import 'package:flutter/material.dart';

/// Карточка статистики
class StatCard extends StatelessWidget {
  final String title;
  final String value;
  final IconData icon;
  final Color? color;
  final VoidCallback? onTap;

  const StatCard({
    super.key,
    required this.title,
    required this.value,
    required this.icon,
    this.color,
    this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        padding: const EdgeInsets.all(16),
        decoration: BoxDecoration(
          color: Theme.of(context).cardColor,
          borderRadius: BorderRadius.circular(12),
          boxShadow: [
            BoxShadow(
              color: Colors.black.withOpacity(0.05),
              blurRadius: 8,
              offset: const Offset(0, 2),
            ),
          ],
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Icon(icon, color: color ?? Colors.blue),
            const SizedBox(height: 12),
            Text(
              value,
              style: TextStyle(
                fontSize: 24,
                fontWeight: FontWeight.bold,
                color: color ?? Colors.blue,
              ),
            ),
            const SizedBox(height: 4),
            Text(
              title,
              style: TextStyle(
                color: Colors.grey[600],
                fontSize: 12,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

/// Пустое состояние
class EmptyState extends StatelessWidget {
  final IconData icon;
  final String title;
  final String subtitle;
  final Widget? action;

  const EmptyState({
    super.key,
    required this.icon,
    required this.title,
    required this.subtitle,
    this.action,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(icon, size: 80, color: Colors.grey[400]),
          const SizedBox(height: 16),
          Text(
            title,
            style: TextStyle(
              fontSize: 20,
              fontWeight: FontWeight.bold,
              color: Colors.grey[600],
            ),
          ),
          const SizedBox(height: 8),
          Text(
            subtitle,
            textAlign: TextAlign.center,
            style: TextStyle(color: Colors.grey[500]),
          ),
          if (action != null) ...[
            const SizedBox(height: 24),
            action!,
          ],
        ],
      ),
    );
  }
}

/// Загрузочный экран
class LoadingScreen extends StatelessWidget {
  final String? message;

  const LoadingScreen({super.key, this.message});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const CircularProgressIndicator(),
          if (message != null) ...[
            const SizedBox(height: 16),
            Text(
              message!,
              style: TextStyle(color: Colors.grey[600]),
            ),
          ],
        ],
      ),
    );
  }
}

/// Экран ошибки
class ErrorScreen extends StatelessWidget {
  final String message;
  final VoidCallback? onRetry;

  const ErrorScreen({
    super.key,
    required this.message,
    this.onRetry,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const Icon(Icons.error_outline, size: 64, color: Colors.red),
          const SizedBox(height: 16),
          Text(
            'Ошибка',
            style: Theme.of(context).textTheme.titleLarge,
          ),
          const SizedBox(height: 8),
          Text(
            message,
            textAlign: TextAlign.center,
            style: TextStyle(color: Colors.grey[600]),
          ),
          if (onRetry != null) ...[
            const SizedBox(height: 24),
            ElevatedButton.icon(
              onPressed: onRetry,
              icon: const Icon(Icons.refresh),
              label: const Text('Повторить'),
            ),
          ],
        ],
      ),
    );
  }
}