/*

 * Copyright (c) 2015, 2019, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package jdk.jpackage.internal;

import java.io.File;

import java.io.IOException;

import java.io.StringReader;

import java.nio.file.Files;

import java.nio.file.Path;

import java.text.MessageFormat;

import java.util.Collection;

import java.util.Collections;

import java.util.EnumSet;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.LinkedHashMap;

import java.util.LinkedHashSet;

import java.util.List;

import java.util.Map;

import java.util.Properties;

import java.util.ResourceBundle;

import java.util.Set;

import java.util.Optional;

import java.lang.module.ModuleDescriptor;

import java.lang.module.ModuleFinder;

import java.lang.module.ModuleReference;

import jdk.tools.jlink.internal.packager.AppRuntimeImageBuilder;

final class JLinkBundlerHelper {

    private static final ResourceBundle I18N = ResourceBundle.getBundle(

            "jdk.jpackage.internal.resources.MainResources");

    private static final String JRE_MODULES_FILENAME =

            "jdk/jpackage/internal/resources/jre.list";

    private static final String SERVER_JRE_MODULES_FILENAME =

            "jdk/jpackage/internal/resources/jre.module.list";

    private JLinkBundlerHelper() {}

    @SuppressWarnings("unchecked")

    static final BundlerParamInfo<String> JLINK_BUILDER =

            new StandardBundlerParam<>(

                    I18N.getString("param.jlink-builder.name"),

                    I18N.getString("param.jlink-builder.description"),

                    "jlink.builder",

                    String.class,

                    null,

                    (s, p) -> s);

    @SuppressWarnings("unchecked")

    static final BundlerParamInfo<Integer> DEBUG =

            new StandardBundlerParam<>(

                    "",

                    "",

                    "-J-Xdebug",

                    Integer.class,

                    p -> null,

                    (s, p) -> {

                        return Integer.valueOf(s);

                    });

    static String listOfPathToString(List<Path> value) {

        String result = "";

        for (Path path : value) {

            if (result.length() > 0) {

                result += File.pathSeparator;

            }

            result += path.toString();

        }

        return result;

    }

    static String setOfStringToString(Set<String> value) {

        String result = "";

        for (String element : value) {

            if (result.length() > 0) {

                result += ",";

            }

            result += element;

        }

        return result;

    }

    static File getMainJar(Map<String, ? super Object> params) {

        File result = null;

        RelativeFileSet fileset =

                StandardBundlerParam.MAIN_JAR.fetchFrom(params);

        if (fileset != null) {

            String filename = fileset.getIncludedFiles().iterator().next();

            result = fileset.getBaseDirectory().toPath().

                    resolve(filename).toFile();

            if (result == null || !result.exists()) {

                String srcdir =

                    StandardBundlerParam.SOURCE_DIR.fetchFrom(params);

                if (srcdir != null) {

                    result = new File(srcdir + File.separator + filename);

                }

            }

        }

        return result;

    }

    static String getMainClass(Map<String, ? super Object> params) {

        String result = "";

        String mainModule = StandardBundlerParam.MODULE.fetchFrom(params);

        if (mainModule != null)  {

            int index = mainModule.indexOf("/");

            if (index > 0) {

                result = mainModule.substring(index + 1);

            }

        } else {

            RelativeFileSet fileset =

                    StandardBundlerParam.MAIN_JAR.fetchFrom(params);

            if (fileset != null) {

                result = StandardBundlerParam.MAIN_CLASS.fetchFrom(params);

            } else {

                // possibly app-image

            }

        }

        return result;

    }

    static String getMainModule(Map<String, ? super Object> params) {

        String result = "";

        String mainModule = StandardBundlerParam.MODULE.fetchFrom(params);

        if (mainModule != null) {

            int index = mainModule.indexOf("/");

            if (index > 0) {

                result = mainModule.substring(0, index);

            } else {

                result = mainModule;

            }

        }

        return result;

    }

    static String getJDKVersion(Map<String, ? super Object> params) {

        String result = "";

        List<Path> modulePath =

                StandardBundlerParam.MODULE_PATH.fetchFrom(params);

        Set<String> limitModules =

                StandardBundlerParam.LIMIT_MODULES.fetchFrom(params);

        Path javaBasePath = findPathOfModule(modulePath, "java.base.jmod");

        Set<String> addModules = getValidModules(modulePath,

                StandardBundlerParam.ADD_MODULES.fetchFrom(params),

        if (javaBasePath != null && javaBasePath.toFile().exists()) {

            result = getModuleVersion(javaBasePath.toFile(),

                    modulePath, addModules, limitModules);

        }

        return result;

    }

    static Path getJDKHome(Map<String, ? super Object> params) {

        Path result = null;

        List<Path> modulePath =

                StandardBundlerParam.MODULE_PATH.fetchFrom(params);

        Path javaBasePath = findPathOfModule(modulePath, "java.base.jmod");

        if (javaBasePath != null && javaBasePath.toFile().exists()) {

            result = javaBasePath.getParent();

            // On a developer build the JDK Home isn't where we expect it

            // relative to the jmods directory. Do some extra

            // processing to find it.

            if (result != null) {

                boolean found = false;

                Path bin = result.resolve("bin");

                if (Files.exists(bin)) {

                    final String exe =

                            (Platform.getPlatform() == Platform.WINDOWS) ?

                            ".exe" : "";

                    Path javaExe = bin.resolve("java" + exe);

                    if (Files.exists(javaExe)) {

                        found = true;

                    }

                }

                if (!found) {

                    result = result.resolve(".." + File.separator + "jdk");

                }

            }

        }

        return result;

    }

    private static Set<String> getValidModules(List<Path> modulePath,

        ModuleHelper moduleHelper = new ModuleHelper(

        return removeInvalidModules(modulePath, moduleHelper.modules());

    }

    static void execute(Map<String, ? super Object> params,

            AbstractAppImageBuilder imageBuilder)

            throws IOException, Exception {

        List<Path> modulePath =

                StandardBundlerParam.MODULE_PATH.fetchFrom(params);

        Set<String> addModules =

                StandardBundlerParam.ADD_MODULES.fetchFrom(params);

        Set<String> limitModules =

                StandardBundlerParam.LIMIT_MODULES.fetchFrom(params);

        boolean stripNativeCommands =

                StandardBundlerParam.STRIP_NATIVE_COMMANDS.fetchFrom(params);

        Path outputDir = imageBuilder.getRoot();

        String excludeFileList = imageBuilder.getExcludeFileList();

        File mainJar = getMainJar(params);

        ModFile.ModType mainJarType = ModFile.ModType.Unknown;

        if (mainJar != null) {

            mainJarType = new ModFile(mainJar).getModType();

        } else if (StandardBundlerParam.MODULE.fetchFrom(params) == null) {

            // user specified only main class, all jars will be on the classpath

            mainJarType = ModFile.ModType.UnnamedJar;

        }

        // Modules

        if (mainJarType == ModFile.ModType.UnnamedJar) {

        } else if (mainJarType == ModFile.ModType.Unknown ||

                mainJarType == ModFile.ModType.ModularJar) {

            String mainModule = getMainModule(params);

            addModules.add(mainModule);

        }

        addModules.addAll(getValidModules(

        Log.verbose(MessageFormat.format(

                I18N.getString("message.modules"), addModules.toString()));

        AppRuntimeImageBuilder appRuntimeBuilder = new AppRuntimeImageBuilder();

        appRuntimeBuilder.setOutputDir(outputDir);

        appRuntimeBuilder.setModulePath(modulePath);

        appRuntimeBuilder.setAddModules(addModules);

        appRuntimeBuilder.setLimitModules(limitModules);

        appRuntimeBuilder.setExcludeFileList(excludeFileList);

        appRuntimeBuilder.setStripNativeCommands(stripNativeCommands);

        appRuntimeBuilder.setUserArguments(new HashMap<String,String>());

        appRuntimeBuilder.build();

        imageBuilder.prepareApplicationFiles();

    }

    static void generateJre(Map<String, ? super Object> params,

            AbstractAppImageBuilder imageBuilder)

            throws IOException, Exception {

        List<Path> modulePath =

                StandardBundlerParam.MODULE_PATH.fetchFrom(params);

        Set<String> addModules =

                StandardBundlerParam.ADD_MODULES.fetchFrom(params);

        Set<String> limitModules =

                StandardBundlerParam.LIMIT_MODULES.fetchFrom(params);

        boolean stripNativeCommands =

                StandardBundlerParam.STRIP_NATIVE_COMMANDS.fetchFrom(params);

        Path outputDir = imageBuilder.getRoot();

        Set<String> redistModules = getValidModules(modulePath,

        addModules.addAll(redistModules);

        Log.verbose(MessageFormat.format(

                I18N.getString("message.modules"), addModules.toString()));

        AppRuntimeImageBuilder appRuntimeBuilder = new AppRuntimeImageBuilder();

        appRuntimeBuilder.setOutputDir(outputDir);

        appRuntimeBuilder.setModulePath(modulePath);

        appRuntimeBuilder.setAddModules(addModules);

        appRuntimeBuilder.setLimitModules(limitModules);

        appRuntimeBuilder.setStripNativeCommands(stripNativeCommands);

        appRuntimeBuilder.setExcludeFileList("");

        appRuntimeBuilder.setUserArguments(new HashMap<String,String>());

        appRuntimeBuilder.build();

        imageBuilder.prepareJreFiles();

    }

    // Returns the path to the JDK modules in the user defined module path.

    static Path findPathOfModule(

            List<Path> modulePath, String moduleName) {

        Path result = null;

        for (Path path : modulePath) {

            Path moduleNamePath = path.resolve(moduleName);

            if (Files.exists(moduleNamePath)) {

                result = path;

                break;

            }

        }

        return result;

    }

    private static Set<String> removeInvalidModules(

            List<Path> modulePath, Set<String> modules) {

        Set<String> result = new LinkedHashSet<String>();

        ModuleManager mm = new ModuleManager(modulePath);

        List<ModFile> lmodfiles =

                mm.getModules(EnumSet.of(ModuleManager.SearchType.ModularJar,

                        ModuleManager.SearchType.Jmod,

                        ModuleManager.SearchType.ExplodedModule));

        HashMap<String, ModFile> validModules = new HashMap<>();

        for (ModFile modFile : lmodfiles) {

            validModules.put(modFile.getModName(), modFile);

        }

        for (String name : modules) {

            if (validModules.containsKey(name)) {

                result.add(name);

            } else {

                Log.error(MessageFormat.format(

                        I18N.getString("warning.module.does.not.exist"), name));

            }

        }

        return result;

    }

    private static String getModuleVersion(File moduleFile,

            List<Path> modulePath, Set<String> addModules,

            Set<String> limitModules) {

        String result = "";

        ModFile modFile = new ModFile(moduleFile);

        ModuleFinder finder = AppRuntimeImageBuilder.moduleFinder(modulePath,

                addModules, limitModules);

        Optional<ModuleReference> mref = finder.find(modFile.getModName());

        if (mref.isPresent()) {

            ModuleDescriptor descriptor = mref.get().descriptor();

            if (descriptor != null) {

                Optional<ModuleDescriptor.Version> version =

                        descriptor.version();

                if (version.isPresent()) {

                    result = version.get().toString();

                }

            }

        }

        return result;

    }

    private static class ModuleHelper {

        // The token for "all modules on the module path".

        private static final String ALL_MODULE_PATH = "ALL-MODULE-PATH";

        // The token for "all valid runtime modules".

        private final Set<String> modules = new HashSet<>();

        private enum Macros {None, AllModulePath, AllRuntime}

                    iterator.hasNext();) {

                String module = iterator.next();

                switch (module) {

                    case ALL_MODULE_PATH:

                        iterator.remove();

                        break;

                        iterator.remove();

                        break;

                    default:

                        this.modules.add(module);

                }

            }

            }

        }

        Set<String> modules() {

            return modules;

        }

        }

    }

}