/*
 * 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.test.context.assertj;

import java.util.function.Supplier;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.StaticApplicationContext;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
import static org.mockito.BDDMockito.then;

/**
 * Tests for {@link ApplicationContextAssertProvider} and
 * {@link AssertProviderApplicationContextInvocationHandler}.
 *
 * @author Phillip Webb
 */
@ExtendWith(MockitoExtension.class)
class ApplicationContextAssertProviderTests {

	@Mock
	private ConfigurableApplicationContext mockContext;

	private RuntimeException startupFailure;

	private Supplier<ApplicationContext> mockContextSupplier;

	private Supplier<ApplicationContext> startupFailureSupplier;

	@BeforeEach
	void setup() {
		this.startupFailure = new RuntimeException();
		this.mockContextSupplier = () -> this.mockContext;
		this.startupFailureSupplier = () -> {
			throw this.startupFailure;
		};
	}

	@Test
	void getWhenTypeIsNullShouldThrowException() {
		assertThatIllegalArgumentException().isThrownBy(
				() -> ApplicationContextAssertProvider.get(null, ApplicationContext.class, this.mockContextSupplier))
			.withMessageContaining("Type must not be null");
	}

	@Test
	void getWhenTypeIsClassShouldThrowException() {
		assertThatIllegalArgumentException().isThrownBy(
				() -> ApplicationContextAssertProvider.get(null, ApplicationContext.class, this.mockContextSupplier))
			.withMessageContaining("Type must not be null");
	}

	@Test
	void getWhenContextTypeIsNullShouldThrowException() {
		assertThatIllegalArgumentException()
			.isThrownBy(() -> ApplicationContextAssertProvider.get(TestAssertProviderApplicationContextClass.class,
					ApplicationContext.class, this.mockContextSupplier))
			.withMessageContaining("Type must be an interface");
	}

	@Test
	void getWhenContextTypeIsClassShouldThrowException() {
		assertThatIllegalArgumentException()
			.isThrownBy(() -> ApplicationContextAssertProvider.get(TestAssertProviderApplicationContext.class, null,
					this.mockContextSupplier))
			.withMessageContaining("ContextType must not be null");
	}

	@Test
	void getWhenSupplierIsNullShouldThrowException() {
		assertThatIllegalArgumentException()
			.isThrownBy(() -> ApplicationContextAssertProvider.get(TestAssertProviderApplicationContext.class,
					StaticApplicationContext.class, this.mockContextSupplier))
			.withMessageContaining("ContextType must be an interface");
	}

	@Test
	void getWhenContextStartsShouldReturnProxyThatCallsRealMethods() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.mockContextSupplier);
		assertThat((Object) context).isNotNull();
		context.getBean("foo");
		then(this.mockContext).should().getBean("foo");
	}

	@Test
	void getWhenContextFailsShouldReturnProxyThatThrowsExceptions() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.startupFailureSupplier);
		assertThat((Object) context).isNotNull();
		assertThatIllegalStateException().isThrownBy(() -> context.getBean("foo"))
			.withCause(this.startupFailure)
			.withMessageContaining("failed to start");
	}

	@Test
	void getSourceContextWhenContextStartsShouldReturnSourceContext() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.mockContextSupplier);
		assertThat(context.getSourceApplicationContext()).isSameAs(this.mockContext);
	}

	@Test
	void getSourceContextWhenContextFailsShouldThrowException() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.startupFailureSupplier);
		assertThatIllegalStateException().isThrownBy(context::getSourceApplicationContext)
			.withCause(this.startupFailure)
			.withMessageContaining("failed to start");
	}

	@Test
	void getSourceContextOfTypeWhenContextStartsShouldReturnSourceContext() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.mockContextSupplier);
		assertThat(context.getSourceApplicationContext(ApplicationContext.class)).isSameAs(this.mockContext);
	}

	@Test
	void getSourceContextOfTypeWhenContextFailsToStartShouldThrowException() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.startupFailureSupplier);
		assertThatIllegalStateException()
			.isThrownBy(() -> context.getSourceApplicationContext(ApplicationContext.class))
			.withCause(this.startupFailure)
			.withMessageContaining("failed to start");
	}

	@Test
	void getStartupFailureWhenContextStartsShouldReturnNull() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.mockContextSupplier);
		assertThat(context.getStartupFailure()).isNull();
	}

	@Test
	void getStartupFailureWhenContextFailsToStartShouldReturnException() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.startupFailureSupplier);
		assertThat(context.getStartupFailure()).isEqualTo(this.startupFailure);
	}

	@Test
	void assertThatWhenContextStartsShouldReturnAssertions() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.mockContextSupplier);
		ApplicationContextAssert<ApplicationContext> contextAssert = assertThat(context);
		assertThat(contextAssert.getApplicationContext()).isSameAs(context);
		assertThat(contextAssert.getStartupFailure()).isNull();
	}

	@Test
	void assertThatWhenContextFailsShouldReturnAssertions() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.startupFailureSupplier);
		ApplicationContextAssert<ApplicationContext> contextAssert = assertThat(context);
		assertThat(contextAssert.getApplicationContext()).isSameAs(context);
		assertThat(contextAssert.getStartupFailure()).isSameAs(this.startupFailure);
	}

	@Test
	void toStringWhenContextStartsShouldReturnSimpleString() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.mockContextSupplier);
		assertThat(context.toString()).startsWith("Started application [ConfigurableApplicationContext.MockitoMock")
			.endsWith("id = [null], applicationName = [null], beanDefinitionCount = 0]");
	}

	@Test
	void toStringWhenContextFailsToStartShouldReturnSimpleString() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.startupFailureSupplier);
		assertThat(context).hasToString("Unstarted application context "
				+ "org.springframework.context.ApplicationContext[startupFailure=java.lang.RuntimeException]");
	}

	@Test
	void closeShouldCloseContext() {
		ApplicationContextAssertProvider<ApplicationContext> context = get(this.mockContextSupplier);
		context.close();
		then(this.mockContext).should().close();
	}

	private ApplicationContextAssertProvider<ApplicationContext> get(Supplier<ApplicationContext> contextSupplier) {
		return ApplicationContextAssertProvider.get(TestAssertProviderApplicationContext.class,
				ApplicationContext.class, contextSupplier);
	}

	interface TestAssertProviderApplicationContext extends ApplicationContextAssertProvider<ApplicationContext> {

	}

	abstract static class TestAssertProviderApplicationContextClass implements TestAssertProviderApplicationContext {

	}

}
