package org.openautonomousconnection.luascript.fx;

import java.util.Locale;

/**
 * Shared extension helper for media sources.
 */
public final class MediaExtensions {

    /**
     * Extracts a lower-case extension without dot, or empty string if none.
     *
     * @param pathOrName path or file name
     * @return extension without dot, lower-case, or empty string
     */
    public static String extensionOf(String pathOrName) {
        if (pathOrName == null) return "";
        String s = pathOrName.trim();
        if (s.isEmpty()) return "";

        int q = s.indexOf('?');
        if (q >= 0) s = s.substring(0, q);
        int h = s.indexOf('#');
        if (h >= 0) s = s.substring(0, h);

        int slash = Math.max(s.lastIndexOf('/'), s.lastIndexOf('\\'));
        String name = (slash >= 0) ? s.substring(slash + 1) : s;

        int dot = name.lastIndexOf('.');
        if (dot < 0 || dot == name.length() - 1) return "";

        return name.substring(dot + 1).toLowerCase(Locale.ROOT);
    }
}