package eu.dnetlib.springutils.aop;

import static org.junit.Assert.*; // NOPMD
import static org.mockito.Mockito.*; // NOPMD

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;

import org.aopalliance.intercept.MethodInvocation;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 * test the methodcache AOP interceptor.
 * 
 * @author marko
 *
 */
public class MethodCacheInterceptorTest {

	private static final String TEST_VALUE = "mockedTestValue";
	private transient CacheManager singletonManager;
	private transient Cache cache;
	private transient MethodInvocation inv;
	private transient MethodInvocation invArgs;
	private transient MethodCacheInterceptor inter;

	@Before
	public void setUp() throws Throwable {
		singletonManager = CacheManager.create();
		singletonManager.addCache("testCache");
		cache = singletonManager.getCache("testCache");
		
		inter = new MethodCacheInterceptor();
		inter.setCache(cache);
		
		final MethodCacheInterceptorTest _this = mock(MethodCacheInterceptorTest.class);	
		
		inv = mock(MethodInvocation.class);
		final Method method = MethodCacheInterceptorTest.class.getDeclaredMethod("test");
	
		when(inv.getThis()).thenReturn(_this);
		when(inv.getMethod()).thenReturn(method);
		
		when(inv.proceed()).thenReturn(TEST_VALUE);
		
		// second method
		invArgs = mock(MethodInvocation.class);
		final Method methodArgs = MethodCacheInterceptorTest.class.getDeclaredMethod("testWithArgs", String.class);
		
		when(invArgs.getThis()).thenReturn(_this);
		when(invArgs.getMethod()).thenReturn(methodArgs);
		when(invArgs.getArguments()).thenReturn(new Object[] {"test1"});
		when(invArgs.proceed()).thenReturn("mockedTestValueWithArgs");
		
	}

	@After
	public void tearDown() throws Exception {
		singletonManager.removalAll();
	}

	@Test
	public void testCache() {
		cache.put(new Element("key", "value"));
		assertEquals("check cache", "value", cache.get("key").getValue());
	}

	@Test
	public void testInterceptor() throws Throwable {
		assertEquals("first invocation", TEST_VALUE, inter.invoke(inv));
		assertEquals("cached invocation", TEST_VALUE, inter.invoke(inv));

		// real method has to be called only once
		verify(inv).proceed();
	}

	@Test
	public void testFlush() throws Throwable {
		assertEquals("first invocation", TEST_VALUE, inter.invoke(inv));
		cache.flush();
		assertEquals("cache not flushed", TEST_VALUE, inter.invoke(inv));

		// since cache is flushed, the method is called twice
		verify(inv, times(2)).proceed();
	}

	@Test
	public void testWithArguments() throws Throwable {
		assertEquals("first invocation", "mockedTestValueWithArgs", inter.invoke(invArgs));
		assertEquals("cached invocation", "mockedTestValueWithArgs", inter.invoke(invArgs));
		verify(invArgs).proceed();
	}

	/**
	 * This method is only needed because of it's signature.
	 * 
	 * @return dummy
	 */
	public String test() { // NOPMD
		return null;
	}

	/**
	 * This method is only needed because of it's signature.
	 * 
	 * @param arg dummy
	 * @return dummy
	 */
	public String testWithArgs(String arg) { // NOPMD
		return null;
	}

	/**
	 * ensure that the spring lifecycle works.
	 * 
	 * @throws NoSuchMethodException
	 *             reflection
	 * @throws InvocationTargetException
	 *             reflection
	 * @throws IllegalAccessException
	 *             reflection
	 */
	@Test
	public void testAfterPropertiesSet() throws IllegalAccessException, InvocationTargetException,
			NoSuchMethodException {
		inter.getClass().getMethod("afterPropertiesSet").invoke(inter);
		assertNotNull("dummy", inter);
	}

	/**
	 * test write only.
	 */
	@Test
	public void testSetWriteOnly() {
		assertFalse("getter", inter.isWriteOnly());
		inter.setWriteOnly(true);
		assertTrue("getter", inter.isWriteOnly());
	}

}