/*

 * 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.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.UncheckedIOException;

import java.io.Writer;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.attribute.PosixFilePermission;

import java.text.MessageFormat;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Objects;

import java.util.ResourceBundle;

import java.util.Set;

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

public class LinuxAppImageBuilder extends AbstractAppImageBuilder {

    private static final ResourceBundle I18N = ResourceBundle.getBundle(

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

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

    private final Path root;

    private final Path appDir;

    private final Path appModsDir;

    private final Path runtimeDir;

    private final Path resourcesDir;

    private final Path mdir;

    private final Map<String, ? super Object> params;

    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));

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

            throws IOException {

        super(config,

                imageOutDir.resolve(APP_NAME.fetchFrom(config) + "/runtime"));

        Objects.requireNonNull(imageOutDir);

        this.root = imageOutDir.resolve(APP_NAME.fetchFrom(config));

        this.appDir = root.resolve("app");

        this.appModsDir = appDir.resolve("mods");

        this.runtimeDir = root.resolve("runtime");

        this.resourcesDir = root.resolve("resources");

        this.mdir = runtimeDir.resolve("lib");

        this.params = new HashMap<>();

        config.entrySet().stream().forEach(e -> params.put(

                e.getKey().toString(), e.getValue()));

        Files.createDirectories(appDir);

        Files.createDirectories(runtimeDir);

        Files.createDirectories(resourcesDir);

    }

    public LinuxAppImageBuilder(String appName, Path imageOutDir)

            throws IOException {

        super(null, imageOutDir.resolve(appName));

        Objects.requireNonNull(imageOutDir);

        this.root = imageOutDir.resolve(appName);

        this.appDir = null;

        this.appModsDir = null;

        this.runtimeDir = null;

        this.resourcesDir = null;

        this.mdir = null;

        this.params = new HashMap<>();

    }

    private Path destFile(String dir, String filename) {

        return runtimeDir.resolve(dir).resolve(filename);

    }

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

        Files.createDirectories(dstFile.getParent());

        Files.copy(in, dstFile);

    }

    private void writeSymEntry(Path dstFile, Path target) throws IOException {

        Files.createDirectories(dstFile.getParent());

        Files.createLink(dstFile, target);

    }

    /**

     * chmod ugo+x file

     */

    private void setExecutable(Path file) {

        try {

            Set<PosixFilePermission> perms =

                    Files.getPosixFilePermissions(file);

            perms.add(PosixFilePermission.OWNER_EXECUTE);

            perms.add(PosixFilePermission.GROUP_EXECUTE);

            perms.add(PosixFilePermission.OTHERS_EXECUTE);

            Files.setPosixFilePermissions(file, perms);

        } catch (IOException ioe) {

            throw new UncheckedIOException(ioe);

        }

    }

    private static void createUtf8File(File file, String content)

            throws IOException {

        try (OutputStream fout = new FileOutputStream(file);

            Writer output = new OutputStreamWriter(fout, "UTF-8")) {

            output.write(content);

        }

    }

    // it is static for the sake of sharing with "installer" bundlers

    // that may skip calls to validate/bundle in this class!

    public static File getRootDir(File outDir, Map<String, ? super Object> p) {

        return new File(outDir, APP_NAME.fetchFrom(p));

    }

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

        return APP_NAME.fetchFrom(p);

    }

    public static String getLauncherCfgName(Map<String, ? super Object> p) {

        return "app/" + APP_NAME.fetchFrom(p) + ".cfg";

    }

    @Override

    public Path getAppDir() {

        return appDir;

    }

    @Override

    public Path getAppModsDir() {

        return appModsDir;

    }

    @Override

    public void prepareApplicationFiles() throws IOException {

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

        // create the primary launcher

        createLauncherForEntryPoint(params);

        // Copy library to the launcher folder

        try (InputStream is_lib = getResourceAsStream(LIBRARY_NAME)) {

            writeEntry(is_lib, root.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();

        // Copy icon to Resources folder

        copyIcon();

    }

    @Override

    public void prepareJreFiles() throws IOException {}

            throws IOException {

        // Copy executable to Linux folder

        Path executableFile = root.resolve(getLauncherName(p));

        try (InputStream is_launcher =

                getResourceAsStream("jpackageapplauncher")) {

            writeEntry(is_launcher, executableFile);

        }

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

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

        writeCfgFile(p, root.resolve(getLauncherCfgName(p)).toFile(),

                "$APPDIR/runtime");

    }

    private void copyIcon() throws IOException {

        File icon = ICON_PNG.fetchFrom(params);

        if (icon != null) {

            File iconTarget = new File(resourcesDir.toFile(),

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

            IOUtils.copyFile(icon, iconTarget);

        }

    }

    private void copyApplication() 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(appDir, srcdir, fname);

            }

        }

    }

}