/*
 * Copyright 2013-2017 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;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.trace.http.HttpTraceRepository;
import org.springframework.boot.actuate.trace.http.InMemoryHttpTraceRepository;
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.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.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

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

import static org.junit.Assert.assertEquals;
import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = FormZuulServletProxyApplication.class, webEnvironment = RANDOM_PORT,
		properties = {"zuul.routes[simplefzspat].path:/simplefzspat/**", "zuul.routes[simplefzspat].serviceId:simplefzspat"})
@DirtiesContext
public class FormZuulServletProxyApplicationTests {

	@Autowired
	private TestRestTemplate testRestTemplate;

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

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

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

	@Test
	public void postWithMultipartForm() {
		MultiValueMap<String, String> form = new LinkedMultiValueMap<>();
		form.set("foo", "bar");
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.MULTIPART_FORM_DATA);
		ResponseEntity<String> result = testRestTemplate.exchange("/zuul/simplefzspat/form",
				HttpMethod.POST, new HttpEntity<>(form, headers), String.class);
		assertEquals(HttpStatus.OK, result.getStatusCode());
		assertEquals("Posted! {foo=[bar]}", result.getBody());
	}

	@Test
	public void postWithMultipartFile() {
		MultiValueMap<String, Object> form = new LinkedMultiValueMap<>();
		HttpHeaders part = new HttpHeaders();
		part.setContentType(MediaType.TEXT_PLAIN);
		part.setContentDispositionFormData("file", "foo.txt");
		form.set("foo", new HttpEntity<>("bar".getBytes(), part));
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.MULTIPART_FORM_DATA);
		headers.set("Transfer-Encoding", "chunked");
		headers.setContentLength(-1);
		ResponseEntity<String> result = testRestTemplate.exchange("/zuul/simplefzspat/file",
				HttpMethod.POST, new HttpEntity<>(form, headers), String.class);
		assertEquals(HttpStatus.OK, result.getStatusCode());
		assertEquals("Posted! bar", result.getBody());
	}

	@Test
	public void postWithUTF8Form() {
		MultiValueMap<String, String> form = new LinkedMultiValueMap<>();
		form.set("foo", "bar");
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.valueOf(
				MediaType.APPLICATION_FORM_URLENCODED_VALUE + "; charset=UTF-8"));
		ResponseEntity<String> result = testRestTemplate.exchange("/zuul/simplefzspat/form",
				HttpMethod.POST, new HttpEntity<>(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
@RibbonClients(@RibbonClient(name = "simplefzspat", configuration = ServletFormRibbonClientConfiguration.class))
class FormZuulServletProxyApplication {

	private static final Log log = LogFactory.getLog(FormZuulServletProxyApplication.class);

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

	// TODO: Why does this not work if you add @RequestParam as above?
	@RequestMapping(value = "/file", method = RequestMethod.POST)
	public String file(@RequestParam(required = false) MultipartFile file)
			throws IOException {
		byte[] bytes = new byte[0];
		if (file != null) {
			if (file.getSize() > 1024) {
				bytes = new byte[1024];
				InputStream inputStream = file.getInputStream();
				inputStream.read(bytes);
				byte[] buffer = new byte[1024 * 1024 * 10];
				while (inputStream.read(buffer) >= 0) {
					log.info("Read more bytes");
				}
			}
			else {
				bytes = file.getBytes();
			}
		}
		return "Posted! " + new String(bytes);
	}

	@Bean
	public ZuulFilter sampleFilter() {
		return new ZuulFilter() {

			@Override
			public String filterType() {
				return PRE_TYPE;
			}

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

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

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

		};
	}

	@Bean
	public HttpTraceRepository traceRepository() {
		return new InMemoryHttpTraceRepository();
	}

}

// Load balancer with fixed server list for "simplefzspat" pointing to localhost
@Configuration
class ServletFormRibbonClientConfiguration {

	@LocalServerPort
	private int port;

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

}
