package org.isoron.uhabits;

import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.LinkedList;

import org.isoron.helpers.Command;
import org.isoron.uhabits.dialogs.ShowHabitsFragment;
import org.isoron.uhabits.models.Habit;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends Activity
{

	private ShowHabitsFragment showHabitsFragment;

	private LinkedList<Command> undoList;
	private LinkedList<Command> redoList;

	private static int MAX_UNDO_LEVEL = 15;

	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 *                                   Creation                                                  *
	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		
		getActionBar().setElevation(5);
		
		setContentView(R.layout.main_activity);
		showHabitsFragment = (ShowHabitsFragment) getFragmentManager().findFragmentById(
				R.id.fragment1);
	
		Log.d("MainActivity", "Creating activity");

		undoList = new LinkedList<Command>();
		redoList = new LinkedList<Command>();
		
		createReminderAlarms(MainActivity.this);
	}
	
	@Override
	protected void onStart()
	{
		super.onStart();
		showHabitsFragment.notifyDataSetChanged();
		Log.d("MainActivity", "Starting activity");
	}
	
	public static void createReminderAlarms(Context context)
	{
		for(Habit habit : Habit.getHabitsWithReminder())
			createReminderAlarm(context, habit, null);
	}
	
	public static void createReminderAlarm(Context context, Habit habit, Long reminderTime)
	{
		Uri uri = Uri.parse("content://org.isoron.uhabits/habit/" + habit.getId());
		
		if(reminderTime == null)
		{
			Calendar calendar = Calendar.getInstance();
			calendar.setTimeInMillis(System.currentTimeMillis());
			calendar.set(Calendar.HOUR_OF_DAY, habit.reminder_hour);
			calendar.set(Calendar.MINUTE, habit.reminder_min);
			calendar.set(Calendar.SECOND, 0);
			
			reminderTime = calendar.getTimeInMillis();
			
			if(System.currentTimeMillis() > reminderTime) {
				reminderTime += AlarmManager.INTERVAL_DAY;
			}
		}
		
		Intent alarmIntent = new Intent(context, ReminderAlarmReceiver.class);
		alarmIntent.setAction(ReminderAlarmReceiver.ACTION_REMIND);
		alarmIntent.setData(uri);
		
		PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
				((int)(habit.getId() % Integer.MAX_VALUE)) + 1,
				alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
		
		AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
		if (Build.VERSION.SDK_INT >= 19) {
			manager.setExact(AlarmManager.RTC_WAKEUP, reminderTime, pendingIntent);
		} else {
			manager.set(AlarmManager.RTC_WAKEUP, reminderTime, pendingIntent);
		}
		
		Log.d("Alarm", String.format("Setting alarm (%s): %s", DateFormat.getDateTimeInstance()
				.format(new Date(reminderTime)), habit.name));
	}

	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 *                                 Action Bar Menu                                             *
	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

	@Override
	public boolean onCreateOptionsMenu(Menu menu)
	{
		getMenuInflater().inflate(R.menu.main_activity, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item)
	{
		int id = item.getItemId();
		if(id == R.id.action_settings)
		{
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 *                               Commands, Undo, Redo                                          *
	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

	public void executeCommand(Command command, boolean datasetChanged)
	{
		executeCommand(command, datasetChanged, true);
	}

	public void executeCommand(Command command, boolean datasetChanged, boolean clearRedoStack)
	{
		undoList.push(command);
		if(undoList.size() > MAX_UNDO_LEVEL)
			undoList.removeLast();
		if(clearRedoStack)
			redoList.clear();
		command.execute();

		showToast(command.getExecuteStringId());
		if(datasetChanged)
		{
			showHabitsFragment.notifyDataSetChanged();
		}
	}

	public void undo()
	{
		if(undoList.isEmpty())
		{
			showToast(R.string.toast_nothing_to_undo);
			return;
		}

		Command last = undoList.pop();
		redoList.push(last);
		last.undo();
		showToast(last.getUndoStringId());

		showHabitsFragment.notifyDataSetChanged();
	}

	public void redo()
	{
		if(redoList.isEmpty())
		{
			showToast(R.string.toast_nothing_to_redo);
			return;
		}
		Command last = redoList.pop();
		executeCommand(last, true, false);
	}

	private Toast toast;

	private void showToast(Integer stringId)
	{
		if(stringId == null)
			return;
		if(toast == null)
			toast = Toast.makeText(this, stringId, Toast.LENGTH_SHORT);
		else
			toast.setText(stringId);
		toast.show();
	}
}