/*
 * Copyright 2020-2020 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.stream.function;

import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;

import org.junit.jupiter.api.Test;

import org.springframework.boot.WebApplicationType;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.stream.binder.test.InputDestination;
import org.springframework.cloud.stream.binder.test.OutputDestination;
import org.springframework.cloud.stream.binder.test.TestChannelBinderConfiguration;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.GenericMessage;

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

/**
 *
 * @author Oleg Zhurakousky
 *
 */
public class ScenarioTests {

	@Test
	public void test2106() {
		try (ConfigurableApplicationContext context = new SpringApplicationBuilder(TestChannelBinderConfiguration
				.getCompleteConfiguration(ConsumerConfiguration.class))
						.web(WebApplicationType.NONE).run(
								"--spring.cloud.function.definition=consume;echo",
								"--spring.cloud.stream.bindings.consume-in-0.destination=input",
								"--spring.cloud.stream.bindings.echo-in-0.destination=echoin",
								"--spring.cloud.stream.bindings.echo-out-0.destination=echoout",
								"--spring.jmx.enabled=false")) {

			ConsumerConfiguration configuration = context.getBean(ConsumerConfiguration.class);

			OutputDestination output = context.getBean(OutputDestination.class);

			StreamBridge bridge = context.getBean(StreamBridge.class);
			bridge.send("input", "destination");
			bridge.send("input", "destination");
			bridge.send("input", "destination");

			bridge.send("consume-in-0", "hello");
			bridge.send("consume-in-0", "hello");
			bridge.send("consume-in-0", "hello");

			bridge.send("echoin", "hello");
			bridge.send("echoin", "hello");
			bridge.send("echoin", "hello");

			assertThat(configuration.destinationCounter).isEqualTo(3);
			assertThat(configuration.bindingCounter).isEqualTo(3);

			assertThat(output.receive(1000, "echoout")).isNotNull();
			assertThat(output.receive(1000, "echoout")).isNotNull();
			assertThat(output.receive(1000, "echoout")).isNotNull();
			assertThat(output.receive(1000, "echoout")).isNull();
		}
	}

	@Test
	public void testComposingSupplierWuthTypelessMessageFunction() throws Exception {
		try (ConfigurableApplicationContext context = new SpringApplicationBuilder(
				TestChannelBinderConfiguration.getCompleteConfiguration(SupplierConfiguration.class))
						.web(WebApplicationType.NONE)
						.run("--spring.jmx.enabled=false",
								"--spring.cloud.function.definition=messageSupplier|messageFunction")) {

			OutputDestination output = context.getBean(OutputDestination.class);
			assertThat(output.receive(1000, "messageSuppliermessageFunction-out-0")).isNotNull();
			assertThat(output.receive(1200, "messageSuppliermessageFunction-out-0")).isNotNull();
			assertThat(output.receive(1300, "messageSuppliermessageFunction-out-0")).isNotNull();
		}
	}

	@Test
	public void test2107() {
		try (ConfigurableApplicationContext context = new SpringApplicationBuilder(
				TestChannelBinderConfiguration.getCompleteConfiguration(FunctionReturningNullConfiguration.class))
						.web(WebApplicationType.NONE)
						.run("--spring.jmx.enabled=false",
								"--spring.cloud.function.definition=uppercase")) {

			InputDestination input = context.getBean(InputDestination.class);
			input.send(new GenericMessage<byte[]>("a".getBytes()), "uppercase-in-0");
			OutputDestination output = context.getBean(OutputDestination.class);
			assertThat(new String(output.receive(2000, "uppercase-out-0").getPayload())).isEqualTo("a");
			input.send(new GenericMessage<byte[]>("b".getBytes()), "uppercase-in-0");
			assertThat(output.receive(2000, "uppercase-out-0")).isNull();
		}
	}

	@Test
	public void test2113() {
		try (ConfigurableApplicationContext context = new SpringApplicationBuilder(
				TestChannelBinderConfiguration.getCompleteConfiguration(TestConfiguration.class))
						.web(WebApplicationType.NONE)
						.run("--spring.jmx.enabled=false",
								"--spring.cloud.function.definition=genericTypeFunction")) {

			InputDestination input = context.getBean(InputDestination.class);
			OutputDestination output = context.getBean(OutputDestination.class);

			input.send(new GenericMessage<byte[]>("hello".getBytes()), "genericTypeFunction-in-0");
			assertThat(new String(output.receive(1000, "genericTypeFunction-out-0").getPayload())).isEqualTo("hello_hello");
		}
	}



	@EnableAutoConfiguration
	@Configuration
	public static class TestConfiguration {
		@SuppressWarnings("unchecked")
		@Bean
		public <I, O> Function<I, O> genericTypeFunction() {
			return v -> {
				return (O) ("hello_" + new String((byte[]) v));
			};
		}
	}

	@EnableAutoConfiguration
	@Configuration
	public static class SupplierConfiguration {
		@Bean
		public Supplier<Message<?>> messageSupplier() {
			return () -> new GenericMessage<>("10/27/20 07:20:01");
		}
		@Bean
		public Function<Message<?>, Message<?>> messageFunction() {
			return message -> {
				return message;
			};
		}

	}

	@EnableAutoConfiguration
	@Configuration
	public static class FunctionReturningNullConfiguration {
		@Bean
		public Function<String, String> uppercase() {
			return v -> {
				if ("a".equals(v)) {
					return v;
				}
				else {
					return null;
				}
			};
		}
	}

	@EnableAutoConfiguration
	public static class ConsumerConfiguration {

		private int destinationCounter;

		private int bindingCounter;

		@Bean
		public Consumer<String> consume() {
			return v -> {
				if (v.equals("destination")) {
					destinationCounter++;
				}
				else {
					bindingCounter++;
				}
			};
		}

		@Bean
		public Function<String, String> echo() {
			return v -> v;
		}
	}
}
