using System;
using System.Collections.Generic;
using UnityEngine;

namespace Ragdoll
{
    public delegate void ResetDelegate(object value);

    [AttributeUsage(AttributeTargets.Field)]
    public class RdResetAttribute : Attribute
    {
        public object DefaultValue { get; set; }

        public RdResetAttribute(object defaultValue = null)
        {
            DefaultValue = defaultValue;
        }
    }

    public static class RdResetTool
    {
        public static void ResetAttribute(object obj)
        {
            var type = obj.GetType();

            foreach (var field in type.GetFields())
            {
                var resetAttribute = field.GetCustomAttributes(typeof(RdResetAttribute), true)
                    as RdResetAttribute[];

                if (resetAttribute.Length == 0) continue;

                var defaultValue = resetAttribute[0].DefaultValue;
                Debug.Log("重置 " + field.Name);
                if (defaultValue == null)
                {
                    Debug.Log("重置为默认值");
                    if (field.FieldType == typeof(string)) // 字符串类型重置为null
                    {
                        field.SetValue(obj, null);
                    }
                    else if (field.FieldType == typeof(int) ||
                             field.FieldType == typeof(float) ||
                             field.FieldType == typeof(double) ||
                             field.FieldType == typeof(long) ||
                             field.FieldType == typeof(short) ||
                             field.FieldType == typeof(byte) ||
                             field.FieldType == typeof(uint) ||
                             field.FieldType == typeof(ulong) ||
                             field.FieldType == typeof(ushort) ||
                             field.FieldType == typeof(sbyte))
                    {
                        field.SetValue(obj, 0); // 数值型重置为0
                    }
                    else if (field.FieldType == typeof(bool)) // 布尔类型重置为false
                    {
                        field.SetValue(obj, false);
                    }
                    else if (field.FieldType.IsArray) // 数组重置为空数组
                    {
                        field.SetValue(obj, Array.CreateInstance(field.FieldType.GetElementType(), 0));
                    }
                    else if (field.FieldType.IsGenericType &&
                             field.FieldType.GetGenericTypeDefinition() == typeof(List<>)) // 列表重置为空列表
                    {
                        field.SetValue(obj, Activator.CreateInstance(field.FieldType));
                    }
                    else if (field.FieldType.IsGenericType &&
                             field.FieldType.GetGenericTypeDefinition() == typeof(Dictionary<,>)) // 字典重置为空字典
                    {
                        field.SetValue(obj, Activator.CreateInstance(field.FieldType));
                    }
                    else // 其他类型重置为null
                    {
                        Debug.Log("未兼容的类型，重置为null");
                        field.SetValue(obj, null);
                    }
                }
                else
                {
                    Debug.Log("重置为自定义默认值");
                    field.SetValue(obj, defaultValue);
                }
            }
        }
    }
}