/*
 * Copyright 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
 *
 *      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.springframework.cloud.netflix.zuul.filters.route;

import java.util.concurrent.atomic.AtomicInteger;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.cloud.netflix.ribbon.RibbonClients;
import org.springframework.cloud.netflix.ribbon.StaticServerList;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.netflix.loadbalancer.Server;
import com.netflix.loadbalancer.ServerList;
import com.netflix.zuul.context.RequestContext;

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

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = RANDOM_PORT, properties = {
		"zuul.routes.lazyroute.service-id=lazy", "zuul.routes.lazyroute.path=/lazy/**",
		"zuul.ribbon.eager-load.enabled=false"})
@DirtiesContext
public class LazyLoadOfZuulConfigurationTests {

	@LocalServerPort
	protected int port;

	@Before
	public void setTestRequestContext() {
		RequestContext context = new RequestContext();
		RequestContext.testSetCurrentContext(context);
	}

	@After
	public void clear() {
		RequestContext.getCurrentContext().clear();
	}

	@Test
	public void testLazyLoading() {
		// Child context FooConfig should be lazily created..
		assertThat(Foo.getInstanceCount()).isEqualTo(0);

		String uri = String.format("http://localhost:%d/lazy/sample", this.port);

		ResponseEntity<String> result = new TestRestTemplate().getForEntity(uri,
				String.class);

		// the instance should be available now..
		assertThat(Foo.getInstanceCount()).isEqualTo(1);

		assertThat(result.getStatusCode()).isEqualTo(HttpStatus.OK);
		assertThat(result.getBody()).isEqualTo("sample");
	}

	@EnableAutoConfiguration
	@Configuration
	@EnableZuulProxy
	@RibbonClients(@RibbonClient(name = "lazy", configuration = FooConfig.class))
	static class TestConfig {

	}

	static class Foo {
		private static final AtomicInteger INSTANCE_COUNT = new AtomicInteger();

		public Foo() {
			INSTANCE_COUNT.incrementAndGet();
		}

		public static int getInstanceCount() {
			return INSTANCE_COUNT.get();
		}
	}

	static class FooConfig {

		@Bean
		public Foo foo() {
			return new Foo();
		}

		@LocalServerPort
		private int port;

		@Bean
		public ServerList<Server> ribbonServerList() {
			return new StaticServerList<>(new Server("localhost", this.port));
		}

	}

	@Configuration
	@RestController
	static class SampleWebConfig {

		@RequestMapping("/sample")
		public String sampleEndpoint() {
			return "sample";
		}

	}
}
