/*!
* 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.pentaho.reporting.engine.classic.core.util.beans.BeanException;
import org.pentaho.reporting.engine.classic.core.util.beans.ConverterRegistry;
import org.pentaho.reporting.libraries.base.util.URLEncoder;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;

import java.io.UnsupportedEncodingException;
import java.text.MessageFormat;

public class PatternLinkCustomizer implements LinkCustomizer {
  public PatternLinkCustomizer() {
  }

  public String format( final FormulaContext formulaContext,
                        final String configIndicator,
                        final String reportPath,
                        final ParameterEntry[] entries ) throws EvaluationException {
    try {
      final String parameter = computeParameter( formulaContext, entries );
      final String pattern = computePattern( configIndicator );
      final MessageFormat messageFormat =
        new MessageFormat( pattern, formulaContext.getLocalizationContext().getLocale() );
      return messageFormat.format( new Object[] { reportPath, parameter } );
    } catch ( UnsupportedEncodingException e ) {
      throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE );
    } catch ( BeanException e ) {
      throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE );
    }
  }

  public static String computeParameter( final FormulaContext formulaContext, final ParameterEntry[] entries )
    throws UnsupportedEncodingException, BeanException {
    final String encoding = formulaContext.getConfiguration().getConfigProperty
      ( "org.pentaho.reporting.libraries.formula.URLEncoding", "UTF-8" );
    final StringBuilder parameter = new StringBuilder( 1000 );
    for ( int i = 0; i < entries.length; i++ ) {
      final ParameterEntry entry = entries[ i ];
      if ( i != 0 ) {
        parameter.append( '&' );
      }
      final Object value = entry.getParameterValue();
      if ( value instanceof Object[] ) {
        final Object[] array = (Object[]) value;
        for ( int j = 0; j < array.length; j++ ) {
          if ( j != 0 ) {
            parameter.append( '&' );
          }
          final Object o = array[ j ];
          parameter.append( URLEncoder.encode( entry.getParameterName(), encoding ) );
          parameter.append( '=' );
          parameter.append( URLEncoder.encode( ConverterRegistry.toAttributeValue( o ), encoding ) );
        }
      } else if ( value != null ) {
        parameter.append( URLEncoder.encode( entry.getParameterName(), encoding ) );
        parameter.append( '=' );
        parameter.append( URLEncoder.encode( ConverterRegistry.toAttributeValue( value ), encoding ) );
      } else {
        parameter.append( URLEncoder.encode( entry.getParameterName(), encoding ) );
        parameter.append( '=' );
      }
    }
    return parameter.toString();
  }

  private String computePattern( final String configIndicator ) throws EvaluationException {
    final DrillDownProfile downProfile = DrillDownProfileMetaData.getInstance().getDrillDownProfile( configIndicator );
    return (String) downProfile.getAttribute( "pattern" );
  }

}