/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.flink.api.java.typeutils.runtime.kryo;

import org.apache.flink.api.common.ExecutionConfig;

import org.apache.flink.api.java.typeutils.GenericTypeInfo;
import org.apache.flink.core.fs.Path;
import org.junit.Assert;
import org.junit.Test;

import java.util.ArrayList;
import java.util.HashSet;

import static org.junit.Assert.assertTrue;

public class SerializersTest {

	// recursive
	public static class Node {
		private Node parent;
	}
	
	public static class FromNested {
		Node recurseMe;
	}
	
	public static class FromGeneric1 {}
	public static class FromGeneric2 {}
	
	public static class Nested1 {
		private FromNested fromNested;
		private Path yodaInterval;
	}

	public static class ClassWithNested {
		
		Nested1 nested;
		int ab;
		
		ArrayList<FromGeneric1> addGenType;
		FromGeneric2[] genericArrayType;
	}

	@Test
	public void testTypeRegistration() {
		ExecutionConfig conf = new ExecutionConfig();
		Serializers.recursivelyRegisterType(ClassWithNested.class, conf, new HashSet<Class<?>>());
		
		KryoSerializer<String> kryo = new KryoSerializer<>(String.class, conf); // we create Kryo from another type.

		Assert.assertTrue(kryo.getKryo().getRegistration(FromNested.class).getId() > 0);
		Assert.assertTrue(kryo.getKryo().getRegistration(ClassWithNested.class).getId() > 0);
		Assert.assertTrue(kryo.getKryo().getRegistration(Path.class).getId() > 0);
		
		// check if the generic type from one field is also registered (its very likely that
		// generic types are also used as fields somewhere.
		Assert.assertTrue(kryo.getKryo().getRegistration(FromGeneric1.class).getId() > 0);
		Assert.assertTrue(kryo.getKryo().getRegistration(FromGeneric2.class).getId() > 0);
		Assert.assertTrue(kryo.getKryo().getRegistration(Node.class).getId() > 0);
		
		
		// register again and make sure classes are still registered
		ExecutionConfig conf2 = new ExecutionConfig();
		Serializers.recursivelyRegisterType(ClassWithNested.class, conf2, new HashSet<Class<?>>());
		KryoSerializer<String> kryo2 = new KryoSerializer<>(String.class, conf);
		assertTrue(kryo2.getKryo().getRegistration(FromNested.class).getId() > 0);
	}

	@Test
	public void testTypeRegistrationFromTypeInfo() {
		ExecutionConfig conf = new ExecutionConfig();
		Serializers.recursivelyRegisterType(new GenericTypeInfo<>(ClassWithNested.class), conf, new HashSet<Class<?>>());

		KryoSerializer<String> kryo = new KryoSerializer<>(String.class, conf); // we create Kryo from another type.

		assertTrue(kryo.getKryo().getRegistration(FromNested.class).getId() > 0);
		assertTrue(kryo.getKryo().getRegistration(ClassWithNested.class).getId() > 0);
		assertTrue(kryo.getKryo().getRegistration(Path.class).getId() > 0);

		// check if the generic type from one field is also registered (its very likely that
		// generic types are also used as fields somewhere.
		assertTrue(kryo.getKryo().getRegistration(FromGeneric1.class).getId() > 0);
		assertTrue(kryo.getKryo().getRegistration(FromGeneric2.class).getId() > 0);
		assertTrue(kryo.getKryo().getRegistration(Node.class).getId() > 0);
	}
}