package pt.utl.ist.codeGenerator.database;

import java.util.Set;
import java.util.Stack;

import net.sourceforge.fenixedu.domain.space.Room;

import org.joda.time.DateTime;
import org.joda.time.DateTimeFieldType;

public class EvaluationRoomManager extends Stack<Room> {

    private final DateTime startDateTime;
    private final DateTime endDateTime;

    private final int evaluationDurationInMinutes;

    private DateTime nextDateTime;

    public EvaluationRoomManager(final DateTime startDateTime, final DateTime endDateTime, final int evaluationDurationInMinutes, Set<Room> oldRooms) {
	this.startDateTime = startDateTime.withField(DateTimeFieldType.hourOfDay(), 8);
	this.endDateTime = endDateTime.withField(DateTimeFieldType.hourOfDay(), 20);
	this.nextDateTime = startDateTime;
	this.evaluationDurationInMinutes = evaluationDurationInMinutes;
	addAll(oldRooms);
    }

    public DateTime getNextDateTime() {
	if (nextDateTime.isAfter(endDateTime)) {
	    pop();
	    nextDateTime = startDateTime;
	} else if (nextDateTime.getHourOfDay() > 20) {
	    if (nextDateTime.getDayOfWeek() == 6) {
		nextDateTime = nextDateTime.plusDays(2).withField(DateTimeFieldType.hourOfDay(), 8);
	    } else {
		nextDateTime = nextDateTime.plusDays(1).withField(DateTimeFieldType.hourOfDay(), 8);
	    }
	} else {
	    nextDateTime = nextDateTime.plusMinutes(evaluationDurationInMinutes);
	}
	return nextDateTime;
    }

    public Room getNextOldRoom() {
	return peek();
    }

}