//------------------------------------------------------------------------------
//  此代码版权（除特别声明或在XREF结尾的命名空间的代码）归作者本人若汝棋茗所有
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//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
using System;
using System.Collections.Generic;

namespace TouchSocket.Core
{
    /// <summary>
    /// BytesExtension
    /// </summary>
    public static class BytesExtension
    {
        #region 字节数组扩展

        /// <summary>
        /// 转Base64。
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string ToBase64(this byte[] data)
        {
            return Convert.ToBase64String(data);
        }

        /// <summary>
        /// 索引包含数组。
        /// <para>
        /// 例如：在{0,1,2,3,1,2,3}中搜索{1,2}，则会返回list:[2,5]，均为最后索引的位置。
        /// </para>
        /// </summary>
        /// <param name="srcByteArray"></param>
        /// <param name="offset"></param>
        /// <param name="length"></param>
        /// <param name="subByteArray"></param>
        /// <returns></returns>
        public static List<int> IndexOfInclude(this byte[] srcByteArray, int offset, int length, byte[] subByteArray)
        {
            int subByteArrayLen = subByteArray.Length;
            List<int> indexes = new List<int>();
            if (length < subByteArrayLen)
            {
                return indexes;
            }
            int hitLength = 0;
            for (int i = offset; i < length; i++)
            {
                if (srcByteArray[i] == subByteArray[hitLength])
                {
                    hitLength++;
                }
                else
                {
                    hitLength = 0;
                }

                if (hitLength == subByteArray.Length)
                {
                    hitLength = 0;
                    indexes.Add(i);
                }
            }

            return indexes;
        }

        /// <summary>
        /// 索引第一个包含数组的索引位置，例如：在{0,1,2,3,1,2,3}中索引{2,3}，则返回3。
        /// <para>如果目标数组为null或长度为0，则直接返回offset的值</para>
        /// </summary>
        /// <param name="srcByteArray"></param>
        /// <param name="offset"></param>
        /// <param name="length"></param>
        /// <param name="subByteArray"></param>
        /// <returns></returns>
        public static int IndexOfFirst(this byte[] srcByteArray, int offset, int length, byte[] subByteArray)
        {
            if (length < subByteArray.Length)
            {
                return -1;
            }
            if (subByteArray == null || subByteArray.Length == 0)
            {
                return offset;
            }
            int hitLength = 0;
            for (int i = offset; i < length + offset; i++)
            {
                if (srcByteArray[i] == subByteArray[hitLength])
                {
                    hitLength++;
                }
                else
                {
                    hitLength = 0;
                }

                if (hitLength == subByteArray.Length)
                {
                    return i;
                }
            }

            return -1;
        }

        /// <summary>
        /// 字节数组转16进制字符
        /// </summary>
        /// <param name="buffer"></param>
        /// <param name="offset"></param>
        /// <param name="length"></param>
        /// <param name="splite"></param>
        /// <returns></returns>
        public static string ByBytesToHexString(this byte[] buffer, int offset, int length, string splite = default)
        {
            if (string.IsNullOrEmpty(splite))
            {
                return BitConverter.ToString(buffer, offset, length).Replace("-", string.Empty);
            }
            else
            {
                return BitConverter.ToString(buffer, offset, length).Replace("-", splite);
            }
        }

        #endregion 字节数组扩展
    }
}