package com.ether;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jetbrains.annotations.Nullable;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

/**
 * @author vmipsl
 * @date 2011
 */
public abstract class DateHelper
{
    /**
     * Set the date with a default locale (french)
     *
     * @param date date to formate
     * @return a new date set to midnight
     */
    public static Date to00h00m00s( final Date date )
    {
        assert ( null != date );
        final Calendar calendar = Calendar.getInstance( Locale.FRENCH );

        return setMinimumFields( date, calendar );
    }

    /**
     * Set the date with a default locale (french)
     *
     * @param date date to formate
     * @return a new date set to 23h 59m 59s
     */
    public static Date to23h59m59s( final Date date )
    {
        assert ( null != date );
        final Calendar calendar = Calendar.getInstance( Locale.FRENCH );

        return setMaximumFields( date, calendar );
    }

    /**
     * Set the date using the given locale
     *
     * @param locale locale to use
     * @param date   date to formate
     * @return a new date set to midnight
     */
    public static Date to00h00m00s( final Locale locale, final Date date )
    {
        assert ( null != date );
        final Calendar calendar = Calendar.getInstance( locale );

        return setMinimumFields( date, calendar );
    }

    /**
     * Set the date using the given locale
     *
     * @param locale locale to use
     * @param date   date to formate
     * @return a new date set to 23h 59m 59s
     */
    public static Date to23h59m59s( final Locale locale, final Date date )
    {
        assert ( null != date );
        final Calendar calendar = Calendar.getInstance( locale );

        return setMaximumFields( date, calendar );
    }


    private static Date setMinimumFields( final Date date, final Calendar calendar )
    {
        calendar.setTime( date );
        calendar.set( Calendar.HOUR_OF_DAY, calendar.getMinimum( Calendar.HOUR_OF_DAY ) );
        calendar.set( Calendar.MINUTE, calendar.getMinimum( Calendar.MINUTE ) );
        calendar.set( Calendar.SECOND, calendar.getMinimum( Calendar.SECOND ) );

        return calendar.getTime();
    }

    private static Date setMaximumFields( final Date date, final Calendar calendar )
    {
        calendar.setTime( date );
        calendar.set( Calendar.HOUR_OF_DAY, calendar.getMaximum( Calendar.HOUR_OF_DAY ) );
        calendar.set( Calendar.MINUTE, calendar.getMaximum( Calendar.MINUTE ) );
        calendar.set( Calendar.SECOND, calendar.getMaximum( Calendar.SECOND ) );

        return calendar.getTime();
    }

    public static String shortFormatFrench( final Date date )
    {
        return formatDate( date, FRENCH_DATE_PATTERN_SHORT );
    }

    public static String shortFormat( final Date date, final Locale locale )
    {
        if( date == null )
            return "";

        final DateFormat dateFormat = DateFormat.getDateInstance( DateFormat.SHORT, locale );

        return dateFormat.format( date );
    }

    public static String orderedFormat( final Date date )
    {
        return formatDate( date, ORDERED_FORMAT );
    }

    public static String orderedFormatPlusGMT( final Date date )
    {
        return formatDate( date, ORDERED_FORMAT_PLUS_GMT );
    }

    public static String formatDate( @Nullable final Date date, final String format )
    {
        if( date == null )
            return "";

        final SimpleDateFormat simpleDateFormat = new SimpleDateFormat( format );
        return simpleDateFormat.format( date );
    }

    @Nullable
    public static Date parseDate( @Nullable final String date, final String format ) throws ParseException
    {
    	if( date == null )
            return null;

        final SimpleDateFormat simpleDateFormat = new SimpleDateFormat( format );
        return simpleDateFormat.parse(date);
    }

    private static final Log LOGGER = LogFactory.getLog( DateHelper.class );
    
    public static final String FRENCH_DATE_PATTERN_SHORT = "dd/MM/yyyy";
    public static final String ENGLISH_DATE_PATTERN_SHORT = "yyyy-MM-dd";
    public static final String ENGLISH_DATE_PATTERN = "yyyy-MM-dd HH:mm";

    public static final String ORDERED_FORMAT_PLUS_GMT = "yyyy-MM-dd HH:mm:ss.SSSS Z";
    public static final String ORDERED_FORMAT = "yyyy-MM-dd HH:mm:ss.SSSS";
}