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 * 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.
 *
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package jdk.jpackage.internal;

import static jdk.jpackage.internal.ApplicationBuilder.normalizeLauncherProperty;
import static jdk.jpackage.internal.ApplicationImageUtils.createLauncherIconResource;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Optional;
import jdk.jpackage.internal.PackagingPipeline.AppImageBuildEnv;
import jdk.jpackage.internal.PackagingPipeline.BuildApplicationTaskID;
import jdk.jpackage.internal.PackagingPipeline.PrimaryTaskID;
import jdk.jpackage.internal.PackagingPipeline.TaskID;
import jdk.jpackage.internal.model.Application;
import jdk.jpackage.internal.model.ApplicationLaunchers;
import jdk.jpackage.internal.model.ApplicationLayout;
import jdk.jpackage.internal.model.Launcher;
import jdk.jpackage.internal.model.LauncherShortcut;
import jdk.jpackage.internal.model.LinuxLauncher;
import jdk.jpackage.internal.model.LinuxLauncherMixin;
import jdk.jpackage.internal.model.LinuxPackage;
import jdk.jpackage.internal.resources.ResourceLocator;

final class LinuxPackagingPipeline {

    enum LinuxAppImageTaskID implements TaskID {
        LAUNCHER_LIB,
        LAUNCHER_ICONS
    }

    static PackagingPipeline.Builder build(Optional<LinuxPackage> pkg) {
        var builder = PackagingPipeline.buildStandard()
                .task(LinuxAppImageTaskID.LAUNCHER_LIB)
                        .addDependent(PrimaryTaskID.BUILD_APPLICATION_IMAGE)
                        .applicationAction(LinuxPackagingPipeline::writeLauncherLib).add()
                .task(LinuxAppImageTaskID.LAUNCHER_ICONS)
                        .addDependent(BuildApplicationTaskID.CONTENT)
                        .applicationAction(LinuxPackagingPipeline::writeLauncherIcons).add();

        pkg.ifPresent(_ -> {
            builder.task(LinuxAppImageTaskID.LAUNCHER_ICONS).noaction().add();
        });

        return builder;
    }

    static ApplicationLaunchers normalizeShortcuts(ApplicationLaunchers appLaunchers) {
        return normalizeLauncherProperty(appLaunchers, launcher -> {
            // Return "true" if shortcut is not configured for the launcher.
            return launcher.shortcut().isEmpty();
        }, (LinuxLauncher launcher) -> {
            return launcher.shortcut().flatMap(LauncherShortcut::startupDirectory);
        }, (launcher, shortcut) -> {
            return LinuxLauncher.create(launcher, new LinuxLauncherMixin.Stub(Optional.of(new LauncherShortcut(shortcut))));
        });
    }

    private static void writeLauncherLib(
            AppImageBuildEnv<Application, LinuxApplicationLayout> env) throws IOException {

        final var launcherLib = env.resolvedLayout().libAppLauncher();
        try (var in = ResourceLocator.class.getResourceAsStream("libjpackageapplauncheraux.so")) {
            Files.createDirectories(launcherLib.getParent());
            Files.copy(in, launcherLib);
        }
    }

    private static void writeLauncherIcons(
            AppImageBuildEnv<Application, ApplicationLayout> env) throws IOException {

        env.app().launchers().stream().filter(Launcher::hasCustomIcon).forEach(launcher -> {
            createLauncherIconResource(launcher, env.env()::createResource).ifPresent(iconResource -> {
                String iconFileName = launcher.executableName() + ".png";
                Path iconTarget = env.resolvedLayout().desktopIntegrationDirectory().resolve(iconFileName);
                try {
                    iconResource.saveToFile(iconTarget);
                } catch (IOException ex) {
                    throw new UncheckedIOException(ex);
                }
            });
        });
    }

    private static final ApplicationLayout LINUX_APPLICATION_LAYOUT = ApplicationLayout.build()
            .launchersDirectory("bin")
            .appDirectory("lib/app")
            .runtimeDirectory("lib/runtime")
            .desktopIntegrationDirectory("lib")
            .appModsDirectory("lib/app/mods")
            .contentDirectory("lib")
            .create();

    static final LinuxApplicationLayout APPLICATION_LAYOUT = LinuxApplicationLayout.create(
            LINUX_APPLICATION_LAYOUT, Path.of("lib/libapplauncher.so"));
}