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/*
 * Copyright (c) 2010 Mysema Ltd.
 * All rights reserved.
 * 
 */
package com.mysema.rdfbean.query;

import java.util.Calendar;

import org.joda.time.DateTime;

import com.google.common.base.Strings;
import com.mysema.converters.DateTimeConverter;

/**
 * @author tiwe
 */
public final class QueryFunctions {

    private static final DateTimeConverter dateTime = new DateTimeConverter();

    public static int dayOfMonth(String str) {
        return dateTime.fromString(str).getDayOfMonth();
    }

    public static int dayOfWeek(String str) {
        int dow = dateTime.fromString(str).getDayOfWeek();
        return dow == 7 ? 1 : dow + 1;
    }

    public static int dayOfYear(String str) {
        return dateTime.fromString(str).getDayOfYear();
    }

    public static double ceil(String str) {
        return Math.ceil(Double.valueOf(str));
    }

    public static double floor(String str) {
        return Math.floor(Double.valueOf(str));
    }

    public static int hour(String str) {
        return dateTime.fromString(str).getHourOfDay();
    }

    public static boolean like(String str, String likeExpression) {
        String regex = likeExpression.replace("%", ".*").replaceAll("_", ".");
        return str.matches(regex);
    }

    public static int millisecond(String str) {
        return dateTime.fromString(str).getMillisOfSecond();
    }

    public static int minute(String str) {
        return dateTime.fromString(str).getMinuteOfHour();
    }

    public static int month(String str) {
        return dateTime.fromString(str).getMonthOfYear();
    }

    public static int second(String str) {
        return dateTime.fromString(str).getSecondOfMinute();
    }

    public static String space(int amount) {
        return Strings.repeat(" ", amount);
    }

    public static double sqrt(String str) {
        return Math.sqrt(Double.valueOf(str));
    }

    public static int week(String str) {
        return dateTime.fromString(str).toGregorianCalendar().get(Calendar.WEEK_OF_YEAR);
    }

    public static int year(String str) {
        return dateTime.fromString(str).getYear();
    }

    public static int yearMonth(String str) {
        DateTime date = dateTime.fromString(str);
        return date.getYear() * 100 + date.getMonthOfYear();
    }

    private QueryFunctions() {
    }

}