import 'package:flutter/material.dart';
import '../core/app_colors.dart';

/// 渐变边框按钮（白色底+彩色渐变边框）
class GradientBorderButton extends StatelessWidget {
  final String text;
  final IconData? icon;
  final VoidCallback? onTap;
  final double height;
  final bool isSuccess;

  const GradientBorderButton({
    super.key,
    required this.text,
    this.icon,
    this.onTap,
    this.height = 52,
    this.isSuccess = false,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      height: height,
      decoration: BoxDecoration(
        gradient: isSuccess
            ? AppColors.calmHealthGradient
            : AppColors.primaryGradient,
        borderRadius: BorderRadius.circular(14),
        boxShadow: AppColors.buttonShadow,
      ),
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(14),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              if (icon != null) ...[
                Icon(icon, size: 22, color: AppColors.textOnGradient),
                const SizedBox(width: 8),
              ],
              Text(
                text,
                style: const TextStyle(
                  fontSize: 17,
                  fontWeight: FontWeight.w600,
                  color: AppColors.textOnGradient,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

/// 卡片内的小操作按钮
class CardActionButton extends StatelessWidget {
  final String label;
  final IconData icon;
  final VoidCallback? onTap;
  final Color? iconColor;

  const CardActionButton({
    super.key,
    required this.label,
    required this.icon,
    this.onTap,
    this.iconColor,
  });

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(12),
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
        decoration: BoxDecoration(
          gradient: AppColors.surfaceGradient,
          borderRadius: BorderRadius.circular(12),
          border: Border.all(color: AppColors.borderLight),
          boxShadow: AppColors.cardShadowLight,
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(icon, size: 18, color: iconColor ?? AppColors.primary),
            const SizedBox(width: 6),
            Text(
              label,
              style: TextStyle(
                fontSize: 14,
                fontWeight: FontWeight.w500,
                color: AppColors.textPrimary,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

/// 滑动删除组件：左滑露出红色删除背景，达30%阈值锁定，点击确认删除
/// [margin] 控制卡片之间的间距，red背景与child完全对齐
class SwipeDeleteTile extends StatefulWidget {
  final Widget child;
  final VoidCallback onDelete;
  final VoidCallback? onTap;
  final EdgeInsetsGeometry margin;
  const SwipeDeleteTile({
    super.key,
    required this.child,
    required this.onDelete,
    this.onTap,
    this.margin = const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
  });
  @override
  State<SwipeDeleteTile> createState() => _SwipeDeleteTileState();
}

class _SwipeDeleteTileState extends State<SwipeDeleteTile>
    with SingleTickerProviderStateMixin {
  double _dx = 0;
  static const _maxSlide = 80.0;
  static const _threshold = 24.0; // 30% of 80

  void _onDragUpdate(DragUpdateDetails d) {
    setState(() => _dx = (_dx + d.delta.dx).clamp(-_maxSlide, 0.0));
  }

  void _onDragEnd(DragEndDetails d) {
    if (_dx < -_threshold) {
      setState(() => _dx = -_maxSlide);
    } else {
      setState(() => _dx = 0);
    }
  }

  @override
  Widget build(BuildContext context) {
    final isSwiped = _dx < 0;
    return Padding(
      padding: widget.margin,
      child: Stack(
        children: [
          Positioned.fill(
            child: Container(
              decoration: BoxDecoration(
                color: AppColors.error,
                borderRadius: BorderRadius.circular(16),
              ),
              child: const Align(
                alignment: Alignment.centerRight,
                child: Padding(
                  padding: EdgeInsets.only(right: 20),
                  child: Icon(
                    Icons.delete_outline,
                    color: AppColors.textOnGradient,
                    size: 28,
                  ),
                ),
              ),
            ),
          ),
          GestureDetector(
            behavior: isSwiped
                ? HitTestBehavior.opaque
                : HitTestBehavior.deferToChild,
            onTap: isSwiped
                ? () {
                    widget.onDelete();
                    setState(() => _dx = 0);
                  }
                : widget.onTap,
            onHorizontalDragUpdate: _onDragUpdate,
            onHorizontalDragEnd: _onDragEnd,
            child: Transform.translate(
              offset: Offset(_dx, 0),
              child: isSwiped
                  ? AbsorbPointer(absorbing: true, child: widget.child)
                  : widget.child,
            ),
          ),
        ],
      ),
    );
  }
}

/// 功能区小图标容器
class IconBox extends StatelessWidget {
  final IconData icon;
  final double size;
  final Color? backgroundColor;
  final Color? iconColor;

  const IconBox({
    super.key,
    required this.icon,
    this.size = 44,
    this.backgroundColor,
    this.iconColor,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      width: size,
      height: size,
      decoration: BoxDecoration(
        gradient: backgroundColor == null ? AppColors.calmHealthGradient : null,
        color: backgroundColor,
        borderRadius: BorderRadius.circular(size / 3),
        boxShadow: AppColors.cardShadowLight,
      ),
      child: Icon(icon, size: size * 0.55, color: iconColor ?? Colors.white),
    );
  }
}