/*
 * Copyright 2012-present 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.boot.security.reactive;

import java.util.function.Supplier;

import org.junit.jupiter.api.Test;
import reactor.core.publisher.Mono;

import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.StaticApplicationContext;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
import org.springframework.mock.http.server.reactive.MockServerHttpResponse;
import org.springframework.mock.web.server.MockServerWebExchange;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebHandler;
import org.springframework.web.server.adapter.HttpWebHandlerAdapter;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
import static org.mockito.Mockito.mock;

/**
 * Tests for {@link ApplicationContextServerWebExchangeMatcher}.
 *
 * @author Madhura Bhave
 */
class ApplicationContextServerWebExchangeMatcherTests {

	@Test
	void createWhenContextClassIsNullShouldThrowException() {
		assertThatIllegalArgumentException()
			.isThrownBy(() -> new TestApplicationContextServerWebExchangeMatcher<>(null))
			.withMessageContaining("Context class must not be null");
	}

	@Test
	void matchesWhenContextClassIsApplicationContextShouldProvideContext() {
		ServerWebExchange exchange = createExchange();
		StaticApplicationContext context = (StaticApplicationContext) exchange.getApplicationContext();
		assertThat(new TestApplicationContextServerWebExchangeMatcher<>(ApplicationContext.class)
			.callMatchesAndReturnProvidedContext(exchange)
			.get()).isEqualTo(context);
	}

	@Test
	void matchesWhenContextClassIsExistingBeanShouldProvideBean() {
		ServerWebExchange exchange = createExchange();
		StaticApplicationContext context = (StaticApplicationContext) exchange.getApplicationContext();
		context.registerSingleton("existingBean", ExistingBean.class);
		assertThat(new TestApplicationContextServerWebExchangeMatcher<>(ExistingBean.class)
			.callMatchesAndReturnProvidedContext(exchange)
			.get()).isEqualTo(context.getBean(ExistingBean.class));
	}

	@Test
	void matchesWhenContextClassIsMissingBeanShouldProvideException() {
		ServerWebExchange exchange = createExchange();
		Supplier<ExistingBean> supplier = new TestApplicationContextServerWebExchangeMatcher<>(ExistingBean.class)
			.callMatchesAndReturnProvidedContext(exchange);
		assertThatExceptionOfType(NoSuchBeanDefinitionException.class).isThrownBy(supplier::get);
	}

	@Test
	void matchesWhenContextIsNull() {
		MockServerWebExchange exchange = MockServerWebExchange.from(MockServerHttpRequest.get("/path").build());
		assertThatIllegalStateException()
			.isThrownBy(() -> new TestApplicationContextServerWebExchangeMatcher<>(ExistingBean.class)
				.callMatchesAndReturnProvidedContext(exchange))
			.withMessageContaining("No ApplicationContext found on ServerWebExchange.");
	}

	private ServerWebExchange createExchange() {
		StaticApplicationContext context = new StaticApplicationContext();
		TestHttpWebHandlerAdapter adapter = new TestHttpWebHandlerAdapter(mock(WebHandler.class));
		adapter.setApplicationContext(context);
		return adapter.createExchange(MockServerHttpRequest.get("/path").build(), new MockServerHttpResponse());
	}

	static class TestHttpWebHandlerAdapter extends HttpWebHandlerAdapter {

		TestHttpWebHandlerAdapter(WebHandler delegate) {
			super(delegate);
		}

		@Override
		protected ServerWebExchange createExchange(ServerHttpRequest request, ServerHttpResponse response) {
			return super.createExchange(request, response);
		}

	}

	static class ExistingBean {

	}

	static class NewBean {

		private final ExistingBean bean;

		NewBean(ExistingBean bean) {
			this.bean = bean;
		}

		ExistingBean getBean() {
			return this.bean;
		}

	}

	static class TestApplicationContextServerWebExchangeMatcher<C>
			extends ApplicationContextServerWebExchangeMatcher<C> {

		private Supplier<C> providedContext;

		TestApplicationContextServerWebExchangeMatcher(Class<? extends C> context) {
			super(context);
		}

		Supplier<C> callMatchesAndReturnProvidedContext(ServerWebExchange exchange) {
			matches(exchange);
			return getProvidedContext();
		}

		@Override
		protected Mono<MatchResult> matches(ServerWebExchange exchange, Supplier<C> context) {
			this.providedContext = context;
			return MatchResult.match();
		}

		Supplier<C> getProvidedContext() {
			return this.providedContext;
		}

	}

}
