package org.springframework.cloud.netflix.zuul;

import static org.junit.Assert.assertEquals;

import java.util.Arrays;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.test.IntegrationTest;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.boot.test.TestRestTemplate;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.cloud.netflix.zuul.filters.ProxyRouteLocator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.netflix.appinfo.EurekaInstanceConfig;
import com.netflix.loadbalancer.BaseLoadBalancer;
import com.netflix.loadbalancer.ILoadBalancer;
import com.netflix.loadbalancer.Server;
import com.netflix.zuul.ZuulFilter;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = RetryableZuulProxyApplication.class)
@WebAppConfiguration
@IntegrationTest({ "server.port: 0",
		"zuul.routes.simple.path: /simple/**",
		"zuul.routes.simple.retryable: true",
		"ribbon.OkToRetryOnAllOperations: true"
})
@DirtiesContext
public class RetryableZuulProxyApplicationTests {

		@Value("${local.server.port}")
		private int port;

		@Autowired
		private ProxyRouteLocator routes;

		@Autowired
		private RoutesEndpoint endpoint;

		@Test
		public void postWithForm() {
				MultiValueMap<String, String> form = new LinkedMultiValueMap<String, String>();
				form.set("foo", "bar");
				HttpHeaders headers = new HttpHeaders();
				headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
				ResponseEntity<String> result = new TestRestTemplate().exchange(
						"http://localhost:" + port + "/simple", HttpMethod.POST,
						new HttpEntity<MultiValueMap<String,String>>(form, headers), String.class);
				assertEquals(HttpStatus.OK, result.getStatusCode());
				assertEquals("Posted! {foo=[bar]}", result.getBody());
		}

}

//Don't use @SpringBootApplication because we don't want to component scan
@Configuration
@EnableAutoConfiguration
@RestController
@EnableZuulProxy
@RibbonClient(name = "simple", configuration = RetryableRibbonClientConfiguration.class)
class RetryableZuulProxyApplication {

		@RequestMapping(value = "/", method = RequestMethod.POST)
		public String delete(@RequestBody MultiValueMap<String, String> form) {
				return "Posted! " + form;
		}

		@Bean
		public ZuulFilter sampleFilter() {
				return new ZuulFilter() {
						@Override
						public String filterType() {
								return "pre";
						}

						@Override
						public boolean shouldFilter() {
								return true;
						}

						@Override
						public Object run() {
								return null;
						}

						@Override
						public int filterOrder() {
								return 0;
						}
				};
		}

		public static void main(String[] args) {
				SpringApplication.run(SampleZuulProxyApplication.class, args);
		}

}

//Load balancer with fixed server list for "simple" pointing to localhost
@Configuration
class RetryableRibbonClientConfiguration {
		@Bean
		public ILoadBalancer ribbonLoadBalancer(EurekaInstanceConfig instance) {
				BaseLoadBalancer balancer = new BaseLoadBalancer();
				balancer.setServersList(Arrays.asList(
						new Server("localhost", instance.getNonSecurePort()),
						new Server("failed-localhost", instance.getNonSecurePort())
				));
				return balancer;
		}
}