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/*

 * @test

 * @bug 8144355

 * @summary Test aliasing additions to ZipFileSystem for multi-release jar files

 * @library /lib/testlibrary/java/util/jar

 * @build Compiler JarBuilder CreateMultiReleaseTestJars

 * @run testng MultiReleaseJarTest

 */

import java.io.IOException;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodType;

import java.net.URI;

import java.nio.file.*;

import java.util.HashMap;

import java.util.Map;

import org.testng.Assert;

import org.testng.annotations.*;

public class MultiReleaseJarTest {

    final private String userdir = System.getProperty("user.dir",".");

    final private Map<String,String> stringEnv = new HashMap<>();

    final private Map<String,Integer> integerEnv = new HashMap<>();

    final private String className = "version.Version";

    final private MethodType mt = MethodType.methodType(int.class);

    private String entryName;

    private URI uvuri;

    private URI mruri;

    private URI smruri;

    @BeforeClass

    public void initialize() throws Exception {

        CreateMultiReleaseTestJars creator =  new CreateMultiReleaseTestJars();

        creator.compileEntries();

        creator.buildUnversionedJar();

        creator.buildMultiReleaseJar();

        creator.buildShortMultiReleaseJar();

        String ssp = Paths.get(userdir, "unversioned.jar").toUri().toString();

        uvuri = new URI("jar", ssp , null);

        ssp = Paths.get(userdir, "multi-release.jar").toUri().toString();

        mruri = new URI("jar", ssp, null);

        ssp = Paths.get(userdir, "short-multi-release.jar").toUri().toString();

        smruri = new URI("jar", ssp, null);

        entryName = className.replace('.', '/') + ".class";

    }

    public void close() throws IOException {

        Files.delete(Paths.get(userdir, "unversioned.jar"));

        Files.delete(Paths.get(userdir, "multi-release.jar"));

        Files.delete(Paths.get(userdir, "short-multi-release.jar"));

    }

    @DataProvider(name="strings")

    public Object[][] createStrings() {

        return new Object[][]{

                {"-20", 8},

                {"0", 8},

                {"8", 8},

                {"9", 9},

                {"10", 10},

                {"11", 10},

                {"50", 10}

        };

    }

    @DataProvider(name="integers")

    public Object[][] createIntegers() {

        return new Object[][] {

                {new Integer(-5), 8},

                {new Integer(0), 8},

                {new Integer(8), 8},

                {new Integer(9), 9},

                {new Integer(10), 10},

                {new Integer(11), 10},

                {new Integer(100), 10}

        };

    }

    // Not the best test but all I can do since ZipFileSystem and JarFileSystem

    // are not public, so I can't use (fs instanceof ...)

    @Test

    public void testNewFileSystem() throws Exception {

        Map<String,String> env = new HashMap<>();

        // no configuration, treat multi-release jar as unversioned

        try (FileSystem fs = FileSystems.newFileSystem(mruri, env)) {

            Assert.assertTrue(readAndCompare(fs, 8));

        }

        env.put("multi-release", "runtime");

        // a configuration and jar file is multi-release

        try (FileSystem fs = FileSystems.newFileSystem(mruri, env)) {

        }

        // a configuration but jar file is unversioned

        try (FileSystem fs = FileSystems.newFileSystem(uvuri, env)) {

            Assert.assertTrue(readAndCompare(fs, 8));

        }

    }

    private boolean readAndCompare(FileSystem fs, int expected) throws IOException {

        Path path = fs.getPath("version/Version.java");

        String src = new String(Files.readAllBytes(path));

        return src.contains("return " + expected);

    }

    @Test(dataProvider="strings")

    public void testStrings(String value, int expected) throws Throwable {

        stringEnv.put("multi-release", value);

        runTest(stringEnv, expected);

    }

    @Test(dataProvider="integers")

    public void testIntegers(Integer value, int expected) throws Throwable {

        integerEnv.put("multi-release", value);

        runTest(integerEnv, expected);

    }

    @Test

    public void testShortJar() throws Throwable {

        integerEnv.put("multi-release", Integer.valueOf(10));

        runTest(smruri, integerEnv, 10);

        integerEnv.put("multi-release", Integer.valueOf(9));

        runTest(smruri, integerEnv, 8);

    }

    private void runTest(Map<String,?> env, int expected) throws Throwable {

        runTest(mruri, env, expected);

    }

    private void runTest(URI uri, Map<String,?> env, int expected) throws Throwable {

        try (FileSystem fs = FileSystems.newFileSystem(uri, env)) {

            Path version = fs.getPath(entryName);

            byte [] bytes = Files.readAllBytes(version);

            Class<?> vcls = (new ByteArrayClassLoader(fs)).defineClass(className, bytes);

            MethodHandle mh = MethodHandles.lookup().findVirtual(vcls, "getVersion", mt);

            Assert.assertEquals((int)mh.invoke(vcls.newInstance()), expected);

        }

    }

    private static class ByteArrayClassLoader extends ClassLoader {

        final private FileSystem fs;

        ByteArrayClassLoader(FileSystem fs) {

            super(null);

            this.fs = fs;

        }

        @Override

        public Class<?> loadClass(String name) throws ClassNotFoundException {

            try {

                return super.loadClass(name);

            } catch (ClassNotFoundException x) {}

            Path cls = fs.getPath(name.replace('.', '/') + ".class");

            try {

                byte[] bytes = Files.readAllBytes(cls);

                return defineClass(name, bytes);

            } catch (IOException x) {

                throw new ClassNotFoundException(x.getMessage());

            }

        }

        public Class<?> defineClass(String name, byte[] bytes) throws ClassNotFoundException {

            if (bytes == null) throw new ClassNotFoundException("No bytes for " + name);

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

        }

    }

}