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/*

 * @test

 * @bug 8156499

 * @summary Test image creation from Multi-Release JAR

 * @author Steve Drach

 * @modules java.base/jdk.internal.jimage

 *          java.base/jdk.internal.module

 * @run testng JLinkMultiReleaseJarTest

*/

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodType;

import java.lang.module.ModuleDescriptor;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.nio.file.StandardCopyOption;

import java.util.Arrays;

import java.util.Set;

import java.util.jar.JarFile;

import java.util.spi.ToolProvider;

import java.util.stream.Collectors;

import java.util.stream.Stream;

import jdk.internal.jimage.BasicImageReader;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import org.testng.Assert;

import org.testng.annotations.BeforeClass;

import org.testng.annotations.Test;

public class JLinkMultiReleaseJarTest {

    private static final ToolProvider JAR_TOOL = ToolProvider.findFirst("jar")

            .orElseThrow(() -> new RuntimeException("jar tool not found"));

    private static final ToolProvider JAVAC_TOOL = ToolProvider.findFirst("javac")

            .orElseThrow(() -> new RuntimeException("javac tool not found"));

    private static final ToolProvider JLINK_TOOL = ToolProvider.findFirst("jlink")

            .orElseThrow(() -> new RuntimeException("jlink tool not found"));

    private final Path userdir = Paths.get(System.getProperty("user.dir", "."));

    private final Path javahome = Paths.get(System.getProperty("java.home"));

    private final Path jmodsdir = javahome.resolve("jmods");

    private final String pathsep = System.getProperty("path.separator");

    private byte[] resource = (Runtime.version().major() + " resource file").getBytes();

    @BeforeClass

    public void initialize() throws IOException {

        Path srcdir = Paths.get(System.getProperty("test.src"));

        // create class files from source

        Path base = srcdir.resolve("base");

        Path basemods = userdir.resolve("basemods");

        javac(base, basemods, base.toString());

        Path rt = srcdir.resolve("rt");

        Path rtmods = userdir.resolve("rtmods");

        javac(rt, rtmods, rt.toString());

        // create resources in basemods and rtmods

        Path dest = basemods.resolve("m1").resolve("resource.txt");

        byte[] text = "base resource file".getBytes();

        ByteArrayInputStream is = new ByteArrayInputStream(text);

        Files.copy(is, dest);

        dest = rtmods.resolve("m1").resolve("resource.txt");

        is = new ByteArrayInputStream(resource);

        Files.copy(is, dest);

        // build multi-release jar file with different module-infos

        String[] args = {

                "-cf", "m1.jar",

                "-C", basemods.resolve("m1").toString(), ".",

                "--release ", String.valueOf(JarFile.runtimeVersion().major()),

                "-C", rtmods.resolve("m1").toString(), "."

        };

        JAR_TOOL.run(System.out, System.err, args);

        // now move the module-info that requires logging to temporary place

        Files.move(rtmods.resolve("m1").resolve("module-info.class"),

                userdir.resolve("module-info.class"));

        // and build another jar

        args[1] = "m1-no-logging.jar";

        JAR_TOOL.run(System.out, System.err, args);

        // replace the no logging module-info with the logging module-info

        Files.move(userdir.resolve("module-info.class"),

                basemods.resolve("m1").resolve("module-info.class"),

                StandardCopyOption.REPLACE_EXISTING);

        // and build another jar

        args[1] = "m1-logging.jar";

        JAR_TOOL.run(System.out, System.err, args);

    }

    private void javac(Path source, Path destination, String srcpath) throws IOException {

        String[] args = Stream.concat(

                Stream.of("-d", destination.toString(), "--module-source-path", srcpath),

                Files.walk(source)

                        .map(Path::toString)

                        .filter(s -> s.endsWith(".java"))

        ).toArray(String[]::new);

        int rc = JAVAC_TOOL.run(System.out, System.err, args);

        Assert.assertEquals(rc, 0);

    }

    @Test

    public void basicTest() throws Throwable {

        if (ignoreTest()) return;

        // use jlink to build image from multi-release jar

       jlink("m1.jar", "myimage");

        // validate image

        Path jimage = userdir.resolve("myimage").resolve("lib").resolve("modules");

        try (BasicImageReader reader = BasicImageReader.open(jimage)) {

            // do we have the right entry names?

            Set<String> names = Arrays.stream(reader.getEntryNames())

                    .filter(n -> n.startsWith("/m1"))

                    .collect(Collectors.toSet());

            Assert.assertEquals(names, Set.of(

                    "/m1/module-info.class",

                    "/m1/p/Main.class",

                    "/m1/p/Type.class",

                    "/m1/q/PublicClass.class",

                    "/m1/META-INF/MANIFEST.MF",

                    "/m1/resource.txt"));

            // do we have the right module-info.class?

            byte[] b = reader.getResource("/m1/module-info.class");

            Set<String> requires = ModuleDescriptor

                    .read(new ByteArrayInputStream(b))

                    .requires()

                    .stream()

                    .map(mdr -> mdr.name())

                    .filter(nm -> !nm.equals("java.base"))

                    .collect(Collectors.toSet());

            Assert.assertEquals(requires, Set.of("java.logging"));

            // do we have the right resource?

            b = reader.getResource("/m1/resource.txt");

            Assert.assertEquals(b, resource);

            // do we have the right class?

            b = reader.getResource("/m1/p/Main.class");

            Class<?> clazz = (new ByteArrayClassLoader()).loadClass("p.Main", b);

            MethodHandle getVersion = MethodHandles.lookup()

                    .findVirtual(clazz, "getVersion", MethodType.methodType(int.class));

            int version = (int) getVersion.invoke(clazz.getConstructor().newInstance());

            Assert.assertEquals(version, JarFile.runtimeVersion().major());

        }

    }

    @Test

    public void noLoggingTest() throws Throwable {

        if (ignoreTest()) return;

        jlink("m1-no-logging.jar", "no-logging-image");

        runImage("no-logging-image", false);

    }

    @Test

    public void loggingTest() throws Throwable {

        if (ignoreTest()) return;

        jlink("m1-logging.jar", "logging-image");

        runImage("logging-image", true);

    }

    // java.base.jmod must exist for this test to make sense

    private boolean ignoreTest() {

        if (Files.isRegularFile(jmodsdir.resolve("java.base.jmod"))) {

            return false;

        }

        System.err.println("Test skipped. NO jmods/java.base.jmod");

        return true;

    }

    private void jlink(String jar, String image) {

        String args = "--output " + image + " --add-modules m1 --module-path " +

                jar + pathsep + jmodsdir.toString();

        int exitCode = JLINK_TOOL.run(System.out, System.err, args.split(" +"));

        Assert.assertEquals(exitCode, 0);

    }

    public void runImage(String image, boolean expected) throws Throwable {

        Path java = Paths.get(image, "bin", "java");

        OutputAnalyzer oa = ProcessTools.executeProcess(java.toString(), "-m", "m1/p.Main");

        String sout = oa.getStdout();

        boolean actual = sout.contains("logging found");

        Assert.assertEquals(actual, expected);

        System.out.println(sout);

        System.err.println(oa.getStderr());

        Assert.assertEquals(oa.getExitValue(), 0);

    }

    private static class ByteArrayClassLoader extends ClassLoader {

        public Class<?> loadClass(String name, byte[] bytes) {

            return defineClass(name, bytes, 0, bytes.length);

        }

    }

}