package net.sourceforge.fenixedu.domain.time.chronologies;

import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicCalendarEntry;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicCalendarRootEntry;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicSemesterCE;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicTrimesterCE;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicYearCE;
import net.sourceforge.fenixedu.domain.time.chronologies.dateTimeFields.AcademicSemesterDateTimeField;
import net.sourceforge.fenixedu.domain.time.chronologies.dateTimeFields.AcademicSemesterOfAcademicYearDateTimeField;
import net.sourceforge.fenixedu.domain.time.chronologies.dateTimeFields.AcademicTrimesterDateTimeField;
import net.sourceforge.fenixedu.domain.time.chronologies.dateTimeFields.AcademicYearDateTimeField;
import net.sourceforge.fenixedu.domain.time.chronologies.dateTimeFields.DayOfAcademicSemesterDateTimeField;
import net.sourceforge.fenixedu.domain.time.chronologies.durationFields.AcademicSemestersDurationField;
import net.sourceforge.fenixedu.domain.time.chronologies.durationFields.AcademicTrimesterDurationField;
import net.sourceforge.fenixedu.domain.time.chronologies.durationFields.AcademicYearsDurationField;

import org.joda.time.Chronology;
import org.joda.time.DateTime;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeZone;
import org.joda.time.DurationField;
import org.joda.time.Interval;
import org.joda.time.chrono.AssembledChronology;
import org.joda.time.chrono.ISOChronology;

public class AcademicChronology extends AssembledChronology {

    private transient AcademicCalendarRootEntry academicCalendar;

    // Duration Fields
    private transient DurationField acAcademicYearsField;

    private transient DurationField acAcademicSemestersField;

    private transient DurationField acAcademicTrimestersField;

    // DateTime Fields
    private transient DateTimeField acAcademicYear;

    private transient DateTimeField acAcademicSemester;

    private transient DateTimeField acAcademicSemesterOfAcademicYear;

    private transient DateTimeField acDayOfAcademicSemester;

    private transient DateTimeField acAcademicTrimester;

    // Static Variables
    private static final ISOChronology ISO_INSTANCE;
    static {
	ISO_INSTANCE = ISOChronology.getInstance();
    }

    // Override Methods

    public AcademicChronology(AcademicCalendarRootEntry academicCalendar) {
	super(ISO_INSTANCE, null);
	this.academicCalendar = academicCalendar;
    }

    @Override
    protected void assemble(Fields fields) {
	acAcademicYearsField = new AcademicYearsDurationField(this);
	acAcademicYear = new AcademicYearDateTimeField(this);

	acAcademicTrimester = new AcademicTrimesterDateTimeField(this);
	acAcademicTrimestersField = new AcademicTrimesterDurationField(this);

	acAcademicSemester = new AcademicSemesterDateTimeField(this);
	acAcademicSemestersField = new AcademicSemestersDurationField(this);
	acAcademicSemesterOfAcademicYear = new AcademicSemesterOfAcademicYearDateTimeField(this);
	acDayOfAcademicSemester = new DayOfAcademicSemesterDateTimeField(this);
    }

    @Override
    public Chronology withUTC() {
	return ISO_INSTANCE.getInstanceUTC();
    }

    @Override
    public Chronology withZone(DateTimeZone zone) {
	return ISO_INSTANCE.withZone(zone);
    }

    @Override
    public String toString() {
	String str = "AcademicChronology";
	DateTimeZone zone = getZone();
	if (zone != null) {
	    str = str + '[' + zone.getID() + ']';
	}
	return str;
    }

    // DateTime Fields

    public DateTimeField academicYear() {
	return acAcademicYear;
    }

    public DateTimeField academicSemester() {
	return acAcademicSemester;
    }

    public DateTimeField academicTrimester() {
	return acAcademicTrimester;
    }

    public DateTimeField academicSemesterOfAcademicYear() {
	return acAcademicSemesterOfAcademicYear;
    }

    public DateTimeField dayOfAcademicSemester() {
	return acDayOfAcademicSemester;
    }

    // Duration Fields

    public DurationField academicYears() {
	return acAcademicYearsField;
    }

    public DurationField academicSemesters() {
	return acAcademicSemestersField;
    }

    public DurationField academicTrimesters() {
	return acAcademicTrimestersField;
    }

    // Auxiliar Methods

    public AcademicSemesterCE getAcademicSemesterIn(int index) {
	return (AcademicSemesterCE) academicCalendar.getEntryByIndex(index, AcademicSemesterCE.class, AcademicYearCE.class);
    }

    public AcademicYearCE getAcademicYearIn(int index) {
	return (AcademicYearCE) academicCalendar.getEntryByIndex(index, AcademicYearCE.class, AcademicCalendarRootEntry.class);
    }

    public int getAcademicTrimester(long instant) {
	Integer entryValueByInstant = academicCalendar.getEntryIndexByInstant(instant, AcademicTrimesterCE.class,
		AcademicSemesterCE.class);
	if (entryValueByInstant != null) {
	    return entryValueByInstant;
	}
	return 0;
    }

    public int getAcademicSemester(long instant) {
	Integer entryValueByInstant = academicCalendar.getEntryIndexByInstant(instant, AcademicSemesterCE.class,
		AcademicYearCE.class);
	if (entryValueByInstant != null) {
	    return entryValueByInstant;
	}
	return 0;
    }

    public int getAcademicYear(long instant) {
	Integer entryValueByInstant = academicCalendar.getEntryIndexByInstant(instant, AcademicYearCE.class,
		AcademicCalendarRootEntry.class);
	if (entryValueByInstant != null) {
	    return entryValueByInstant;
	}
	return 0;
    }

    public int getDayOfAcademicSemester(long instant) {
	AcademicCalendarEntry entryByInstant = academicCalendar.getEntryByInstant(instant, AcademicSemesterCE.class,
		AcademicYearCE.class);
	if (entryByInstant != null) {
	    DateTime instantDateTime = new DateTime(instant);
	    Interval interval = new Interval(entryByInstant.getBegin(), instantDateTime);
	    int days = interval.toPeriod().getDays();
	    if (days > 0) {
		return days;
	    }
	}
	return 0;
    }

    public int getAcademicSemesterOfAcademicYear(long instant) {
	AcademicSemesterCE entryByInstant = (AcademicSemesterCE) academicCalendar.getEntryByInstant(instant,
		AcademicSemesterCE.class, AcademicYearCE.class);
	return entryByInstant.getAcademicSemesterOfAcademicYear(this);
    }

    public int getMaximumValueForAcademicSemesterOfAcademicYear(long instant) {
	int academicSemesterOfAcademicYear = getAcademicSemesterOfAcademicYear(instant);
	if (academicSemesterOfAcademicYear == 0) {
	    return getMaximumValueForAcademicSemesterOfAcademicYear();
	}
	return getMaximumValueForAcademicSemesterOfAcademicYear() - academicSemesterOfAcademicYear;
    }

    public int getMaximumValueForAcademicSemesterOfAcademicYear() {
	return 2;
    }

    public AcademicCalendarEntry findSameEntry(final AcademicCalendarEntry entry) {
	return entry.getEntryForCalendar(academicCalendar);
    }
}