/*
 * 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
 *
 *      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.web.reactive.function.client;

import java.net.URI;

import org.junit.Test;
import reactor.core.publisher.Mono;
import reactor.test.StepVerifier;

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;

import static org.junit.Assert.*;
import static org.mockito.Mockito.*;
import static org.springframework.http.HttpMethod.GET;
import static org.springframework.web.reactive.function.client.ExchangeFilterFunctions.Credentials.basicAuthenticationCredentials;

/**
 * @author Arjen Poutsma
 */
public class ExchangeFilterFunctionsTests {

	@Test
	public void andThen() throws Exception {
		ClientRequest request = ClientRequest.method(GET, URI.create("http://example.com")).build();
		ClientResponse response = mock(ClientResponse.class);
		ExchangeFunction exchange = r -> Mono.just(response);

		boolean[] filtersInvoked = new boolean[2];
		ExchangeFilterFunction filter1 = (r, n) -> {
			assertFalse(filtersInvoked[0]);
			assertFalse(filtersInvoked[1]);
			filtersInvoked[0] = true;
			assertFalse(filtersInvoked[1]);
			return n.exchange(r);
		};
		ExchangeFilterFunction filter2 = (r, n) -> {
			assertTrue(filtersInvoked[0]);
			assertFalse(filtersInvoked[1]);
			filtersInvoked[1] = true;
			return n.exchange(r);
		};
		ExchangeFilterFunction filter = filter1.andThen(filter2);


		ClientResponse result = filter.filter(request, exchange).block();
		assertEquals(response, result);

		assertTrue(filtersInvoked[0]);
		assertTrue(filtersInvoked[1]);
	}

	@Test
	public void apply() throws Exception {
		ClientRequest request = ClientRequest.method(GET, URI.create("http://example.com")).build();
		ClientResponse response = mock(ClientResponse.class);
		ExchangeFunction exchange = r -> Mono.just(response);

		boolean[] filterInvoked = new boolean[1];
		ExchangeFilterFunction filter = (r, n) -> {
			assertFalse(filterInvoked[0]);
			filterInvoked[0] = true;
			return n.exchange(r);
		};

		ExchangeFunction filteredExchange = filter.apply(exchange);
		ClientResponse result = filteredExchange.exchange(request).block();
		assertEquals(response, result);
		assertTrue(filterInvoked[0]);
	}

	@Test
	public void basicAuthenticationUsernamePassword() throws Exception {
		ClientRequest request = ClientRequest.method(GET, URI.create("http://example.com")).build();
		ClientResponse response = mock(ClientResponse.class);

		ExchangeFunction exchange = r -> {
			assertTrue(r.headers().containsKey(HttpHeaders.AUTHORIZATION));
			assertTrue(r.headers().getFirst(HttpHeaders.AUTHORIZATION).startsWith("Basic "));
			return Mono.just(response);
		};

		ExchangeFilterFunction auth = ExchangeFilterFunctions.basicAuthentication("foo", "bar");
		assertFalse(request.headers().containsKey(HttpHeaders.AUTHORIZATION));
		ClientResponse result = auth.filter(request, exchange).block();
		assertEquals(response, result);
	}

	@Test(expected = IllegalArgumentException.class)
	public void basicAuthenticationInvalidCharacters() throws Exception {

		ExchangeFilterFunctions.basicAuthentication("foo", "\ud83d\udca9");
	}

	@Test
	public void basicAuthenticationAttributes() throws Exception {
		ClientRequest request = ClientRequest.method(GET, URI.create("http://example.com"))
				.attributes(basicAuthenticationCredentials("foo", "bar"))
				.build();
		ClientResponse response = mock(ClientResponse.class);

		ExchangeFunction exchange = r -> {
			assertTrue(r.headers().containsKey(HttpHeaders.AUTHORIZATION));
			assertTrue(r.headers().getFirst(HttpHeaders.AUTHORIZATION).startsWith("Basic "));
			return Mono.just(response);
		};

		ExchangeFilterFunction auth = ExchangeFilterFunctions.basicAuthentication();
		assertFalse(request.headers().containsKey(HttpHeaders.AUTHORIZATION));
		ClientResponse result = auth.filter(request, exchange).block();
		assertEquals(response, result);
	}

	@Test
	public void basicAuthenticationAbsentAttributes() throws Exception {
		ClientRequest request = ClientRequest.method(GET, URI.create("http://example.com")).build();
		ClientResponse response = mock(ClientResponse.class);

		ExchangeFunction exchange = r -> {
			assertFalse(r.headers().containsKey(HttpHeaders.AUTHORIZATION));
			return Mono.just(response);
		};

		ExchangeFilterFunction auth = ExchangeFilterFunctions.basicAuthentication();
		assertFalse(request.headers().containsKey(HttpHeaders.AUTHORIZATION));
		ClientResponse result = auth.filter(request, exchange).block();
		assertEquals(response, result);
	}

	@Test
	public void statusHandlerMatch() throws Exception {
		ClientRequest request = ClientRequest.method(GET, URI.create("http://example.com")).build();
		ClientResponse response = mock(ClientResponse.class);
		when(response.statusCode()).thenReturn(HttpStatus.NOT_FOUND);

		ExchangeFunction exchange = r -> Mono.just(response);

		ExchangeFilterFunction errorHandler = ExchangeFilterFunctions.statusError(
				HttpStatus::is4xxClientError, r -> new MyException());

		Mono<ClientResponse> result = errorHandler.filter(request, exchange);

		StepVerifier.create(result)
				.expectError(MyException.class)
				.verify();
	}

	@Test
	public void statusHandlerNoMatch() throws Exception {
		ClientRequest request = ClientRequest.method(GET, URI.create("http://example.com")).build();
		ClientResponse response = mock(ClientResponse.class);
		when(response.statusCode()).thenReturn(HttpStatus.NOT_FOUND);

		ExchangeFunction exchange = r -> Mono.just(response);

		ExchangeFilterFunction errorHandler = ExchangeFilterFunctions.statusError(
				HttpStatus::is5xxServerError, r -> new MyException());

		Mono<ClientResponse> result = errorHandler.filter(request, exchange);

		StepVerifier.create(result)
				.expectNext(response)
				.expectComplete()
				.verify();
	}

	@SuppressWarnings("serial")
	private static class MyException extends Exception {

	}

}
