package edu.ucla.iBeaconNav;

import java.util.List;
import java.util.LinkedList;
import java.util.Collection;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.IBinder;
import android.os.Looper;
import android.os.Messenger;
import android.os.RemoteException;
import android.preference.PreferenceManager;

public class Task extends Service
{
	/* Private data */
	private Messenger      messenger;
	private Beacon         beacon;
	private Sensors        sensors;
	private boolean        running;

	/* Public methods */
	public void tellMain(CMD.Response cmd, Object value)
	{
		try {
			android.os.Message msg = android.os.Message.obtain();
			msg.what = cmd.ordinal();
			msg.obj  = value;
			this.messenger.send(msg);
		} catch (Exception e) {
			Util.debug("Task: error sending message", e);
		}
	}

	public void notify(String text, int icon)
	{
		// Notify Main
		this.tellMain(CMD.Response.NOTIFY, text);

		// Notification bar
		Notification  note = new Notification.Builder(this)
			.setContentTitle("iBeaconNav!")
			.setContentText("iBeaconNav!")
			.setSmallIcon(icon)
			.build();

		this.startForeground(1, note);
	}

	public boolean isRunning()
	{
		return this.running;
	}

	/* Private methods */
	private void handle(CMD.Command cmd, Messenger mgr)
	{
		// Validate messenger
		if (cmd != CMD.Command.REGISTER && mgr != null && mgr != this.messenger)
			Util.debug("Task: handle - invalid messenger");

		// Handle the command
		switch (cmd) {
			// Setup communication with Main
			case REGISTER:
				Util.debug("Task: handle - register");
				this.messenger = mgr;
				this.tellMain(CMD.Response.REGISTER, this);
				break;

			// Create client thread
			case CONNECT:
				Util.debug("Task: handle - connect");
				this.running = true;
				this.beacon.connect();
				this.sensors.connect();
				this.notify("Connected", android.R.drawable.presence_online);
				break;

			// Stop client thread
			case DISCONNECT:
				Util.debug("Task: handle - register");
				this.running = false;
				this.beacon.disconnect();
				this.sensors.disconnect();
				this.stopForeground(true);
				break;

			// Reset heading
			case RSTHEAD:
				this.sensors.reset_heading();
				break;

			// Reset distance
			case RSTDST:
				this.sensors.reset_distance();
				break;

		}
	}

	/* Service Methods */
	@Override
	public void onCreate()
	{
		Util.debug("Task: onCreate");
		super.onCreate();
		this.beacon  = new Beacon(this);
		this.sensors = new Sensors(this);
	}

	@Override
	public void onDestroy()
	{
		Util.debug("Task: onDestroy");
		super.onDestroy();
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId)
	{
		Util.debug("Task: onStartCommand");
		int         rval = super.onStartCommand(intent, flags, startId);
		CMD.Command cmd  = (CMD.Command)intent.getExtras().get("Command");
		Messenger   mgr  = (Messenger)intent.getExtras().get("Messenger");
		this.handle(cmd, mgr);
		return rval;
	}

	@Override
	public IBinder onBind(Intent intent)
	{
		Util.debug("Task: onBind");
		return null;
	}
}