/*
    * Copyright (c) 2006-present the original author or authors.
    *
    * 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.codehaus.gmaven.adapter.impl;
  
  import java.util.Map;
  
  import javax.annotation.Nullable;
  
  import groovy.lang.Binding;
  import groovy.lang.GroovyClassLoader;
  import org.codehaus.gmaven.adapter.ResourceLoader;
  import org.codehaus.gmaven.adapter.ShellRunner;
  import org.codehaus.groovy.tools.shell.Groovysh;
  import org.codehaus.groovy.tools.shell.IO;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  /**
   * Default {@link ShellRunner} implementation.
   *
   * @since 2.0
   */
  public class ShellRunnerImpl
      implements ShellRunner
  {
    private final Logger log = LoggerFactory.getLogger(getClass());
  
    private final GroovyRuntimeImpl runtime;
  
    ShellRunnerImpl(final GroovyRuntimeImpl runtime) {
      this.runtime = checkNotNull(runtime);
    }
  
    @Override
    public void run(final ClassLoader classLoader,
                    final ResourceLoader resourceLoader,
                    final Map<String, Object> context,
                    final @Nullable Map<String, Object> options)
        throws Exception
    {
      checkNotNull(classLoader);
      checkNotNull(resourceLoader);
      checkNotNull(context);
  
      log.trace("Running; class-loader: {}, resource-loader: {}, context: {}",
          classLoader, resourceLoader, context);
  
      GroovyClassLoader gcl = runtime.createGroovyClassLoader(classLoader, resourceLoader);
      Binding binding = runtime.createBinding(context);
  
      Groovysh shell = new Groovysh(gcl, binding, new IO());
  
      if (options != null) {
        configureOptions(shell, options);
      }
  
      try {
        shell.run(null);
      }
      finally {
        gcl.clearCache();
      }
    }
  
    private void configureOptions(final Groovysh shell, final Map<String, Object> options) {
      // TODO:
    }
  }