// 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 'package:lucide_icons_flutter/lucide_icons.dart';
import '../../core/theme/context_tokens.dart';
import '../../core/theme/app_dims.g.dart';
import 'ds_menu.dart';

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

/// 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
  final bool large; // .btn.lg：h44 / pad 0 22 / fs14（登录/注册主按钮）

  const DsButton(
    this.label, {
    super.key,
    this.icon,
    this.onPressed,
    this.variant = DsBtnVariant.ghost,
    this.small = false,
    this.large = 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),
      // 语义确认键（审核通过/撤回等），色取 token
      DsBtnVariant.success => (t.success, t.onPrimary, t.success),
      DsBtnVariant.accent => (t.accent, t.onPrimary, t.accent),
    };
    // disabled（onPressed=null）置灰 55%：批量替换 Material 按钮后不能丢禁用反馈
    return Opacity(
        opacity: onPressed == null ? 0.55 : 1,
        child: Material(
          color: bg,
          borderRadius: BorderRadius.circular(AppDims.rMd),
          child: InkWell(
            onTap: onPressed,
            borderRadius: BorderRadius.circular(AppDims.rMd),
            child: Container(
              height: small ? 32 : (large ? 44 : 38),
              padding: EdgeInsets.symmetric(
                  horizontal: small ? 12 : (large ? 22 : 16)),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(AppDims.rMd),
                border: Border.all(color: border),
              ),
              child: Row(
                mainAxisSize: MainAxisSize.min,
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  if (icon != null) ...[
                    Icon(icon, size: 16, color: fg),
                    const SizedBox(width: 7),
                  ],
                  // Flexible+ellipsis：宿主给紧约束（如 dev-card 底部 flex:1）时不溢出
                  Flexible(
                    child: Text(label,
                        maxLines: 1,
                        softWrap: false,
                        overflow: TextOverflow.ellipsis,
                        style: TextStyle(
                            color: fg,
                            fontSize: small
                                ? AppDims.fsSm
                                : (large ? 14 : 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）
  // 纯切换 chip（原型 .chip.on，如 partners 类型筛选）：selected 直接给 on 态，
  // caret=false 去掉下拉箭头。
  final bool selected;
  final bool caret;
  const DsChip(
      {super.key,
      required this.label,
      this.value,
      this.onTap,
      this.onClear,
      this.selected = false,
      this.caret = true});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    final on = selected || (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 (value != null && value!.isNotEmpty) ...[
              const SizedBox(width: 7),
              Text(value!,
                  style: TextStyle(
                      fontSize: AppDims.fsSm,
                      color: t.primary,
                      fontWeight: FontWeight.w600)),
            ],
            // 选中且提供 onClear → 展示可点 ×（清该筛选）；否则展示下拉箭头；
            // 纯切换 chip（caret=false）无尾部图标。
            if (on && onClear != null) ...[
              const SizedBox(width: 7),
              GestureDetector(
                behavior: HitTestBehavior.opaque,
                onTap: onClear,
                child: Icon(LucideIcons.x, size: 14, color: t.muted),
              ),
            ] else if (caret) ...[
              const SizedBox(width: 7),
              Icon(LucideIcons.chevronDown, size: 14, color: t.faint),
            ],
          ],
        ),
      ),
    );
  }
}

// ── .seg ─────────────────────────────────────────────────────────────────
/// 原型 .seg：分段 tab（inline-flex / bg / border r-md / pad 3 gap 3）。
/// button h30 / pad 0 16 / fs-sm fw600 muted；选中=surface 底 + primary 字 + sh-1。
class DsSeg extends StatelessWidget {
  final List<String> items;
  final int index;
  final ValueChanged<int> onChanged;
  const DsSeg(
      {super.key,
      required this.items,
      required this.index,
      required this.onChanged});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return Container(
      padding: const EdgeInsets.all(3),
      decoration: BoxDecoration(
        color: t.bg,
        border: Border.all(color: t.border),
        borderRadius: BorderRadius.circular(AppDims.rMd),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          for (var i = 0; i < items.length; i++) ...[
            if (i > 0) const SizedBox(width: 3),
            InkWell(
              onTap: () => onChanged(i),
              borderRadius: BorderRadius.circular(AppDims.rSm),
              child: Container(
                height: 30,
                padding: const EdgeInsets.symmetric(horizontal: 16),
                alignment: Alignment.center,
                decoration: BoxDecoration(
                  color: i == index ? t.surface : null,
                  borderRadius: BorderRadius.circular(AppDims.rSm),
                  // 原型 --sh-1: 0 1px 3px var(--shadow)
                  boxShadow: i == index
                      ? [
                          BoxShadow(
                              color: t.shadow,
                              blurRadius: 3,
                              offset: const Offset(0, 1)),
                        ]
                      : null,
                ),
                child: Text(items[i],
                    style: TextStyle(
                        fontSize: AppDims.fsSm,
                        fontWeight: FontWeight.w600,
                        color: i == index ? t.primary : t.muted)),
              ),
            ),
          ],
        ],
      ),
    );
  }
}

// ── .searchbox ──────────────────────────────────────────────────────────────
/// 原型 .searchbox：h34 / bg / border r-md / gap8 / pad 0 11，前导放大镜 14(faint)。
/// 原型 .field：label（fs-sm muted）在控件上方、间距 6；required 缀红星。
/// 对话框/面板表单统一用它排字段，禁止 Material labelText 浮动标签。
class DsField extends StatelessWidget {
  final String label;
  final bool required;
  final Widget child;
  const DsField(this.label,
      {super.key, this.required = false, required Widget input})
      : child = input;

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(mainAxisSize: MainAxisSize.min, children: [
          Text(label, style: TextStyle(fontSize: AppDims.fsSm, color: t.muted)),
          if (required)
            Text(' *',
                style: TextStyle(fontSize: AppDims.fsSm, color: t.danger)),
        ]),
        const SizedBox(height: 6),
        child,
      ],
    );
  }
}

/// 原型 .check / .agree（login.html / register.html）：18×18 盒 + 1.5px 边 +
/// r-sm；选中 → primary 底/边 + 白勾(13, stroke2.4)；文案 fs-body，间距 8。
/// [label] 用 Widget 以承载富文本（如注册页协议链接）；[alignTop] 用于多行文案
/// （register .agree：align-items:flex-start + 盒 margin-top 1）。
class DsCheck extends StatelessWidget {
  final bool value;
  final ValueChanged<bool> onChanged;
  final Widget label;
  final bool alignTop;
  const DsCheck({
    super.key,
    required this.value,
    required this.onChanged,
    required this.label,
    this.alignTop = false,
  });

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return MouseRegion(
      cursor: SystemMouseCursors.click,
      child: GestureDetector(
        behavior: HitTestBehavior.opaque,
        onTap: () => onChanged(!value),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment:
              alignTop ? CrossAxisAlignment.start : CrossAxisAlignment.center,
          children: [
            Container(
              width: 18,
              height: 18,
              margin:
                  alignTop ? const EdgeInsets.only(top: 1) : EdgeInsets.zero,
              alignment: Alignment.center,
              decoration: BoxDecoration(
                color: value ? t.primary : t.surface,
                border:
                    Border.all(color: value ? t.primary : t.border, width: 1.5),
                borderRadius: BorderRadius.circular(AppDims.rSm),
              ),
              child: value
                  ? Icon(LucideIcons.check, size: 13, color: t.onPrimary)
                  : null,
            ),
            SizedBox(width: alignTop ? 9 : 8),
            Flexible(child: label),
          ],
        ),
      ),
    );
  }
}

/// 原型 .input：h38 / surface / 1px border / r-md / pad 0 11 / fs-body；
/// focus → primary 边；readonly/disabled → bg 底 + muted 字。
class DsInput extends StatelessWidget {
  final TextEditingController? controller;
  final bool enabled;
  final String? hintText;
  final ValueChanged<String>? onChanged;
  final ValueChanged<String>? onSubmitted;
  final TextInputType? keyboardType;
  final FocusNode? focusNode;
  final bool obscureText; // 密码框
  final Widget? suffix; // 行内后缀（历史下拉箭头 / 密码可见切换）
  const DsInput({
    super.key,
    this.controller,
    this.enabled = true,
    this.hintText,
    this.onChanged,
    this.onSubmitted,
    this.keyboardType,
    this.focusNode,
    this.obscureText = false,
    this.suffix,
  });

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    OutlineInputBorder line(Color c) => OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppDims.rMd),
          borderSide: BorderSide(color: c),
        );
    return SizedBox(
      height: 38,
      child: TextField(
        controller: controller,
        enabled: enabled,
        onChanged: onChanged,
        onSubmitted: onSubmitted,
        keyboardType: keyboardType,
        focusNode: focusNode,
        obscureText: obscureText,
        // letterSpacing 0：M3 默认字距比原型（无字距）宽，数字/拉丁明显
        style: TextStyle(
            fontSize: AppDims.fsBody,
            letterSpacing: 0,
            color: enabled ? t.text : t.muted),
        decoration: InputDecoration(
          isDense: true,
          // 装饰盒锁死 .input 的 38 高（不随 visualDensity 漂移）
          constraints: const BoxConstraints.tightFor(height: 38),
          filled: true,
          fillColor: enabled ? t.surface : t.bg,
          hintText: hintText,
          hintStyle: TextStyle(fontSize: AppDims.fsBody, color: t.faint),
          contentPadding:
              const EdgeInsets.symmetric(horizontal: 11, vertical: 9),
          suffixIcon: suffix == null
              ? null
              : Padding(
                  padding: const EdgeInsets.only(right: 9), child: suffix),
          suffixIconConstraints:
              const BoxConstraints(minWidth: 0, minHeight: 0),
          enabledBorder: line(t.border),
          disabledBorder: line(t.border),
          focusedBorder: line(t.primary),
          border: line(t.border),
        ),
      ),
    );
  }
}

/// 原型 select：.input 盒式外观（h38/surface/border/r-md/pad 0 11 + 右侧
/// chevron），点击弹 DsMenu（.menu 弹层，含 ✓ 选中态、锚定坐标已对齐）。
/// 统一替代 Material DropdownButton——其默认灰底方角弹层不属 ds 体系。
class DsSelect<T> extends StatelessWidget {
  final T? value;
  final List<(T, String)> options;
  final ValueChanged<T>? onChanged;
  final String hint;
  const DsSelect({
    super.key,
    required this.value,
    required this.options,
    required this.onChanged,
    this.hint = '请选择…',
  });

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    final label =
        options.where((o) => o.$1 == value).map((o) => o.$2).firstOrNull;
    final enabled = onChanged != null;
    return Builder(
      builder: (bctx) => InkWell(
        onTap: enabled
            ? () async {
                final picked = await showDsMenu<T>(bctx, items: [
                  for (final o in options)
                    DsMenuItem(
                        value: o.$1, label: o.$2, selected: o.$1 == value),
                ]);
                if (picked != null) onChanged!(picked);
              }
            : null,
        borderRadius: BorderRadius.circular(AppDims.rMd),
        child: Container(
          height: 38,
          padding: const EdgeInsets.symmetric(horizontal: 11),
          decoration: BoxDecoration(
            color: enabled ? t.surface : t.bg,
            border: Border.all(color: t.border),
            borderRadius: BorderRadius.circular(AppDims.rMd),
          ),
          child: Row(children: [
            Expanded(
              child: Text(label ?? hint,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: TextStyle(
                      fontSize: AppDims.fsBody,
                      color: label == null
                          ? t.faint
                          : (enabled ? t.text : t.muted))),
            ),
            const SizedBox(width: 8),
            Icon(LucideIcons.chevronDown, size: 14, color: t.muted),
          ]),
        ),
      ),
    );
  }
}

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(LucideIcons.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,
                  contentPadding: EdgeInsets.zero,
                  border: InputBorder.none,
                  filled: false,
                  enabledBorder: InputBorder.none,
                  focusedBorder: 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(LucideIcons.x, 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),
          ),
        ),
      ),
    );
  }
}