/*
 * Copyright 2002-2017 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.web.reactive.function.server;

import java.net.URI;
import java.util.List;

import org.junit.Test;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.RequestEntity;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

import static org.junit.Assert.*;
import static org.springframework.web.reactive.function.BodyExtractors.*;
import static org.springframework.web.reactive.function.BodyInserters.*;
import static org.springframework.web.reactive.function.server.RequestPredicates.*;
import static org.springframework.web.reactive.function.server.RouterFunctions.*;

/**
 * @author Arjen Poutsma
 */
public class PublisherHandlerFunctionIntegrationTests extends AbstractRouterFunctionIntegrationTests {

	private final RestTemplate restTemplate = new RestTemplate();


	@Override
	protected RouterFunction<?> routerFunction() {
		PersonHandler personHandler = new PersonHandler();
		return route(GET("/mono"), personHandler::mono)
				.and(route(POST("/mono"), personHandler::postMono))
				.and(route(GET("/flux"), personHandler::flux));
	}


	@Test
	public void mono() throws Exception {
		ResponseEntity<Person> result =
				restTemplate.getForEntity("http://localhost:" + port + "/mono", Person.class);

		assertEquals(HttpStatus.OK, result.getStatusCode());
		assertEquals("John", result.getBody().getName());
	}

	@Test
	public void flux() throws Exception {
		ParameterizedTypeReference<List<Person>> reference = new ParameterizedTypeReference<List<Person>>() {};
		ResponseEntity<List<Person>> result =
				restTemplate.exchange("http://localhost:" + port + "/flux", HttpMethod.GET, null, reference);

		assertEquals(HttpStatus.OK, result.getStatusCode());
		List<Person> body = result.getBody();
		assertEquals(2, body.size());
		assertEquals("John", body.get(0).getName());
		assertEquals("Jane", body.get(1).getName());
	}

	@Test
	public void postMono() {
		URI uri = URI.create("http://localhost:" + port + "/mono");
		Person person = new Person("Jack");
		RequestEntity<Person> requestEntity = RequestEntity.post(uri).body(person);
		ResponseEntity<Person> result = restTemplate.exchange(requestEntity, Person.class);

		assertEquals(HttpStatus.OK, result.getStatusCode());
		assertEquals("Jack", result.getBody().getName());
	}


	private static class PersonHandler {

		public Mono<ServerResponse> mono(ServerRequest request) {
			Person person = new Person("John");
			return ServerResponse.ok().body(fromPublisher(Mono.just(person), Person.class));
		}

		public Mono<ServerResponse> postMono(ServerRequest request) {
			Mono<Person> personMono = request.body(toMono(Person.class));
			return ServerResponse.ok().body(fromPublisher(personMono, Person.class));
		}

		public Mono<ServerResponse> flux(ServerRequest request) {
			Person person1 = new Person("John");
			Person person2 = new Person("Jane");
			return ServerResponse.ok().body(
					fromPublisher(Flux.just(person1, person2), Person.class));
		}
	}


	private static class Person {

		private String name;

		@SuppressWarnings("unused")
		public Person() {
		}

		public Person(String name) {
			this.name = name;
		}

		public String getName() {
			return name;
		}

		@SuppressWarnings("unused")
		public void setName(String name) {
			this.name = name;
		}

		@Override
		public boolean equals(Object o) {
			if (this == o) {
				return true;
			}
			if (o == null || getClass() != o.getClass()) {
				return false;
			}
			Person person = (Person) o;
			return !(this.name != null ? !this.name.equals(person.name) : person.name != null);
		}

		@Override
		public int hashCode() {
			return this.name != null ? this.name.hashCode() : 0;
		}

		@Override
		public String toString() {
			return "Person{" + "name='" + name + '\'' + '}';
		}
	}

}
