import android.app.Activity;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.Handler;

import android.os.IBinder;

import android.os.Message;

import android.os.Messenger;

import android.os.RemoteException;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ProgressBar;

import android.widget.TextView;

public class DownloadActivity extends Activity{

	private Messenger messageService;

	private boolean boundToService = false;

	private TextView progress_sub;

	private ProgressBar progress;

	private Button positive, negative;

	public static final int MSG_START = 0;

	public static final int MSG_UPDATE = 1;

	public static final int MSG_DONE = 2;

	private Handler.Callback messageCallback = new Handler.Callback() {

		@Override

		public boolean handleMessage(Message msg) {

			switch(msg.what){

			case MSG_START:

				progress.setMax(msg.arg1);

				progress_sub.setText(String.format("%dkb/%dkb\n%s", 0, msg.arg1, ""));

				break;

			case MSG_UPDATE:

				progress_sub.setText(String.format("%d%% - %dkb/%dkb\n%s",(msg.arg1*100)/msg.arg2, msg.arg1, msg.arg2, msg.obj));

				progress.setProgress(msg.arg1);

				break;

			case MSG_DONE:

				progress.setProgress(progress.getMax());

				progress_sub.setText(R.string.download_done);

				positive.setText(R.string.download_back);

				positive.setOnClickListener(doneClicker);

				break;

			}

			return false;

		}

	};

	private Handler messageHandler = new Handler(messageCallback);

	private Messenger messenger = new Messenger(messageHandler);

	public void onCreate(Bundle savedInstanceState){

		super.onCreate(savedInstanceState);

		setContentView(R.layout.download);

		progress_sub = (TextView)findViewById(R.id.progressbar_sub);

		progress = (ProgressBar)findViewById(R.id.progressbar);

		positive = (Button) findViewById(R.id.background);

		negative = (Button) findViewById(R.id.cancelDownload);

		positive.setOnClickListener(backgroundClicker);

		negative.setOnClickListener(cancelClicker);

	}

	private OnClickListener backgroundClicker = new OnClickListener(){

		public void onClick(View v){

			finish();

		}

	};

	private OnClickListener cancelClicker = new OnClickListener(){

		public void onClick(View v){

			Intent i = new Intent(getApplicationContext(), DownloadService.class);

			i.putExtra("taskID", DownloadService.TASKID_CANCEL);

			startService(i);

			finish();

		}

	};

	private OnClickListener doneClicker = new OnClickListener(){

		public void onClick(View v){

			finish();

			startActivity(new Intent(getApplicationContext(), MainActivity.class));

		}

	};

	public void onStart(){

		super.onStart();

		bindToService();

	}

	public void onStop(){

		super.onStop();

		unBindFromService();

	}

	private ServiceConnection connection = new ServiceConnection(){

		@Override

		public void onServiceConnected(ComponentName name, IBinder service) {

			messageService = new Messenger(service);

			try{

				Message msg = Message.obtain(null, DownloadService.MSG_REGISTER_CLIENT);

				msg.replyTo = messenger;

				messageService.send(msg);

			}catch (RemoteException e){}

		}

		@Override

		public void onServiceDisconnected(ComponentName name) {

			messageService = null;

		}

	};

	private void bindToService(){

		Intent i = new Intent(getApplicationContext(), DownloadService.class);

		i.putExtra("taskID", DownloadService.TASKID_START);

		startService(i);

		bindService(new Intent(getApplicationContext(), DownloadService.class), connection, Context.BIND_AUTO_CREATE);

		boundToService = true;

	}

	private void unBindFromService(){

		if(boundToService){

			boundToService = false;

			unbindService(connection);

		}	

	}

}