import 'package:flutter/material.dart';
import '../constants/app_constants.dart';

// 自定义按钮组件
class CustomButton extends StatelessWidget {
  final String text;
  final VoidCallback? onPressed;
  final IconData? icon;
  final Color? backgroundColor;
  final Color? textColor;
  final double? borderRadius;
  final bool isLoading;
  final double? width;
  final double? height;

  const CustomButton({
    super.key,
    required this.text,
    this.onPressed,
    this.icon,
    this.backgroundColor,
    this.textColor,
    this.borderRadius,
    this.isLoading = false,
    this.width,
    this.height,
  });

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: width,
      height: height ?? 48,
      child: ElevatedButton(
        onPressed: isLoading ? null : onPressed,
        style: ElevatedButton.styleFrom(
          backgroundColor: backgroundColor ?? AppConstants.primaryColor,
          foregroundColor: textColor ?? Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(borderRadius ?? 8),
          ),
          elevation: 2,
        ),
        child: isLoading
            ? const SizedBox(
                width: 20,
                height: 20,
                child: CircularProgressIndicator(
                  strokeWidth: 2,
                  valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
                ),
              )
            : Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  if (icon != null) ...[
                    Icon(icon, size: 18),
                    const SizedBox(width: 8),
                  ],
                  Text(text),
                ],
              ),
      ),
    );
  }
}

// 自定义卡片组件
class CustomCard extends StatelessWidget {
  final Widget child;
  final EdgeInsetsGeometry? padding;
  final EdgeInsetsGeometry? margin;
  final double? borderRadius;
  final Color? backgroundColor;
  final VoidCallback? onTap;
  final BoxBorder? border;

  const CustomCard({
    super.key,
    required this.child,
    this.padding,
    this.margin,
    this.borderRadius,
    this.backgroundColor,
    this.onTap,
    this.border,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: margin ?? const EdgeInsets.all(8),
      child: Material(
        color: backgroundColor ?? AppConstants.surfaceColor,
        borderRadius: BorderRadius.circular(borderRadius ?? 12),
        elevation: 2,
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(borderRadius ?? 12),
          child: Container(
            padding: padding ?? const EdgeInsets.all(16),
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(borderRadius ?? 12),
              border: border,
            ),
            child: child,
          ),
        ),
      ),
    );
  }
}

// 自定义输入框组件
class CustomTextField extends StatelessWidget {
  final String? labelText;
  final String? hintText;
  final TextEditingController? controller;
  final IconData? prefixIcon;
  final IconData? suffixIcon;
  final VoidCallback? onSuffixIconTap;
  final bool obscureText;
  final String? Function(String?)? validator;
  final void Function(String)? onChanged;
  final TextInputType? keyboardType;
  final int? maxLines;
  final bool enabled;

  const CustomTextField({
    super.key,
    this.labelText,
    this.hintText,
    this.controller,
    this.prefixIcon,
    this.suffixIcon,
    this.onSuffixIconTap,
    this.obscureText = false,
    this.validator,
    this.onChanged,
    this.keyboardType,
    this.maxLines = 1,
    this.enabled = true,
  });

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      controller: controller,
      obscureText: obscureText,
      validator: validator,
      onChanged: onChanged,
      keyboardType: keyboardType,
      maxLines: maxLines,
      enabled: enabled,
      decoration: InputDecoration(
        labelText: labelText,
        hintText: hintText,
        prefixIcon: prefixIcon != null ? Icon(prefixIcon) : null,
        suffixIcon: suffixIcon != null
            ? IconButton(
                icon: Icon(suffixIcon),
                onPressed: onSuffixIconTap,
              )
            : null,
      ),
    );
  }
}

// 加载指示器组件
class LoadingIndicator extends StatelessWidget {
  final String? message;
  final Color? color;

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

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          CircularProgressIndicator(
            valueColor: AlwaysStoppedAnimation<Color>(
              color ?? AppConstants.primaryColor,
            ),
          ),
          if (message != null) ...[
            const SizedBox(height: 16),
            Text(
              message!,
              style: const TextStyle(
                fontSize: 14,
                color: Colors.grey,
              ),
            ),
          ],
        ],
      ),
    );
  }
}

// 空状态组件
class EmptyState extends StatelessWidget {
  final String title;
  final String? subtitle;
  final IconData? icon;
  final Widget? action;

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

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              icon ?? Icons.inbox_outlined,
              size: 64,
              color: Colors.grey[400],
            ),
            const SizedBox(height: 16),
            Text(
              title,
              style: const TextStyle(
                fontSize: 18,
                fontWeight: FontWeight.w500,
                color: Colors.black87,
              ),
              textAlign: TextAlign.center,
            ),
            if (subtitle != null) ...[
              const SizedBox(height: 8),
              Text(
                subtitle!,
                style: const TextStyle(
                  fontSize: 14,
                  color: Colors.grey,
                ),
                textAlign: TextAlign.center,
              ),
            ],
            if (action != null) ...[
              const SizedBox(height: 24),
              action!,
            ],
          ],
        ),
      ),
    );
  }
}

// 错误状态组件
class ErrorState extends StatelessWidget {
  final String title;
  final String? subtitle;
  final VoidCallback? onRetry;

  const ErrorState({
    super.key,
    required this.title,
    this.subtitle,
    this.onRetry,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              Icons.error_outline,
              size: 64,
              color: AppConstants.errorColor,
            ),
            const SizedBox(height: 16),
            Text(
              title,
              style: const TextStyle(
                fontSize: 18,
                fontWeight: FontWeight.w500,
                color: Colors.black87,
              ),
              textAlign: TextAlign.center,
            ),
            if (subtitle != null) ...[
              const SizedBox(height: 8),
              Text(
                subtitle!,
                style: const TextStyle(
                  fontSize: 14,
                  color: Colors.grey,
                ),
                textAlign: TextAlign.center,
              ),
            ],
            if (onRetry != null) ...[
              const SizedBox(height: 24),
              CustomButton(
                text: AppConstants.retryText,
                onPressed: onRetry,
                icon: AppConstants.refreshIcon,
              ),
            ],
          ],
        ),
      ),
    );
  }
}