/*
 * Copyright 2012-2021 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.loader;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.ref.SoftReference;
import java.net.URL;
import java.net.URLClassLoader;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

import org.assertj.core.api.Condition;
import org.awaitility.Awaitility;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.jupiter.api.io.TempDir;

import org.springframework.boot.loader.archive.Archive;
import org.springframework.boot.loader.archive.ExplodedArchive;
import org.springframework.boot.loader.archive.JarFileArchive;
import org.springframework.boot.loader.jar.Handler;
import org.springframework.boot.loader.jar.JarFile;
import org.springframework.boot.testsupport.system.CapturedOutput;
import org.springframework.boot.testsupport.system.OutputCaptureExtension;
import org.springframework.core.io.FileSystemResource;
import org.springframework.test.util.ReflectionTestUtils;
import org.springframework.util.FileCopyUtils;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
import static org.hamcrest.Matchers.containsString;

/**
 * Tests for {@link PropertiesLauncher}.
 *
 * @author Dave Syer
 * @author Andy Wilkinson
 */
@ExtendWith(OutputCaptureExtension.class)
class PropertiesLauncherTests {

	@TempDir
	File tempDir;

	private PropertiesLauncher launcher;

	private ClassLoader contextClassLoader;

	private CapturedOutput output;

	@BeforeEach
	void setup(CapturedOutput capturedOutput) throws Exception {
		this.contextClassLoader = Thread.currentThread().getContextClassLoader();
		clearHandlerCache();
		System.setProperty("loader.home", new File("src/test/resources").getAbsolutePath());
		this.output = capturedOutput;
	}

	@AfterEach
	void close() throws Exception {
		Thread.currentThread().setContextClassLoader(this.contextClassLoader);
		System.clearProperty("loader.home");
		System.clearProperty("loader.path");
		System.clearProperty("loader.main");
		System.clearProperty("loader.config.name");
		System.clearProperty("loader.config.location");
		System.clearProperty("loader.system");
		System.clearProperty("loader.classLoader");
		clearHandlerCache();
		if (this.launcher != null) {
			this.launcher.close();
		}
	}

	@SuppressWarnings("unchecked")
	private void clearHandlerCache() throws Exception {
		Map<File, JarFile> rootFileCache = ((SoftReference<Map<File, JarFile>>) ReflectionTestUtils
				.getField(Handler.class, "rootFileCache")).get();
		if (rootFileCache != null) {
			for (JarFile rootJarFile : rootFileCache.values()) {
				rootJarFile.close();
			}
			rootFileCache.clear();
		}
	}

	@Test
	void testDefaultHome() {
		System.clearProperty("loader.home");
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getHomeDirectory()).isEqualTo(new File(System.getProperty("user.dir")));
	}

	@Test
	void testAlternateHome() throws Exception {
		System.setProperty("loader.home", "src/test/resources/home");
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getHomeDirectory()).isEqualTo(new File(System.getProperty("loader.home")));
		assertThat(this.launcher.getMainClass()).isEqualTo("demo.HomeApplication");
	}

	@Test
	void testNonExistentHome() {
		System.setProperty("loader.home", "src/test/resources/nonexistent");
		assertThatIllegalStateException().isThrownBy(PropertiesLauncher::new)
				.withMessageContaining("Invalid source directory").withCauseInstanceOf(IllegalArgumentException.class);
	}

	@Test
	void testUserSpecifiedMain() throws Exception {
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getMainClass()).isEqualTo("demo.Application");
		assertThat(System.getProperty("loader.main")).isNull();
	}

	@Test
	void testUserSpecifiedConfigName() throws Exception {
		System.setProperty("loader.config.name", "foo");
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getMainClass()).isEqualTo("my.Application");
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString()).isEqualTo("[etc/]");
	}

	@Test
	void testRootOfClasspathFirst() throws Exception {
		System.setProperty("loader.config.name", "bar");
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getMainClass()).isEqualTo("my.BarApplication");
	}

	@Test
	void testUserSpecifiedDotPath() {
		System.setProperty("loader.path", ".");
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString()).isEqualTo("[.]");
	}

	@Test
	void testUserSpecifiedSlashPath() throws Exception {
		System.setProperty("loader.path", "jars/");
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString()).isEqualTo("[jars/]");
		List<Archive> archives = new ArrayList<>();
		this.launcher.getClassPathArchivesIterator().forEachRemaining(archives::add);
		assertThat(archives).areExactly(1, endingWith("app.jar"));
	}

	@Test
	void testUserSpecifiedWildcardPath() throws Exception {
		System.setProperty("loader.path", "jars/*");
		System.setProperty("loader.main", "demo.Application");
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString()).isEqualTo("[jars/]");
		this.launcher.launch(new String[0]);
		waitFor("Hello World");
	}

	@Test
	void testUserSpecifiedJarPath() throws Exception {
		System.setProperty("loader.path", "jars/app.jar");
		System.setProperty("loader.main", "demo.Application");
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString()).isEqualTo("[jars/app.jar]");
		this.launcher.launch(new String[0]);
		waitFor("Hello World");
	}

	@Test
	void testUserSpecifiedRootOfJarPath() throws Exception {
		System.setProperty("loader.path", "jar:file:./src/test/resources/nested-jars/app.jar!/");
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString())
				.isEqualTo("[jar:file:./src/test/resources/nested-jars/app.jar!/]");
		List<Archive> archives = new ArrayList<>();
		this.launcher.getClassPathArchivesIterator().forEachRemaining(archives::add);
		assertThat(archives).areExactly(1, endingWith("foo.jar!/"));
		assertThat(archives).areExactly(1, endingWith("app.jar"));
	}

	@Test
	void testUserSpecifiedRootOfJarPathWithDot() throws Exception {
		System.setProperty("loader.path", "nested-jars/app.jar!/./");
		this.launcher = new PropertiesLauncher();
		List<Archive> archives = new ArrayList<>();
		this.launcher.getClassPathArchivesIterator().forEachRemaining(archives::add);
		assertThat(archives).areExactly(1, endingWith("foo.jar!/"));
		assertThat(archives).areExactly(1, endingWith("app.jar"));
	}

	@Test
	void testUserSpecifiedRootOfJarPathWithDotAndJarPrefix() throws Exception {
		System.setProperty("loader.path", "jar:file:./src/test/resources/nested-jars/app.jar!/./");
		this.launcher = new PropertiesLauncher();
		List<Archive> archives = new ArrayList<>();
		this.launcher.getClassPathArchivesIterator().forEachRemaining(archives::add);
		assertThat(archives).areExactly(1, endingWith("foo.jar!/"));
	}

	@Test
	void testUserSpecifiedJarFileWithNestedArchives() throws Exception {
		System.setProperty("loader.path", "nested-jars/app.jar");
		System.setProperty("loader.main", "demo.Application");
		this.launcher = new PropertiesLauncher();
		List<Archive> archives = new ArrayList<>();
		this.launcher.getClassPathArchivesIterator().forEachRemaining(archives::add);
		assertThat(archives).areExactly(1, endingWith("foo.jar!/"));
		assertThat(archives).areExactly(1, endingWith("app.jar"));
	}

	@Test
	void testUserSpecifiedNestedJarPath() throws Exception {
		System.setProperty("loader.path", "nested-jars/nested-jar-app.jar!/BOOT-INF/classes/");
		System.setProperty("loader.main", "demo.Application");
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString())
				.isEqualTo("[nested-jars/nested-jar-app.jar!/BOOT-INF/classes/]");
		this.launcher.launch(new String[0]);
		waitFor("Hello World");
	}

	@Test
	void testUserSpecifiedDirectoryContainingJarFileWithNestedArchives() throws Exception {
		System.setProperty("loader.path", "nested-jars");
		System.setProperty("loader.main", "demo.Application");
		this.launcher = new PropertiesLauncher();
		this.launcher.launch(new String[0]);
		waitFor("Hello World");
	}

	@Test
	void testUserSpecifiedJarPathWithDot() throws Exception {
		System.setProperty("loader.path", "./jars/app.jar");
		System.setProperty("loader.main", "demo.Application");
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString()).isEqualTo("[jars/app.jar]");
		this.launcher.launch(new String[0]);
		waitFor("Hello World");
	}

	@Test
	void testUserSpecifiedClassLoader() throws Exception {
		System.setProperty("loader.path", "jars/app.jar");
		System.setProperty("loader.classLoader", URLClassLoader.class.getName());
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString()).isEqualTo("[jars/app.jar]");
		this.launcher.launch(new String[0]);
		waitFor("Hello World");
	}

	@Test
	void testUserSpecifiedClassPathOrder() throws Exception {
		System.setProperty("loader.path", "more-jars/app.jar,jars/app.jar");
		System.setProperty("loader.classLoader", URLClassLoader.class.getName());
		this.launcher = new PropertiesLauncher();
		assertThat(ReflectionTestUtils.getField(this.launcher, "paths").toString())
				.isEqualTo("[more-jars/app.jar, jars/app.jar]");
		this.launcher.launch(new String[0]);
		waitFor("Hello Other World");
	}

	@Test
	void testCustomClassLoaderCreation() throws Exception {
		System.setProperty("loader.classLoader", TestLoader.class.getName());
		this.launcher = new PropertiesLauncher();
		ClassLoader loader = this.launcher.createClassLoader(archives());
		assertThat(loader).isNotNull();
		assertThat(loader.getClass().getName()).isEqualTo(TestLoader.class.getName());
	}

	private Iterator<Archive> archives() throws Exception {
		List<Archive> archives = new ArrayList<>();
		String path = System.getProperty("java.class.path");
		for (String url : path.split(File.pathSeparator)) {
			Archive archive = archive(url);
			if (archive != null) {
				archives.add(archive);
			}
		}
		return archives.iterator();
	}

	private Archive archive(String url) throws IOException {
		File file = new FileSystemResource(url).getFile();
		if (!file.exists()) {
			return null;
		}
		if (url.endsWith(".jar")) {
			return new JarFileArchive(file);
		}
		return new ExplodedArchive(file);
	}

	@Test
	void testUserSpecifiedConfigPathWins() throws Exception {
		System.setProperty("loader.config.name", "foo");
		System.setProperty("loader.config.location", "classpath:bar.properties");
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getMainClass()).isEqualTo("my.BarApplication");
	}

	@Test
	void testSystemPropertySpecifiedMain() throws Exception {
		System.setProperty("loader.main", "foo.Bar");
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getMainClass()).isEqualTo("foo.Bar");
	}

	@Test
	void testSystemPropertiesSet() {
		System.setProperty("loader.system", "true");
		new PropertiesLauncher();
		assertThat(System.getProperty("loader.main")).isEqualTo("demo.Application");
	}

	@Test
	void testArgsEnhanced() throws Exception {
		System.setProperty("loader.args", "foo");
		this.launcher = new PropertiesLauncher();
		assertThat(Arrays.asList(this.launcher.getArgs("bar")).toString()).isEqualTo("[foo, bar]");
	}

	@SuppressWarnings("unchecked")
	@Test
	void testLoadPathCustomizedUsingManifest() throws Exception {
		System.setProperty("loader.home", this.tempDir.getAbsolutePath());
		Manifest manifest = new Manifest();
		manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
		manifest.getMainAttributes().putValue("Loader-Path", "/foo.jar, /bar");
		File manifestFile = new File(this.tempDir, "META-INF/MANIFEST.MF");
		manifestFile.getParentFile().mkdirs();
		try (FileOutputStream manifestStream = new FileOutputStream(manifestFile)) {
			manifest.write(manifestStream);
		}
		this.launcher = new PropertiesLauncher();
		assertThat((List<String>) ReflectionTestUtils.getField(this.launcher, "paths")).containsExactly("/foo.jar",
				"/bar/");
	}

	@Test
	void testManifestWithPlaceholders() throws Exception {
		System.setProperty("loader.home", "src/test/resources/placeholders");
		this.launcher = new PropertiesLauncher();
		assertThat(this.launcher.getMainClass()).isEqualTo("demo.FooApplication");
	}

	@Test
	void encodedFileUrlLoaderPathIsHandledCorrectly() throws Exception {
		File loaderPath = new File(this.tempDir, "loader path");
		loaderPath.mkdir();
		System.setProperty("loader.path", loaderPath.toURI().toURL().toString());
		this.launcher = new PropertiesLauncher();
		List<Archive> archives = new ArrayList<>();
		this.launcher.getClassPathArchivesIterator().forEachRemaining(archives::add);
		assertThat(archives.size()).isEqualTo(1);
		File archiveRoot = (File) ReflectionTestUtils.getField(archives.get(0), "root");
		assertThat(archiveRoot).isEqualTo(loaderPath);
	}

	@Test // gh-21575
	void loadResourceFromJarFile() throws Exception {
		File jarFile = new File(this.tempDir, "app.jar");
		TestJarCreator.createTestJar(jarFile);
		System.setProperty("loader.home", this.tempDir.getAbsolutePath());
		System.setProperty("loader.path", "app.jar");
		this.launcher = new PropertiesLauncher();
		try {
			this.launcher.launch(new String[0]);
		}
		catch (Exception ex) {
			// Expected ClassNotFoundException
			LaunchedURLClassLoader classLoader = (LaunchedURLClassLoader) Thread.currentThread()
					.getContextClassLoader();
			classLoader.close();
		}
		URL resource = new URL("jar:" + jarFile.toURI() + "!/nested.jar!/3.dat");
		byte[] bytes = FileCopyUtils.copyToByteArray(resource.openStream());
		assertThat(bytes).isNotEmpty();
	}

	private void waitFor(String value) {
		Awaitility.waitAtMost(Duration.ofSeconds(5)).until(this.output::toString, containsString(value));
	}

	private Condition<Archive> endingWith(String value) {
		return new Condition<Archive>() {

			@Override
			public boolean matches(Archive archive) {
				return archive.toString().endsWith(value);
			}

		};
	}

	static class TestLoader extends URLClassLoader {

		TestLoader(ClassLoader parent) {
			super(new URL[0], parent);
		}

		@Override
		protected Class<?> findClass(String name) throws ClassNotFoundException {
			return super.findClass(name);
		}

	}

}
