package net.sourceforge.fenixedu.domain.assiduousness;

import java.util.List;

import net.sourceforge.fenixedu.domain.Employee;
import net.sourceforge.fenixedu.domain.RootDomainObject;
import net.sourceforge.fenixedu.domain.exceptions.DomainException;

import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.joda.time.LocalDate;
import org.joda.time.Months;

public class AssiduousnessStatusHistory extends AssiduousnessStatusHistory_Base {

    public AssiduousnessStatusHistory(Assiduousness assiduousness, AssiduousnessStatus assiduousnessStatus, LocalDate beginDate,
	    LocalDate endDate, DateTime lastModifiedDate, Employee modifiedBy) {
	super();
	setRootDomainObject(RootDomainObject.getInstance());
	setAssiduousness(assiduousness);
	setAssiduousnessStatus(assiduousnessStatus);
	setBeginDate(beginDate);
	setEndDate(endDate);
	setLastModifiedDate(lastModifiedDate);
	setModifiedBy(modifiedBy);
    }

    public AssiduousnessStatusHistory(Assiduousness assiduousness, AssiduousnessStatus assiduousnessStatus, LocalDate beginDate,
	    LocalDate endDate, Employee modifiedBy) {
	if (endDate != null) {
	    if (!endDate.isAfter(beginDate)) {
		throw new DomainException("error.invalidDateInterval");
	    }
	}
	AssiduousnessStatusHistory lastAssiduousnessStatusHistory = assiduousness.getLastAssiduousnessStatusHistory();
	if (lastAssiduousnessStatusHistory != null) {
	    if (lastAssiduousnessStatusHistory.getAssiduousnessStatus().equals(assiduousnessStatus)) {
		throw new DomainException("error.sameAssiduousnessStatus");
	    }

	    if (lastAssiduousnessStatusHistory.getEndDate() == null) {
		if (!beginDate.isAfter(ClosedMonth.getLastClosedLocalDate())) {
		    throw new DomainException("error.datesInclosedMonth");
		}
		lastAssiduousnessStatusHistory.setEndDate(beginDate.minusDays(1));
	    }
	}

	setRootDomainObject(RootDomainObject.getInstance());
	setAssiduousness(assiduousness);
	setAssiduousnessStatus(assiduousnessStatus);
	setBeginDate(beginDate);
	setEndDate(endDate);
	setLastModifiedDate(new DateTime());
	setModifiedBy(modifiedBy);

    }

    public void editAssiduousnessStatusHistory(LocalDate endDate, Employee modifiedBy) {
	if (endDate != null) {
	    LocalDate lastLocalDateClosed = ClosedMonth.getLastClosedLocalDate();
	    if (!endDate.isAfter(lastLocalDateClosed)) {
		throw new DomainException("error.datesInclosedMonth");
	    }
	    if (!endDate.isAfter(getBeginDate())) {
		throw new DomainException("error.invalidDateInterval");
	    }
	}
	setEndDate(endDate);
    }

    public boolean isEditable() {
	return getAssiduousness().getLastAssiduousnessStatusHistory().getIdInternal().equals(getIdInternal())
		&& (getEndDate() == null || !getEndDate().isBefore(ClosedMonth.getLastClosedLocalDate()));
    }

    public boolean isDeletable() {
	return getAssiduousness().getLastAssiduousnessStatusHistory().equals(this)
		&& !getBeginDate().isBefore(ClosedMonth.getLastClosedLocalDate());
    }

    private boolean canBeDeleted() {
	return getAssiduousnessClosedMonths().isEmpty();
    }

    public void delete() {
	if (canBeDeleted()) {
	    removeRootDomainObject();
	    removeAssiduousness();
	    removeAssiduousnessStatus();
	    removeModifiedBy();
	    deleteDomainObject();
	}
    }

    public Duration getSheculeWeightedAverage(LocalDate beginDate, LocalDate endDate) {
	Duration averageWorkPeriodDuration = Duration.ZERO;
	if (beginDate.isBefore(getBeginDate())) {
	    beginDate = getBeginDate();
	}
	if (getEndDate() != null && endDate.isAfter(getEndDate())) {
	    endDate = getEndDate();
	}
	for (int month = beginDate.getMonthOfYear(); month <= endDate.getMonthOfYear(); month++) {
	    Duration thisMonthWorkPeriodAverage = Duration.ZERO;
	    LocalDate beginMonth = new LocalDate(beginDate.getYear(), month, 1);
	    LocalDate endMonth = new LocalDate(endDate.getYear(), month, beginMonth.dayOfMonth().getMaximumValue());
	    List<Schedule> schedules = getAssiduousness().getSchedules(beginMonth, endMonth);
	    for (Schedule schedule : schedules) {
		thisMonthWorkPeriodAverage = thisMonthWorkPeriodAverage.plus(schedule.getAverageWorkPeriodDuration());
	    }
	    thisMonthWorkPeriodAverage = new Duration(thisMonthWorkPeriodAverage.getMillis() / schedules.size());
	    averageWorkPeriodDuration = averageWorkPeriodDuration.plus(thisMonthWorkPeriodAverage);
	}
	averageWorkPeriodDuration = new Duration(averageWorkPeriodDuration.getMillis()
		/ (Months.monthsBetween(beginDate, endDate).getMonths() + 1));
	return averageWorkPeriodDuration;
    }
}