/*!
* 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.
*/

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package org.pentaho.reporting.engine.classic.extensions.charting.runtime;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.Script;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * @author pdpi
 */
public abstract class BaseScript implements Script {
  private static final Log logger = LogFactory.getLog( BaseScript.class );
  private String source;
  private String rootPath;
  private Scriptable scope;

  BaseScript() {
  }

  BaseScript( final String source ) {
    this.source = source.replaceAll( "\\\\", "/" ).replaceAll( "/+", "/" );
    this.rootPath = this.source.replaceAll( "(.*/).*", "$1" );
  }

  public void initializeObjects() {
    final Context context = ContextFactory.getGlobal().enterContext();
    try {
      final Object wrappedFactory = Context.javaToJS( new DatasourceFactory(), scope );
      ScriptableObject.putProperty( scope, "datasourceFactory", wrappedFactory );
    } finally {
      context.exit();
    }
  }

  public void setScope( final Scriptable scope ) {
    this.scope = scope;
    if ( scope instanceof BaseScope ) {
      final BaseScope baseScope = (BaseScope) scope;
      baseScope.setBasePath( this.rootPath );
    }
    initializeObjects();
  }

  protected void executeScript( final Map<String, Object> params ) {
    final Context cx = Context.getCurrentContext();
    // env.js has methods that pass the 64k Java limit, so we can't compile
    // to bytecode. Interpreter mode to the rescue!
    cx.setOptimizationLevel( -1 );
    cx.setLanguageVersion( Context.VERSION_1_7 );

    final Object wrappedParams;
    if ( params != null ) {
      wrappedParams = Context.javaToJS( params, scope );
    } else {
      wrappedParams = Context.javaToJS( new HashMap<String, Object>(), scope );
    }

    try {
      ScriptableObject.defineProperty( scope, "params", wrappedParams, 0 );
      cx.evaluateReader( scope, new FileReader( source ), this.source, 1, null );
    } catch ( IOException ex ) {
      logger.error( "Failed to read " + source + ": " + ex.toString() );
    }
  }
}