/*

 * Copyright (c) 2006, 2017, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**

 * @test

 * @bug     6374357 6308351 6707027

 * @summary PackageElement.getEnclosedElements() throws ClassReader$BadClassFileException

 * @author  Peter von der Ah\u00e9

 * @modules jdk.compiler/com.sun.tools.javac.model

 */

import java.io.File;

import java.nio.file.Path;

import java.util.*;

import java.util.Map.Entry;

import javax.lang.model.element.Element;

import javax.lang.model.element.ElementKind;

import javax.lang.model.element.ModuleElement;

import javax.lang.model.element.PackageElement;

import javax.lang.model.element.TypeElement;

import javax.lang.model.util.Elements;

import javax.tools.*;

import com.sun.source.util.JavacTask;

import com.sun.tools.javac.model.JavacElements;

import static javax.tools.StandardLocation.CLASS_PATH;

import static javax.tools.StandardLocation.PLATFORM_CLASS_PATH;

import static javax.tools.JavaFileObject.Kind.CLASS;

public class Main {

    public static PackageElement getPackage(TypeElement type) {

        Element owner = type;

        while (owner.getKind() != ElementKind.PACKAGE)

            owner = owner.getEnclosingElement();

        return (PackageElement)owner;

    }

    static int progress = 0;

    static JavaCompiler tool;

    static JavacTask javac;

    static Elements elements;

    static List<String> addmods_ALL_SYSTEM = Arrays.asList("--add-modules", "ALL-SYSTEM");

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

        JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        try (StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null)) {

            fm.setLocation(CLASS_PATH, Collections.<File>emptyList());

            JavacTask javac = (JavacTask)tool.getTask(null, fm, null, addmods_ALL_SYSTEM, null, null);

            Elements elements = javac.getElements();

            final Map<String, Set<String>> packages = new LinkedHashMap<>();

            int nestedClasses = 0;

            int classes = 0;

            for (JavaFileObject file : fm.list(PLATFORM_CLASS_PATH, "", EnumSet.of(CLASS), true)) {

                String type = fm.inferBinaryName(PLATFORM_CLASS_PATH, file);

                if (type.endsWith("package-info"))

                    continue;

                if (type.endsWith("module-info"))

                    continue;

                Path path = fm.asPath(file);

                int moduleIndex = path.getNameCount() - type.split("\\Q.\\E").length - 1;

                String moduleName = path.getName(moduleIndex).toString();

                if (moduleName.startsWith("jdk.incubator.")) //incubator modules not in module graph by default

                    continue;

                try {

                    ModuleElement me = elements.getModuleElement(moduleName);

                    me.getClass();

                    TypeElement elem = ((JavacElements) elements).getTypeElement(me, type);

                    if (elem == null && type.indexOf('$') > 0) {

                        nestedClasses++;

                        type = null;

                        continue;

                    }

                    classes++;

                    String pack = getPackage(elem).getQualifiedName().toString();

                    packages.computeIfAbsent(me.getQualifiedName().toString(),

                                             m -> new LinkedHashSet<>()).add(pack);

                    elem.getKind(); // force completion

                    type = null;

                } finally {

                    if (type != null)

                        System.err.println("Looking at " + type);

                }

            }

            javac = null;

            elements = null;

            javac = (JavacTask)tool.getTask(null, fm, null, addmods_ALL_SYSTEM, null, null);

            elements = javac.getElements();

            for (Entry<String, Set<String>> module2Packages : packages.entrySet()) {

                ModuleElement me = elements.getModuleElement(module2Packages.getKey());

                me.getClass();

                for (String name : module2Packages.getValue()) {

                    PackageElement pe = ((JavacElements) elements).getPackageElement(me, name);

                    for (Element e : pe.getEnclosedElements()) {

                        e.getSimpleName().getClass();

                    }

                }

            }

            /*

             * A few sanity checks based on current values:

             *

             * packages: 775, classes: 12429 + 5917

             *

             * As the platform evolves the numbers are likely to grow

             * monotonically but in case somebody gets a clever idea for

             * limiting the number of packages exposed, this number might

             * drop.  So we test low values.

             */

            System.out.format("packages: %s, classes: %s + %s%n",

                              packages.size(), classes, nestedClasses);

            if (classes < 9000)

                throw new AssertionError("Too few classes in PLATFORM_CLASS_PATH ;-)");

            if (packages.values().stream().flatMap(packs -> packs.stream()).count() < 530)

                throw new AssertionError("Too few packages in PLATFORM_CLASS_PATH ;-)");

            if (nestedClasses < 3000)

                throw new AssertionError("Too few nested classes in PLATFORM_CLASS_PATH ;-)");

        }

    }

}