/*
 * 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.web.server.context;

import java.io.File;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;

import org.springframework.boot.web.server.WebServer;
import org.springframework.util.StringUtils;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.contentOf;
import static org.mockito.BDDMockito.given;
import static org.mockito.Mockito.mock;

/**
 * Tests {@link WebServerPortFileWriter}.
 *
 * @author David Liu
 * @author Phillip Webb
 * @author Andy Wilkinson
 */
class WebServerPortFileWriterTests {

	@TempDir
	@SuppressWarnings("NullAway.Init")
	File tempDir;

	@BeforeEach
	@AfterEach
	void reset() {
		System.clearProperty("PORTFILE");
	}

	@Test
	void createPortFile() {
		File file = new File(this.tempDir, "port.file");
		WebServerPortFileWriter listener = new WebServerPortFileWriter(file);
		listener.onApplicationEvent(mockEvent("", 8080));
		assertThat(contentOf(file)).isEqualTo("8080");
	}

	@Test
	void overridePortFileWithDefault() {
		System.setProperty("PORTFILE", new File(this.tempDir, "port.file").getAbsolutePath());
		WebServerPortFileWriter listener = new WebServerPortFileWriter();
		listener.onApplicationEvent(mockEvent("", 8080));
		String content = contentOf(new File(System.getProperty("PORTFILE")));
		assertThat(content).isEqualTo("8080");
	}

	@Test
	void overridePortFileWithExplicitFile() {
		File file = new File(this.tempDir, "port.file");
		System.setProperty("PORTFILE", new File(this.tempDir, "override.file").getAbsolutePath());
		WebServerPortFileWriter listener = new WebServerPortFileWriter(file);
		listener.onApplicationEvent(mockEvent("", 8080));
		String content = contentOf(new File(System.getProperty("PORTFILE")));
		assertThat(content).isEqualTo("8080");
	}

	@Test
	void createManagementPortFile() {
		File file = new File(this.tempDir, "port.file");
		WebServerPortFileWriter listener = new WebServerPortFileWriter(file);
		listener.onApplicationEvent(mockEvent("", 8080));
		listener.onApplicationEvent(mockEvent("management", 9090));
		assertThat(contentOf(file)).isEqualTo("8080");
		String managementFile = file.getName();
		String extension = StringUtils.getFilenameExtension(managementFile);
		assertThat(extension).isNotNull();
		managementFile = managementFile.substring(0, managementFile.length() - extension.length() - 1);
		managementFile = managementFile + "-management." + StringUtils.getFilenameExtension(file.getName());
		String content = contentOf(new File(file.getParentFile(), managementFile));
		assertThat(content).isEqualTo("9090");
		assertThat(collectFileNames(file.getParentFile())).contains(managementFile);
	}

	@Test
	void createUpperCaseManagementPortFile() {
		File file = new File(this.tempDir, "port.file");
		file = new File(file.getParentFile(), file.getName().toUpperCase(Locale.ENGLISH));
		WebServerPortFileWriter listener = new WebServerPortFileWriter(file);
		listener.onApplicationEvent(mockEvent("management", 9090));
		String managementFile = file.getName();
		String extension = StringUtils.getFilenameExtension(managementFile);
		assertThat(extension).isNotNull();
		managementFile = managementFile.substring(0, managementFile.length() - extension.length() - 1);
		managementFile = managementFile + "-MANAGEMENT." + StringUtils.getFilenameExtension(file.getName());
		String content = contentOf(new File(file.getParentFile(), managementFile));
		assertThat(content).isEqualTo("9090");
		assertThat(collectFileNames(file.getParentFile())).contains(managementFile);
	}

	@Test
	void getPortFileWhenPortFileNameDoesNotHaveExtension() {
		File file = new File(this.tempDir, "portfile");
		WebServerPortFileWriter listener = new WebServerPortFileWriter(file);
		WebServerApplicationContext applicationContext = mock(WebServerApplicationContext.class);
		given(applicationContext.getServerNamespace()).willReturn("management");
		assertThat(listener.getPortFile(applicationContext).getName()).isEqualTo("portfile-management");
	}

	private WebServerInitializedEvent mockEvent(String namespace, int port) {
		WebServer webServer = mock(WebServer.class);
		given(webServer.getPort()).willReturn(port);
		WebServerApplicationContext applicationContext = mock(WebServerApplicationContext.class);
		given(applicationContext.getServerNamespace()).willReturn(namespace);
		given(applicationContext.getWebServer()).willReturn(webServer);
		WebServerInitializedEvent event = mock(WebServerInitializedEvent.class);
		given(event.getApplicationContext()).willReturn(applicationContext);
		given(event.getWebServer()).willReturn(webServer);
		return event;
	}

	private Set<String> collectFileNames(File directory) {
		Set<String> names = new HashSet<>();
		if (directory.isDirectory()) {
			for (File file : directory.listFiles()) {
				names.add(file.getName());
			}
		}
		return names;
	}

}
