/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

package org.pentaho.reporting.engine.classic.extensions.drilldown;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.reporting.engine.classic.extensions.drilldown.parser.DrillDownProfileCollection;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.resourceloader.Resource;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;

public class DrillDownProfileMetaData {
  private static final Log logger = LogFactory.getLog( DrillDownProfileMetaData.class );
  private static DrillDownProfileMetaData instance;
  private ResourceManager resourceManager;

  public static synchronized DrillDownProfileMetaData getInstance() {
    if ( instance == null ) {
      instance = new DrillDownProfileMetaData();
    }
    return instance;
  }

  private HashMap<String, DrillDownProfile> drillDownProfiles;

  private DrillDownProfileMetaData() {
    this.resourceManager = new ResourceManager();
    drillDownProfiles = new HashMap<String, DrillDownProfile>();
  }

  public void registerProfile( final DrillDownProfile profile ) {
    drillDownProfiles.put( profile.getName(), profile );
  }

  public void registerFromXml( final URL expressionMetaSource ) throws IOException {
    if ( expressionMetaSource == null ) {
      throw new NullPointerException( "Error: Could not find the expression meta-data description file" );
    }
    try {
      final Resource resource = resourceManager.createDirectly( expressionMetaSource,
        DrillDownProfileCollection.class );
      final DrillDownProfileCollection typeCollection = (DrillDownProfileCollection) resource.getResource();
      final DrillDownProfile[] types = typeCollection.getData();
      for ( int i = 0; i < types.length; i++ ) {
        final DrillDownProfile metaData = types[ i ];
        if ( metaData != null ) {
          registerProfile( metaData );
        }
      }
    } catch ( Exception e ) {
      DrillDownProfileMetaData.logger.error( "Failed:", e );
      throw new IOException( "Error: Could not parse the element meta-data description file" );
    }
  }

  public DrillDownProfile getDrillDownProfile( final String configIndicator ) {
    return drillDownProfiles.get( configIndicator );
  }

  public DrillDownProfile[] getDrillDownProfiles() {
    return drillDownProfiles.values().toArray( new DrillDownProfile[ drillDownProfiles.size() ] );
  }

  public String[] getDrillDownProfileNames() {
    return drillDownProfiles.keySet().toArray( new String[ drillDownProfiles.size() ] );
  }

  public DrillDownProfile[] getDrillDownProfileByGroup( final String group ) {
    final ArrayList<DrillDownProfile> profiles = new ArrayList<DrillDownProfile>();
    for ( final DrillDownProfile profile : drillDownProfiles.values() ) {
      if ( ObjectUtilities.equal( profile.getAttribute( "group" ), group ) ) {
        profiles.add( profile );
      }
    }
    return profiles.toArray( new DrillDownProfile[ profiles.size() ] );
  }
}