Automation/app/src/main/java/com/jens/automation2/receivers/CalendarReceiver.java

package com.jens.automation2.receivers;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;

import com.jens.automation2.AutomationService;
import com.jens.automation2.Miscellaneous;
import com.jens.automation2.Rule;
import com.jens.automation2.Trigger;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

public class CalendarReceiver extends BroadcastReceiver implements AutomationListenerInterface
{
    static CalendarReceiver calendarReceiverInstance = null;
    static boolean calendarReceiverActive = false;
    static IntentFilter calendarIntentFilter = null;
    private static AutomationService automationServiceRef;
    private static Intent calendarIntent = null;

    public static CalendarReceiver getInstance()
    {
        if(calendarReceiverInstance == null)
            calendarReceiverInstance = new CalendarReceiver();

        return calendarReceiverInstance;
    }

    @Override
    public void onReceive(Context context, Intent intent)
    {
        if(intent.getAction().equalsIgnoreCase(Intent.ACTION_PROVIDER_CHANGED))
        {
            ArrayList<Rule> ruleCandidates = Rule.findRuleCandidates(Trigger.Trigger_Enum.calendarEvent);
            for(int i = 0; i < ruleCandidates.size(); i++)
            {
                if(ruleCandidates.get(i).getsGreenLight(context))
                    ruleCandidates.get(i).activate(AutomationService.getInstance(), false);
            }
        }
    }

    @Override
    public void startListener(AutomationService automationService)
    {
        if(!calendarReceiverActive)
        {
            if(calendarReceiverInstance == null)
                calendarReceiverInstance = new CalendarReceiver();

            if(calendarIntentFilter == null)
            {
                calendarIntentFilter = new IntentFilter();
                calendarIntentFilter.addAction(Intent.ACTION_PROVIDER_CHANGED);
            }

            AutomationService.getInstance().registerReceiver(calendarReceiverInstance, calendarIntentFilter);

            calendarReceiverActive = true;
        }
    }

    @Override
    public void stopListener(AutomationService automationService)
    {
        if(calendarReceiverActive)
        {
            if(calendarReceiverInstance != null)
            {
                AutomationService.getInstance().unregisterReceiver(calendarReceiverInstance);
                calendarReceiverInstance = null;
            }

            calendarReceiverActive = false;
        }
    }

    @Override
    public boolean isListenerRunning()
    {
        return calendarReceiverActive;
    }

    @Override
    public Trigger.Trigger_Enum[] getMonitoredTrigger()
    {
        return new Trigger.Trigger_Enum[]{Trigger.Trigger_Enum.calendarEvent};
    }

    public static class CalendarEvent
    {
        public String calendarId, eventId, title, description, location, availability;
        public Calendar start, end;
        public boolean allDay;

        public boolean isCurrentActive()
        {
            Calendar now = Calendar.getInstance();
            return now.getTimeInMillis() >= start.getTimeInMillis() && now.getTimeInMillis() < end.getTimeInMillis();
        }
    }

    public static List<CalendarEvent> readCalendarEvents(Context context)
    {
        Cursor cursor;

//        if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.FROYO)
//            cursor = context.getContentResolver().query(
//                    Uri.parse("content://calendar/calendars"),
//                    new String[] { "calendar_id", "title", "description", "dtstart", "dtend", "eventLocation", "availability" },
//                    null, null, null);
//        else
            cursor = context.getContentResolver().query(
                        Uri.parse("content://com.android.calendar/events"),
                        new String[] { "calendar_id", "original_id", "title", "description", "allDay", "dtstart", "dtend", "eventLocation", "availability" },
                        null, null, null);

        cursor.moveToFirst();
        // fetching calendars name
        String CNames[] = new String[cursor.getCount()];

        List<CalendarEvent> eventlist = new ArrayList<>();

        for (int i = 0; i < CNames.length; i++)
        {
            try
            {
                CalendarEvent event = new CalendarEvent();
                event.calendarId = cursor.getString(0);
                event.eventId = cursor.getString(1);
                event.title = cursor.getString(2);
                event.description = cursor.getString(3);
                event.allDay = cursor.getString(4).equals("1");
                event.start = Miscellaneous.calendarFromLong(Long.parseLong(cursor.getString(5)));
                event.end = Miscellaneous.calendarFromLong(Long.parseLong(cursor.getString(6)));
                event.location = cursor.getString(7);
                event.availability = cursor.getString(8);
                eventlist.add(event);
            }
            catch (Exception e)
            {}
            cursor.moveToNext();
        }

        if(cursor != null)
            cursor.close();

        return eventlist;
    }

    public static void startCalendarReceiver(final AutomationService automationServiceRef)
    {
        if (!calendarReceiverActive)
        {
            CalendarReceiver.automationServiceRef = automationServiceRef;

            if (calendarReceiverInstance == null)
                calendarReceiverInstance = new CalendarReceiver();

            if (calendarIntentFilter == null)
            {
                calendarIntentFilter = new IntentFilter();
                calendarIntentFilter.addAction(Intent.ACTION_PROVIDER_CHANGED);
            }

            calendarIntent = automationServiceRef.registerReceiver(calendarReceiverInstance, calendarIntentFilter);

            calendarReceiverActive = true;
        }
    }

    public static void stopScreenStateReceiver()
    {
        if (calendarReceiverActive)
        {
            if (calendarReceiverInstance != null)
            {
                automationServiceRef.unregisterReceiver(calendarReceiverInstance);
                calendarReceiverInstance = null;
            }

            calendarReceiverActive = false;
        }
    }
}