/*
 * Copyright 2020-2024 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
 *
 *      https://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.springframework.cloud.fn.filter;

import java.util.List;
import java.util.function.Function;
import java.util.stream.Stream;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.test.annotation.DirtiesContext;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * @author Artem Bilan
 * @author David Turanski
 */
@SpringBootTest(properties = "filter.function.expression=payload.length() > 5")
@DirtiesContext
public class FilterFunctionApplicationTests {

	@Autowired
	@Qualifier("filterFunction")
	Function<Message<?>, Message<?>> filter;

	@Test
	public void testFilter() {
		Stream<Message<?>> messages = Stream.of("hello", "hello world").map(GenericMessage::new);
		List<Message<?>> result = messages.filter((message) -> this.filter.apply(message) != null).toList();
		assertThat(result.size()).isEqualTo(1);
		assertThat(result.get(0).getPayload()).isNotNull();
		assertThat(result.get(0).getPayload()).isEqualTo("hello world");
	}

	@SpringBootApplication
	static class FilterFunctionTestApplication {

	}

}
