/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
    *
   * 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.argeo.cms.tabular;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.InputStream;
  import java.util.List;
  
  import javax.jcr.Binary;
  import javax.jcr.Node;
  import javax.jcr.Property;
  import javax.jcr.PropertyType;
  import javax.jcr.RepositoryException;
  
  import org.apache.commons.io.IOUtils;
  import org.argeo.api.tabular.TabularColumn;
  import org.argeo.api.tabular.TabularWriter;
  import org.argeo.cms.ArgeoTypes;
  import org.argeo.jcr.ArgeoJcrException;
  import org.argeo.jcr.JcrUtils;
  import org.argeo.util.CsvWriter;
  
  /** Write / reference tabular content in a JCR repository. */
  public class JcrTabularWriter implements TabularWriter {
  	private Node contentNode;
  	private ByteArrayOutputStream out;
  	private CsvWriter csvWriter;
  	
  	@SuppressWarnings("unused")
  	private final List<TabularColumn> columns;
  
  	/** Creates a table node */
  	public JcrTabularWriter(Node tableNode, List<TabularColumn> columns,
  			String contentNodeType) {
  		try {
  			this.columns = columns;
  			for (TabularColumn column : columns) {
  				String normalized = JcrUtils.replaceInvalidChars(column
  						.getName());
  				Node columnNode = tableNode.addNode(normalized,
  						ArgeoTypes.ARGEO_COLUMN);
  				columnNode.setProperty(Property.JCR_TITLE, column.getName());
  				if (column.getType() != null)
  					columnNode.setProperty(Property.JCR_REQUIRED_TYPE,
  							PropertyType.nameFromValue(column.getType()));
  				else
  					columnNode.setProperty(Property.JCR_REQUIRED_TYPE,
  							PropertyType.TYPENAME_STRING);
  			}
  			contentNode = tableNode.addNode(Property.JCR_CONTENT,
  					contentNodeType);
  			if (contentNodeType.equals(ArgeoTypes.ARGEO_CSV)) {
  				contentNode.setProperty(Property.JCR_MIMETYPE, "text/csv");
  				contentNode.setProperty(Property.JCR_ENCODING, "UTF-8");
  				out = new ByteArrayOutputStream();
  				csvWriter = new CsvWriter(out);
  			}
  		} catch (RepositoryException e) {
  			throw new ArgeoJcrException("Cannot create table node " + tableNode, e);
  		}
  	}
  
  	public void appendRow(Object[] row) {
  		csvWriter.writeLine(row);
  	}
  
  	public void close() {
  		Binary binary = null;
  		InputStream in = null;
  		try {
  			// TODO parallelize with pipes and writing from another thread
  			in = new ByteArrayInputStream(out.toByteArray());
  			binary = contentNode.getSession().getValueFactory()
  					.createBinary(in);
  			contentNode.setProperty(Property.JCR_DATA, binary);
  		} catch (RepositoryException e) {
  			throw new ArgeoJcrException("Cannot store data in " + contentNode, e);
  		} finally {
  			IOUtils.closeQuietly(in);
  			JcrUtils.closeQuietly(binary);
  		}
  	}
  }