AltitudeBot/src/main/java/com/alttd/schedulers/EventTimerTask.java

package com.alttd.schedulers;

import com.alttd.database.queries.events.Event;
import com.alttd.util.Logger;
import net.dv8tion.jda.api.entities.Message;

import java.time.Instant;
import java.util.Optional;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

public class EventTimerTask extends TimerTask {
    @Override
    public void run() {
        checkShouldStartEvent();
    }

    private void checkShouldStartEvent(){
        Optional<Event> nextEvent = Event.getNextEvent();
        if (nextEvent.isEmpty()) {
            return;
        }
        Event event = nextEvent.get();
        if (event.getStartTime().isAfter(Instant.now())) {
            return;
        }

        Event.removeEvent(event);
        performEventAction(event);
        event.getRole().delete().queueAfter(1, TimeUnit.HOURS);
        checkShouldStartEvent();
    }

    private void performEventAction(Event event) {
        Optional<Message> optionalMessage = event.getMessage();
        if (optionalMessage.isEmpty()) {
            Logger.altitudeLogs.error("Unable to find message for event");
            return;
        }

        Message message = optionalMessage.get();

        message.reply(String.format("%s [%s] is starting!", event.getRole().getAsMention(), event.getTitle())).queue();
    }
}