src/dk.biks.bachelorizer/dk/biks/bachelorizer/Main.java



// SPDX-FileCopyrightText: 2025 Jonas Smedegaard <dr@jones.dk>
// SPDX-License-Identifier: GPL-3.0-or-later

package dk.biks.bachelorizer;

import java.lang.UnsupportedOperationException;
import java.util.Arrays;

/// Bachelorizer - bachelor programme registrar
///
/// Tool for registering students
/// for activities in their bachelor programme.
///
/// Runner class spawning an interactive or non-interactive application
/// based on passed arguments
///
/// Multi-framework MVC structure inspired by project Криптоанализатор
/// written by Александр Хмелев <akhmelev@gmail.com>.
///
/// * v0.0.1-draft
///   * initial release, as part of delivery "Portfolio 1"
///
/// @version 0.0.1-draft
/// @see <https://moodle.ruc.dk/mod/assign/view.php?id=523186>
/// @see <https://github.com/demologin/CryptoAnalyzerLed>
public class Main {

    /// Default constructor
    ///
    /// @param args  command-line arguments or default demo data
    public Main(final String[] args) {

        switch (uiFromArgs(args)) {
            case "gui" -> { Window.main(args); }
// TODO         case "tui" -> { Screen.main(args); }
// TODO         case "cli" -> { Prompt.main(args); }
            default -> {
                throw new UnsupportedOperationException(
                    "Not yet implemented.");
            }
        }
    }

    /// JVM entry point
    ///
    /// @param args  command-line arguments
    public static void main(String[] args) {

        // inject initial sample data unless passed as arguments
        if ((args.length == 0)
            || (!Arrays.stream(args).anyMatch(
                s -> s != null && !s.startsWith("-")))
        ) {
            args = new String[] {
                "Jonas Smedegaard",
                "CS-SMC2",
                "CS-SMC3",
            };
        }

        new Main(args);
    }

    /// minimal argument parser to detect explicit UI choice
    ///
    /// @param args  command-line arguments
    /// @return      choice of UI as String
    public static String uiFromArgs(String[] args) {
        // TODO: make "cli" the default when implemented
        String defaultUI = "gui";

        for (String arg : args) {
            if (arg.matches("--(gui|tui|cli)")) {
                return (arg.length() == 2)
                    ? defaultUI
                    : arg.substring(2);
            }
        }

        return defaultUI;
    }
}