/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *
 * $Id: EGIZDate.java,v 1.1 2006/10/31 08:08:33 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.pdf;

import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import org.apache.commons.lang.time.DateUtils;
import org.apache.log4j.Logger;

/**
 * Represents a signature date and the signing time as can be found in the
 * SIG_DATE field.
 * 
 * <p>
 * This is used to compare date values of signatures.
 * </p>
 * 
 * @author wprinz
 */
public class EGIZDate {
	
	private static final Logger LOG = Logger.getLogger(EGIZDate.class);

	protected Date date = null;
	
	// TODO remove deprecated old code
//	/**
//	 * The year.
//	 */
//	protected int year;
//
//	/**
//	 * The month.
//	 */
//	protected int month;
//
//	/**
//	 * The day.
//	 */
//	protected int day;
//
//	/**
//	 * The hour.
//	 */
//	protected int hour;
//
//	/**
//	 * The minute.
//	 */
//	protected int minute;
//
//	/**
//	 * The second.
//	 */
//	protected int second;
//
//	/**
//	 * Constructor that fills the date with values.
//	 * 
//	 * @param year
//	 *            The year.
//	 * @param month
//	 *            The month.
//	 * @param day
//	 *            The day.
//	 * @param hour
//	 *            The hour.
//	 * @param minute
//	 *            The minute.
//	 * @param second
//	 *            The second.
//	 */
//	public EGIZDate(int year, int month, int day, int hour, int minute,
//			int second) {
//		this.year = year;
//		this.month = month;
//		this.day = day;
//		this.hour = hour;
//		this.minute = minute;
//		this.second = second;
//	}

	
	/**
   * @param date
   */
  protected EGIZDate(Date date)
  {
    this.date = date;
  }

  /**
	 * Parses the date information from a given date value.
	 * 
	 * <p>
	 * Usually the date value is one extracted from the value of the SIG_DATE
	 * field.
	 * </p>
	 * 
	 * @param date_value
	 *            The date value String.
	 * @return Returns the parsed EGIZDate. An IllegalArgumentException is
	 *         thrown if the date String has an illegal format.
	 */
	public static EGIZDate parseFromString(String date_value) {
	  Date date = parseDateFromString(date_value);
//		Calendar calendar = new GregorianCalendar();
//		calendar.setTime(date);
		
		LOG.debug("Parsing date string \"" + date_value + "\" returns: " + date);

//		return new EGIZDate(calendar.get(Calendar.YEAR), calendar
//				.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH),
//				calendar.get(Calendar.HOUR), calendar.get(Calendar.MINUTE),
//				calendar.get(Calendar.SECOND));
		return new EGIZDate(date);

	}
	
	public static Date parseDateFromString (String date_value)
	{
	   // find the according RFC standard and cite it

    /*
     * Pattern date_pattern =
     * Pattern.compile("^\\d\\d\\d\\d-\\d\\d-\\d\\dT\\d\\d:\\d\\d:\\d\\d(Z|((\\+|\\-)\\d\\d:\\d\\d))?$");
     * Matcher date_matcher = date_pattern.matcher(date_value); if
     * (!date_matcher.matches()) { throw new IllegalArgumentException("The
     * date_value (" + date_value + ") has an illegal format."); } // for
     * some strange reasons capture groups don't work
     * 
     * int year = Integer.parseInt(date_value.substring(0, 4)); int month =
     * Integer.parseInt(date_value.substring(5, 7)); int day =
     * Integer.parseInt(date_value.substring(8, 10)); int hour =
     * Integer.parseInt(date_value.substring(11, 13)); int minute =
     * Integer.parseInt(date_value.substring(14, 16)); int second =
     * Integer.parseInt(date_value.substring(17, 19)); return new
     * EGIZDate(year, month, day, hour, minute, second);
     */

    String[] parsePatterns = { "yyyy-MM-dd'T'HH:mm:ss",
        "yyyy-MM-dd'T'HH:mm:ssZ", "yyyy-MM-dd'T'HH:mm:ssZZ" };    
    if (date_value.length() > 19) {
      int li = date_value.lastIndexOf(":");
      if (li >= 19) {
        date_value = new StringBuffer(date_value).deleteCharAt(li).toString();
      }
      // FIXME: @iaik: wenn man bei UTC+"Z" die letzten -2 Zeichen durch "UTC" ersetzt verliert die Zeit ihre Sekunden-Einerstelle!!!!!!!
      // alter code:
//      if (date_value.endsWith("Z")) {
//        date_value = date_value.substring(0, date_value.length()-2) + "UTC";
//      }
      // neuer code:
      if (date_value.endsWith("ZZ")) {
        date_value = date_value.substring(0, date_value.length()-2) + "UTC";
      }
      if (date_value.endsWith("Z")) {
        date_value = date_value.substring(0, date_value.length()-1) + "UTC";
      }
      
    } else  {     
      date_value += "UTC";
    }   
    
    Date date;    
    try {
      date = DateUtils.parseDate(date_value, parsePatterns);
    } catch (ParseException e) {
      throw new IllegalArgumentException("The date_value (" + date_value
          + ") has an illegal format.");
    }

		
//		return new EGIZDate(calendar.get(Calendar.YEAR), calendar
//				.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH),
//				calendar.get(Calendar.HOUR), calendar.get(Calendar.MINUTE),
//				calendar.get(Calendar.SECOND));

		// fixed by tknall: really bad bug: Calendar.HOUR means hour in 12-hour-mode instead f 24-hour. !!!!
		// this leads to false comparison of two dates where one date is prior noon and one after noon. 
//		return new EGIZDate(calendar.get(Calendar.YEAR), calendar
//				.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH),
//				calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE),
//				calendar.get(Calendar.SECOND));
    return date;

	}

	/**
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals(Object obj) {
		if (!(obj instanceof EGIZDate)) {
			return false;
		}

		EGIZDate other = (EGIZDate)obj;
		return this.date.equals(other.date);
	}

	/**
	 * @see java.lang.Object#hashCode()
	 */
	public int hashCode() {
		return this.date.hashCode();
	}

	 /**
   * @see java.lang.Object#toString()
   */
  public String toString()
  {
    return this.date.toString();
  }
	

//	/**
//	 * Converts the date to a long integer.
//	 * 
//	 * <p>
//	 * An earlier date is lower than a later date.
//	 * </p>
//	 * <p>
//	 * E.g. a date in 1999 will get a smaller number than a date in 2006.
//	 * </p>
//	 * 
//	 * @return Returns the compareable long.
//	 */
//	protected long toCompareableLong() {
//		return +this.year * 12 * 31 * 24 * 60 * 60 + this.month * 31 * 24 * 60
//				* 60 + this.day * 24 * 60 * 60 + this.hour * 60 * 60
//				+ this.minute * 60 + this.second;
//	}

  /**
	 * Compares this EGIZDate to another EXIZDate.
	 * 
	 * @param other
	 *            The other EGIZDate.
	 * @return Returns negative if this date is earlier (lower) than the other
	 *         date. Returns 0 if both dates are equal. Returns positive if this
	 *         date is later (higher) than the other date.
	 */
	public int compareTo(EGIZDate other) {
	  return this.date.compareTo(other.date);
//		long diff = toCompareableLong() - other.toCompareableLong();
//		return (int) diff;
	}

  /**
   * @return the date
   */
  public Date getDate()
  {
    return this.date;
  }

}