import { Gtk } from "ags/gtk4";
import Gio from "gi://Gio";

export function watchFile(
    path: string,
    onChange: () => void,
    owner: Gtk.Widget
): Gio.FileMonitor | null {
    try {
        const file = Gio.File.new_for_path(path);
        const parent = file.get_parent();
        if (parent) {
            try {
                parent.make_directory_with_parents(null);
            } catch (e: any) {
                if (!e.message?.includes("File exists")) {
                    console.error("Failed to create directory:", e);
                }
            }
        }
        const monitor = file.monitor(Gio.FileMonitorFlags.NONE, null);
        monitor.connect("changed", (_monitor, _file, _otherFile, eventType) => {
            if (eventType === Gio.FileMonitorEvent.CHANGES_DONE_HINT) {
                onChange();
            }
        });
        // Attach to owner to avoid GC
        (owner as any)[`__monitor_${path.replace(/\//g, "_")}`] = monitor;
        return monitor;
    } catch (err) {
        console.error("Failed to set up monitor for", path, err);
        return null;
    }
}