package net.sabi.pester;

import java.util.Comparator;
import danger.app.Application;
import danger.app.DataStore;
import danger.app.Event;
import danger.app.SettingsDB;
import danger.app.SettingsDBException;
import danger.internal.Date;
import danger.util.StdActiveList;

public class Alarms extends StdActiveList {
    // max # records in a datastore
    private static final int MAX_ALARM_COUNT = 50;

    private static Alarms sAlarmList = null;
    private static Listener sListener;
    private static SettingsDB sSettingsDB;

    private DataStore mDataStore;

    private Alarms() {
	mDataStore = DataStore.createDataStore("alarms", true /* auto sync */);
    }

    public static Alarms getList() {
	if (sAlarmList == null) {
	    sAlarmList = new Alarms();
	    sListener = new Listener();
	    sSettingsDB = new SettingsDB("settings", true /* auto sync */);
	    Application.registerForEvent(sListener, Event.EVENT_TIME_CHANGED);
	}
	return sAlarmList;
    }

    public static void addAlarm(Alarm alarm) {
	sAlarmList.addItem(alarm);
    }
    public static void removeAlarm(Alarm alarm) {
	sAlarmList.removeItem(alarm);
    }

    private static String KEY_DEFAULT_ALARM = "default alarm";

    public static Alarm getDefaultAlarm() {
	Alarm defaultAlarm = new Alarm();
	try {
	    defaultAlarm.fromByteArray(sSettingsDB.getBytes(KEY_DEFAULT_ALARM));
	} catch (SettingsDBException e) {
	    defaultAlarm = new Alarm();
	    defaultAlarm.setDate(new Date());
	    defaultAlarm.setPeriod(600, false);
	}
	return defaultAlarm;
    }
    public static void setDefaultAlarm(Alarm alarm) {
	sSettingsDB.setBytes(KEY_DEFAULT_ALARM, alarm.toByteArray());
    }

    /*
    private static Alarm sAlarm0 = new Alarm();
    private static Alarm sAlarm1 = new Alarm();
    public int compare(Object arg0, Object arg1) {
	
	return Collator.getInstance().compare(
    }
    */

    static class Listener extends danger.app.Listener
	implements danger.util.ActiveList.ForEach {
	
	public void receive(Object item) {
	    ((Alarm)item).timeChanged();
	}

	public boolean receiveEvent(Event e) {
	    if (e.type == Event.EVENT_TIME_CHANGED) {
		// XXX do we get this when the time zone changes?
		Alarms.getList().forEach(this);
		return true;
	    }
	    return super.receiveEvent(e);
	}
    }
}