using System;
using System.ComponentModel;
using System.Reflection;

namespace DS.Module.Core.Extensions;

public static partial class Extensions
    {
        
        /// <summary>
        /// 判断类型是否为Nullable类型
        /// </summary>
        /// <param name="type"> 要处理的类型 </param>
        /// <returns> 是返回True，不是返回False </returns>
        public static bool IsNullableType(this Type type)
        {
            return ((type != null) && type.IsGenericType) && (type.GetGenericTypeDefinition() == typeof(Nullable<>));
        }

        /// <summary>
        /// 判断当前类型是否可由指定类型派生
        /// </summary>
        /// <typeparam name="TBaseType"></typeparam>
        /// <param name="type"></param>
        /// <param name="canAbstract"></param>
        /// <returns></returns>
        public static bool IsDeriveClassFrom<TBaseType>(this Type type, bool canAbstract = false)
        {
            return IsDeriveClassFrom(type, typeof(TBaseType), canAbstract);
        }

        /// <summary>
        /// 判断当前类型是否可由指定类型派生
        /// </summary>
        public static bool IsDeriveClassFrom(this Type type, Type baseType, bool canAbstract = false)
        {
            type.NotNull(nameof(type));
            baseType.NotNull(nameof(baseType));
            return type.IsClass && (!canAbstract && !type.IsAbstract) && type.IsBaseOn(baseType);
        }

        /// <summary>
        /// 返回当前类型是否是指定基类的派生类
        /// </summary>
        /// <param name="type">当前类型</param>
        /// <param name="baseType">要判断的基类型</param>
        /// <returns></returns>
        public static bool IsBaseOn(this Type type, Type baseType)
        {
            if (baseType.IsGenericTypeDefinition)
            {
                return baseType.IsGenericAssignableFrom(type);
            }
            return baseType.IsAssignableFrom(type);
        }

        /// <summary>
        /// 判断当前泛型类型是否可由指定类型的实例填充
        /// </summary>
        /// <param name="genericType">泛型类型</param>
        /// <param name="type">指定类型</param>
        /// <returns></returns>
        public static bool IsGenericAssignableFrom(this Type genericType, Type type)
        {
            genericType.NotNull(nameof(genericType));
            type.NotNull(nameof(type));

            if (!genericType.IsGenericType)
            {
                throw new ArgumentException("该功能只支持泛型类型的调用，非泛型类型可使用 IsAssignableFrom 方法。");
            }

            List<Type> allOthers = new List<Type> { type };
            if (genericType.IsInterface)
            {
                allOthers.AddRange(type.GetInterfaces());
            }

            foreach (var other in allOthers)
            {
                Type cur = other;
                while (cur != null)
                {
                    if (cur.IsGenericType)
                    {
                        cur = cur.GetGenericTypeDefinition();
                    }
                    if (cur.IsSubclassOf(genericType) || cur == genericType)
                    {
                        return true;
                    }
                    cur = cur.BaseType;
                }
            }
            return false;
        }

        /// <summary>
        /// 通过类型转换器获取Nullable类型的基础类型
        /// </summary>
        /// <param name="type"> 要处理的类型对象 </param>
        /// <returns> </returns>
        public static Type GetUnNullableType(this Type type)
        {
            if (IsNullableType(type))
            {
                NullableConverter nullableConverter = new NullableConverter(type);
                return nullableConverter.UnderlyingType;
            }
            return type;
        }

        ///// <summary>
        ///// 转换为Bool类型
        ///// </summary>
        ///// <param name="thisValue"></param>
        ///// <returns></returns>
        //public static bool ObjToBool(this object thisValue)
        //{
        //    bool reval = false;
        //    if (thisValue != null && thisValue != DBNull.Value && bool.TryParse(thisValue.ToString(), out reval))
        //    {
        //        return reval;
        //    }
        //    return reval;
        //}

        /// <summary>
        /// 判断是否IEnumerable、ICollection类型
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        // public static bool IsEnumerable(this Type type)
        // {
        //     return type.IsArray
        //            || type.GetInterfaces().Any(x => x == typeof(ICollection) || x == typeof(IEnumerable));
        // }

        /// <summary>
        /// 从类型成员获取指定Attribute特性
        /// </summary>
        /// <typeparam name="T">Attribute特性类型</typeparam>
        /// <param name="memberInfo">类型类型成员</param>
        /// <param name="inherit">是否从继承中查找</param>
        /// <returns>存在返回第一个，不存在返回null</returns>
        public static T GetAttribute<T>(this MemberInfo memberInfo, bool inherit = true) where T : Attribute
        {
            var attributes = memberInfo.GetCustomAttributes(typeof(T), inherit);
            return attributes.FirstOrDefault() as T;
        }

        /// <summary>
        /// 从类型成员获取指定Attribute特性
        /// </summary>
        /// <param name="type">Attribute特性类型</param>
        /// <param name="memberInfo">类型类型成员</param>
        /// <param name="inherit">是否从继承中查找</param>
        /// <returns>存在返回第一个，不存在返回null</returns>
        public static Type GetAttribute(this MemberInfo memberInfo, Type type, bool inherit = true)
        {
            var attributes = memberInfo.GetCustomAttributes(type, inherit);
            return attributes.FirstOrDefault() as Type;
        }

        /// <summary>
        /// 判断是否实体类型
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        // public static bool IsEntityType(this Type type)
        // {
        //     type.NotNull(nameof(type));
        //     return typeof(IEntityWithIdentity<>).IsGenericAssignableFrom(type) && !type.IsAbstract && !type.IsInterface;
        // }

        /// <summary>
        /// 转换为Guid类型
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static Guid ToGuid(this string str)
        {
            Guid guid;
            if (Guid.TryParse(str, out guid))
            {
                return guid;
            }
            else
            {
                return Guid.Empty;
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="thisValue"></param>
        /// <returns></returns>
        public static string ObjToString(this object thisValue)
        {
            if (thisValue != null) return thisValue.ToString().Trim();
            return "";
        }

        public static string ToDescription(this MemberInfo member)
        {
            DescriptionAttribute desc = member.GetCustomAttribute<DescriptionAttribute>();
            if (!desc.IsNull())
            {
                return desc.Description;
            }

            //显示名
            DisplayNameAttribute display = member.GetCustomAttribute<DisplayNameAttribute>();
            if (!display.IsNull())
            {
                return display.DisplayName;
            }
            return member.Name;
        }

        public static string GetKeySelector(this Type type, string keyName)
        {
            string[] propertyNames = keyName.Split(".");
            return propertyNames.Select(o => type.GetProperty(o)).FirstOrDefault()?.Name;
        }
    }