/**
 * 
 */
package at.knowcenter.wag.egov.egiz.sig.sigid;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
import at.knowcenter.wag.egov.egiz.exceptions.SettingsException;

/**
 * @author wprinz
 *
 */
public class DetachedIdFormatter implements IdFormatter
{
  /**
   * The SIG_ID prefix.
   * Default value: etsi-bka-1.0
   */
  public static String SIG_ID_PREFIX = "etsi-bka-1.0"; //$NON-NLS-1$
  
  public static final String SIG_ID_KEY = "default.bku.algorithm.id";

  /**
   * The log.
   */
  private static Log log = LogFactory.getLog(DetachedIdFormatter.class);

  /**
   * @see at.knowcenter.wag.egov.egiz.sig.sigid.IdFormatter#formatIds(java.lang.String[])
   */
  public String formatIds(String[] ids)
  {
	// read SIG_ID_PREFIX from config file
	try {
		SIG_ID_PREFIX = SettingsReader.getInstance().getValueFromKey(SIG_ID_KEY);
	} catch (SettingsException e) {
		e.printStackTrace();
	}
	  
    // ids algorithm:
    String join = ""; //$NON-NLS-1$
    String base = null;
    for (int arr_idx = 0; arr_idx < ids.length; arr_idx++)
    {
      String id = ids[arr_idx];
      if (log.isDebugEnabled())
      {
        log.debug("Set BKU id:" + id); //$NON-NLS-1$
      }
      int id_idx = id.lastIndexOf("-"); //$NON-NLS-1$
      if (arr_idx == 0)
      {
        base = id.substring(0, id_idx);
      }
      String cur_id = id.substring(id_idx + 1);
      if (cur_id.equalsIgnoreCase("")) //$NON-NLS-1$
      {
        cur_id = "0"; //$NON-NLS-1$
      }

      join += "-" + cur_id; //$NON-NLS-1$
    }
    String idstr = base + "@" + join.substring(1); //$NON-NLS-1$
    String final_ids = SIG_ID_PREFIX + "@" + idstr;
    return final_ids;
  }

}