/*
 * Copyright 2002-2022 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.test.web.servlet.samples.client.standalone;

import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;

import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.test.web.reactive.server.WebTestClient;
import org.springframework.test.web.servlet.client.MockMvcWebTestClient;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RestControllerAdvice;

/**
 * {@link MockMvcWebTestClient} equivalent of the MockMvc
 * {@link org.springframework.test.web.servlet.samples.standalone.ExceptionHandlerTests}.
 *
 * @author Rossen Stoyanchev
 */
class ExceptionHandlerTests {

	@Nested
	class MvcTests {

		@Test
		void localExceptionHandlerMethod() {
			WebTestClient client = MockMvcWebTestClient.bindToController(new PersonController()).build();

			client.get().uri("/person/Clyde")
					.exchange()
					.expectStatus().isOk()
					.expectHeader().valueEquals("Forwarded-Url", "errorView");
		}

		@Test
		void globalExceptionHandlerMethod() {
			WebTestClient client = MockMvcWebTestClient.bindToController(new PersonController())
					.controllerAdvice(new GlobalExceptionHandler())
					.build();

			client.get().uri("/person/Bonnie")
					.exchange()
					.expectStatus().isOk()
					.expectHeader().valueEquals("Forwarded-Url", "globalErrorView");
		}
	}


	@Controller
	private static class PersonController {

		@GetMapping("/person/{name}")
		String show(@PathVariable String name) {
			if (name.equals("Clyde")) {
				throw new IllegalArgumentException("simulated exception");
			}
			else if (name.equals("Bonnie")) {
				throw new IllegalStateException("simulated exception");
			}
			return "person/show";
		}

		@ExceptionHandler
		String handleException(IllegalArgumentException exception) {
			return "errorView";
		}
	}

	@ControllerAdvice
	private static class GlobalExceptionHandler {

		@ExceptionHandler
		String handleException(IllegalStateException exception) {
			return "globalErrorView";
		}
	}


	@Nested
	class RestTests {

		@Test
		void noException() {
			WebTestClient client = MockMvcWebTestClient.bindToController(new RestPersonController())
					.controllerAdvice(new RestPersonControllerExceptionHandler())
					.build();

			client.get().uri("/person/Yoda")
					.accept(MediaType.APPLICATION_JSON)
					.exchange()
					.expectStatus().isOk()
					.expectBody().jsonPath("$.name", "Yoda");
		}

		@Test
		void localExceptionHandlerMethod() {
			WebTestClient client = MockMvcWebTestClient.bindToController(new RestPersonController())
					.controllerAdvice(new RestPersonControllerExceptionHandler())
					.build();

			client.get().uri("/person/Luke")
					.accept(MediaType.APPLICATION_JSON)
					.exchange()
					.expectStatus().isOk()
					.expectBody().jsonPath("$.error", "local - IllegalArgumentException");
		}

		@Test
		void globalExceptionHandlerMethod() {
			WebTestClient client = MockMvcWebTestClient.bindToController(new RestPersonController())
					.controllerAdvice(new RestGlobalExceptionHandler())
					.build();

			client.get().uri("/person/Leia")
					.accept(MediaType.APPLICATION_JSON)
					.exchange()
					.expectStatus().isOk()
					.expectBody().jsonPath("$.error", "global - IllegalArgumentException");
		}

		@Test
		void globalRestPersonControllerExceptionHandlerTakesPrecedenceOverGlobalExceptionHandler() {
			WebTestClient client = MockMvcWebTestClient.bindToController(new RestPersonController())
					.controllerAdvice(RestGlobalExceptionHandler.class, RestPersonControllerExceptionHandler.class)
					.build();

			client.get().uri("/person/Leia")
					.accept(MediaType.APPLICATION_JSON)
					.exchange()
					.expectStatus().isOk()
					.expectBody().jsonPath("$.error", "globalPersonController - IllegalStateException");
		}

		@Test
		void noHandlerFound() {
			WebTestClient client = MockMvcWebTestClient.bindToController(new RestPersonController())
					.controllerAdvice(RestGlobalExceptionHandler.class, RestPersonControllerExceptionHandler.class)
					.dispatcherServletCustomizer(servlet -> servlet.setThrowExceptionIfNoHandlerFound(true))
					.build();

			client.get().uri("/bogus")
					.accept(MediaType.APPLICATION_JSON)
					.exchange()
					.expectStatus().isOk()
					.expectBody().jsonPath("$.error", "global - NoHandlerFoundException");
		}
	}


	@RestController
	private static class RestPersonController {

		@GetMapping("/person/{name}")
		Person get(@PathVariable String name) {
			return switch (name) {
				case "Luke" -> throw new IllegalArgumentException();
				case "Leia" -> throw new IllegalStateException();
				default -> new Person("Yoda");
			};
		}

		@ExceptionHandler
		Error handleException(IllegalArgumentException exception) {
			return new Error("local - " + exception.getClass().getSimpleName());
		}
	}

	@RestControllerAdvice(assignableTypes = RestPersonController.class)
	@Order(Ordered.HIGHEST_PRECEDENCE)
	private static class RestPersonControllerExceptionHandler {

		@ExceptionHandler
		Error handleException(Throwable exception) {
			return new Error("globalPersonController - " + exception.getClass().getSimpleName());
		}
	}

	@RestControllerAdvice
	@Order(Ordered.LOWEST_PRECEDENCE)
	private static class RestGlobalExceptionHandler {

		@ExceptionHandler
		Error handleException(Throwable exception) {
			return new Error( "global - " + exception.getClass().getSimpleName());
		}
	}

	static class Person {

		private final String name;

		Person(String name) {
			this.name = name;
		}

		public String getName() {
			return name;
		}
	}

	static class Error {

		private final String error;

		Error(String error) {
			this.error = error;
		}

		public String getError() {
			return error;
		}
	}

}
