using System;
using System.Buffers;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace JT809.Protocol.Extensions
{
    /// <summary>
    /// 
    /// </summary>
    public static  partial class JT809BinaryExtensions
    {
        public static string ToHexString(this byte[] source,string separator="")
        {
            return string.Join(separator, source.Select(s => s.ToString("X2")));
        }

        public static int WriteHexStringLittle(byte[] bytes, int offset, string data, int len)
        {
            if (data == null) data = "";
            data = data.Replace(" ", "");
            int startIndex = 0;
            if (data.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
            {
                startIndex = 2;
            }
            int length = len;
            if (length == -1)
            {
                length = (data.Length - startIndex) / 2;
            }
            int noOfZero = length * 2 + startIndex - data.Length;
            if (noOfZero > 0)
            {
                data = data.Insert(startIndex, new string('0', noOfZero));
            }
            int byteIndex = 0;
            while (startIndex < data.Length && byteIndex < length)
            {
                bytes[offset+byteIndex] = Convert.ToByte(data.Substring(startIndex, 2), 16);
                startIndex += 2;
                byteIndex++;
            }
            return length;
        }

        /// <summary>
        /// 16进制字符串转16进制数组
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        public static byte[] ToHexBytes(this string hexString)
        {
            hexString = hexString.Replace(" ", "");
            byte[] buf = new byte[hexString.Length / 2];
            ReadOnlySpan<char> readOnlySpan = hexString.AsSpan();
            for (int i = 0; i < hexString.Length; i++)
            {
                if (i % 2 == 0)
                {
                    buf[i / 2] = Convert.ToByte(readOnlySpan.Slice(i, 2).ToString(), 16);
                }
            }
            return buf;
        }

        public static string ReadNumber(this byte value, string format = "X2")
        {
            return value.ToString(format);
        }
        public static string ReadNumber(this int value, string format = "X8")
        {
            return value.ToString(format);
        }
        public static string ReadNumber(this uint value, string format = "X8")
        {
            return value.ToString(format);
        }
        public static string ReadNumber(this long value, string format = "X16")
        {
            return value.ToString(format);
        }
        public static string ReadNumber(this ulong value, string format = "X16")
        {
            return value.ToString(format);
        }
        public static string ReadNumber(this short value, string format = "X4")
        {
            return value.ToString(format);
        }
        public static string ReadNumber(this ushort value, string format = "X4")
        {
            return value.ToString(format);
        }
        public static ReadOnlySpan<char> ReadBinary(this ushort value)
        {
            return System.Convert.ToString(value, 2).PadLeft(16, '0').AsSpan();
        }
        public static ReadOnlySpan<char> ReadBinary(this short value)
        {
            return System.Convert.ToString(value, 2).PadLeft(16, '0').AsSpan();
        }
        public static ReadOnlySpan<char> ReadBinary(this uint value)
        {
            return System.Convert.ToString(value, 2).PadLeft(32, '0').AsSpan();
        }
        public static ReadOnlySpan<char> ReadBinary(this int value)
        {
            return System.Convert.ToString(value, 2).PadLeft(32, '0').AsSpan();
        }
        public static ReadOnlySpan<char> ReadBinary(this byte value)
        {
            return System.Convert.ToString(value, 2).PadLeft(8, '0').AsSpan();
        }
    }
}