/*
 * Copyright 2013-2020 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.gateway.handler.predicate;

import java.util.function.Predicate;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.cloud.gateway.handler.RoutePredicateHandlerMapping;
import org.springframework.cloud.gateway.handler.predicate.HeaderRoutePredicateFactory.Config;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.cloud.gateway.test.BaseWebClientTests;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.test.annotation.DirtiesContext;

import static org.assertj.core.api.Assertions.assertThat;
import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;

@SpringBootTest(webEnvironment = RANDOM_PORT)
@DirtiesContext
public class HeaderRoutePredicateFactoryTests extends BaseWebClientTests {

	@Test
	public void headerRouteWorks() {
		testClient.get().uri("/get").header("Foo", "bar").exchange().expectStatus().isOk().expectHeader()
				.valueEquals(HANDLER_MAPPER_HEADER, RoutePredicateHandlerMapping.class.getSimpleName()).expectHeader()
				.valueEquals(ROUTE_ID_HEADER, "header_test");
	}

	@Test
	@SuppressWarnings("Duplicates")
	public void headerRouteIgnoredWhenHeaderMissing() {
		testClient.get().uri("/get")
				// no headers set. Test used to throw a null pointer exception.
				.exchange().expectStatus().isOk().expectHeader()
				.valueEquals(HANDLER_MAPPER_HEADER, RoutePredicateHandlerMapping.class.getSimpleName()).expectHeader()
				.valueEquals(ROUTE_ID_HEADER, "default_path_to_httpbin");
	}

	@Test
	public void headerExistsWorksWithDsl() {
		testClient.get().uri("/get").header("X-Foo", "bar").exchange().expectStatus().isOk().expectHeader()
				.valueEquals(HANDLER_MAPPER_HEADER, RoutePredicateHandlerMapping.class.getSimpleName()).expectHeader()
				.valueEquals(ROUTE_ID_HEADER, "header_exists_dsl");
	}

	@Test
	public void toStringFormat() {
		Config config = new Config();
		config.setHeader("myheader");
		config.setRegexp("myregexp");
		Predicate predicate = new HeaderRoutePredicateFactory().apply(config);
		assertThat(predicate.toString()).contains("Header: myheader regexp=myregexp");
	}

	@EnableAutoConfiguration
	@SpringBootConfiguration
	@Import(DefaultTestConfig.class)
	public static class TestConfig {

		@Value("${test.uri}")
		private String uri;

		@Bean
		RouteLocator queryRouteLocator(RouteLocatorBuilder builder) {
			return builder.routes()
					.route("header_exists_dsl", r -> r.header("X-Foo").filters(f -> f.prefixPath("/httpbin")).uri(uri))
					.build();
		}

	}

}
