// Copyright 2015 The Apache Software Foundation
//
// 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.apache.tapestry5.internal.jpa;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.apache.tapestry5.ioc.MethodAdviceReceiver;
import org.apache.tapestry5.jpa.EntityManagerManager;
import org.apache.tapestry5.jpa.EntityTransactionManager;
import org.apache.tapestry5.jpa.JpaTransactionAdvisor;
import org.apache.tapestry5.jpa.annotations.CommitAfter;
import org.apache.tapestry5.plastic.MethodAdvice;

public class JpaTransactionAdvisorImpl implements JpaTransactionAdvisor
{
    private final Map<String, MethodAdvice> methodAdvices;

    public JpaTransactionAdvisorImpl(EntityManagerManager manager,
            EntityTransactionManager transactionManager)
    {
        methodAdvices = new HashMap<>(manager.getEntityManagers().size());
        for (Map.Entry<String, EntityManager> entry : manager.getEntityManagers().entrySet())
            methodAdvices.put(entry.getKey(),
                    new CommitAfterMethodAdvice(transactionManager, entry.getKey()));
        methodAdvices.put(null, new CommitAfterMethodAdvice(transactionManager, null));
    }

    @Override
    public void addTransactionCommitAdvice(MethodAdviceReceiver receiver)
    {
        for (final Method m : receiver.getInterface().getMethods())
        {
            if (m.getAnnotation(CommitAfter.class) != null)
            {
                PersistenceContext annotation = receiver.getMethodAnnotation(m,
                        PersistenceContext.class);

                receiver.adviseMethod(m,
                        methodAdvices.get(annotation == null ? null : annotation.unitName()));
            }
        }
    }

}