/*
    * 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.EventObject;
  import java.util.Map;
  
  import javax.annotation.Nullable;
  
  import groovy.lang.Binding;
  import groovy.lang.GroovyClassLoader;
  import groovy.ui.Console;
  import org.codehaus.gmaven.adapter.ConsoleWindow;
  import org.codehaus.gmaven.adapter.ResourceLoader;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  /**
   * Default {@link ConsoleWindow} implementation.
   *
   * @since 2.0
   */
  public class ConsoleWindowImpl
      implements ConsoleWindow
  {
    private final Logger log = LoggerFactory.getLogger(getClass());
  
    private final GroovyRuntimeImpl runtime;
  
    private final Object lock = new Object();
  
    ConsoleWindowImpl(final GroovyRuntimeImpl runtime) {
      this.runtime = checkNotNull(runtime);
    }
  
    @Override
    public WindowHandle open(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("Opening; class-loader: {}, resource-loader: {}, context: {}",
          classLoader, resourceLoader, context);
  
      final GroovyClassLoader gcl = runtime.createGroovyClassLoader(classLoader, resourceLoader);
      Binding binding = runtime.createBinding(context);
  
      // FIXME: Sort out how we can avoid IDEA from thinking a sub-class of this needs to have additional overrides
      // FIXME: Its complaining about the synthetic methods which are dynamically added to GroovyObject instances
      // FIXME: Perhaps we can install exit lock notification via an event listener instead?
  
      final Console console = new Console(gcl, binding)
      {
        public void exit(final EventObject event) {
          try {
            super.exit(event);
          }
          finally {
            synchronized (lock) {
              lock.notifyAll();
            }
          }
        }
      };
  
      if (options != null) {
        configureOptions(console, options);
      }
  
      log.trace("Opening");
      console.run();
  
      return new WindowHandle()
      {
        @Override
        public void close() {
          log.trace("Closing");
          console.exit();
          cleanup();
       }
 
       @Override
       public void await() throws InterruptedException {
         log.trace("Waiting");
         synchronized (lock) {
           lock.wait();
         }
         cleanup();
       }
 
       private void cleanup() {
         gcl.clearCache();
       }
     };
   }
 
   private void configureOptions(final Console console, final Map<String, Object> options) {
     // TODO
   }
 }