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package org.ow2.bonita.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public abstract class DateUtil {

  private DateUtil() {
  }

  public static final SimpleDateFormat DATE_FORMAT_1 = new SimpleDateFormat("yyyy/MM/dd/HH/mm/ss/SSS");
  public static final SimpleDateFormat DATE_FORMAT_2 = new SimpleDateFormat("yyyy/MM/dd/HH/mm/ss");
  // ISO-8601 requires the T between date and time.
  public static final SimpleDateFormat ISO_8601_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");

  public static Date parseDate(final String formattedDate) {
    Date result;
    try {
      result = DateUtil.DATE_FORMAT_1.parse(formattedDate);
    } catch (final ParseException e1) {
      try {
        result = DateUtil.DATE_FORMAT_2.parse(formattedDate);
      } catch (final ParseException e2) {
        try {
          result = DateUtil.ISO_8601_FORMAT.parse(formattedDate);
        } catch (final ParseException e3) {
          throw new IllegalArgumentException(formattedDate + " is not a formatted date." 
              + " Supported formats are " + DateUtil.DATE_FORMAT_2.toPattern() + ", "
              + DateUtil.DATE_FORMAT_1.toPattern() + " and (ISO-8601) " + DateUtil.ISO_8601_FORMAT.toPattern());
        }
      }
    }
    return result;
  }

  public static String format(final Date date) {
    return DateUtil.ISO_8601_FORMAT.format(date);
  }
}