/**
    * Copyright 2010-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.common.jdbc.convert;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.kuali.common.util.Assert;
  import org.kuali.common.util.SimpleScanner;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class DirectoryConverter {
  
      public static final String CONVERTED_EXTENSION = ".converted";
  
      private static final Logger logger = LoggerFactory.getLogger(DirectoryConverter.class);
  
      public void convert(DirectoryContext context) {
          logger.info("Scanning directory " + context.getDirectory().getAbsolutePath());
          logger.info("Included file pattern: " + context.getInclude());
          logger.info("Excluded file pattern: " + context.getExclude());
  		SimpleScanner scanner = new SimpleScanner(context.getDirectory(), context.getInclude(), context.getExclude());
  		List<File> oldFiles = scanner.getFiles();
          logger.info("Found " + oldFiles.size() + " files for conversion");
  		List<File> newFiles = getNewFiles(oldFiles);
          List<ConversionResult> results = convert(context, oldFiles, newFiles);
  
          logger.info("Conversion complete");
          if(context.getPostProcessor() != null) {
              logger.info("Initiating post conversion processor of type: " + context.getPostProcessor().getClass().getName());
              context.getPostProcessor().process(results);
          }
  	}
  
  	protected List<ConversionResult> convert(DirectoryContext context, List<File> oldFiles, List<File> newFiles) {
  		// The lists must be the same size
  		Assert.isTrue(oldFiles.size() == newFiles.size());
  
  		SqlConverter converter = context.getConverter();
  		List<ConversionResult> results = new ArrayList<ConversionResult>();
  		for (int i = 0; i < oldFiles.size(); i++) {
  			File oldFile = oldFiles.get(i);
  			File newFile = newFiles.get(i);
  			ConversionContext cc = new ConversionContext();
  			cc.setNewFile(newFile);
  			cc.setOldFile(oldFile);
  			ConversionResult result = converter.convert(cc);
  			results.add(result);
  		}
  		return results;
  	}
  
  	protected List<File> getNewFiles(List<File> oldFiles) {
  		List<File> newFiles = new ArrayList<File>();
  		for (File oldFile : oldFiles) {
  			File newFile = new File(oldFile.getAbsolutePath() + CONVERTED_EXTENSION);
  			newFiles.add(newFile);
  		}
  		return newFiles;
  	}
  }