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/*
  GRANITE DATA SERVICES
  Copyright (C) 2012 GRANITE DATA SERVICES S.A.S.

  This file is part of Granite Data Services.

  Granite Data Services is free software; you can redistribute it and/or modify
  it under the terms of the GNU Library General Public License as published by
  the Free Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  Granite Data Services 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 Library General Public License
  for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; if not, see .
*/

package org.granite.client.tide.cdi;

import java.lang.annotation.Annotation;

import javax.enterprise.context.ContextNotActiveException;
import javax.enterprise.context.spi.Context;
import javax.enterprise.context.spi.Contextual;
import javax.enterprise.context.spi.CreationalContext;

import org.granite.client.tide.ViewScope;
import org.granite.client.tide.ViewScope.BeanResetter;
import org.granite.client.tide.ViewScopeHolder;

/**
 * @author William DRAI
 */
public class ViewContext implements Context {
	
	// private static final Logger log = Logger.getLogger(ViewScope.class);
	
	private ViewScope beanCache;
	
	public ViewContext() {
	}
	
	private ViewScope getBeanCache() {
		if (beanCache == null) {
			beanCache = ViewScopeHolder.get();
			if (beanCache == null)
				throw new RuntimeException("View bean cache not set");
		}
		return beanCache;
	}
	
	@Override
	public  T get(Contextual bean) {
		return get(bean, null);
	}

	@Override
	public  T get(Contextual bean, CreationalContext cc) {
		if (!isActive())
			throw new ContextNotActiveException();
		
		if (bean == null)
			throw new IllegalArgumentException("bean cannot be null");
		
		String id = buildId(bean);
		@SuppressWarnings("unchecked")
		T instance = (T)getBeanCache().get(id);
		if (instance != null)
			return instance;
		
		if (cc == null)
			return null;
		
		instance = bean.create(cc);
		getBeanCache().put(id, instance);
		getBeanCache().addResetter(id, new ViewBeanResetter(bean, cc));
		
		return instance;
	}
	
	private  String buildId(Contextual contextual) {
		return contextual.getClass().getName() + "#" + contextual.hashCode();
	}
	
	@Override
	public Class getScope() {
		return ViewScoped.class;
	}
	
	@Override
	public boolean isActive() {
		return getBeanCache() != null;
	}
	
	public static class ViewBeanResetter implements BeanResetter {
		
		private final Contextual bean;
		private final CreationalContext cc;
		
		public ViewBeanResetter(Contextual bean, CreationalContext cc) {
			this.bean = bean;
			this.cc = cc;
		}
		
		@SuppressWarnings("unchecked")
		public void reset(Object instance) {
			bean.destroy((T)instance, cc);
		}
		
	}
	
}