using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace EGFramework{
    public class EGHttpServer : IEGFramework, IModule
    {
        public HttpListener HttpServer { set; get; }
        public Encoding StringEncoding { set; get; } = Encoding.UTF8;

        public Dictionary<string,HttpListenerResponse> ResponsePools { set; get; } = new Dictionary<string, HttpListenerResponse>();
        public void Init()
        {

        }

        /// <summary>
        /// if you are in Win7 or newest system, you should add prefix in urlacl by cmd for example: netsh http add urlacl url=http://+:6555/index/ user=Everyone
        /// </summary>
        /// <param name="prefix"></param>
        /// <returns></returns>
        public async void Listen(string prefix){
            if(!HttpListener.IsSupported){
                return;
            }
            if(HttpServer == null){
                HttpServer = new HttpListener();
            }
            HttpServer.Prefixes.Add(prefix);
            if(!HttpServer.IsListening){
                HttpServer.Start();
                HttpListenerContext context = await HttpServer.GetContextAsync();

                HttpListenerRequest request = context.Request;
                string responseKey = "";
                switch (request.HttpMethod)
                {
                    case "POST":
                        {
                            Stream stream = context.Request.InputStream;
                            StreamReader reader = new StreamReader(stream, Encoding.UTF8);
                            byte[] postBuffer = new byte[stream.Length];
                            stream.Read(postBuffer,0,postBuffer.Length);
                            string postString = reader.ReadToEnd();
                            ResponseMsg receivedMsgs = new ResponseMsg(postString,postBuffer,"GET:"+context.User.ToString(), ProtocolType.HttpServer);
                            this.EGOnReceivedData(receivedMsgs);
                        }
                        break;
                    case "GET":
                        {
                            NameValueCollection data = request.QueryString;
                            Dictionary<string,string> getDic = data.AllKeys.ToDictionary(k=>k,k=>data[k]);
                            string getData = JsonConvert.SerializeObject(getDic);
                            byte[] getBuffer = StringEncoding.GetBytes(getData);
                            responseKey = "GET:"+this.GetTimeStamp().ToString();
                            ResponseMsg receivedMsgs = new ResponseMsg(getData,getBuffer,responseKey, ProtocolType.HttpServer);
                            this.EGOnReceivedData(receivedMsgs);
                        }
                        break;
                    case "PUT":
                        {
                            Stream stream = context.Request.InputStream;
                            StreamReader reader = new StreamReader(stream, Encoding.UTF8);
                            byte[] postBuffer = new byte[stream.Length];
                            stream.Read(postBuffer,0,postBuffer.Length);
                            string postData = reader.ReadToEnd();
                            ResponseMsg receivedMsgs = new ResponseMsg(postData,postBuffer,"PUT:"+context.User.ToString(), ProtocolType.HttpServer);
                            this.EGOnReceivedData(receivedMsgs);
                        }
                        break;
                    case "PATCH":
                        {
                            Stream stream = context.Request.InputStream;
                            StreamReader reader = new StreamReader(stream, Encoding.UTF8);
                            byte[] postBuffer = new byte[stream.Length];
                            stream.Read(postBuffer,0,postBuffer.Length);
                            string postData = reader.ReadToEnd();
                            ResponseMsg receivedMsgs = new ResponseMsg(postData,postBuffer,"PATCH:"+context.User.ToString(), ProtocolType.HttpServer);
                            this.EGOnReceivedData(receivedMsgs);
                        }
                        break;
                    case "DELETE":
                        {
                            NameValueCollection data = request.QueryString;
                            Dictionary<string,string> getDic = data.AllKeys.ToDictionary(k=>k,k=>data[k]);
                            string getData = JsonConvert.SerializeObject(getDic);
                            byte[] getBuffer = StringEncoding.GetBytes(getData);
                            ResponseMsg receivedMsgs = new ResponseMsg(getData,getBuffer,"DELETE:"+context.User.ToString(), ProtocolType.HttpServer);
                            this.EGOnReceivedData(receivedMsgs);
                        }
                        break;
                }
                HttpListenerResponse response = context.Response;
                response.AppendHeader("Access-Control-Allow-Origin", "*");
                response.AppendHeader("Access-Control-Allow-Credentials", "true");
                response.AppendHeader("Server", "MyIIS");
                response.StatusCode = 200;

                ResponsePools.Add("",response);
                
            }
        }

        public async void Response(string responseKey,string responseString = "",byte[] responseByte = null){
            #region 返回应答
            // Construct a response.
            byte[] buffer = StringEncoding.GetBytes(responseString);
            // Get a response stream and write the response to it.
            ResponsePools[responseKey].ContentLength64 = buffer.Length;
            System.IO.Stream output = ResponsePools[responseKey].OutputStream;
            await output.WriteAsync(buffer, 0, buffer.Length);
            // You must close the output stream.
            output.Close();
            #endregion
        }

        public IArchitecture GetArchitecture()
        {
            return EGArchitectureImplement.Interface;
        }

    }

    public static class CanGetEGHttpServerExtension{
        public static EGHttpServer EGHttpServer(this IEGFramework self){
            return self.GetModule<EGHttpServer>();
        }

        public static void EGHttpServerListen(this IEGFramework self ,string prefix){
            self.GetModule<EGHttpServer>().Listen(prefix);
        }
    }

}