/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/*

 * @test

 * @summary Test StripDebugPlugin

 * @author Jean-Francois Denise

 * @library ../../lib

 * @build tests.*

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

 *          jdk.jlink/jdk.tools.jlink.internal

 *          jdk.jlink/jdk.tools.jlink.internal.plugins

 *          jdk.jlink/jdk.tools.jlink.plugin

 *          jdk.jlink/jdk.tools.jimage

 *          jdk.jlink/jdk.tools.jmod

 *          jdk.jdeps/com.sun.tools.classfile

 *          jdk.compiler

 * @run main StripDebugPluginTest

 */

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Iterator;

import java.util.List;

import java.util.stream.Stream;

import com.sun.tools.classfile.Attribute;

import com.sun.tools.classfile.ClassFile;

import com.sun.tools.classfile.Code_attribute;

import com.sun.tools.classfile.ConstantPoolException;

import com.sun.tools.classfile.Method;

import java.util.HashMap;

import java.util.Map;

import jdk.tools.jlink.internal.ResourcePoolManager;

import jdk.tools.jlink.internal.plugins.StripDebugPlugin;

import jdk.tools.jlink.plugin.ResourcePoolEntry;

import jdk.tools.jlink.plugin.ResourcePool;

import jdk.tools.jlink.plugin.Plugin;

import tests.Helper;

public class StripDebugPluginTest {

    public static void main(String[] args) throws Exception {

        new StripDebugPluginTest().test();

    }

    public void test() throws Exception {

        // JPRT not yet ready for jmods

        Helper helper = Helper.newHelper();

        if (helper == null) {

            System.err.println("Test not run, NO jmods directory");

            return;

        }

        List<String> classes = Arrays.asList("toto.Main", "toto.com.foo.bar.X");

        Path moduleFile = helper.generateModuleCompiledClasses(

                helper.getJmodSrcDir(), helper.getJmodClassesDir(), "leaf1", classes);

        Path moduleInfo = moduleFile.resolve("module-info.class");

        // Classes have been compiled in debug.

        List<Path> covered = new ArrayList<>();

        byte[] infoContent = Files.readAllBytes(moduleInfo);

        try (Stream<Path> stream = Files.walk(moduleFile)) {

            for (Iterator<Path> iterator = stream.iterator(); iterator.hasNext(); ) {

                Path p = iterator.next();

                if (Files.isRegularFile(p) && p.toString().endsWith(".class")) {

                    byte[] content = Files.readAllBytes(p);

                    String path = "/" + helper.getJmodClassesDir().relativize(p).toString();

                    String moduleInfoPath = path + "/module-info.class";

                    check(path, content, moduleInfoPath, infoContent);

                    covered.add(p);

                }

            }

        }

        if (covered.isEmpty()) {

            throw new AssertionError("No class to compress");

        } else {

            System.err.println("removed debug attributes from "

                    + covered.size() + " classes");

        }

    }

    private void check(String path, byte[] content, String infoPath, byte[] moduleInfo) throws Exception {

        path = path.replace('\\', '/');

        StripDebugPlugin debug = new StripDebugPlugin();

        debug.configure(new HashMap<>());

        ResourcePoolEntry result1 = stripDebug(debug, ResourcePoolEntry.create(path,content), path, infoPath, moduleInfo);

        if (!path.endsWith("module-info.class")) {

            if (result1.contentLength() >= content.length) {

                throw new AssertionError("Class size not reduced, debug info not "

                        + "removed for " + path);

            }

            checkDebugAttributes(result1.contentBytes());

        }

        ResourcePoolEntry result2 = stripDebug(debug, result1, path, infoPath, moduleInfo);

        if (result1.contentLength() != result2.contentLength()) {

            throw new AssertionError("removing debug info twice reduces class size of "

                    + path);

        }

        checkDebugAttributes(result1.contentBytes());

    }

    private ResourcePoolEntry stripDebug(Plugin debug, ResourcePoolEntry classResource,

            String path, String infoPath, byte[] moduleInfo) throws Exception {

        ResourcePoolManager resources = new ResourcePoolManager();

        resources.add(classResource);

        if (!path.endsWith("module-info.class")) {

            ResourcePoolEntry res2 = ResourcePoolEntry.create(infoPath, moduleInfo);

            resources.add(res2);

        }

        ResourcePoolManager results = new ResourcePoolManager();

        ResourcePool resPool = debug.transform(resources.resourcePool(),

                results.resourcePoolBuilder());

        System.out.println(classResource.path());

        return resPool.findEntry(classResource.path()).get();

    }

    private void checkDebugAttributes(byte[] strippedClassFile) throws IOException, ConstantPoolException {

        ClassFile classFile = ClassFile.read(new ByteArrayInputStream(strippedClassFile));

        String[] debugAttributes = new String[]{

                Attribute.LineNumberTable,

                Attribute.LocalVariableTable,

                Attribute.LocalVariableTypeTable

        };

        for (Method method : classFile.methods) {

            String methodName = method.getName(classFile.constant_pool);

            Code_attribute code = (Code_attribute) method.attributes.get(Attribute.Code);

            for (String attr : debugAttributes) {

                if (code.attributes.get(attr) != null) {

                    throw new AssertionError("Debug attribute was not removed: " + attr +

                            " from method " + classFile.getName() + "#" + methodName);

                }

            }

        }

    }

}