using System;
using System.Net.Sockets;
using System.Threading;
using System.IO;
using sharp.jsonrpc.net;
using Newtonsoft.Json.Linq;
using sharp.cryptonote;

namespace SharpMining
{
	public class StratumConnection : JSONClient
	{
		delegate void threadsyncdelegate();

		StratumListener listener;
		Thread thread;
		bool shouldExit;

		public Guid UID { get; } = Guid.NewGuid();

		public CryptoNoteAddress Wallet { get; set; }
		public string WorkerID { get; set; }
		public int FixedDiff { get; set; }
		public string Agent { get; set; }

		public MiningPool Pool { get; private set; }

		public MiningJob CurrentJob { get; private set; }
		public MiningJob LastJob { get; private set; }

		public StratumConnection(StratumListener listener,Socket socket)
			:base(socket)
		{
			this.listener = listener;
			this.thread = new Thread(()=>run());
			this.thread.Start();
		}

		public new void Close(){
			Monitor.Enter(this);
			if (shouldExit){
				return;
			}
			shouldExit = true;
			Monitor.Wait(this);

			base.Close();

			Monitor.Exit(this);
		}

		private void run(){
			
			while (!ShouldExit){
				try
				{
					JToken token = readJSON();

					if (token["method"] != null)
					{
						methodCalled(token["method"].ToObject<string>(), token["id"].ToObject<UInt64>(), token["params"]);
					}
				} catch (IOException ioe){
					Close();
				} catch (Exception e){
					Console.WriteLine("StratumConnection: [{0}] Exception: {1}",UID.ToString(),e.ToString());
				}

			}

			if (Pool != null){
				Pool.WorkManager.OnNewBlockAvailable -= WorkManager_OnNewBlockAvailable;
			}

			Monitor.Enter(this);
			Monitor.PulseAll(this);
			Monitor.Exit(this);
		}

		private bool ShouldExit { get { Monitor.Enter(this); bool se = this.shouldExit; Monitor.Exit(this); return se; } }

		private new void writeJSON(JToken token){
			Monitor.Enter(this);
			base.writeJSON(token);
			Monitor.Exit(this);
		}

		private void methodCalled(string method,UInt64 id,JToken args){
			switch (method){
				case "login":
					rpcLogin(id,args);
					break;
				case "submit":
					rpcSubmit(id, args);
					break;
				default:
					writeJSONRPC(id, null, new JValue(String.Format("Method not implemented: {0}", method)));
					break;
			}
		}

		private string splitSuffix(char deli, ref string line)
		{
			return splitSuffix(deli, ref line, "");
		}
		private string splitSuffix(char deli, ref string line, string def){
			string result = def;
			int i = line.IndexOf(deli);
			if (i >= 0){
				result = line.Substring(i + 1);
				line = line.Substring(0, i);
			};
			return result;
		}

		private void rpcLogin(UInt64 id,JToken args){
			string username, passwd;

			Agent = args["agent"].ToObject<string>();

			username = args["login"].ToObject<string>();
			passwd = args["pass"].ToObject<string>();

			try {
				FixedDiff = int.Parse(splitSuffix('@', ref username,"0"));
				WorkerID = splitSuffix('.', ref username);
				Wallet = new CryptoNoteAddress(username);

				Pool = this.listener.getAssociatedPool(Wallet.CryptoNoteCoin);

				if (Pool == null){
					throw new Exception("No Pool for that coin available!");
				}

				MiningJob job = Pool.WorkManager.createJob();
				assignJob(job, false);

				Pool.WorkManager.OnNewBlockAvailable += WorkManager_OnNewBlockAvailable;

			} catch (Exception e){
				writeJSONRPC(id,null,new JValue(String.Format("An Exception occured ({0}: {1})",e.ToString(),e.Message)));
				Close();
			}

			Console.WriteLine("Miner connected: [{3}] Wallet: {0} WorkerID: {1} FixedDiff: {2}", Wallet, WorkerID, FixedDiff, UID.ToString());


			writeJSONRPC(id, new JObject(
				new JProperty("id", "555"),
				new JProperty("job", CurrentJob.toJSON(100))
			), null);
		}

		private void rpcSubmit(UInt64 id,JToken args)
		{
		}

		private bool assignJob(MiningJob job,bool transmit){
			LastJob = CurrentJob;
			CurrentJob = job;

			if (transmit){
				transmitCurrentJob();
			}

			return true;
		}

		public void transmitCurrentJob(){
            writeJSON(new JObject(
					new JProperty("jsonrpc", "2.0"),
					new JProperty("method","job"),
					new JProperty("params", CurrentJob.toJSON())
				));
		}

		void WorkManager_OnNewBlockAvailable(WorkManager workmanager)
		{
			assignJob( this.Pool.WorkManager.createJob(), true );
		}

		public override string ToString()
		{
			return string.Format("[StratumConnection: [{4}] MinerWallet={0}, WorkerID={1}, FixedDiff={2}, Agent={3}]", Wallet, WorkerID, FixedDiff, Agent, UID.ToString());
		}

	}
}