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using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Collections;
using System.IO;

public class DaemonConnection {
    private TcpClient tc;
    private bool running;
    private string host;
    private int port;
    private NetworkStream ns;
    
    const byte DEBUG_LEVEL = 2; //0, 1, 2, 3
    
    private Queue canPackets = Queue.Synchronized(new Queue());
    
    public DaemonConnection() {
    }
    
    public void flushData() {
        canPackets.Clear();
    }
    
    public bool init(string host, int port) {
        //connect
        bool success = false;
        try {
            tc = new TcpClient();
            tc.Connect(host, port);
            ns = tc.GetStream();
            Console.WriteLine("Connected to host " + host + " on port " + port);
            success = true;
            running = true;
            
            Thread t = new Thread(thread);
            t.Start();
            
        } catch {
            Console.WriteLine("Unknown error when connecting to host " + host + " on port " + port);
        }
        return success;
    }

    public bool getData(out CanPacket cp) {
        cp = null;
        if (canPackets.Count>0) {
            cp = (CanPacket)canPackets.Dequeue();
            return true;
        }
        return false;
    }
    
    public void thread() {
        byte[] data = new byte[1024];
        int recv;
        while (running) {
            Thread.Sleep(20);
            //Console.Write(".");
            if (ns.DataAvailable) {
                recv = ns.Read(data, 0, data.Length);
                if (recv == 0)
                    break;
                
                string tcpdata = Encoding.ASCII.GetString(data, 0, recv);
                if (tcpdata.Length>3) {
                    CanPacket cp = new CanPacket(tcpdata.Substring(4));
                    canPackets.Enqueue(cp);
                    //Console.WriteLine(cp.toRawString());
                }
            }
        }
        
        ns.Close();
        tc.Close();
    }
    
    public void stop() {
        running = false;
    }
    
    public void sendCanPacket(CanPacket cp) {
        if (running) {
            try {
                byte[] data = new byte[1024];
                
                data = Encoding.ASCII.GetBytes(cp.toRawString()+"\n");
                ns.Write(data, 0, data.Length);
            }
            catch (Exception) {
                Console.WriteLine("Unknown error occured when trying to send data to host");
                running = false;
            }
        }
    }

}