// SPDX-FileCopyrightText: Copyright (C) 2025 The HMCL Authors
// SPDX-License-Identifier: GPL-3.0-or-later WITH AdditionRef-HMCL
package org.jackhuang.hmcl;

import java.io.File;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Locale;

/// @author Glavo
public final class DesktopUtils {
    private static final String[] linuxBrowsers = {
            "xdg-open",
            "google-chrome",
            "firefox",
            "microsoft-edge",
            "opera",
            "konqueror",
            "mozilla"
    };

    public static Path which(String command) {
        String path = System.getenv("PATH");
        if (path == null)
            return null;

        try {
            for (String item : path.split(File.pathSeparator)) {
                try {
                    Path program = Paths.get(item, command);
                    if (Files.isExecutable(program))
                        return program.toRealPath();
                } catch (Throwable ignored) {
                }
            }
        } catch (Throwable ignored) {
        }

        return null;
    }

    public static void openLink(String link) {
        if (!isAllowedOpenLink(link)) {
            System.err.println("Refusing to open link with disallowed scheme: " + link);
            return;
        }

        String osName = System.getProperty("os.name").toLowerCase(Locale.ROOT);

        Throwable e1 = null;
        try {
            if (osName.startsWith("windows")) {
                Runtime.getRuntime().exec(new String[]{"rundll32.exe", "url.dll,FileProtocolHandler", link});
                return;
            } else if (osName.startsWith("mac") || osName.startsWith("darwin")) {
                Runtime.getRuntime().exec(new String[]{"open", link});
                return;
            } else {
                for (String browser : linuxBrowsers) {
                    Path path = which(browser);
                    if (path != null) {
                        try {
                            Runtime.getRuntime().exec(new String[]{path.toString(), link});
                            return;
                        } catch (Throwable ignored) {
                        }
                    }
                }
                System.err.println("No known browser found");
            }
        } catch (Throwable e) {
            e1 = e;
        }

        try {
            java.awt.Desktop.getDesktop().browse(new URI(link));
        } catch (Throwable e2) {
            if (e1 != null)
                e2.addSuppressed(e1);

            e2.printStackTrace(System.err);
        }
    }

    /// Only {@code http}/{@code https}/{@code mailto} may be handed to the OS URL handler.
    static boolean isAllowedOpenLink(String link) {
        try {
            URI uri = new URI(link);
            String scheme = uri.getScheme();
            if (scheme == null) {
                return false;
            }
            String lower = scheme.toLowerCase(Locale.ROOT);
            return "http".equals(lower) || "https".equals(lower) || "mailto".equals(lower);
        } catch (Exception e) {
            return false;
        }
    }

    private DesktopUtils() {
    }
}