import 'package:flutter/material.dart';

/// 加载态
class LoadingView extends StatelessWidget {
  const LoadingView({super.key, this.tip = '加载中...', this.padding = const EdgeInsets.all(40)});

  final String tip;
  final EdgeInsetsGeometry padding;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: padding,
      child: Column(
        children: [
          const SizedBox(
            width: 26,
            height: 26,
            child: CircularProgressIndicator(strokeWidth: 2.5, color: Color(0xFFC8956E)),
          ),
          const SizedBox(height: 12),
          Text(tip, style: const TextStyle(fontSize: 13, color: Color(0xFF8D6E63))),
        ],
      ),
    );
  }
}

/// 错误态（可带重试）
class ErrorView extends StatelessWidget {
  const ErrorView({super.key, required this.message, this.onRetry});

  final String message;
  final VoidCallback? onRetry;

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.white.withValues(alpha: 0.85),
        borderRadius: BorderRadius.circular(14),
      ),
      child: Column(
        children: [
          const Text('😵', style: TextStyle(fontSize: 30)),
          const SizedBox(height: 8),
          Text(
            message,
            textAlign: TextAlign.center,
            style: const TextStyle(fontSize: 13, color: Color(0xFF8D6E63)),
          ),
          if (onRetry != null) ...[
            const SizedBox(height: 12),
            OutlinedButton(
              onPressed: onRetry,
              style: OutlinedButton.styleFrom(
                foregroundColor: const Color(0xFFC8956E),
                side: const BorderSide(color: Color(0xFFC8956E)),
                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18)),
              ),
              child: const Text('重试'),
            ),
          ],
        ],
      ),
    );
  }
}

/// 空状态
class EmptyView extends StatelessWidget {
  const EmptyView({
    super.key,
    this.icon = '📭',
    required this.title,
    this.tip,
    this.padding = const EdgeInsets.symmetric(vertical: 40),
  });

  final String icon;
  final String title;
  final String? tip;
  final EdgeInsetsGeometry padding;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: padding,
      child: Column(
        children: [
          Text(icon, style: const TextStyle(fontSize: 44)),
          const SizedBox(height: 10),
          Text(title, style: const TextStyle(fontSize: 15, color: Color(0xFF5D4037))),
          if (tip != null) ...[
            const SizedBox(height: 6),
            Text(
              tip!,
              textAlign: TextAlign.center,
              style: const TextStyle(fontSize: 12.5, color: Color(0xFFBCAAA4)),
            ),
          ],
        ],
      ),
    );
  }
}