/*******************************************************************************
 * <copyright> Copyright 2014 by E-Government Innovation Center EGIZ, 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.
 ******************************************************************************/
package at.gv.egiz.pdfas.lib.impl.placeholder;

import java.io.IOException;

import org.apache.commons.lang3.StringUtils;

import at.gv.egiz.pdfas.common.exceptions.PDFASError;
import at.gv.egiz.pdfas.common.exceptions.PdfAsErrorCarrier;
import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
import at.gv.egiz.pdfas.common.settings.ISettings;
import at.gv.egiz.pdfas.lib.api.IConfigurationConstants;
import at.gv.egiz.pdfas.lib.impl.status.OperationStatus;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class PlaceholderFilter implements IConfigurationConstants,
		PlaceholderExtractorConstants {
  
	public static SignaturePlaceholderData checkPlaceholderSignatureLocation(
	    OperationStatus status, ISettings settings, String placeholderId) throws PdfAsException, IOException {
		
	  String signingProfile = status.getRequestedSignature().getSignatureProfileID();
	  
	  if (status.getSignParamter().isPlaceHolderSearchEnabled()) {	  
	    if (status.getPlaceholderConfiguration().isGlobalPlaceholderEnabled()) {		
	      String defaultPlaceHolderId = settings.getValue(PLACEHOLDER_ID);			
	      return status.getBackend().getPlaceholderExtractor().extract(
	          status.getPdfObject(), getPlaceHolderId(placeholderId, defaultPlaceHolderId) , 
	          getPlaceHolderMode(settings, PLACEHOLDER_MATCH_MODE_SORTED));

	    } else if (status.getPlaceholderConfiguration().isProfileConfigurationEnabled(signingProfile)) {
	      String defaultPlaceHolderId = status.getPlaceholderConfiguration().getProfilePlaceholderID(signingProfile);
	      return status.getBackend().getPlaceholderExtractor().extract(
	          status.getPdfObject(), getPlaceHolderId(placeholderId, defaultPlaceHolderId), 
	          getPlaceHolderMode(settings, 
	              StringUtils.isNotEmpty(defaultPlaceHolderId) ? PLACEHOLDER_MATCH_MODE_MODERATE : PLACEHOLDER_MATCH_MODE_SORTED));
	    }
	  } else {
	    log.debug("Searching placeholders are disabled for this request");
	    
	  }
	  
		return null;
	}
	
	private static int getPlaceHolderMode(ISettings settings, int defaultValue) throws PdfAsErrorCarrier {
    String placeholderModeString = settings.getValue(PLACEHOLDER_MODE);   
    if (StringUtils.isNotEmpty(placeholderModeString)) {
      try {
        int placeholderMode = Integer.parseInt(placeholderModeString);
        if (placeholderMode < PLACEHOLDER_MODE_MIN || placeholderMode > PLACEHOLDER_MODE_MAX) {
          throw new PdfAsErrorCarrier(new PDFASError(PDFASError.ERROR_INVALID_PLACEHOLDER_MODE));
          
        }
        return placeholderMode;
        
      } catch (NumberFormatException e) {
        throw new PdfAsErrorCarrier(new PDFASError(
            PDFASError.ERROR_INVALID_PLACEHOLDER_MODE, e));
      }
      
    } else {
      return defaultValue;
      
    }
	}
	
  private static String getPlaceHolderId(String requestId, String defaultValue) {
    if (StringUtils.isEmpty(requestId)) {
      return defaultValue;
      
    } else {
      return requestId;
      
    }    
  }
}