/*
 * Copyright 2013-2019 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.cloud.aws.autoconfigure.context;

import java.lang.reflect.Field;

import com.sun.net.httpserver.HttpContext;
import com.sun.net.httpserver.HttpServer;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.springframework.boot.test.util.TestPropertyValues;
import org.springframework.cloud.aws.context.support.env.AwsCloudEnvironmentCheckUtils;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.util.ReflectionUtils;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * @author Agim Emruli
 */
class ContextInstanceDataAutoConfigurationTest {

	private AnnotationConfigApplicationContext context;

	@BeforeEach
	void restContextInstanceDataCondition() throws IllegalAccessException {
		Field field = ReflectionUtils.findField(AwsCloudEnvironmentCheckUtils.class,
				"isCloudEnvironment");
		assertThat(field).isNotNull();
		ReflectionUtils.makeAccessible(field);
		field.set(null, null);
	}

	@AfterEach
	void tearDown() throws Exception {
		if (this.context != null) {
			this.context.close();
		}
	}

	@Test
	void placeHolder_noExplicitConfiguration_createInstanceDataResolverForAwsEnvironment()
			throws Exception {
		// Arrange
		HttpServer httpServer = MetaDataServer.setupHttpServer();
		HttpContext instanceIdHttpContext = httpServer.createContext(
				"/latest/meta-data/instance-id",
				new MetaDataServer.HttpResponseWriterHandler("testInstanceId"));

		this.context = new AnnotationConfigApplicationContext();
		this.context.register(ContextInstanceDataAutoConfiguration.class);

		// Act
		this.context.refresh();

		// Assert
		assertThat(this.context
				.containsBean("AmazonEc2InstanceDataPropertySourcePostProcessor"))
						.isTrue();

		httpServer.removeContext(instanceIdHttpContext);
	}

	@Test
	void placeHolder_noExplicitConfiguration_missingInstanceDataResolverForNotAwsEnvironment()
			throws Exception {
		// Arrange
		HttpServer httpServer = MetaDataServer.setupHttpServer();
		HttpContext instanceIdHttpContext = httpServer.createContext(
				"/latest/meta-data/instance-id",
				new MetaDataServer.HttpResponseWriterHandler(null));

		this.context = new AnnotationConfigApplicationContext();
		this.context.register(ContextInstanceDataAutoConfiguration.class);

		// Act
		this.context.refresh();

		// Assert
		assertThat(this.context
				.containsBean("AmazonEc2InstanceDataPropertySourcePostProcessor"))
						.isFalse();

		httpServer.removeContext(instanceIdHttpContext);
	}

	@Test
	void placeHolder_noExplicitConfiguration_createInstanceDataResolverThatResolvesWithDefaultAttributes()
			throws Exception {
		// Arrange
		HttpServer httpServer = MetaDataServer.setupHttpServer();
		HttpContext instanceIdHttpContext = httpServer.createContext(
				"/latest/meta-data/instance-id",
				new MetaDataServer.HttpResponseWriterHandler("testInstanceId"));
		HttpContext userDataHttpContext = httpServer.createContext("/latest/user-data",
				new MetaDataServer.HttpResponseWriterHandler("a:b;c:d"));

		this.context = new AnnotationConfigApplicationContext();
		this.context.register(ContextInstanceDataAutoConfiguration.class);

		// Act
		this.context.refresh();

		// Assert
		assertThat(this.context.getEnvironment().getProperty("a")).isEqualTo("b");
		assertThat(this.context.getEnvironment().getProperty("c")).isEqualTo("d");

		httpServer.removeContext(instanceIdHttpContext);
		httpServer.removeContext(userDataHttpContext);
	}

	@Test
	void placeHolder_customValueSeparator_createInstanceDataResolverThatResolvesWithCustomValueSeparator()
			throws Exception {
		// Arrange
		HttpServer httpServer = MetaDataServer.setupHttpServer();
		HttpContext instanceIdHttpContext = httpServer.createContext(
				"/latest/meta-data/instance-id",
				new MetaDataServer.HttpResponseWriterHandler("testInstanceId"));
		HttpContext userDataHttpContext = httpServer.createContext("/latest/user-data",
				new MetaDataServer.HttpResponseWriterHandler("a=b;c=d"));

		this.context = new AnnotationConfigApplicationContext();

		TestPropertyValues.of("cloud.aws.instance.data.valueSeparator:=")
				.applyTo(this.context);

		this.context.register(ContextInstanceDataAutoConfiguration.class);

		// Act
		this.context.refresh();

		// Assert
		assertThat(this.context.getEnvironment().getProperty("a")).isEqualTo("b");
		assertThat(this.context.getEnvironment().getProperty("c")).isEqualTo("d");

		httpServer.removeContext(instanceIdHttpContext);
		httpServer.removeContext(userDataHttpContext);
	}

	@Test
	void placeHolder_customAttributeSeparator_createInstanceDataResolverThatResolvesWithCustomAttribute()
			throws Exception {
		// Arrange
		HttpServer httpServer = MetaDataServer.setupHttpServer();
		HttpContext instanceIdHttpContext = httpServer.createContext(
				"/latest/meta-data/instance-id",
				new MetaDataServer.HttpResponseWriterHandler("testInstanceId"));
		HttpContext userDataHttpContext = httpServer.createContext("/latest/user-data",
				new MetaDataServer.HttpResponseWriterHandler("a:b/c:d"));

		this.context = new AnnotationConfigApplicationContext();

		TestPropertyValues.of("cloud.aws.instance.data.attributeSeparator:/")
				.applyTo(this.context);

		this.context.register(ContextInstanceDataAutoConfiguration.class);

		// Act
		this.context.refresh();

		// Assert
		assertThat(this.context.getEnvironment().getProperty("a")).isEqualTo("b");
		assertThat(this.context.getEnvironment().getProperty("c")).isEqualTo("d");

		httpServer.removeContext(instanceIdHttpContext);
		httpServer.removeContext(userDataHttpContext);
	}

}