import 'package:flutter/cupertino.dart';
import 'package:please_pay_me/theme/tokens.dart';
import 'package:please_pay_me/ui/atoms/app_button.dart';
import 'package:please_pay_me/ui/atoms/app_icon.dart';
import 'package:please_pay_me/ui/atoms/app_text.dart';
import 'package:please_pay_me/ui/feedback/app_progress.dart';

/// Centered placeholder for empty collections.
class AppEmptyState extends StatelessWidget {
  const AppEmptyState({
    super.key,
    required this.title,
    this.message,
    this.icon = CupertinoIcons.tray,
    this.actionLabel,
    this.onAction,
  });

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

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(
        horizontal: AppSpacing.s6,
        vertical: AppSpacing.s7,
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          AppIcon(icon, size: 44, color: AppColors.tertiaryLabel),
          const SizedBox(height: AppSpacing.s3),
          AppText.headline(title, textAlign: TextAlign.center),
          if (message != null) ...[
            const SizedBox(height: AppSpacing.s1),
            AppText.subhead(message!, textAlign: TextAlign.center),
          ],
          if (actionLabel != null && onAction != null) ...[
            const SizedBox(height: AppSpacing.s4),
            AppButton(
              label: actionLabel!,
              size: AppButtonSize.medium,
              style: AppButtonStyle.tinted,
              expanded: false,
              onPressed: onAction,
            ),
          ],
        ],
      ),
    );
  }
}

/// Failure placeholder with a retry affordance.
class AppErrorView extends StatelessWidget {
  const AppErrorView({super.key, required this.message, this.onRetry});

  final String message;
  final VoidCallback? onRetry;

  @override
  Widget build(BuildContext context) {
    return AppEmptyState(
      icon: CupertinoIcons.exclamationmark_triangle,
      title: 'Не получилось загрузить',
      message: message,
      actionLabel: onRetry == null ? null : 'Повторить',
      onAction: onRetry,
    );
  }
}

class AppLoadingView extends StatelessWidget {
  const AppLoadingView({super.key});

  @override
  Widget build(BuildContext context) {
    return const Padding(
      padding: EdgeInsets.symmetric(vertical: AppSpacing.s7),
      child: Center(child: AppSpinner()),
    );
  }
}