using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Dynamic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using System.Xml;

namespace CloudBuilder.Core.Extensions
{
    /// <summary>
    /// 基类型<see cref="Object"/>扩展辅助操作类
    /// </summary>
    public static class ObjectExtensions
    {
        #region 公共方法

        /// <summary>
        /// 把对象类型转换为指定类型
        /// </summary>
        /// <param name="value"></param>
        /// <param name="conversionType"></param>
        /// <returns></returns>
        public static object CastTo(this object value, Type conversionType)
        {
            if (value == null)
            {
                return null;
            }
            if (conversionType.IsNullableType())
            {
                conversionType = conversionType.GetUnNullableType();
            }
            if (conversionType.IsEnum)
            {
                return Enum.Parse(conversionType, value.ToString());
            }
            if (conversionType == typeof(Guid))
            {
                return Guid.Parse(value.ToString());
            }
            return Convert.ChangeType(value, conversionType);
        }

        /// <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;
        }

        /// <summary>
        /// 将 DateTimeOffset 转换成本地 DateTime
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static DateTime ConvertToDateTime(this DateTimeOffset dateTime)
        {
            if (dateTime.Offset.Equals(TimeSpan.Zero))
                return dateTime.UtcDateTime;
            if (dateTime.Offset.Equals(TimeZoneInfo.Local.GetUtcOffset(dateTime.DateTime)))
                return dateTime.ToLocalTime().DateTime;
            else
                return dateTime.DateTime;
        }

        /// <summary>
        /// 将 DateTimeOffset? 转换成本地 DateTime?
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static DateTime? ConvertToDateTime(this DateTimeOffset? dateTime)
        {
            return dateTime.HasValue ? dateTime.Value.ConvertToDateTime() : null;
        }

        /// <summary>
        /// 将 DateTime 转换成 DateTimeOffset
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static DateTimeOffset ConvertToDateTimeOffset(this DateTime dateTime)
        {
            return DateTime.SpecifyKind(dateTime, DateTimeKind.Local);
        }

        /// <summary>
        /// 将 DateTime? 转换成 DateTimeOffset?
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static DateTimeOffset? ConvertToDateTimeOffset(this DateTime? dateTime)
        {
            return dateTime.HasValue ? dateTime.Value.ConvertToDateTimeOffset() : null;
        }

        /// <summary>
        /// 将时间戳转换为 DateTime
        /// </summary>
        /// <param name="timestamp"></param>
        /// <returns></returns>
        internal static DateTime ConvertToDateTime(this long timestamp)
        {
            var timeStampDateTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            var digitCount = (int)Math.Floor(Math.Log10(timestamp) + 1);

            if (digitCount != 13 && digitCount != 10)
            {
                throw new ArgumentException("Data is not a valid timestamp format.");
            }

            return (digitCount == 13
                ? timeStampDateTime.AddMilliseconds(timestamp)  // 13 位时间戳
                : timeStampDateTime.AddSeconds(timestamp)).ToLocalTime();   // 10 位时间戳
        }

        /// <summary>
        /// 将 IFormFile 转换成 byte[]
        /// </summary>
        /// <param name="formFile"></param>
        /// <returns></returns>
        //public static byte[] ToByteArray(this IFormFile formFile)
        //{
        //    var fileLength = formFile.Length;
        //    using var stream = formFile.OpenReadStream();
        //    var bytes = new byte[fileLength];

        //    stream.Read(bytes, 0, (int)fileLength);

        //    return bytes;
        //}

        /// <summary>
        /// 将流保存到本地磁盘
        /// </summary>
        /// <param name="stream"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public static void CopyToSave(this Stream stream, string path)
        {
            // 空检查
            if (string.IsNullOrWhiteSpace(path)) throw new ArgumentNullException(nameof(path));

            using var fileStream = File.Create(path);
            stream.CopyTo(fileStream);
        }

        /// <summary>
        /// 将字节数组保存到本地磁盘
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public static void CopyToSave(this byte[] bytes, string path)
        {
            using var stream = new MemoryStream(bytes);
            stream.CopyToSave(path);
        }

        /// <summary>
        /// 将流保存到本地磁盘
        /// </summary>
        /// <param name="stream"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public static async Task CopyToSaveAsync(this Stream stream, string path)
        {
            // 空检查
            if (string.IsNullOrWhiteSpace(path)) throw new ArgumentNullException(nameof(path));

            using var fileStream = File.Create(path);
            await stream.CopyToAsync(fileStream);
        }

        /// <summary>
        /// 将字节数组保存到本地磁盘
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public static async Task CopyToSaveAsync(this byte[] bytes, string path)
        {
            using var stream = new MemoryStream(bytes);
            await stream.CopyToSaveAsync(path);
        }


        /// <summary>
        /// 判断类型是否实现某个泛型
        /// </summary>
        /// <param name="type">类型</param>
        /// <param name="generic">泛型类型</param>
        /// <returns>bool</returns>
        public static bool HasImplementedRawGeneric(this Type type, Type generic)
        {
            // 检查接口类型
            var isTheRawGenericType = type.GetInterfaces().Any(IsTheRawGenericType);
            if (isTheRawGenericType) return true;

            // 检查类型
            while (type != null && type != typeof(object))
            {
                isTheRawGenericType = IsTheRawGenericType(type);
                if (isTheRawGenericType) return true;
                type = type.BaseType;
            }

            return false;

            // 判断逻辑
            bool IsTheRawGenericType(Type type) => generic == (type.IsGenericType ? type.GetGenericTypeDefinition() : type);
        }
        #endregion
    }
}