using NCC.Dependency;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Dynamic;
using System.Linq;
using System.Reflection;

namespace NCC.Common.Extension
{
    /// <summary>
    /// 基类型<see cref="Object"/>扩展辅助操作类
    /// </summary>
    [SuppressSniffer]
    public static class ObjectExtensions
    {
        #region 公共方法

        /// <summary>
        /// 把对象类型转化为指定类型
        /// </summary>
        /// <typeparam name="T"> 动态类型 </typeparam>
        /// <param name="value"> 要转化的源对象 </param>
        /// <returns> 转化后的指定类型的对象，转化失败引发异常。 </returns>
        public static T CastTo<T>(this object value)
        {
            if (value == null && default(T) == null)
            {
                return default(T);
            }
            if (value.GetType() == typeof(T))
            {
                return (T)value;
            }
            object result = CastTo(value, typeof(T));
            return (T)result;
        }

        /// <summary>
        /// 把对象类型转化为指定类型，转化失败时返回指定的默认值
        /// </summary>
        /// <typeparam name="T"> 动态类型 </typeparam>
        /// <param name="value"> 要转化的源对象 </param>
        /// <param name="defaultValue"> 转化失败返回的指定默认值 </param>
        /// <returns> 转化后的指定类型对象，转化失败时返回指定的默认值 </returns>
        public static T CastTo<T>(this object value, T defaultValue)
        {
            try
            {
                return CastTo<T>(value);
            }
            catch (Exception)
            {
                return defaultValue;
            }
        }

        /// <summary>
        /// 判断当前值是否介于指定范围内
        /// </summary>
        /// <typeparam name="T"> 动态类型 </typeparam>
        /// <param name="value"> 动态类型对象 </param>
        /// <param name="start"> 范围起点 </param>
        /// <param name="end"> 范围终点 </param>
        /// <param name="leftEqual"> 是否可等于上限（默认等于） </param>
        /// <param name="rightEqual"> 是否可等于下限（默认等于） </param>
        /// <returns> 是否介于 </returns>
        public static bool IsBetween<T>(this IComparable<T> value, T start, T end, bool leftEqual = true, bool rightEqual = true) where T : IComparable
        {
            bool flag = leftEqual ? value.CompareTo(start) >= 0 : value.CompareTo(start) > 0;
            return flag && (rightEqual ? value.CompareTo(end) <= 0 : value.CompareTo(end) < 0);
        }

        /// <summary>
        /// 判断当前值是否介于指定范围内
        /// </summary>
        /// <typeparam name="T"> 动态类型 </typeparam>
        /// <param name="value"> 动态类型对象 </param>
        /// <param name="min">范围小值</param>
        /// <param name="max">范围大值</param>
        /// <param name="minEqual">是否可等于小值（默认等于）</param>
        /// <param name="maxEqual">是否可等于大值（默认等于）</param>
        public static bool IsInRange<T>(this IComparable<T> value, T min, T max, bool minEqual = true, bool maxEqual = true) where T : IComparable
        {
            bool flag = minEqual ? value.CompareTo(min) >= 0 : value.CompareTo(min) > 0;
            return flag && (maxEqual ? value.CompareTo(max) <= 0 : value.CompareTo(max) < 0);
        }

        /// <summary>
        /// 是否存在于
        /// </summary>
        public static bool IsIn<T>(this T value, params T[] source)
        {
            return source.Contains(value);
        }

        /// <summary>
        /// 将对象[主要是匿名对象]转换为dynamic
        /// </summary>
        public static dynamic ToDynamic(this object value)
        {
            IDictionary<string, object> expando = new ExpandoObject();
            Type type = value.GetType();
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(type);
            foreach (PropertyDescriptor property in properties)
            {
                var val = property.GetValue(value);
                if (property.PropertyType.FullName != null && property.PropertyType.FullName.StartsWith("<>f__AnonymousType"))
                {
                    dynamic dval = val.ToDynamic();
                    expando.Add(property.Name, dval);
                }
                else
                {
                    expando.Add(property.Name, val);
                }
            }
            return (ExpandoObject)expando;
        }

        private static readonly ConcurrentDictionary<Type, ConcurrentDictionary<PropertyInfo, ValidationAttribute[]>> ValidationDict
            = new ConcurrentDictionary<Type, ConcurrentDictionary<PropertyInfo, ValidationAttribute[]>>();

        #endregion
    }
}