/*
   * Copyright © 2012 Eirik Bjornset.
   * 
   * 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 net.grinderscript.dotnet.scriptengine;
  
  import static java.util.Collections.emptyList;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import net.grinder.common.GrinderProperties;
  import net.grinder.engine.common.EngineException;
  import net.grinder.engine.common.ScriptLocation;
  import net.grinder.scriptengine.Instrumenter;
  import net.grinder.scriptengine.ScriptEngineService;
  import net.grinder.util.FileExtensionMatcher;
  
  /**
   * .Net script engine.
   * 
   * @author Eirik Bjornset
   */
  public class DotNetScriptEngineService implements ScriptEngineService {
  
  	private final Logger logger = LoggerFactory
  			.getLogger(DotNetScriptEngineService.class);
  	
  	private final FileExtensionMatcher dllFileMatcher = new FileExtensionMatcher(".dll");
  
  	private final GrinderProperties properties;
  	private final DotNetScriptEngineFactory factory;
  
  	DotNetScriptEngineService(GrinderProperties properties, DotNetScriptEngineFactory factory) {
  		logger.trace("ctor: Enter, properties = {}, factory = {}", properties, factory);
  		this.properties = properties;
  		this.factory = factory;
  		logger.trace("ctor: Exit");
  	}
  	
  	public DotNetScriptEngineService(GrinderProperties properties) {
  		this(properties, new DotNetScriptEngineFactory.Default());
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	@Override public List<? extends Instrumenter> createInstrumenters()
  			throws EngineException {
  		return emptyList();
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	@Override public ScriptEngine createScriptEngine(ScriptLocation script)
  			throws EngineException {
  		logger.trace("createScriptEngine: Enter, script = {}", script);
  		ScriptEngine result = null;
  		if (dllFileMatcher.accept(script.getFile())) {
  			DotNetScriptEngine engine = factory.createScriptEngine(properties, script);
  			try {
  				engine.initialize();
  			} catch (IOException e) {
  				throw new EngineException("Could not initalize the CLR bridge",
  						e);
  			}
  			result = engine;
  		}
  		logger.trace("createScriptEngine: Exit, result = {}", result);
  		return result;
  	}
  
  	GrinderProperties getProperties()
  	{
  		return properties;
  	}
  	
  	DotNetScriptEngineFactory getFactory() {
  		return factory;
  	}
  }