import 'package:flutter/material.dart';
import 'package:patbond_flutter/core/network/signed_network_image.dart';
import 'package:patbond_flutter/core/theme/app_theme.dart';

class RemoteImage extends StatelessWidget {
  const RemoteImage({
    required this.url,
    super.key,
    this.width,
    this.height,
    this.fit = BoxFit.cover,
    this.borderRadius = BorderRadius.zero,
  });

  final String url;
  final double? width;
  final double? height;
  final BoxFit fit;
  final BorderRadius borderRadius;

  @override
  Widget build(BuildContext context) {
    return ClipRRect(
      borderRadius: borderRadius,
      // 缓存 key 剥离预签名参数（T3-14）：媒体 URL 每次响应现签，
      // 按完整 URL 缓存会同图重复下载。
      child: Image(
        image: SignedNetworkImage(url),
        width: width,
        height: height,
        fit: fit,
        loadingBuilder: (context, child, progress) {
          if (progress == null) return child;
          return ColoredBox(
            color: AppColors.surfaceTint,
            child: SizedBox(
              width: width,
              height: height,
              child: const Center(
                child: CircularProgressIndicator(strokeWidth: 2),
              ),
            ),
          );
        },
        errorBuilder: (context, error, stackTrace) {
          return ColoredBox(
            color: AppColors.surfaceTint,
            child: SizedBox(
              width: width,
              height: height,
              child: const Center(
                child: Icon(Icons.pets, color: AppColors.muted, size: 34),
              ),
            ),
          );
        },
      ),
    );
  }
}

class SectionCard extends StatelessWidget {
  const SectionCard({required this.child, super.key, this.padding});

  final Widget child;
  final EdgeInsetsGeometry? padding;

  @override
  Widget build(BuildContext context) {
    return Card(
      child: Padding(
        padding: padding ?? const EdgeInsets.all(18),
        child: child,
      ),
    );
  }
}

/// 胶囊标签：底色为 [color] 的 8% 淡染（`withAlpha(20)`），文字用深变体。
///
/// DEBT-1 偿还（05 号规范 §5.3）：原实现文字直接用 [color]，在自身淡底
/// 上仅 1.67–2.55:1 不达 WCAG AA；现文字色按内置映射取深变体
/// （primary→primaryDark 8.74:1、success→successInk 7.39:1、
/// accent→accentDark 7.07:1、error→errorDark 5.78:1、未命中→ink 兜底），
/// 或经 [inkColor] 显式指定。既有调用零参数变更、仅视觉变深。
class TagPill extends StatelessWidget {
  const TagPill(
    this.label, {
    super.key,
    this.color = AppColors.primary,
    this.inkColor,
  });

  final String label;

  /// 底色基色（淡染 8% 后作背景）。
  final Color color;

  /// 文字色；缺省按 [color] 查内置深变体映射。
  final Color? inkColor;

  /// 内置深变体映射（Color 重载 == 不能作 const map 键，用查表函数）。
  static Color _defaultInkFor(Color color) {
    if (color == AppColors.primary) return AppColors.primaryDark;
    if (color == AppColors.success) return AppColors.successInk;
    if (color == AppColors.accent) return AppColors.accentDark;
    if (color == AppColors.error) return AppColors.errorDark;
    return AppColors.ink;
  }

  @override
  Widget build(BuildContext context) {
    final effectiveInk = inkColor ?? _defaultInkFor(color);
    return DecoratedBox(
      decoration: BoxDecoration(
        color: color.withAlpha(20),
        borderRadius: BorderRadius.circular(99),
      ),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
        child: Text(
          label,
          style: TextStyle(
            color: effectiveInk,
            fontSize: 11,
            fontWeight: FontWeight.w700,
          ),
        ),
      ),
    );
  }
}

class EmptyState extends StatelessWidget {
  const EmptyState({required this.message, super.key});

  final String message;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 48),
      child: Column(
        children: [
          const Icon(
            Icons.search_off_rounded,
            size: 42,
            color: AppColors.muted,
          ),
          const SizedBox(height: 12),
          Text(message, style: Theme.of(context).textTheme.bodySmall),
        ],
      ),
    );
  }
}