/*
 * Copyright 2005-2010 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.wamblee.test.persistence;

import javax.persistence.EntityManager;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.wamblee.test.persistence.JpaTester;
import org.wamblee.test.persistence.TransactionProxyFactory;
import org.wamblee.test.persistence.JpaBuilder.JpaUnitOfWork;

import static junit.framework.TestCase.*;
import static org.mockito.Mockito.*;

public class TransactionProxyFactoryTestBase {

    public static interface Service {
        int execute(int aValue) throws Exception;
    }

    private JpaTester jpaTester;

    @Before
    public void setUp() throws Exception {
        jpaTester = new JpaTester(new MyPersistenceUnit());
        jpaTester.start();
    }

    @After
    public void tearDown() throws Exception {
        jpaTester.stop();
    }

    @Test
    public void testServiceIsInvoked() throws Exception {
        TransactionProxyFactory<Service> factory = new TransactionProxyFactory<Service>(
            jpaTester.getJpaBuilder(), Service.class);
        Service service = mock(Service.class);
        when(service.execute(10)).thenReturn(200);
        Service proxy = factory.getProxy(service);
        int res = proxy.execute(10);
        assertEquals(200, res);
        verify(service).execute(10);
    }

    @Test
    public void testServiceThrowsException() throws Exception {
        TransactionProxyFactory<Service> factory = new TransactionProxyFactory<Service>(
            jpaTester.getJpaBuilder(), Service.class);
        Service service = mock(Service.class);
        when(service.execute(10)).thenThrow(new RuntimeException("xyz"));
        Service proxy = factory.getProxy(service);
        try {
            int res = proxy.execute(10);
            fail();
        } catch (RuntimeException e) {
            assertEquals("xyz", e.getMessage());
        }
    }

    @Test
    public void testEntityManagerIsPassed() throws Exception {
        
       
        final TransactionProxyFactory<Service> factory = new TransactionProxyFactory<Service>(
            jpaTester.getJpaBuilder(), Service.class);
        Service service = new Service() { 
            private EntityManager em = factory.getTransactionScopedEntityManager();
            
            @Override
            public int execute(int aValue) throws Exception {
                assertNotNull(em);
                assertTrue(em.isOpen());
                return 0;
            }
        };
        
        final Service proxy = factory.getProxy(service);
        jpaTester.getJpaBuilder().execute(new JpaUnitOfWork<Void>() {
            @Override
            public Void execute(EntityManager aEm) throws Exception {
                assert(aEm != null); 
                proxy.execute(10);
                return null; 
            }
        });
    }

}