import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;

public class SingleThreadedActivity extends Activity {

  private EditText serverTextEditText;
	
  private ServerThread singleThreadedServer;
	
  private ServerTextContentWatcher serverTextContentWatcher = new ServerTextContentWatcher();
  private class ServerTextContentWatcher implements TextWatcher {

    @Override
    public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
    }
    
    @Override
    public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
      if (charSequence.toString().equals(Constants.SERVER_START)) {
        singleThreadedServer = new ServerThread();
        singleThreadedServer.startServer();
      }
      if (charSequence.toString().equals(Constants.SERVER_STOP)) {
        singleThreadedServer.stopServer();
      }
    }
    
    @Override
    public void afterTextChanged(Editable editable) {
    }
  
  }
  
  private class ServerThread extends Thread {
  
    private boolean isRunning;
    
    private ServerSocket serverSocket;
    
    public void startServer() {
      isRunning = true;
      start();
    }
    
    public void stopServer() {
      isRunning = false;
      new Thread(new Runnable() {
        @Override
        public void run() {
          try {
            if (serverSocket != null) {
              serverSocket.close();
            }
            Log.v(Constants.TAG, "stopServer() method invoked "+serverSocket);
          } catch(IOException ioException) {
            Log.e(Constants.TAG, "An exception has occurred: "+ioException.getMessage());
            if (Constants.DEBUG) {
              ioException.printStackTrace();
            }
          }
        }
      }).start();
    }
    
    @Override
    public void run() {
      try {
        serverSocket = new ServerSocket(Constants.SERVER_PORT);
        while (isRunning) {
          Socket socket = serverSocket.accept();
          Log.v(Constants.TAG, "Connection opened with "+socket.getInetAddress()+":"+socket.getLocalPort());
          PrintWriter printWriter = Utilities.getWriter(socket);
          printWriter.println(serverTextEditText.getText().toString());
          socket.close();
          Log.v(Constants.TAG, "Connection closed");
        }
      } catch (IOException ioException) {
        Log.e(Constants.TAG, "An exception has occurred: "+ioException.getMessage());
        if (Constants.DEBUG) {
          ioException.printStackTrace();
        }
      }
    }
  }
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_single_threaded);	
    
    serverTextEditText = (EditText)findViewById(R.id.server_text_edit_text);
    serverTextEditText.addTextChangedListener(serverTextContentWatcher);
  }

}