if (value == null) continue;

                    string serializedValue = SerializePropertyValue(value);
                    if (serializedValue == null) continue; // 직렬화 실패 또는 제외됨

                    key.SetValue(prop.Name, serializedValue);
                }
            }
        }

        public static T LoadFromRegistry<T>(string objectName) where T : new()
        {
            string fullPath = _basePath + _subPath + objectName;
            return LoadFromRegistry<T>(RegistryHive.LocalMachine, fullPath);
        }

        public static T LoadFromRegistry<T>(RegistryHive hive, string registryPath) where T : new()
        {
            T obj = new T();

            using (RegistryKey baseKey = RegistryKey.OpenBaseKey(hive, RegistryView.Default))
            using (RegistryKey key = baseKey.OpenSubKey(registryPath)) {
                if (key == null) return obj;

                foreach (PropertyInfo prop in typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance)) {
                    if (!prop.CanWrite) continue;

                    object regVal = key.GetValue(prop.Name);
                    if (regVal == null) continue;

                    try {
                        object converted = DeserializePropertyValue((string)regVal, prop.PropertyType);
                        prop.SetValue(obj, converted);
                    } catch (Exception ex) {
                        Console.WriteLine($"[Deserialize Error] {prop.Name} → {ex.Message}");
                    }
                }
            }

            return obj;
        }
        public static void DeleteFromRegistry(string objectName)
        {
            DeleteFromRegistry(RegistryHive.LocalMachine, _basePath + _subPath + objectName);
        }

        public static void DeleteFromRegistry(RegistryHive hive, string registryPath)
        {
            try {
                using (RegistryKey baseKey = RegistryKey.OpenBaseKey(hive, RegistryView.Default)) {
                    baseKey.DeleteSubKeyTree(registryPath, throwOnMissingSubKey: false);
                    Console.WriteLine($"[Registry Delete] Deleted: {registryPath}");
                }
            } catch (Exception ex) {
                Console.WriteLine($"[Registry Delete Error] Path: {registryPath}, Error: {ex.Message}");
            }
        }
        private static string SerializePropertyValue(object value)
        {
            if (value == null) return null;

            Type type = value.GetType();

            try {
                // 기본 직렬화 가능한 타입
                if (type == typeof(DateTime))
                    return ((DateTime)value).ToString("o");

                if (type.IsEnum)
                    return value.ToString();

                if (type.IsPrimitive || type == typeof(string) || type == typeof(decimal))
                    return Convert.ToString(value);

                // 테스트 직렬화 시도
                JsonConvert.SerializeObject(value);
                return JsonConvert.SerializeObject(value);
            } catch (Exception ex) {
                Console.WriteLine($"[SerializePropertyValue Warning] Type: {type.FullName}, Error: {ex.Message}");
                return null; // 저장 생략
            }
        }

        private static object DeserializePropertyValue(string value, Type targetType)
        {
            try {
                if (targetType == typeof(DateTime))
                    return DateTime.Parse(value, null, System.Globalization.DateTimeStyles.RoundtripKind);

                if (targetType.IsEnum)
                    return Enum.Parse(targetType, value);

                if (targetType.IsPrimitive || targetType == typeof(string) || targetType == typeof(decimal))
                    return Convert.ChangeType(value, targetType);

                return JsonConvert.DeserializeObject(value, targetType);
            } catch (Exception ex) {
                Console.WriteLine($"[DeserializePropertyValue Warning] Type: {targetType.FullName}, Error: {ex.Message}");
                return null;
            }
        }
    }
}