package com.orbekk;

import java.util.List;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Properties;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.widget.Toast;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.orbekk.same.DiscoveryListener;
import com.orbekk.same.NetworkNotificationListener;
import com.orbekk.same.SameController;
import com.orbekk.same.android.net.AndroidBroadcasterFactory;
import com.orbekk.same.android.net.Broadcaster;
import com.orbekk.same.config.Configuration;

public class SameService extends Service {
    public final static int DISPLAY_MESSAGE = 1;
    public final static int SEARCH_NETWORKS = 2;

    public final static String AVAILABLE_NETWORKS_UPDATE =
            "com.orbekk.same.SameService.action.AVAILABLE_NETWORKS_UPDATE";
    public final static String AVAILABLE_NETWORKS =
            "com.orbekk.same.SameService.action.AVAILABLE_NETWORKS";

    final static int PORT = 15066;
    final static int SERVICE_PORT = 15068;
    
    private Logger logger = LoggerFactory.getLogger(getClass());
    private Thread discoveryThread = null;
    private SameController sameController = null;
    private Configuration configuration = null;
    
    /** This class should go away >:-/ */
    public final class DiscoveryThread extends Thread {
        Broadcaster broadcast;
        DiscoveryListener listener;
        
        public DiscoveryThread(DiscoveryListener listener) {
            broadcast = new Broadcaster(SameService.this);
            this.listener = listener;
        }
        
        @Override public void run() {
            while (!Thread.interrupted()) {
                DatagramPacket packet = broadcast.receiveBroadcast(PORT);
                String content = new String(packet.getData(), 0, packet.getLength());
                String[] words = content.split(" ");
                
                if (!content.startsWith("Discover") || content.length() < 2) {
                    logger.warn("Invalid discovery message: {}", content);
                    continue;
                }
                
                String port = words[1];
                String url = "http://" + packet.getAddress().getHostAddress() +
                        ":" + port + "/ClientService.json";
                listener.discover(url);
                
                Message message = Message.obtain();
                message.obj = "New client: " + url;
                toastHandler.sendMessage(message);
            }
        }
        
        @Override public void interrupt() {
            super.interrupt();
            broadcast.interrupt();
        }
    }
    
    private NetworkNotificationListener networkListener =
            new NetworkNotificationListener() {
        @Override
        public void notifyNetwork(String networkName, String masterUrl) {
            Message message = Message.obtain();
            message.obj = "notifyNetwork(" + networkName + ")";
            toastHandler.sendMessage(message);
        }
    };
    
    private Handler toastHandler = new Handler() {
        @Override public void handleMessage(Message message) {
            Toast.makeText(SameService.this,
                    (String)message.obj, Toast.LENGTH_SHORT)
                            .show();
            logger.info("Display toast: {}", (String)message.obj);
        }
    };
    
    
    class InterfaceHandler extends Handler {
        @Override public void handleMessage(Message message) {
            switch (message.what) {
                case DISPLAY_MESSAGE:
                    Toast.makeText(SameService.this,
                        (String)message.obj, Toast.LENGTH_SHORT)
                            .show();
                            
                    Intent intent = new Intent(AVAILABLE_NETWORKS_UPDATE);
                    ArrayList<String> networkList = new ArrayList<String>();
                    networkList.add("FirstNetwork");
                    intent.putStringArrayListExtra(AVAILABLE_NETWORKS,
                        networkList);
                    sendBroadcast(intent);
                    break;
                case SEARCH_NETWORKS:
                    logger.info("SEARCH_NETWORKS");
                    sameController.searchNetworks();
                    break;
                default:
                    super.handleMessage(message);
            }
        }
    }
    
    private final Messenger messenger = new Messenger(new InterfaceHandler());
    
    private void createNetwork() {
        if (discoveryThread == null) {
            synchronized (this) {
                discoveryThread = new DiscoveryThread(sameController.getClient());
                discoveryThread.start();
            }
            
        }
    }
    
    private void initializeConfiguration() {
        Properties properties = new Properties();
        properties.setProperty("port", ""+SERVICE_PORT);
        properties.setProperty("localIp",
                new Broadcaster(this).getWlanAddress().getHostAddress());
        properties.setProperty("masterUrl", "http://10.0.0.6:10010/MasterService.json");
        configuration = new Configuration(properties);
    }
    
    private void sendBroadcastDiscovery(InetAddress ip) {
        Broadcaster broadcaster = new Broadcaster(this);
        String message = "Discover " + (PORT + 2);
        byte[] data = message.getBytes();
        if (ip.equals(broadcaster.getBroadcastAddress())) {
            broadcaster.sendUdpData(data, ip, PORT);
        } else {
            String remoteAddress =
                    String.format("http://%s:%s/ClientService.json",
                    		ip.getHostAddress(), PORT + 2);
            sameController.getClient().sendDiscoveryRequest(
                    remoteAddress);
        }
    }
    
    private void searchNetworks(InetAddress ip) {
        sameController.getClient().setNetworkListener(
                new NetworkNotificationListener() {
                    @Override
                    public void notifyNetwork(String networkName, String masterUrl) {
                        Message message = Message.obtain();
                        message.obj = "notifyNetwork(" + networkName + ", " +
                                    masterUrl;
                        toastHandler.sendMessage(message);
                    }
                });
        sendBroadcastDiscovery(ip);
    }
    
    @Override
    public IBinder onBind(Intent intent) {
        return messenger.getBinder();
    }
    
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        logger.info("onStartCommand()");
        
        if (sameController == null) {
            initializeConfiguration();
            sameController = SameController.create(
                    new AndroidBroadcasterFactory(this),
                    configuration);
            try {
                sameController.start();
                sameController.getClient().setNetworkListener(networkListener);
            } catch (Exception e) {
                logger.error("Failed to start server", e);
                return START_STICKY;
            }
        }
        
        // TODO: Move this to the bound interface.
        if (intent.getAction().equals("create")) {
            createNetwork();
        } else if (intent.getAction().equals("join")) {
            String masterUrl = intent.getExtras().getString("masterUrl"); 
            sameController.joinNetwork(masterUrl);
        }
        return START_STICKY;
    }
    
    @Override
    public void onDestroy() {
        Toast.makeText(this, "service stopped", Toast.LENGTH_SHORT).show();
        if (discoveryThread != null) {
            discoveryThread.interrupt();
        }
        if (sameController != null) {
            sameController.stop();
        }
    }

}