// widgets/ds/ds_atoms.dart
// Flutter 组件库（ds=design-system）——一对一镜像原型 atoms.css 的原子。
// 单一组件源：尺寸/间距/圆角/字号全引 AppDims，颜色全引 context.tokens（禁硬编码）。
// 屏只组合这些组件，不再自己堆样式（见代码端真相源闸 check_ds_code）。
import 'package:flutter/material.dart';
import '../../core/theme/context_tokens.dart';
import '../../core/theme/app_dims.g.dart';

// ── .btn ──────────────────────────────────────────────────────────────────
enum DsBtnVariant { ghost, primary, danger }

/// 原型 .btn：h38 / pad 0 16 / r-md / fs-body / fw600 / gap7，图标 16。
/// ghost=surface+border / primary=primary+on-primary / danger=danger+白。
class DsButton extends StatelessWidget {
  final String label;
  final IconData? icon;
  final VoidCallback? onPressed;
  final DsBtnVariant variant;
  final bool small; // .btn.sm：h32 / pad 0 12 / fs-sm

  const DsButton(
    this.label, {
    super.key,
    this.icon,
    this.onPressed,
    this.variant = DsBtnVariant.ghost,
    this.small = false,
  });

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    final (bg, fg, border) = switch (variant) {
      DsBtnVariant.ghost => (t.surface, t.text, t.border),
      DsBtnVariant.primary => (t.primary, t.onPrimary, t.primary),
      DsBtnVariant.danger => (t.danger, t.onPrimary, t.danger),
    };
    return Material(
      color: bg,
      borderRadius: BorderRadius.circular(AppDims.rMd),
      child: InkWell(
        onTap: onPressed,
        borderRadius: BorderRadius.circular(AppDims.rMd),
        child: Container(
          height: small ? 32 : 38,
          padding: EdgeInsets.symmetric(horizontal: small ? 12 : 16),
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(AppDims.rMd),
            border: Border.all(color: border),
          ),
          child: Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              if (icon != null) ...[
                Icon(icon, size: 16, color: fg),
                const SizedBox(width: 7),
              ],
              Text(label,
                  style: TextStyle(
                      color: fg,
                      fontSize: small ? AppDims.fsSm : AppDims.fsBody,
                      fontWeight: FontWeight.w600)),
            ],
          ),
        ),
      ),
    );
  }
}

// ── .badge ────────────────────────────────────────────────────────────────
enum DsBadgeTone { ok, danger, warn, info, accent, muted }

/// 原型 .badge：h22 / pad 0 9 / r-pill / fs-sm fw600 + 前导圆点(6px, currentColor)。
class DsBadge extends StatelessWidget {
  final String label;
  final DsBadgeTone tone;
  const DsBadge(this.label, {super.key, this.tone = DsBadgeTone.ok});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    final (bg, fg) = switch (tone) {
      DsBadgeTone.ok => (t.successBg, t.success),
      DsBadgeTone.danger => (t.dangerBg, t.danger),
      DsBadgeTone.warn => (t.warnBg, t.warn),
      DsBadgeTone.info => (t.infoSoft, t.primary),
      DsBadgeTone.accent => (t.accentSoft, t.accent),
      DsBadgeTone.muted => (t.borderSubtle, t.muted),
    };
    return Container(
      height: 22,
      padding: const EdgeInsets.symmetric(horizontal: 9),
      decoration:
          BoxDecoration(color: bg, borderRadius: BorderRadius.circular(AppDims.rPill)),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Container(
              width: 6,
              height: 6,
              decoration: BoxDecoration(color: fg, shape: BoxShape.circle)),
          const SizedBox(width: 5),
          Text(label,
              style: TextStyle(
                  color: fg,
                  fontSize: AppDims.fsSm,
                  fontWeight: FontWeight.w600)),
        ],
      ),
    );
  }
}

// ── .chip ─────────────────────────────────────────────────────────────────
/// 原型 .chip：h34 / pad 0 12 / border r-md / surface / fs-sm / gap7。
/// 选中值用 .cv（primary fw600）；激活(on)边框 primary。配 PopupMenuButton 用。
class DsChip extends StatelessWidget {
  final String label;
  final String? value; // 选中值（.cv）；非空即 on 态
  final VoidCallback? onTap;
  final VoidCallback? onClear; // 选中态下点 × 单独清除该筛选（不触发展开菜单）
  const DsChip(
      {super.key,
      required this.label,
      this.value,
      this.onTap,
      this.onClear});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    final on = value != null && value!.isNotEmpty;
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(AppDims.rMd),
      child: Container(
        height: 34,
        padding: const EdgeInsets.symmetric(horizontal: 12),
        decoration: BoxDecoration(
          color: t.surface,
          border: Border.all(color: on ? t.primary : t.border),
          borderRadius: BorderRadius.circular(AppDims.rMd),
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(label,
                style: TextStyle(fontSize: AppDims.fsSm, color: t.text)),
            if (on) ...[
              const SizedBox(width: 7),
              Text(value!,
                  style: TextStyle(
                      fontSize: AppDims.fsSm,
                      color: t.primary,
                      fontWeight: FontWeight.w600)),
            ],
            const SizedBox(width: 7),
            // 选中且提供 onClear → 展示可点 ×（清该筛选）；否则展示下拉箭头。
            if (on && onClear != null)
              GestureDetector(
                behavior: HitTestBehavior.opaque,
                onTap: onClear,
                child: Icon(Icons.close, size: 14, color: t.muted),
              )
            else
              Icon(Icons.keyboard_arrow_down, size: 14, color: t.faint),
          ],
        ),
      ),
    );
  }
}

// ── .searchbox ──────────────────────────────────────────────────────────────
/// 原型 .searchbox：h34 / bg / border r-md / gap8 / pad 0 11，前导放大镜 14(faint)。
class DsSearchBox extends StatelessWidget {
  final TextEditingController? controller;
  final String hint;
  final ValueChanged<String>? onChanged;
  final ValueChanged<String>? onSubmitted;
  final double? width;
  const DsSearchBox({
    super.key,
    this.controller,
    this.hint = '',
    this.onChanged,
    this.onSubmitted,
    this.width,
  });

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return SizedBox(
      width: width,
      height: 34,
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 11),
        decoration: BoxDecoration(
          color: t.bg,
          border: Border.all(color: t.border),
          borderRadius: BorderRadius.circular(AppDims.rMd),
        ),
        child: Row(
          children: [
            Icon(Icons.search, size: 14, color: t.faint),
            const SizedBox(width: 8),
            Expanded(
              child: TextField(
                controller: controller,
                onChanged: onChanged,
                onSubmitted: onSubmitted,
                style: TextStyle(fontSize: AppDims.fsBody, color: t.text),
                decoration: InputDecoration(
                  isCollapsed: true,
                  border: InputBorder.none,
                  hintText: hint,
                  hintStyle:
                      TextStyle(fontSize: AppDims.fsBody, color: t.faint),
                ),
              ),
            ),
            // 有输入时显示 × 清除（清空并触发一次空关键词搜索）。
            if (controller != null)
              ValueListenableBuilder<TextEditingValue>(
                valueListenable: controller!,
                builder: (context, value, _) {
                  if (value.text.isEmpty) return const SizedBox.shrink();
                  return GestureDetector(
                    behavior: HitTestBehavior.opaque,
                    onTap: () {
                      controller!.clear();
                      onChanged?.call('');
                      onSubmitted?.call('');
                    },
                    child: Padding(
                      padding: const EdgeInsets.only(left: 6),
                      child: Icon(Icons.close, size: 14, color: t.muted),
                    ),
                  );
                },
              ),
          ],
        ),
      ),
    );
  }
}

/// 加载遮罩（reload 时叠在旧内容之上）：轻微半透明底 + 屏幕中心进度圈。
/// 搜索/筛选刷新时用它替代整屏白屏（见列表屏 skipLoadingOnReload）。
class DsLoadingScrim extends StatelessWidget {
  const DsLoadingScrim({super.key});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return GestureDetector(
      behavior: HitTestBehavior.opaque, // 加载期间拦截点击，避免误触
      onTap: () {},
      child: ColoredBox(
        color: t.bg.withValues(alpha: 0.55),
        child: Center(
          child: SizedBox(
            width: 34,
            height: 34,
            child: CircularProgressIndicator(strokeWidth: 3, color: t.primary),
          ),
        ),
      ),
    );
  }
}