package org.litesoft.core.typeutils.gregorian;

import org.litesoft.core.simpletypes.temporal.*;

public class Dates
{
    public static CalendarYMD forceEndOfMonth( CalendarYMD pCalendarYMD )
    {
        return (pCalendarYMD == null) ? null : pCalendarYMD.forceEndOfMonth();
    }

    /**
     * Returns null if a valid date, or error text if not!
     */
    public static String checkValidity( int pYear, int pMonth, int pDay )
    {
        Month zMonth = Month.fromMonthNumber( pMonth );
        if ( zMonth == null )
        {
            return "Invalid month: " + pMonth;
        }
        if ( pDay < 1 )
        {
            return "Invalid day: " + pDay;
        }
        int maxDaysInMonth = zMonth.daysIn( pYear );
        if ( maxDaysInMonth < pDay )
        {
            return zMonth.name() + " " + pYear + " only has " + maxDaysInMonth + ", attempted to set days to: " + pDay;
        }
        return null;
    }
}