import 'package:flutter/material.dart';

/// Shows a snackbar-style message at the top of the screen (for success/neutral feedback).
void showTopSnackBar(
  BuildContext context, {
  required String message,
  Color? backgroundColor,
  Duration duration = const Duration(seconds: 2),
}) {
  final overlay = Overlay.of(context);
  final theme = Theme.of(context);
  final color = backgroundColor ?? theme.colorScheme.surfaceContainerHighest;
  final textColor = backgroundColor != null ? Colors.white : theme.colorScheme.onSurface;

  late OverlayEntry entry;
  entry = OverlayEntry(
    builder: (context) => Positioned(
      top: 0,
      left: 0,
      right: 0,
      child: SafeArea(
        child: Padding(
          padding: const EdgeInsets.fromLTRB(16, 8, 16, 0),
          child: Material(
            color: color,
            elevation: 4,
            borderRadius: BorderRadius.circular(8),
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
              child: Text(
                message,
                style: theme.textTheme.bodyLarge?.copyWith(color: textColor),
              ),
            ),
          ),
        ),
      ),
    ),
  );

  overlay.insert(entry);
  Future.delayed(duration, () {
    entry.remove();
  });
}