using System;
using System.Text;
using DotNetty.Buffers;
using DotNetty.Codecs.Http;
using DotNetty.Common.Utilities;
using DotNetty.Transport.Channels;
using log4net;

namespace BrakeMachine.Brack
{
    public class HttpHandler: SimpleChannelInboundHandler<DefaultHttpRequest>
    {
        private static readonly ILog Log = LogManager.GetLogger(typeof(HttpHandler));

    static readonly AsciiString TypePlain = AsciiString.Cached("text/plain; charset=utf-8");
    static readonly AsciiString TypeJson = AsciiString.Cached("application/json; charset=utf-8");
    static readonly AsciiString OkLength = AsciiString.Cached(Encoding.UTF8.GetBytes("true").Length.ToString());
    static readonly AsciiString FailLength = AsciiString.Cached(Encoding.UTF8.GetBytes("false").Length.ToString());
    static readonly AsciiString ServerName = AsciiString.Cached("Netty");
    static readonly AsciiString ContentTypeEntity = HttpHeaderNames.ContentType;
    static readonly AsciiString DateEntity = HttpHeaderNames.Date;
    static readonly AsciiString ContentLengthEntity = HttpHeaderNames.ContentLength;
    static readonly AsciiString ServerEntity = HttpHeaderNames.Server;

    protected override void ChannelRead0(IChannelHandlerContext ctx, DefaultHttpRequest req)
    {
        Log.Info($"{req.Uri}, {req}");

        DefaultFullHttpResponse response = null;
        switch (req.Uri)
        {
              case "/Api/Manualsnap"://抓拍
                  BrackMgr.Manualsnap();
                  //this.WriteResponse(ctx, Unpooled.WrappedBuffer(Encoding.UTF8.GetBytes(closeRfid.ToString())), TypePlain, closeRfid?OkLength: FailLength);
                  break;
              default:
                  response = new DefaultFullHttpResponse(HttpVersion.Http11, HttpResponseStatus.NotFound, Unpooled.Empty, false);
                  ctx.WriteAndFlushAsync(response);
                  break;
        }


    }

    void WriteResponse(IChannelHandlerContext ctx, IByteBuffer buf, ICharSequence contentType,
        ICharSequence contentLength)
    {
        DateTime dateTime = DateTime.UtcNow;
        // Build the response object.
        var response = new DefaultFullHttpResponse(HttpVersion.Http11, HttpResponseStatus.OK, buf, false);
        HttpHeaders headers = response.Headers;
        headers.Set(ContentTypeEntity, contentType);
        headers.Set(ServerEntity, ServerName);
        headers.Set(DateEntity, AsciiString.Cached($"{dateTime.DayOfWeek}, {dateTime:dd MMM yyyy HH:mm:ss z}"));
        headers.Set(ContentLengthEntity, contentLength);

        // Close the non-keep-alive connection after the write operation is done.
        ctx.WriteAsync(response);
    }

    public override void ExceptionCaught(IChannelHandlerContext context, Exception exception) => context.CloseAsync();

    public override void ChannelReadComplete(IChannelHandlerContext context) => context.Flush();
    }
}