/*

 * Copyright (c) 2015, 2018, 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.packager.internal;

import java.io.BufferedReader;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.util.Optional;

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

import java.lang.module.ModuleDescriptor;

import java.lang.module.ModuleFinder;

import java.lang.module.ModuleReference;

import java.lang.module.ModuleReader;

import java.nio.file.Path;

import java.util.HashSet;

import java.util.LinkedHashSet;

import java.util.List;

import java.util.NoSuchElementException;

import java.util.Set;

public final class RedistributableModules {

    private static final String JDK_PACKAGER_MODULE = "jdk.packager";

    private RedistributableModules() {}

    public static String stripComments(String line) {

        String result = line.trim();

        int i = result.indexOf(";");

        if (i >= 0) {

          result = result.substring(0, i);

          result = result.trim();

        }

        return result;

    }

    public static Set<String> getRedistributableModules(List<Path> modulePath,

            String filename) {

        Set<String> result = null;

        Set<String> addModules = new HashSet<>();

        Set<String> limitModules = new HashSet<>();

        ModuleFinder finder = AppRuntimeImageBuilder.moduleFinder(modulePath, addModules, limitModules);

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

        if (mref.isPresent()) {

            ModuleReader reader = null;

            try {

                reader = mref.get().open();

            } catch (NoSuchElementException | IOException ex) {

            }

            if (reader != null) {

                Optional<InputStream> stream = null;

                try {

                    stream = reader.open(filename);

                } catch (IOException ex) {

                }

                if (stream != null) {

                    if (stream.isPresent()) {

                        BufferedReader br = null;

                        try {

                            br = new BufferedReader(new InputStreamReader(

                                    stream.get(), "UTF-8"));

                        } catch (UnsupportedEncodingException ex) {

                        }

                        if (br != null) {

                            result = new LinkedHashSet();

                            String line;

                            try {

                                while ((line = br.readLine()) != null) {

                                    String module = stripComments(line);

                                    if (!module.isEmpty()) {

                                        result.add(module);

                                    }

                                }

                            } catch (IOException ex) {

                            }

                        }

                    }

                }

            }

        }

        return result;

    }

    public static String getModuleVersion(File moduleFile, List<Path> modulePath,

            Set<String> addModules, Set<String> limitModules) {

        String result = "";

        Module module = new Module(moduleFile);

        ModuleFinder finder = AppRuntimeImageBuilder.moduleFinder(modulePath,

                addModules, limitModules);

        Optional<ModuleReference> mref = finder.find(module.getModuleName());

        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;

    }

}