package fr.ifremer.tutti.service.csv;
   
   /*
    * #%L
    * Tutti :: Service
    * $Id:$
    * $HeadURL:$
    * %%
    * Copyright (C) 2012 - 2015 Ifremer
   * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU 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 General Public
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/gpl-3.0.html>.
   * #L%
   */
  
  import com.google.common.base.Charsets;
  import com.google.common.base.Preconditions;
  import com.google.common.io.Files;
  import org.apache.commons.lang3.builder.ToStringBuilder;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.nuiton.jaxx.application.ApplicationTechnicalException;
  
  import java.io.BufferedWriter;
  import java.io.Closeable;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Created on 2/6/15.
   *
   * @author Tony Chemit - chemit@codelutin.com
   * @since 3.13
   */
  public abstract class CsvProducer<O, M extends AbstractTuttiImportExportModel<O>> implements Closeable {
  
      /** Logger. */
      private static final Log log = LogFactory.getLog(CsvProducer.class);
  
      private final BufferedWriter writer;
  
      private final TuttiRepeatableExport<O> export;
  
      private boolean touch;
  
      private final String filename;
  
      public CsvProducer(Path file, M model) {
  
          Preconditions.checkNotNull(file, "CsvProducer need a not null file!");
          Preconditions.checkNotNull(model, "CsvProducer need a not null model!");
  
          this.filename = file.toString();
  
          try {
              this.writer = Files.newWriter(file.toFile(), Charsets.UTF_8);
          } catch (FileNotFoundException e) {
              // should never happen
              throw new ApplicationTechnicalException("file not found " + file, e);
          }
  
          this.export = new TuttiRepeatableExport<>(model);
  
      }
  
      @Override
      public void close() throws IOException {
          writer.close();
      }
  
      public void write(O row) throws Exception {
          if (row != null) {
              List<O> rows = new ArrayList<>(1);
              rows.add(row);
              write(rows);
          }
      }
  
      public void write(List<O> rows) throws Exception {
          if (rows != null) {
              if (!touch) {
  
                  if (log.isDebugEnabled()) {
                      log.debug("CsvProducer " + this + " touched.");
                 }
                 touch = true;
 
             }
             export.write(rows, writer);
         }
     }
 
     public void writeEmpty() throws Exception {
         write(Collections.<O>emptyList());
     }
 
     public boolean wasTouched() {
         return touch;
     }
 
     @Override
     public String toString() {
         return new ToStringBuilder(this).append("filename", filename).toString();
     }
 }