/*
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, 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.egovernment.moa.id.configuration.validation.oa;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import at.gv.egovernment.moa.id.commons.validation.ValidationHelper;
import at.gv.egovernment.moa.id.configuration.helper.LanguageHelper;
import at.gv.egovernment.moa.util.Base64Utils;
import at.gv.egovernment.moa.util.MiscUtil;
import lombok.extern.slf4j.Slf4j;

/**
 * @author tlenz
 *
 */
@Slf4j
public class OAFileUploadValidation {

  public List<String> validate(List<String> fileName, List<File> files,
      String errorMsgPreFix, Map<String, byte[]> output, HttpServletRequest request) {

    final List<String> errors = new ArrayList<>();

    if (fileName != null) {

      if (fileName.size() > 1) {
        log.info("Only one BKU-selecten template file can be stored");
        errors.add(LanguageHelper.getErrorString(errorMsgPreFix + ".file.selected", request));
      }

      for (int i = 0; i < fileName.size(); i++) {
        final String filename = fileName.get(i);

        if (MiscUtil.isNotEmpty(filename)) {
          if (ValidationHelper.containsNotValidCharacter(filename, false)) {
            log.info("Filename is not valid");
            errors.add(LanguageHelper.getErrorString(errorMsgPreFix + ".filename.valid", request));

          } else {
            try {
              final File file = files.get(i);
              final InputStream stream = new FileInputStream(file);
              output.put(filename, Base64Utils.encode(stream).getBytes("UTF-8"));
              stream.close();

            } catch (final IOException e) {
              log.info("File with FileName "
                  + filename + " can not be loaded.", e);
              errors.add(LanguageHelper.getErrorString(errorMsgPreFix + ".file.valid",
                  new Object[] { filename }, request));
            }
          }
        }
      }
    }

    return errors;
  }
}