using Newtonsoft.Json.Linq;
using S7.Net.Types;
using System;
using System.Collections.Generic;
using System.ComponentModel.Design;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace BPASmartClient.S7Net
{
    public static class EntityClassResolution
    {
        private static IEnumerable<PropertyInfo> GetAccessableProperties(Type classType)
        {
            return from p in classType.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.SetProperty)
                   where p.GetSetMethod() != null
                   select p;
        }

        private static double GetIncreasedNumberOfBytes(double numBytes, Type type, PropertyInfo propertyInfo)
        {
            switch (type.Name)
            {
                case "Boolean":
                    numBytes += 0.125;
                    break;
                case "Byte":
                    numBytes += 1.0;
                    break;
                case "Int16":
                case "UInt16":
                case "Ushort":
                case "Short":
                    numBytes += 2.0;
                    break;
                case "Int32":
                case "UInt32":
                case "Single":
                case "float":
                    numBytes += 4.0;
                    break;
                case "Double":
                    numBytes += 8.0;
                    break;
                case "String":
                    //numBytes += 256.0;
                    double len = 256.0;
                    if (propertyInfo.CustomAttributes.Count() > 0)
                    {
                        var tempLen = propertyInfo.GetCustomAttribute<SiemensAttribute>();
                        if (tempLen != null) len = Convert.ToDouble(tempLen.Len) + 2.0;
                    }
                    numBytes += len;
                    break;
                default:
                    if (type.IsClass) IncrementToEven(ref numBytes);
                    else if (!type.IsPrimitive && !type.IsEnum && type.IsValueType) IncrementToEven(ref numBytes);
                    numBytes = GetClassSize(Activator.CreateInstance(type), numBytes, isInnerProperty: true);
                    break;
            }

            return numBytes;
        }

        /// <summary>
        /// 获取实体类的字节大小
        /// </summary>
        /// <param name="instance"></param>
        /// <param name="numBytes"></param>
        /// <param name="isInnerProperty"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        public static double GetClassSize(object instance, double numBytes = 0.0, bool isInnerProperty = false)
        {
            foreach (PropertyInfo accessableProperty in GetAccessableProperties(instance.GetType()))
            {
                if (accessableProperty.PropertyType.IsArray)
                {
                    Type elementType = accessableProperty.PropertyType.GetElementType();
                    Array array = (Array)accessableProperty.GetValue(instance, null);
                    if (array.Length <= 0)
                    {
                        throw new Exception("Cannot determine size of class, because an array is defined which has no fixed size greater than zero.");
                    }

                    IncrementToEven(ref numBytes);
                    for (int i = 0; i < array.Length; i++)
                    {
                        numBytes = GetIncreasedNumberOfBytes(numBytes, elementType, accessableProperty);
                    }
                }
                else
                {
                    numBytes = GetIncreasedNumberOfBytes(numBytes, accessableProperty.PropertyType, accessableProperty);
                }
            }

            if (!isInnerProperty)
            {
                numBytes = Math.Ceiling(numBytes);
                if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                {
                    numBytes += 1.0;
                }
            }

            return numBytes;
        }

        private static object? GetPropertyValue(Type propertyType, byte[] bytes, PropertyInfo propertyInfo, ref double numBytes)
        {
            object obj = null;
            switch (propertyType.Name)
            {
                case "Boolean":
                    {
                        int num = (int)Math.Floor(numBytes);
                        int num2 = (int)((numBytes - (double)num) / 0.125);
                        obj = (((bytes[num] & (int)Math.Pow(2.0, num2)) == 0) ? ((object)false) : ((object)true));
                        numBytes += 0.125;
                        break;
                    }
                case "Byte":
                    numBytes = Math.Ceiling(numBytes);
                    obj = bytes[(int)numBytes];
                    numBytes += 1.0;
                    break;
                case "Int16":
                    numBytes = Math.Ceiling(numBytes);
                    if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                    {
                        numBytes += 1.0;
                    }

                    obj = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]).ConvertToShort();
                    numBytes += 2.0;
                    break;
                case "UInt16":
                    numBytes = Math.Ceiling(numBytes);
                    if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                    {
                        numBytes += 1.0;
                    }

                    obj = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
                    numBytes += 2.0;
                    break;
                case "Int32":
                    numBytes = Math.Ceiling(numBytes);
                    if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                    {
                        numBytes += 1.0;
                    }

                    obj = DWord.FromBytes(bytes[(int)numBytes + 3], bytes[(int)numBytes + 2], bytes[(int)numBytes + 1], bytes[(int)numBytes]).ConvertToInt();
                    numBytes += 4.0;
                    break;
                case "UInt32":
                    numBytes = Math.Ceiling(numBytes);
                    if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                    {
                        numBytes += 1.0;
                    }

                    obj = DWord.FromBytes(bytes[(int)numBytes], bytes[(int)numBytes + 1], bytes[(int)numBytes + 2], bytes[(int)numBytes + 3]);
                    numBytes += 4.0;
                    break;
                case "Single":
                    numBytes = Math.Ceiling(numBytes);
                    if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                    {
                        numBytes += 1.0;
                    }

                    obj = Real.FromByteArray(new byte[4]
                    {
                    bytes[(int)numBytes],
                    bytes[(int)numBytes + 1],
                    bytes[(int)numBytes + 2],
                    bytes[(int)numBytes + 3]
                    });
                    numBytes += 4.0;
                    break;
                case "Double":
                    {
                        numBytes = Math.Ceiling(numBytes);
                        if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                        {
                            numBytes += 1.0;
                        }

                        byte[] array = new byte[8];
                        Array.Copy(bytes, (int)numBytes, array, 0, 8);
                        obj = LReal.FromByteArray(array);
                        numBytes += 8.0;
                        break;
                    }
                case "String":
                    //byte[] sarray = new byte[256];
                    //Array.Copy(bytes, (int)numBytes, sarray, 0, 256);
                    //obj = GetGb2312()?.GetString(sarray).Trim().Replace(" ", "").Replace("\n", "");
                    //numBytes += 256.0;

                    int len = 256;
                    if (propertyInfo.CustomAttributes.Count() > 0)
                    {
                        var tempLen = propertyInfo.GetCustomAttribute<SiemensAttribute>();
                        if (tempLen != null) len = tempLen.Len + 2;
                    }

                    byte[] sarray = new byte[len];
                    Array.Copy(bytes, (int)numBytes, sarray, 0, len);
                    List<byte> bytes1 = new List<byte>();
                    if (sarray.Length > 2)
                        for (int i = 2; i < sarray.Length; i++) if (sarray[i] > 0) bytes1.Add(sarray[i]);
                    //obj = GetGb2312()?.GetString(bytes1.ToArray()).Trim().Replace(" ", "").Replace("\n", "");
                    obj = bytes1.ToArray().ToStringb().Trim().Replace(" ", "").Replace("\n", "");
                    numBytes += len;
                    break;
                default:
                    {
                        numBytes = Math.Ceiling(numBytes);
                        if (numBytes / 2.0 - Math.Floor(numBytes / 2.0) > 0.0)
                        {
                            numBytes += 1.0;
                        }
                        object obj2 = Activator.CreateInstance(propertyType);
                        numBytes = FromBytes(obj2, bytes, numBytes);
                        obj = obj2;
                        break;
                    }
            }

            return obj;
        }

        private static Encoding GetGb2312()
        {
            //获取指定的编码不存在的时候需要安装 System.Text.Encoding.CodePages nuget包 
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
            return Encoding.GetEncoding("gb2312");
        }


        //public static Encoding GetGb2312(this Encoding encoding)
        //{
        //    Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
        //    return Encoding.GetEncoding("gb2312");
        //}

        public static byte[] ToArrays(this string value)
        {
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
            return Encoding.GetEncoding("gb2312").GetBytes(value);
        }

        public static string ToStringb(this byte[] value)
        {
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
            return Encoding.GetEncoding("gb2312").GetString(value);
        }


        public static double FromBytes(object sourceClass, byte[] bytes, double numBytes = 0.0, bool isInnerClass = false)
        {
            if (bytes == null)
            {
                return numBytes;
            }

            foreach (PropertyInfo accessableProperty in GetAccessableProperties(sourceClass.GetType()))
            {
                if (accessableProperty.PropertyType.IsArray)
                {
                    Array array = (Array)accessableProperty.GetValue(sourceClass, null);
                    IncrementToEven(ref numBytes);
                    Type elementType = accessableProperty.PropertyType.GetElementType();
                    for (int i = 0; i < array.Length; i++)
                    {
                        if (!(numBytes < (double)bytes.Length))
                        {
                            break;
                        }

                        array.SetValue(GetPropertyValue(elementType, bytes, accessableProperty, ref numBytes), i);
                    }
                }
                else
                {
                    accessableProperty.SetValue(sourceClass, GetPropertyValue(accessableProperty.PropertyType, bytes, accessableProperty, ref numBytes), null);
                }
            }

            return numBytes;
        }

        private static double SetBytesFromProperty(object propertyValue, byte[] bytes, double numBytes, PropertyInfo propertyInfo)
        {
            int num = 0;
            int num2 = 0;
            byte[] array = null;
            switch (propertyValue.GetType().Name)
            {
                case "Boolean":
                    num = (int)Math.Floor(numBytes);
                    num2 = (int)((numBytes - (double)num) / 0.125);
                    if ((bool)propertyValue)
                    {
                        bytes[num] |= (byte)Math.Pow(2.0, num2);
                    }
                    else
                    {
                        bytes[num] &= (byte)(~(byte)Math.Pow(2.0, num2));
                    }

                    numBytes += 0.125;
                    break;
                case "Byte":
                    numBytes = (int)Math.Ceiling(numBytes);
                    num = (int)numBytes;
                    bytes[num] = (byte)propertyValue;
                    numBytes += 1.0;
                    break;
                case "Int16":
                    array = Int.ToByteArray((short)propertyValue);
                    break;
                case "UInt16":
                    array = Word.ToByteArray((ushort)propertyValue);
                    break;
                case "Int32":
                    array = DInt.ToByteArray((int)propertyValue);
                    break;
                case "UInt32":
                    array = DWord.ToByteArray((uint)propertyValue);
                    break;
                case "Single":
                    array = Real.ToByteArray((float)propertyValue);
                    break;
                case "Double":
                    array = LReal.ToByteArray((double)propertyValue);
                    break;
                case "String":
                    //array = new byte[256];
                    //var res = GetGb2312()?.GetBytes(propertyValue?.ToString());
                    //for (int i = 0; i < res?.Length; i++) { array[i] = res[i]; }
                    int len = 256;
                    if (propertyInfo.CustomAttributes.Count() > 0)
                    {
                        var tempLen = propertyInfo.GetCustomAttribute<SiemensAttribute>();
                        if (tempLen != null) len = tempLen.Len + 2;
                    }
                    array = new byte[len];
                    //var res = GetGb2312()?.GetBytes(propertyValue?.ToString());
                    var res = propertyValue?.ToString()?.ToArrays();
                    if (array.Length > 2) array[0] = (byte)(len - 2); array[1] = (byte)res.Length;

                    for (int i = 0; i < res?.Length; i++)
                    {
                        int index = i + 2;
                        if (index < array.Length)
                            array[index] = res[i];
                    }
                    break;
                default:
                    numBytes = ToBytes(propertyValue, bytes, numBytes);
                    //if (propertyValue.GetType().IsClass) IncrementToEven(ref numBytes);
                    break;
            }

            if (array != null)
            {
                IncrementToEven(ref numBytes);
                num = (int)numBytes;
                for (int i = 0; i < array.Length; i++)
                {
                    bytes[num + i] = array[i];
                }

                numBytes += (double)array.Length;
            }

            return numBytes;
        }


        public static double ToBytes(object sourceClass, byte[] bytes, double numBytes = 0.0)
        {
            foreach (PropertyInfo accessableProperty in GetAccessableProperties(sourceClass.GetType()))
            {
                if (accessableProperty.PropertyType.IsArray)
                {
                    Array array = (Array)accessableProperty.GetValue(sourceClass, null);
                    IncrementToEven(ref numBytes);
                    accessableProperty.PropertyType.GetElementType();
                    for (int i = 0; i < array.Length; i++)
                    {
                        if (!(numBytes < (double)bytes.Length))
                        {
                            break;
                        }
                        numBytes = SetBytesFromProperty(array.GetValue(i), bytes, numBytes, accessableProperty);
                    }
                }
                else
                {
                    numBytes = SetBytesFromProperty(accessableProperty.GetValue(sourceClass, null), bytes, numBytes, accessableProperty);
                }
            }
            return numBytes;
        }

        private static void IncrementToEven(ref double numBytes)
        {
            numBytes = Math.Ceiling(numBytes);
            if (numBytes % 2.0 > 0.0)
            {
                numBytes += 1.0;
            }
        }
    }
}