import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../../core/theme/app_color_scheme.dart';
import '../../core/theme/app_spacing.dart';
import '../../core/theme/app_theme.dart';
import '../../core/theme/app_theme_extension.dart';

/// Material Design 3 风格的输入框组件
/// 
/// 特点：
/// - 圆角外边框（OutlineInputBorder）
/// - Focus 时边框颜色变化
/// - 标签上浮动画
/// - 统一的视觉效果
class MaterialInput extends StatelessWidget {
  final TextEditingController? controller;
  final String? labelText;
  final String? hintText;
  final IconData? prefixIcon;
  final Widget? suffixIcon;
  final bool obscureText;
  final TextInputType? keyboardType;
  final int? maxLines;
  final int? maxLength;
  final bool enabled;
  final bool readOnly;
  final String? Function(String?)? validator;
  final ValueChanged<String>? onChanged;
  final VoidCallback? onTap;
  final ValueChanged<String>? onSubmitted;
  final List<TextInputFormatter>? inputFormatters;
  final FocusNode? focusNode;

  const MaterialInput({
    super.key,
    this.controller,
    this.labelText,
    this.hintText,
    this.prefixIcon,
    this.suffixIcon,
    this.obscureText = false,
    this.keyboardType,
    this.maxLines = 1,
    this.maxLength,
    this.enabled = true,
    this.readOnly = false,
    this.validator,
    this.onChanged,
    this.onTap,
    this.onSubmitted,
    this.inputFormatters,
    this.focusNode,
  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final isDark = Theme.of(context).brightness == Brightness.dark;

    // Material Design 3 的颜色
    final primaryColor = isDark ? AppColorScheme.up : colorScheme.primary;
    final borderColor = isDark 
        ? AppColorScheme.darkOutline.withValues(alpha: 0.3)
        : colorScheme.outline.withValues(alpha: 0.5);
    final fillColor = isDark 
        ? AppColorScheme.darkSurfaceContainerHigh.withValues(alpha: 0.3)
        : colorScheme.surfaceContainerHighest.withValues(alpha: 0.5);

    return TextFormField(
      controller: controller,
      focusNode: focusNode,
      obscureText: obscureText,
      keyboardType: keyboardType,
      maxLines: maxLines,
      maxLength: maxLength,
      enabled: enabled,
      readOnly: readOnly,
      validator: validator,
      onChanged: onChanged,
      onTap: onTap,
      onFieldSubmitted: onSubmitted,
      inputFormatters: inputFormatters,
      style: AppTextStyles.headlineMedium(context).copyWith(
        color: enabled 
            ? colorScheme.onSurface 
            : colorScheme.onSurface.withValues(alpha: 0.5),
      ),
      cursorColor: primaryColor,
      cursorWidth: 2.0,
      cursorHeight: 20,
      decoration: InputDecoration(
        // 标签（Material Design 3 的浮动标签）
        labelText: labelText,
        labelStyle: AppTextStyles.bodyLarge(context).copyWith(
          color: colorScheme.onSurfaceVariant,
        ),
        floatingLabelStyle: AppTextStyles.bodyMedium(context).copyWith(
          color: primaryColor,
          fontWeight: FontWeight.w600,
        ),
        
        // 提示文本
        hintText: hintText,
        hintStyle: AppTextStyles.bodyLarge(context).copyWith(
          color: colorScheme.onSurfaceVariant.withValues(alpha: 0.6),
        ),
        
        // 前置图标
        prefixIcon: prefixIcon != null
            ? Icon(
                prefixIcon,
                color: colorScheme.onSurfaceVariant,
                size: 22,
              )
            : null,
        prefixIconColor: WidgetStateColor.resolveWith((states) {
          if (states.contains(WidgetState.focused)) {
            return primaryColor;
          }
          return colorScheme.onSurfaceVariant;
        }),
        
        // 后置图标
        suffixIcon: suffixIcon,
        
        // 填充颜色
        filled: true,
        fillColor: fillColor,
        
        // 内容内边距
        contentPadding: const EdgeInsets.symmetric(
          horizontal: AppSpacing.lg,
          vertical: AppSpacing.md,
        ),
        
        // Material Design 3 边框样式
        border: _buildBorder(borderColor, AppRadius.lg),
        enabledBorder: _buildBorder(borderColor, AppRadius.lg),
        focusedBorder: _buildBorder(primaryColor, AppRadius.lg, width: 2.0),
        errorBorder: _buildBorder(colorScheme.error, AppRadius.lg),
        focusedErrorBorder: _buildBorder(colorScheme.error, AppRadius.lg, width: 2.0),
        disabledBorder: _buildBorder(
          borderColor.withValues(alpha: 0.3),
          AppRadius.lg,
        ),
        
        // 错误文本样式
        errorStyle: AppTextStyles.bodySmall(context).copyWith(
          color: colorScheme.error,
        ),
        
        // 计数器样式
        counterStyle: AppTextStyles.bodySmall(context).copyWith(
          color: colorScheme.onSurfaceVariant,
        ),
      ),
    );
  }

  OutlineInputBorder _buildBorder(Color color, double radius, {double width = 1.0}) {
    return OutlineInputBorder(
      borderRadius: BorderRadius.circular(radius),
      borderSide: BorderSide(
        color: color,
        width: width,
      ),
    );
  }
}

/// Material Design 3 风格的密码输入框（带显示/隐藏切换）
class MaterialPasswordInput extends StatefulWidget {
  final TextEditingController? controller;
  final String? labelText;
  final String? hintText;
  final IconData? prefixIcon;
  final String? Function(String?)? validator;
  final ValueChanged<String>? onChanged;
  final ValueChanged<String>? onSubmitted;
  final FocusNode? focusNode;

  const MaterialPasswordInput({
    super.key,
    this.controller,
    this.labelText,
    this.hintText,
    this.prefixIcon,
    this.validator,
    this.onChanged,
    this.onSubmitted,
    this.focusNode,
  });

  @override
  State<MaterialPasswordInput> createState() => _MaterialPasswordInputState();
}

class _MaterialPasswordInputState extends State<MaterialPasswordInput> {
  bool _obscureText = true;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    
    return MaterialInput(
      controller: widget.controller,
      labelText: widget.labelText,
      hintText: widget.hintText,
      prefixIcon: widget.prefixIcon ?? Icons.lock_outline,
      obscureText: _obscureText,
      validator: widget.validator,
      onChanged: widget.onChanged,
      onSubmitted: widget.onSubmitted,
      focusNode: widget.focusNode,
      suffixIcon: IconButton(
        icon: Icon(
          _obscureText ? Icons.visibility_off : Icons.visibility,
          color: colorScheme.onSurfaceVariant,
          size: 22,
        ),
        onPressed: () {
          setState(() {
            _obscureText = !_obscureText;
          });
        },
        splashRadius: 20,
      ),
    );
  }
}