package fr.ifremer.quadrige2.core.dao.technical;
   
   /*-
    * #%L
    * Quadrige2 Core :: Quadrige2 Core Shared
    * $Id:$
    * $HeadURL:$
    * %%
    * Copyright (C) 2017 Ifremer
   * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU Affero General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   * #L%
   */
  
  
  
  import com.google.common.base.Preconditions;
  import com.google.common.base.Splitter;
  import fr.ifremer.quadrige2.core.exception.Quadrige2TechnicalException;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.nuiton.version.Version;
  import org.nuiton.version.Versions;
  
  import java.text.SimpleDateFormat;
  import java.util.Calendar;
  import java.util.Date;
  import java.util.TimeZone;
  
  /**
   * <p>DateVersions class.</p>
   */
  public class DateVersions {
  
      /**
       * <p>Constructor for DateVersions.</p>
       */
      protected DateVersions() {
          // Helper class
      }
  
      private static final Log log = LogFactory.getLog(DateVersions.class);
  
      /**
       * convert a version to a date
       *
       * ex: version = 2014.9.22.115930 will return 2014-09-22 11:59:30
       *
       * @param version a {@link org.nuiton.version.Version} object.
       * @return a {@link java.util.Date} object.
       */
      public static Date convertVersion2Date(Version version) {
          Preconditions.checkNotNull(version);
          return convertVersion2Date(version.toString(), null);
      }
  
      /**
       * convert a version to a date
       *
       * ex: version = 2014.9.22.115930 will return 2014-09-22 11:59:30
       *
       * @param version a {@link String} object.
       * @param timezone a {@link TimeZone} object.
       * @return a {@link Date} object.
       */
      public static Date convertVersion2Date(String version, TimeZone timezone) {
          Preconditions.checkNotNull(version);
  
          String[] versionParts = Splitter.on('.').splitToList(version).toArray(new String[4]);
  
          Calendar result = Calendar.getInstance(timezone != null ? timezone : TimeZone.getDefault());
  
          boolean parseError = false;
          try {
              // year 
              int year = Integer.parseInt(versionParts[0]);
              result.set(Calendar.YEAR, year);
  
              // month 
              int month = Integer.parseInt(versionParts[1]);
              result.set(Calendar.MONTH, month - 1);
  
              // day 
              int day = Integer.parseInt(versionParts[2]);
              result.set(Calendar.DAY_OF_MONTH, day);
  
              if (StringUtils.isBlank(versionParts[3])) {
                 result.set(Calendar.SECOND, 0);
                 result.set(Calendar.MINUTE, 0);
                 result.set(Calendar.HOUR_OF_DAY, 0);
             }
             else {
                 String time = versionParts[3];
                 if (time.length() > 6) {
                     parseError = true;
                 }
                 else {
                     time = StringUtils.leftPad(time, 6, '0');
 
                     // seconds
                     int seconds = Integer.parseInt(time.substring(time.length() - 2));
                     result.set(Calendar.SECOND, seconds);
 
                     // minutes
                     int minutes = Integer.parseInt(time.substring(time.length() - 4, time.length() - 2));
                     result.set(Calendar.MINUTE, minutes);
 
                     // hours
                     int hours = Integer.parseInt(time.substring(0, time.length() - 4));
                     result.set(Calendar.HOUR_OF_DAY, hours);
                 }
             }
 
             // no milliseconds
             result.set(Calendar.MILLISECOND, 0);
 
         } catch (Exception ex) {
             parseError = true;
         }
         if (parseError) {
             throw new Quadrige2TechnicalException(String.format("the database version '%s' can't be converted to a synchronization date", version));
         }
 
         return result.getTime();
     }
 
     /**
      * convert a version to a date, with no parse error
      *
      * ex: version = 2014.9.22.115930 will return 2014-09-22 11:59:30
      *
      * @param version a {@link String} object.
      * @param timezone a {@link TimeZone} object.
      * @return the date, or null if parse error
      */
     public static Date safeConvertVersion2Date(String version, TimeZone timezone) {
         if (StringUtils.isBlank(version)) {
             return null;
         }
         try {
             return convertVersion2Date(version, timezone);
         } catch (Quadrige2TechnicalException e) {
             log.error(e.getMessage(), e);
         }
         return null;
     }
 
     /**
      * convert a version to a date, with no parse error
      *
      * ex: version = 2014.9.22.115930 will return 2014-09-22 11:59:30
      *
      * @param version a {@link String} object.
      * @return the date, or null if parse error
      */
     public static Date safeConvertVersion2Date(String version) {
         return convertVersion2Date(version, null);
     }
 
     /**
      * Convert a date into Version, using format 'yyyy.MM.dd.HHmmss'
      *
      * @param date a not null date
      * @return a {@link org.nuiton.version.Version} object.
      */
     public static Version convertDate2Version(Date date) {
         return convertDate2Version(date, null);
     }
 
     /**
      * Convert a date into Version, using format 'yyyy.MM.dd.HHmmss'
      *
      * @param date a not null date
      * @return a {@link Version} object.
      */
     public static Version convertDate2Version(Date date, TimeZone timezone) {
         Preconditions.checkNotNull(date);
 
         SimpleDateFormat formatter = new SimpleDateFormat("yyyy.MM.dd.HHmmss");
         if (timezone != null) formatter.setTimeZone(timezone);
         String dateStr = formatter.format(date);
         return Versions.valueOf(dateStr);
     }
 }