/*

 * Copyright (c) 2016, 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.tools.jlink.internal.plugins;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.UncheckedIOException;

import java.lang.module.ModuleDescriptor;

import java.util.EnumSet;

import java.util.HashMap;

import java.util.Map;

import java.util.Optional;

import java.util.Properties;

import java.util.Set;

import java.util.function.Function;

import java.util.stream.Collectors;

import jdk.tools.jlink.internal.ModuleSorter;

import jdk.tools.jlink.internal.Utils;

import jdk.tools.jlink.plugin.ResourcePool;

import jdk.tools.jlink.plugin.ResourcePoolBuilder;

import jdk.tools.jlink.plugin.ResourcePoolEntry;

import jdk.tools.jlink.plugin.ResourcePoolModule;

import jdk.tools.jlink.plugin.Plugin;

/**

 * This plugin adds/deletes information for 'release' file.

 */

public final class ReleaseInfoPlugin implements Plugin {

    // option name

    public static final String NAME = "release-info";

    public static final String KEYS = "keys";

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

    @Override

    public Category getType() {

        return Category.METAINFO_ADDER;

    }

    @Override

    public String getName() {

        return NAME;

    }

    @Override

    public String getDescription() {

        return PluginsResourceBundle.getDescription(NAME);

    }

    @Override

    public Set<State> getState() {

        return EnumSet.of(State.AUTO_ENABLED, State.FUNCTIONAL);

    }

    @Override

    public boolean hasArguments() {

        return true;

    }

    @Override

    public String getArgumentsDescription() {

        return PluginsResourceBundle.getArgument(NAME);

    }

    @Override

    public void configure(Map<String, String> config) {

        String operation = config.get(NAME);

        if (operation == null) {

            return;

        }

        switch (operation) {

            case "add": {

                // leave it to open-ended! source, java_version, java_full_version

                // can be passed via this option like:

                //

                //     --release-info add:build_type=fastdebug,source=openjdk,java_version=9

                // and put whatever value that was passed in command line.

            }

            break;

            case "del": {

                // --release-info del:keys=openjdk,java_version

                Utils.parseList(config.get(KEYS)).stream().forEach((k) -> {

                    release.remove(k);

                });

            }

            break;

            default: {

                // --release-info <file>

                Properties props = new Properties();

                try (FileInputStream fis = new FileInputStream(operation)) {

                    props.load(fis);

                } catch (IOException exp) {

                    throw new UncheckedIOException(exp);

                }

                props.forEach((k, v) -> release.put(k.toString(), v.toString()));

            }

            break;

        }

    }

    @Override

    public ResourcePool transform(ResourcePool in, ResourcePoolBuilder out) {

        in.transformAndCopy(Function.identity(), out);

        Optional<ResourcePoolModule> javaBase = in.moduleView().findModule("java.base");

        javaBase.ifPresent(mod -> {

            // fill release information available from transformed "java.base" module!

            ModuleDescriptor desc = mod.descriptor();

            desc.version().ifPresent(s -> release.put("JAVA_VERSION",

                    quote(parseVersion(s.toString()))));

            desc.version().ifPresent(s -> release.put("JAVA_FULL_VERSION",

                    quote(s.toString())));

            release.put("OS_NAME", quote(mod.osName()));

            release.put("OS_ARCH", quote(mod.osArch()));

        });

        // put topological sorted module names separated by space

        release.put("MODULES",  new ModuleSorter(in.moduleView())

        // create a TOP level ResourcePoolEntry for "release" file.

        out.add(ResourcePoolEntry.create("/java.base/release",

            ResourcePoolEntry.Type.TOP, releaseFileContent()));

        return out.build();

    }

    // Parse version string and return a string that includes only version part

    // leaving "pre", "build" information. See also: java.lang.Runtime.Version.

    private static String parseVersion(String str) {

    }

    private static String quote(String str) {

        return "\"" + str + "\"";

    }

    private byte[] releaseFileContent() {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        }

    }

}