oott/frontend/lib/widgets/empty_state.dart

import 'package:flutter/material.dart';

import '../theme/dimens.dart';

/// A centered placeholder for "nothing here yet" situations: an icon, a short
/// message and an optional call-to-action button. Keeps empty screens
/// consistent and gives the user a next step instead of a bare line of text.
class EmptyState extends StatelessWidget {
  const EmptyState({
    required this.icon,
    required this.message,
    this.actionLabel,
    this.onAction,
    super.key,
  });

  final IconData icon;
  final String message;
  final String? actionLabel;
  final VoidCallback? onAction;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final hasAction = actionLabel != null && onAction != null;

    return Center(
      child: Padding(
        padding: const EdgeInsets.all(Insets.xxl),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(icon, size: 48, color: theme.colorScheme.onSurfaceVariant),
            const SizedBox(height: Insets.md),
            Text(
              message,
              textAlign: TextAlign.center,
              style: theme.textTheme.bodyLarge?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
            if (hasAction) ...[
              const SizedBox(height: Insets.lg),
              OutlinedButton(onPressed: onAction, child: Text(actionLabel!)),
            ],
          ],
        ),
      ),
    );
  }
}