/*

 * 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

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package jdk.jpackage.internal;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.nio.file.Files;

import java.nio.file.Path;

import java.text.MessageFormat;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import static jdk.jpackage.internal.StandardBundlerParam.*;

public class LinuxAppImageBuilder extends AbstractAppImageBuilder {

    private static final String LIBRARY_NAME = "libapplauncher.so";

    final static String DEFAULT_ICON = "java32.png";

    private final ApplicationLayout appLayout;

    public static final BundlerParamInfo<File> ICON_PNG =

            new StandardBundlerParam<>(

            "icon.png",

            File.class,

            params -> {

                File f = ICON.fetchFrom(params);

                if (f != null && !f.getName().toLowerCase().endsWith(".png")) {

                    Log.error(MessageFormat.format(I18N.getString(

                            "message.icon-not-png"), f));

                    return null;

                }

                return f;

            },

            (s, p) -> new File(s));

    private static ApplicationLayout createAppLayout(Map<String, Object> params,

            Path imageOutDir) {

        return ApplicationLayout.linuxAppImage().resolveAt(

                imageOutDir.resolve(APP_NAME.fetchFrom(params)));

    }

    public LinuxAppImageBuilder(Map<String, Object> params, Path imageOutDir)

            throws IOException {

        super(params, createAppLayout(params, imageOutDir).runtimeDirectory());

        appLayout = createAppLayout(params, imageOutDir);

    }

    private void writeEntry(InputStream in, Path dstFile) throws IOException {

        Files.createDirectories(dstFile.getParent());

        Files.copy(in, dstFile);

    }

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

        return APP_NAME.fetchFrom(params);

    }

    private Path getLauncherCfgPath(Map<String, ? super Object> params) {

        return appLayout.appDirectory().resolve(

                APP_NAME.fetchFrom(params) + ".cfg");

    }

    @Override

    public Path getAppDir() {

        return appLayout.appDirectory();

    }

    @Override

    public Path getAppModsDir() {

        return appLayout.appModsDirectory();

    }

    @Override

    protected String getCfgAppDir() {

        return Path.of("$ROOTDIR").resolve(

                ApplicationLayout.linuxAppImage().appDirectory()).toString()

                + File.separator;

    }

    @Override

    protected String getCfgRuntimeDir() {

        return Path.of("$ROOTDIR").resolve(

              ApplicationLayout.linuxAppImage().runtimeDirectory()).toString();

    }

    @Override

    public void prepareApplicationFiles(Map<String, ? super Object> params)

            throws IOException {

        Map<String, ? super Object> originalParams = new HashMap<>(params);

        appLayout.roots().stream().forEach(dir -> {

            try {

                IOUtils.writableOutputDir(dir);

            } catch (PackagerException pe) {

                throw new RuntimeException(pe);

            }

        });

        // create the primary launcher

        createLauncherForEntryPoint(params);

        // Copy library to the launcher folder

        try (InputStream is_lib = getResourceAsStream(LIBRARY_NAME)) {

            writeEntry(is_lib, appLayout.dllDirectory().resolve(LIBRARY_NAME));

        }

        // create the additional launchers, if any

        List<Map<String, ? super Object>> entryPoints

                = StandardBundlerParam.ADD_LAUNCHERS.fetchFrom(params);

        for (Map<String, ? super Object> entryPoint : entryPoints) {

            createLauncherForEntryPoint(

                    AddLauncherArguments.merge(originalParams, entryPoint));

        }

        // Copy class path entries to Java folder

        copyApplication(params);

        // Copy icon to Resources folder

        copyIcon(params);

    }

    @Override

    public void prepareJreFiles(Map<String, ? super Object> params)

            throws IOException {}

    private void createLauncherForEntryPoint(

            Map<String, ? super Object> params) throws IOException {

        // Copy executable to launchers folder

        Path executableFile = appLayout.launchersDirectory().resolve(getLauncherName(params));

        try (InputStream is_launcher =

                getResourceAsStream("jpackageapplauncher")) {

            writeEntry(is_launcher, executableFile);

        }

        executableFile.toFile().setExecutable(true, false);

        executableFile.toFile().setWritable(true, true);

        writeCfgFile(params, getLauncherCfgPath(params).toFile());

    }

    private void copyIcon(Map<String, ? super Object> params)

            throws IOException {

    }

    private void copyApplication(Map<String, ? super Object> params)

            throws IOException {

        for (RelativeFileSet appResources :

                APP_RESOURCES_LIST.fetchFrom(params)) {

            if (appResources == null) {

                throw new RuntimeException("Null app resources?");

            }

            File srcdir = appResources.getBaseDirectory();

            for (String fname : appResources.getIncludedFiles()) {

                copyEntry(appLayout.appDirectory(), srcdir, fname);

            }

        }

    }

}