import java.io.Serializable;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;

public class TimeStamp implements Comparable<TimeStamp>, Serializable {

	private static final long serialVersionUID = -2419868536330628838L;

	private final LocalDate datum;

	public TimeStamp(int jaar, int maand, int dagVanDeMaand) {
		this(LocalDate.of(jaar, maand, dagVanDeMaand));
	}

	public TimeStamp(LocalDate datum) {
		this.datum = datum;
	}

	public LocalDate getDatum() {
		return datum;
	}

	public int getJaar() {
		return datum.getYear();
	}

	public int getMaand() {
		return datum.getMonthValue();
	}

	public int getDagVanDeMaand() {
		return datum.getDayOfMonth();
	}

	public boolean isBefore(TimeStamp other) {
		return this.datum.isBefore(other.datum);
	}

	public boolean isAfter(TimeStamp other) {
		return this.datum.isAfter(other.datum);
	}

	/**
	 * Berekent absolute verschil tussen de meegegeven timestamps. Geeft dus nooit een negatieve waarde terug.
	 */
	public static int getDaysBetween(TimeStamp t1, TimeStamp t2) {
		return Math.abs((int) t1.datum.until(t2.datum, ChronoUnit.DAYS));
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((datum == null) ? 0 : datum.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		TimeStamp other = (TimeStamp) obj;
		if (datum == null) {
			if (other.datum != null)
				return false;
		} else if (!datum.equals(other.datum))
			return false;
		return true;
	}

	@Override
	public int compareTo(TimeStamp other) {
		return this.datum.compareTo(other.datum);
	}

	private static final DateTimeFormatter FORMATTER =  DateTimeFormatter.ofPattern("dd/MM/yyyy");

	@Override
	public String toString() {
		return datum.format(FORMATTER);
	}

	public static TimeStamp parse(String datumString) {
		return new TimeStamp(LocalDate.parse(datumString, FORMATTER));
	}
}