using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Net;
using System.Security.Cryptography;
using System.Text;

namespace FNZCM.ConHost
{
    internal static class ExtensionMethods
    {
       

        public static void WriteTextUtf8(this HttpListenerContext context, string content, string contentType = Const.TextHtml)
        {
            var bytes = Encoding.UTF8.GetBytes(content);
            context.Response.ContentEncoding = Encoding.UTF8;
            context.Response.ContentType = contentType;

            if (true == context.Request.Headers["Accept-Encoding"]?.Contains("gzip"))
            {
                context.Response.AddHeader("Content-Encoding", "gzip");

                var memoryStream = new MemoryStream(bytes);
                var gZipStream = new GZipStream(context.Response.OutputStream, CompressionMode.Compress, false);
                memoryStream.CopyTo(gZipStream);
                gZipStream.Flush();
            }
            else
            {
                context.Response.OutputStream.Write(bytes);
            }
        }

        public static string ToMd5(this string s)
        {
            var bytes = Encoding.UTF8.GetBytes(s);
            var md5 = MD5.Create();
            var hash = md5.ComputeHash(bytes);
            var hex = string.Join("", hash.Select(p => p.ToString("x2")));
            return hex;
        }
    }
}