// GarageUI button family — hand rolled replacement for shadcn's button.dart.
//
// this replicates shadcn_flutter 0.0.52 control/button.dart (+ clickable state
// machinery + focus_outline) as close to pixel identical as i could get it.
// colours/typography/radii all come from the SAME source shadcn reads:
// GarageTheme.of(context) (imported with the `shad` prefix below), so the look matches.
//
// only the widgets the app actually uses live here. some rarely used shadcn
// params/variants were dropped — see the report / notes near the bottom.

import "dart:math";

import "package:flutter/scheduler.dart";
import "package:flutter/services.dart";
import "package:flutter/widgets.dart";
import "package:garage_ui/theme/garage_theme.dart";
import "package:garage_ui/theme/support.dart";

// shadcn multiplies the existing alpha by a factor (not withOpacity which
// replaces it). keep that behaviour so faded states look the same.
Color _scaleAlpha(Color c, double factor) {
  return c.withValues(alpha: c.a * factor);
}

bool _isMobile(TargetPlatform platform) {
  return platform == TargetPlatform.iOS ||
      platform == TargetPlatform.android ||
      platform == TargetPlatform.fuchsia;
}

// ---------------------------------------------------------------------------
// size / density / shape
// ---------------------------------------------------------------------------

/// relative scale factor for a button (text, icon, padding all scale by this).
class ButtonSize {
  final double scale;
  const ButtonSize(this.scale);

  static const ButtonSize normal = ButtonSize(1);
  static const ButtonSize xSmall = ButtonSize(1 / 2);
  static const ButtonSize small = ButtonSize(3 / 4);
  static const ButtonSize large = ButtonSize(2);
  static const ButtonSize xLarge = ButtonSize(3);
}

/// Collapses padding to its smallest side, so an icon-only control comes out
/// square instead of inheriting the asymmetric control padding.
EdgeInsets _squarePadding(EdgeInsets padding) {
  return EdgeInsets.all(
    min(padding.top, min(padding.bottom, min(padding.left, padding.right))),
  );
}

/// The single padding resolution every control in the family goes through —
/// buttons, icon buttons, and the select trigger. Keep it that way: the reason
/// four different control heights existed was three places each doing their own
/// version of this maths.
///
/// A null [density] means "follow the theme", which is what everything should
/// pass unless a call site deliberately wants to break out of the app density.
EdgeInsets resolveControlPadding(
  ThemeData theme, {
  ControlDensity? density,
  bool includesBorder = false,
  bool squarePadding = false,
  double sizeScale = 1.0,
}) {
  final resolved = density ?? ControlDensity.of(theme);
  final base = squarePadding
      ? resolved.resolveIcon(theme)
      : resolved.resolve(theme);
  final scaled = base * sizeScale;
  if (!includesBorder) return scaled;

  // Border dimensions are added by Container after its explicit padding.
  // Remove the unscaled stroke from each side after applying ButtonSize so
  // every density/size keeps the same intended outer dimensions.
  final border = resolved.tokens(theme).controlBorderWidth;
  return EdgeInsets.fromLTRB(
    max(0.0, scaled.left - border),
    max(0.0, scaled.top - border),
    max(0.0, scaled.right - border),
    max(0.0, scaled.bottom - border),
  );
}

/// rectangle (rounded corners) or a full circle.
enum ButtonShape { rectangle, circle }

// ---------------------------------------------------------------------------
// style abstraction
// ---------------------------------------------------------------------------

typedef ButtonStateProperty<T> =
    T Function(BuildContext context, Set<WidgetState> states);

typedef ButtonStatePropertyDelegate<T> =
    T Function(BuildContext context, Set<WidgetState> states, T value);

/// contract every button style implements — state aware getters for each prop.
abstract class AbstractButtonStyle {
  ButtonStateProperty<Decoration> get decoration;
  ButtonStateProperty<MouseCursor> get mouseCursor;
  ButtonStateProperty<EdgeInsetsGeometry> get padding;
  ButtonStateProperty<TextStyle> get textStyle;
  ButtonStateProperty<IconThemeData> get iconTheme;
  ButtonStateProperty<EdgeInsetsGeometry> get margin;

  /// null = follow the theme's [ControlDensity].
  ControlDensity? get density;
  bool get squarePadding;
  bool get includesBorder;
}

/// concrete style variant — holds the actual state property functions.
class ButtonVariance implements AbstractButtonStyle {
  // a bare variance has no opinion on density, so it follows the theme. it used
  // to claim ControlDensity.normal, which nothing read (ButtonStyle overrides
  // padding wholesale) but was a nasty lie if you ever looked at it.
  @override
  ControlDensity? get density => null;

  @override
  bool get squarePadding => false;

  @override
  final bool includesBorder;

  static const AbstractButtonStyle primary = ButtonVariance(
    decoration: _buttonPrimaryDecoration,
    mouseCursor: _buttonMouseCursor,
    textStyle: _buttonPrimaryTextStyle,
    iconTheme: _buttonPrimaryIconTheme,
    margin: _buttonZeroMargin,
    includesBorder: true,
  );

  static const AbstractButtonStyle secondary = ButtonVariance(
    decoration: _buttonSecondaryDecoration,
    mouseCursor: _buttonMouseCursor,
    textStyle: _buttonSecondaryTextStyle,
    iconTheme: _buttonSecondaryIconTheme,
    margin: _buttonZeroMargin,
    includesBorder: true,
  );

  static const AbstractButtonStyle outline = ButtonVariance(
    decoration: _buttonOutlineDecoration,
    mouseCursor: _buttonMouseCursor,
    textStyle: _buttonOutlineTextStyle,
    iconTheme: _buttonOutlineIconTheme,
    margin: _buttonZeroMargin,
    includesBorder: true,
  );

  static const AbstractButtonStyle ghost = ButtonVariance(
    decoration: _buttonGhostDecoration,
    mouseCursor: _buttonMouseCursor,
    textStyle: _buttonGhostTextStyle,
    iconTheme: _buttonGhostIconTheme,
    margin: _buttonZeroMargin,
  );

  static const AbstractButtonStyle link = ButtonVariance(
    decoration: _buttonLinkDecoration,
    mouseCursor: _buttonMouseCursor,
    textStyle: _buttonLinkTextStyle,
    iconTheme: _buttonLinkIconTheme,
    margin: _buttonZeroMargin,
  );

  static const AbstractButtonStyle text = ButtonVariance(
    decoration: _buttonTextDecoration,
    mouseCursor: _buttonMouseCursor,
    textStyle: _buttonTextTextStyle,
    iconTheme: _buttonTextIconTheme,
    margin: _buttonZeroMargin,
  );

  static const AbstractButtonStyle destructive = ButtonVariance(
    decoration: _buttonDestructiveDecoration,
    mouseCursor: _buttonMouseCursor,
    textStyle: _buttonDestructiveTextStyle,
    iconTheme: _buttonDestructiveIconTheme,
    margin: _buttonZeroMargin,
  );

  @override
  final ButtonStateProperty<Decoration> decoration;
  @override
  final ButtonStateProperty<MouseCursor> mouseCursor;
  @override
  final ButtonStateProperty<TextStyle> textStyle;
  @override
  final ButtonStateProperty<IconThemeData> iconTheme;
  @override
  final ButtonStateProperty<EdgeInsetsGeometry> margin;

  // padding is NOT a per-variance field. it used to be, and every variance was
  // handed the same _buttonPadding function that ignored the border inset — so
  // a bare `Button(style: ButtonVariance.outline)` came out 2px bigger on both
  // axes than the identical `Button.outline`. it goes through the shared
  // resolution now, same as ButtonStyle.
  @override
  ButtonStateProperty<EdgeInsetsGeometry> get padding => _variancePadding;

  EdgeInsets _variancePadding(BuildContext context, Set<WidgetState> states) {
    return resolveControlPadding(
      GarageTheme.of(context),
      includesBorder: includesBorder,
    );
  }

  const ButtonVariance({
    required this.decoration,
    required this.mouseCursor,
    required this.textStyle,
    required this.iconTheme,
    required this.margin,
    this.includesBorder = false,
  });
}

/// composable style = a variance + size + density + shape modifiers.
class ButtonStyle implements AbstractButtonStyle {
  final AbstractButtonStyle variance;
  final ButtonSize size;
  @override
  final ControlDensity? density;
  final ButtonShape shape;

  // collapse padding to its smallest side so an icon-only control is square.
  @override
  final bool squarePadding;

  @override
  bool get includesBorder => variance.includesBorder;

  // hard padding override - wins over the density. [IconButton] uses this to
  // zero the padding, because it sizes its own box to the control height
  // instead and just centres the icon in it.
  final EdgeInsetsGeometry? paddingOverride;

  const ButtonStyle({
    required this.variance,
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  });

  const ButtonStyle.primary({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  }) : variance = ButtonVariance.primary;

  const ButtonStyle.secondary({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  }) : variance = ButtonVariance.secondary;

  const ButtonStyle.outline({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  }) : variance = ButtonVariance.outline;

  const ButtonStyle.ghost({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  }) : variance = ButtonVariance.ghost;

  const ButtonStyle.link({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  }) : variance = ButtonVariance.link;

  const ButtonStyle.text({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  }) : variance = ButtonVariance.text;

  const ButtonStyle.destructive({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = false,
    this.paddingOverride,
  }) : variance = ButtonVariance.destructive;

  // icon flavours — same as above but default to icon density (square padding)
  const ButtonStyle.primaryIcon({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = true,
    this.paddingOverride,
  }) : variance = ButtonVariance.primary;

  const ButtonStyle.secondaryIcon({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = true,
    this.paddingOverride,
  }) : variance = ButtonVariance.secondary;

  const ButtonStyle.outlineIcon({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = true,
    this.paddingOverride,
  }) : variance = ButtonVariance.outline;

  const ButtonStyle.ghostIcon({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = true,
    this.paddingOverride,
  }) : variance = ButtonVariance.ghost;

  const ButtonStyle.destructiveIcon({
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.squarePadding = true,
    this.paddingOverride,
  }) : variance = ButtonVariance.destructive;

  @override
  ButtonStateProperty<Decoration> get decoration {
    if (shape == ButtonShape.circle) {
      return _resolveCircleDecoration;
    }
    return variance.decoration;
  }

  Decoration _resolveCircleDecoration(
    BuildContext context,
    Set<WidgetState> states,
  ) {
    var decoration = variance.decoration(context, states);
    if (decoration is BoxDecoration) {
      return BoxDecoration(
        color: decoration.color,
        image: decoration.image,
        border: decoration.border,
        borderRadius: null,
        boxShadow: decoration.boxShadow,
        gradient: decoration.gradient,
        shape: BoxShape.circle,
        backgroundBlendMode: decoration.backgroundBlendMode,
      );
    }
    // only box decorations are used by our variances, but stay safe
    return decoration;
  }

  @override
  ButtonStateProperty<MouseCursor> get mouseCursor => variance.mouseCursor;

  // padding comes from the density (+ size scale), not the variance - every
  // variance shares the same control padding, only the density changes it.
  @override
  ButtonStateProperty<EdgeInsetsGeometry> get padding => _resolvePadding;

  EdgeInsetsGeometry _resolvePadding(
    BuildContext context,
    Set<WidgetState> states,
  ) {
    if (paddingOverride != null) return paddingOverride!;
    return resolveControlPadding(
      GarageTheme.of(context),
      density: density,
      includesBorder: includesBorder,
      squarePadding: squarePadding,
      sizeScale: size.scale,
    );
  }

  @override
  ButtonStateProperty<TextStyle> get textStyle {
    if (size == ButtonSize.normal) {
      return variance.textStyle;
    }
    return _resolveTextStyle;
  }

  TextStyle _resolveTextStyle(BuildContext context, Set<WidgetState> states) {
    var fontSize = variance.textStyle(context, states).fontSize;
    if (fontSize == null) {
      final textStyle = DefaultTextStyle.of(context).style;
      fontSize = textStyle.fontSize ?? 14;
    }
    return variance
        .textStyle(context, states)
        .copyWith(fontSize: fontSize * size.scale);
  }

  @override
  ButtonStateProperty<IconThemeData> get iconTheme {
    if (size == ButtonSize.normal) {
      return variance.iconTheme;
    }
    return _resolveIconTheme;
  }

  IconThemeData _resolveIconTheme(
    BuildContext context,
    Set<WidgetState> states,
  ) {
    var iconSize = variance.iconTheme(context, states).size;
    iconSize ??= IconTheme.of(context).size ?? 24;
    return variance
        .iconTheme(context, states)
        .copyWith(size: iconSize * size.scale);
  }

  @override
  ButtonStateProperty<EdgeInsetsGeometry> get margin => variance.margin;
}

/// copyWith for styles — lets you layer state-aware overrides on top of a base
/// style (Toggle relies on this to dim its foreground on hover).
extension ButtonStyleExtension on AbstractButtonStyle {
  AbstractButtonStyle copyWith({
    ButtonStatePropertyDelegate<Decoration>? decoration,
    ButtonStatePropertyDelegate<MouseCursor>? mouseCursor,
    ButtonStatePropertyDelegate<EdgeInsetsGeometry>? padding,
    ButtonStatePropertyDelegate<TextStyle>? textStyle,
    ButtonStatePropertyDelegate<IconThemeData>? iconTheme,
    ButtonStatePropertyDelegate<EdgeInsetsGeometry>? margin,
  }) {
    if (decoration == null &&
        mouseCursor == null &&
        padding == null &&
        textStyle == null &&
        iconTheme == null &&
        margin == null) {
      return this;
    }
    return _CopyWithButtonStyle(
      this,
      decoration,
      mouseCursor,
      padding,
      textStyle,
      iconTheme,
      margin,
    );
  }
}

class _CopyWithButtonStyle implements AbstractButtonStyle {
  final ButtonStatePropertyDelegate<Decoration>? _decoration;
  final ButtonStatePropertyDelegate<MouseCursor>? _mouseCursor;
  final ButtonStatePropertyDelegate<EdgeInsetsGeometry>? _padding;
  final ButtonStatePropertyDelegate<TextStyle>? _textStyle;
  final ButtonStatePropertyDelegate<IconThemeData>? _iconTheme;
  final ButtonStatePropertyDelegate<EdgeInsetsGeometry>? _margin;
  final AbstractButtonStyle _delegate;

  const _CopyWithButtonStyle(
    this._delegate,
    this._decoration,
    this._mouseCursor,
    this._padding,
    this._textStyle,
    this._iconTheme,
    this._margin,
  );

  @override
  ControlDensity? get density => _delegate.density;

  @override
  bool get squarePadding => _delegate.squarePadding;

  @override
  bool get includesBorder => _delegate.includesBorder;

  @override
  ButtonStateProperty<IconThemeData> get iconTheme {
    if (_iconTheme == null) return _delegate.iconTheme;
    return (context, states) =>
        _iconTheme(context, states, _delegate.iconTheme(context, states));
  }

  @override
  ButtonStateProperty<TextStyle> get textStyle {
    if (_textStyle == null) return _delegate.textStyle;
    return (context, states) =>
        _textStyle(context, states, _delegate.textStyle(context, states));
  }

  @override
  ButtonStateProperty<EdgeInsetsGeometry> get padding {
    if (_padding == null) return _delegate.padding;
    return (context, states) =>
        _padding(context, states, _delegate.padding(context, states));
  }

  @override
  ButtonStateProperty<MouseCursor> get mouseCursor {
    if (_mouseCursor == null) return _delegate.mouseCursor;
    return (context, states) =>
        _mouseCursor(context, states, _delegate.mouseCursor(context, states));
  }

  @override
  ButtonStateProperty<Decoration> get decoration {
    if (_decoration == null) return _delegate.decoration;
    return (context, states) =>
        _decoration(context, states, _delegate.decoration(context, states));
  }

  @override
  ButtonStateProperty<EdgeInsetsGeometry> get margin {
    if (_margin == null) return _delegate.margin;
    return (context, states) =>
        _margin(context, states, _delegate.margin(context, states));
  }
}

// ---------------------------------------------------------------------------
// concrete state property functions (copied verbatim from shadcn)
// ---------------------------------------------------------------------------

EdgeInsets _buttonZeroMargin(BuildContext context, Set<WidgetState> states) {
  return EdgeInsets.zero;
}

MouseCursor _buttonMouseCursor(BuildContext context, Set<WidgetState> states) {
  return states.contains(WidgetState.disabled)
      ? SystemMouseCursors.basic
      : SystemMouseCursors.click;
}

// PRIMARY
Decoration _buttonPrimaryDecoration(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  if (states.contains(WidgetState.disabled)) {
    return BoxDecoration(
      color: themeData.colorScheme.mutedForeground,
      border: Border.all(
        color: themeData.colorScheme.controlBorder,
        width: themeData.density.controlBorderWidth,
      ),
      borderRadius: BorderRadius.circular(themeData.radiusMd),
    );
  }
  if (states.contains(WidgetState.hovered)) {
    return BoxDecoration(
      color: themeData.colorScheme.primaryHovered,
      border: Border.all(
        color: themeData.colorScheme.controlBorder,
        width: themeData.density.controlBorderWidth,
      ),
      borderRadius: BorderRadius.circular(themeData.radiusMd),
    );
  }
  return BoxDecoration(
    color: themeData.colorScheme.primary,
    border: Border.all(
      color: themeData.colorScheme.controlBorder,
      width: themeData.density.controlBorderWidth,
    ),
    borderRadius: BorderRadius.circular(themeData.radiusMd),
  );
}

TextStyle _buttonPrimaryTextStyle(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  // semiBold, where every other variant is medium. Primary is the one style
  // that puts DARK text on a LIGHT fill, and that polarity reads thinner: a
  // light ground bleeds into the strokes during antialiasing where a dark one
  // bleeds out of them. Same weight either way, so the two looked mismatched
  // sat next to each other. This is optical compensation, not emphasis - it
  // buys back what the polarity takes, which is why it isn't applied to the
  // variants that already sit light-on-dark.
  return themeData.typography.small
      .merge(themeData.typography.semiBold)
      .copyWith(color: themeData.colorScheme.primaryForeground);
}

IconThemeData _buttonPrimaryIconTheme(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return IconThemeData(
    color: themeData.colorScheme.primaryForeground,
    size: themeData.iconTheme.small.size,
  );
}

// SECONDARY
Decoration _buttonSecondaryDecoration(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  final scheme = themeData.colorScheme;
  if (states.contains(WidgetState.hovered)) {
    return BoxDecoration(
      color: scheme.secondaryHovered,
      border: Border.all(
        color: scheme.controlBorder,
        width: themeData.density.controlBorderWidth,
      ),
      borderRadius: BorderRadius.circular(themeData.radiusMd),
    );
  }
  return BoxDecoration(
    color: scheme.secondary,
    border: Border.all(
      color: scheme.controlBorder,
      width: themeData.density.controlBorderWidth,
    ),
    borderRadius: BorderRadius.circular(themeData.radiusMd),
  );
}

TextStyle _buttonSecondaryTextStyle(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return themeData.typography.small.copyWith(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : themeData.colorScheme.secondaryForeground,
  );
}

IconThemeData _buttonSecondaryIconTheme(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return IconThemeData(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : themeData.colorScheme.secondaryForeground,
    size: themeData.iconTheme.small.size,
  );
}

// OUTLINE
// same tokens TextField's own decoration uses (controlFill/Hovered +
// controlBorder + radiusMd) - the explorer's search field + add button are the
// reference look or this, and outline is the "standard" button/field border
// style app-wide, so they read as one family instead of each getting styled
// by hand per call site.
Decoration _buttonOutlineDecoration(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  final scheme = themeData.colorScheme;
  if (states.contains(WidgetState.disabled)) {
    return BoxDecoration(
      color: scheme.controlFill,
      // no strokeAlign override - defaults to inside, same as TextField's own
      // border. Center-aligned (the old value) paints half the stroke
      // outside the box, which is what made this read a pixel bigger than
      // an equivalent field on every side.
      border: Border.all(
        color: scheme.controlBorder,
        width: themeData.density.controlBorderWidth,
      ),
      borderRadius: BorderRadius.circular(themeData.radiusMd),
    );
  }
  if (states.contains(WidgetState.hovered)) {
    return BoxDecoration(
      color: scheme.controlFillHovered,
      // no strokeAlign override - defaults to inside, same as TextField's own
      // border. Center-aligned (the old value) paints half the stroke
      // outside the box, which is what made this read a pixel bigger than
      // an equivalent field on every side.
      border: Border.all(
        color: scheme.controlBorder,
        width: themeData.density.controlBorderWidth,
      ),
      borderRadius: BorderRadius.circular(themeData.radiusMd),
    );
  }
  return BoxDecoration(
    color: scheme.controlFill,
    border: Border.all(
      color: scheme.controlBorder,
      width: themeData.density.controlBorderWidth,
    ),
    borderRadius: BorderRadius.circular(themeData.radiusMd),
  );
}

TextStyle _buttonOutlineTextStyle(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return themeData.typography.small.copyWith(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : themeData.colorScheme.foreground,
  );
}

// muted, not foreground - the explorer's tool button is the reference for
// this style and its icon sat at mutedForeground.
IconThemeData _buttonOutlineIconTheme(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return IconThemeData(
    color: themeData.colorScheme.mutedForeground,
    size: themeData.iconTheme.small.size,
  );
}

// GHOST
/// Ghost TINTS what its standing on, rather than painting a colour over it.
///
/// It used to fill with `muted` at 0.8 alpha - near enough opaque, and picked
/// against one surface. Put the same button on a different one (the properties
/// actions band, which is itself `muted`; a panel; a rail) and the fill either
/// vanished into the surface or sat on it as a slab, which is the opposite of
/// what ghost means.
///
/// A low-alpha wash of the foreground works anywhere: on a dark surface it
/// lifts, on a light one it darkens, and it always reads as the SAME surface
/// with a highlight rather than a different colour laid on top.
Decoration _buttonGhostDecoration(
  BuildContext context,
  Set<WidgetState> states,
) {
  final themeData = GarageTheme.of(context);
  final radius = BorderRadius.circular(themeData.radiusMd);
  final tint = themeData.colorScheme.foreground;

  if (states.contains(WidgetState.disabled)) {
    return BoxDecoration(color: const Color(0x00000000), borderRadius: radius);
  }
  if (states.contains(WidgetState.pressed)) {
    return BoxDecoration(
      color: tint.withValues(alpha: 0.12),
      borderRadius: radius,
    );
  }
  if (states.contains(WidgetState.hovered)) {
    return BoxDecoration(
      color: tint.withValues(alpha: 0.07),
      borderRadius: radius,
    );
  }
  return BoxDecoration(color: const Color(0x00000000), borderRadius: radius);
}

TextStyle _buttonGhostTextStyle(BuildContext context, Set<WidgetState> states) {
  var themeData = GarageTheme.of(context);
  return themeData.typography.small.copyWith(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : themeData.colorScheme.foreground,
  );
}

IconThemeData _buttonGhostIconTheme(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return IconThemeData(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : themeData.colorScheme.foreground,
    size: themeData.iconTheme.small.size,
  );
}

// LINK
Decoration _buttonLinkDecoration(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return BoxDecoration(borderRadius: BorderRadius.circular(themeData.radiusMd));
}

TextStyle _buttonLinkTextStyle(BuildContext context, Set<WidgetState> states) {
  var themeData = GarageTheme.of(context);
  return themeData.typography.small.copyWith(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : themeData.colorScheme.foreground,
    decoration: states.contains(WidgetState.hovered)
        ? TextDecoration.underline
        : TextDecoration.none,
  );
}

IconThemeData _buttonLinkIconTheme(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return IconThemeData(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : themeData.colorScheme.foreground,
    size: themeData.iconTheme.small.size,
  );
}

// TEXT
Decoration _buttonTextDecoration(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return BoxDecoration(borderRadius: BorderRadius.circular(themeData.radiusMd));
}

TextStyle _buttonTextTextStyle(BuildContext context, Set<WidgetState> states) {
  var themeData = GarageTheme.of(context);
  return themeData.typography.small.copyWith(
    color: states.contains(WidgetState.hovered)
        ? themeData.colorScheme.primary
        : themeData.colorScheme.mutedForeground,
  );
}

IconThemeData _buttonTextIconTheme(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return IconThemeData(
    color: states.contains(WidgetState.hovered)
        ? themeData.colorScheme.primary
        : themeData.colorScheme.mutedForeground,
    size: themeData.iconTheme.small.size,
  );
}

// DESTRUCTIVE
Decoration _buttonDestructiveDecoration(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  if (states.contains(WidgetState.disabled)) {
    return BoxDecoration(
      color: themeData.colorScheme.primaryForeground,
      borderRadius: BorderRadius.circular(themeData.radiusMd),
    );
  }
  if (states.contains(WidgetState.hovered)) {
    return BoxDecoration(
      color: _scaleAlpha(themeData.colorScheme.destructive, 0.8),
      borderRadius: BorderRadius.circular(themeData.radiusMd),
    );
  }
  return BoxDecoration(
    color: _scaleAlpha(themeData.colorScheme.destructive, 0.5),
    borderRadius: BorderRadius.circular(themeData.radiusMd),
  );
}

TextStyle _buttonDestructiveTextStyle(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return themeData.typography.small.copyWith(
    // yeah ik, its straight up white regardless of light or dark mode
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : const Color(0xFFFFFFFF),
  );
}

IconThemeData _buttonDestructiveIconTheme(
  BuildContext context,
  Set<WidgetState> states,
) {
  var themeData = GarageTheme.of(context);
  return IconThemeData(
    color: states.contains(WidgetState.disabled)
        ? themeData.colorScheme.mutedForeground
        : const Color(0xFFFFFFFF),
    size: themeData.iconTheme.small.size,
  );
}

// ---------------------------------------------------------------------------
// button group border merging
// ---------------------------------------------------------------------------

// corner radius multipliers so adjacent buttons in a group look joined.
class ButtonGroupCorners {
  final double topStart;
  final double topEnd;
  final double bottomStart;
  final double bottomEnd;

  const ButtonGroupCorners(
    this.topStart,
    this.topEnd,
    this.bottomStart,
    this.bottomEnd,
  );

  static ButtonGroupCorners horizontalIndex(int i, int len) {
    if (len <= 1) return const ButtonGroupCorners(1, 1, 1, 1);
    if (i == 0) return const ButtonGroupCorners(1, 0, 1, 0); // start
    if (i == len - 1) return const ButtonGroupCorners(0, 1, 0, 1); // end
    return const ButtonGroupCorners(0, 0, 0, 0);
  }

  static ButtonGroupCorners verticalIndex(int i, int len) {
    if (len <= 1) return const ButtonGroupCorners(1, 1, 1, 1);
    if (i == 0) return const ButtonGroupCorners(1, 1, 0, 0); // top
    if (i == len - 1) return const ButtonGroupCorners(0, 0, 1, 1); // bottom
    return const ButtonGroupCorners(0, 0, 0, 0);
  }

  /// Both groups' say on a corner, for a group nested in another group. The
  /// factors are 0-or-1 keeps, so "round only where BOTH agree" is a product:
  /// a field that is bottom row of a vertical group AND start of a horizontal
  /// one keeps its bottom-start corner and nothing else.
  ButtonGroupCorners merge(ButtonGroupCorners other) => ButtonGroupCorners(
    topStart * other.topStart,
    topEnd * other.topEnd,
    bottomStart * other.bottomStart,
    bottomEnd * other.bottomEnd,
  );

  BorderRadius applyTo(
    BorderRadiusGeometry radius,
    TextDirection textDirection,
  ) {
    final ltr = textDirection == TextDirection.ltr;
    final tl = ltr ? topStart : topEnd;
    final tr = ltr ? topEnd : topStart;
    final bl = ltr ? bottomStart : bottomEnd;
    final br = ltr ? bottomEnd : bottomStart;
    final r = radius.resolve(textDirection);
    return BorderRadius.only(
      topLeft: Radius.elliptical(r.topLeft.x * tl, r.topLeft.y * tl),
      topRight: Radius.elliptical(r.topRight.x * tr, r.topRight.y * tr),
      bottomLeft: Radius.elliptical(r.bottomLeft.x * bl, r.bottomLeft.y * bl),
      bottomRight: Radius.elliptical(
        r.bottomRight.x * br,
        r.bottomRight.y * br,
      ),
    );
  }
}

class ButtonGroupScope extends InheritedWidget {
  final ButtonGroupCorners corners;

  /// Edges a preceding member of the group already painted. Stored as flags
  /// rather than worked out from an axis and an index, because a group nested
  /// in another group can be told to drop BOTH - the password row's field
  /// gives up its top edge to the email above it and its end edge to the eye
  /// beside it, and one axis-and-index pair cant say that.
  final bool hideTop;
  final bool hideStart;

  const ButtonGroupScope({
    super.key,
    required this.corners,
    this.hideTop = false,
    this.hideStart = false,
    required super.child,
  });

  static ButtonGroupScope? maybeOf(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<ButtonGroupScope>();
  }

  /// Removes the edges already painted by a preceding group member, so
  /// neighbours share one stroke instead of stacking two.
  Border mergedBorder(Border border, TextDirection textDirection) {
    final ltr = textDirection == TextDirection.ltr;
    return Border(
      top: hideTop ? BorderSide.none : border.top,
      right: (hideStart && !ltr) ? BorderSide.none : border.right,
      bottom: border.bottom,
      left: (hideStart && ltr) ? BorderSide.none : border.left,
    );
  }

  @override
  bool updateShouldNotify(ButtonGroupScope oldWidget) {
    return oldWidget.corners != corners ||
        oldWidget.hideTop != hideTop ||
        oldWidget.hideStart != hideStart;
  }
}

// ---------------------------------------------------------------------------
// the base Button (clickable machinery lives in its state)
// ---------------------------------------------------------------------------

/// the foundational interactive button. wraps content in state aware
/// decoration/padding/text/icon styling with hover + press + focus handling.
class Button extends StatefulWidget {
  final bool? enabled;
  final bool disableTransition;
  final Widget? leading;
  final Widget? trailing;
  final double? leadingGap;
  final double? trailingGap;
  final Widget child;
  final VoidCallback? onPressed;
  final FocusNode? focusNode;
  final AlignmentGeometry? alignment;
  final AbstractButtonStyle style;
  final ValueChanged<bool>? onHover;
  final ValueChanged<bool>? onFocus;
  final bool? enableFeedback;
  final GestureTapDownCallback? onTapDown;
  final GestureTapUpCallback? onTapUp;
  final GestureTapCancelCallback? onTapCancel;
  final GestureTapDownCallback? onSecondaryTapDown;
  final GestureTapUpCallback? onSecondaryTapUp;
  final GestureTapCancelCallback? onSecondaryTapCancel;
  final GestureTapDownCallback? onTertiaryTapDown;
  final GestureTapUpCallback? onTertiaryTapUp;
  final GestureTapCancelCallback? onTertiaryTapCancel;
  final GestureLongPressStartCallback? onLongPressStart;
  final GestureLongPressUpCallback? onLongPressUp;
  final GestureLongPressMoveUpdateCallback? onLongPressMoveUpdate;
  final GestureLongPressEndCallback? onLongPressEnd;
  final GestureLongPressUpCallback? onSecondaryLongPress;
  final GestureLongPressUpCallback? onTertiaryLongPress;
  final bool disableHoverEffect;
  final WidgetStatesController? statesController;
  final AlignmentGeometry? marginAlignment;
  final bool disableFocusOutline;

  /// screen reader label. Only set this when the button has no text child to
  /// read — an icon-only button, basically. If you set it on a button that
  /// does have a Text child you get both read out, which is just noise.
  final String? semanticLabel;

  /// when non-null the button announces as a toggle in the given state rather
  /// than as a plain button. Toggle passes this through.
  final bool? semanticToggled;

  /// when non-null the button announces as one option of a segmented control
  /// (a mutually exclusive group) in the given state. Use this for two-or-more
  /// buttons that are modes of a single setting; use [semanticToggled] for a
  /// standalone on/off.
  final bool? semanticSelected;

  const Button({
    super.key,
    this.statesController,
    this.leading,
    this.trailing,
    this.leadingGap,
    this.trailingGap,
    required this.child,
    this.onPressed,
    this.focusNode,
    this.alignment,
    required this.style,
    this.enabled,
    this.disableTransition = false,
    this.onFocus,
    this.onHover,
    this.disableHoverEffect = false,
    this.enableFeedback,
    this.onTapDown,
    this.onTapUp,
    this.onTapCancel,
    this.onSecondaryTapDown,
    this.onSecondaryTapUp,
    this.onSecondaryTapCancel,
    this.onTertiaryTapDown,
    this.onTertiaryTapUp,
    this.onTertiaryTapCancel,
    this.onLongPressStart,
    this.onLongPressUp,
    this.onLongPressMoveUpdate,
    this.onLongPressEnd,
    this.onSecondaryLongPress,
    this.onTertiaryLongPress,
    this.semanticLabel,
    this.semanticToggled,
    this.semanticSelected,
    this.marginAlignment,
    this.disableFocusOutline = false,
  });

  const Button.primary({
    super.key,
    this.statesController,
    this.leading,
    this.trailing,
    this.leadingGap,
    this.trailingGap,
    required this.child,
    this.onPressed,
    this.focusNode,
    this.alignment,
    this.enabled,
    this.style = const ButtonStyle.primary(),
    this.disableTransition = false,
    this.onFocus,
    this.onHover,
    this.disableHoverEffect = false,
    this.enableFeedback,
    this.onTapDown,
    this.onTapUp,
    this.onTapCancel,
    this.onSecondaryTapDown,
    this.onSecondaryTapUp,
    this.onSecondaryTapCancel,
    this.onTertiaryTapDown,
    this.onTertiaryTapUp,
    this.onTertiaryTapCancel,
    this.onLongPressStart,
    this.onLongPressUp,
    this.onLongPressMoveUpdate,
    this.onLongPressEnd,
    this.onSecondaryLongPress,
    this.onTertiaryLongPress,
    this.semanticLabel,
    this.semanticToggled,
    this.semanticSelected,
    this.marginAlignment,
    this.disableFocusOutline = false,
  });

  const Button.secondary({
    super.key,
    this.statesController,
    this.leading,
    this.trailing,
    this.leadingGap,
    this.trailingGap,
    required this.child,
    this.onPressed,
    this.focusNode,
    this.alignment,
    this.enabled,
    this.style = const ButtonStyle.secondary(),
    this.disableTransition = false,
    this.onFocus,
    this.onHover,
    this.disableHoverEffect = false,
    this.enableFeedback,
    this.onTapDown,
    this.onTapUp,
    this.onTapCancel,
    this.onSecondaryTapDown,
    this.onSecondaryTapUp,
    this.onSecondaryTapCancel,
    this.onTertiaryTapDown,
    this.onTertiaryTapUp,
    this.onTertiaryTapCancel,
    this.onLongPressStart,
    this.onLongPressUp,
    this.onLongPressMoveUpdate,
    this.onLongPressEnd,
    this.onSecondaryLongPress,
    this.onTertiaryLongPress,
    this.semanticLabel,
    this.semanticToggled,
    this.semanticSelected,
    this.marginAlignment,
    this.disableFocusOutline = false,
  });

  const Button.outline({
    super.key,
    this.statesController,
    this.leading,
    this.trailing,
    this.leadingGap,
    this.trailingGap,
    required this.child,
    this.onPressed,
    this.focusNode,
    this.alignment,
    this.enabled,
    this.style = const ButtonStyle.outline(),
    this.disableTransition = false,
    this.onFocus,
    this.onHover,
    this.disableHoverEffect = false,
    this.enableFeedback,
    this.onTapDown,
    this.onTapUp,
    this.onTapCancel,
    this.onSecondaryTapDown,
    this.onSecondaryTapUp,
    this.onSecondaryTapCancel,
    this.onTertiaryTapDown,
    this.onTertiaryTapUp,
    this.onTertiaryTapCancel,
    this.onLongPressStart,
    this.onLongPressUp,
    this.onLongPressMoveUpdate,
    this.onLongPressEnd,
    this.onSecondaryLongPress,
    this.onTertiaryLongPress,
    this.semanticLabel,
    this.semanticToggled,
    this.semanticSelected,
    this.marginAlignment,
    this.disableFocusOutline = false,
  });

  const Button.ghost({
    super.key,
    this.statesController,
    this.leading,
    this.trailing,
    this.leadingGap,
    this.trailingGap,
    required this.child,
    this.onPressed,
    this.focusNode,
    this.alignment,
    this.enabled,
    this.style = const ButtonStyle.ghost(),
    this.disableTransition = false,
    this.onFocus,
    this.onHover,
    this.disableHoverEffect = false,
    this.enableFeedback,
    this.onTapDown,
    this.onTapUp,
    this.onTapCancel,
    this.onSecondaryTapDown,
    this.onSecondaryTapUp,
    this.onSecondaryTapCancel,
    this.onTertiaryTapDown,
    this.onTertiaryTapUp,
    this.onTertiaryTapCancel,
    this.onLongPressStart,
    this.onLongPressUp,
    this.onLongPressMoveUpdate,
    this.onLongPressEnd,
    this.onSecondaryLongPress,
    this.onTertiaryLongPress,
    this.semanticLabel,
    this.semanticToggled,
    this.semanticSelected,
    this.marginAlignment,
    this.disableFocusOutline = false,
  });

  const Button.destructive({
    super.key,
    this.statesController,
    this.leading,
    this.trailing,
    this.leadingGap,
    this.trailingGap,
    required this.child,
    this.onPressed,
    this.focusNode,
    this.alignment,
    this.enabled,
    this.style = const ButtonStyle.destructive(),
    this.disableTransition = false,
    this.onFocus,
    this.onHover,
    this.disableHoverEffect = false,
    this.enableFeedback,
    this.onTapDown,
    this.onTapUp,
    this.onTapCancel,
    this.onSecondaryTapDown,
    this.onSecondaryTapUp,
    this.onSecondaryTapCancel,
    this.onTertiaryTapDown,
    this.onTertiaryTapUp,
    this.onTertiaryTapCancel,
    this.onLongPressStart,
    this.onLongPressUp,
    this.onLongPressMoveUpdate,
    this.onLongPressEnd,
    this.onSecondaryLongPress,
    this.onTertiaryLongPress,
    this.semanticLabel,
    this.semanticToggled,
    this.semanticSelected,
    this.marginAlignment,
    this.disableFocusOutline = false,
  });

  @override
  State<Button> createState() => _ButtonState();
}

class _ButtonState extends State<Button> {
  late FocusNode _focusNode;
  late WidgetStatesController _controller;
  bool _ownsFocusNode = false;
  bool _ownsController = false;

  bool get _shouldEnableFeedback {
    final theme = GarageTheme.of(context);
    if (theme.enableFeedback != null) return theme.enableFeedback!;
    return _isMobile(theme.platform);
  }

  bool get _enabled => widget.enabled ?? widget.onPressed != null;

  @override
  void initState() {
    super.initState();
    _focusNode = widget.focusNode ?? (FocusNode()..debugLabel = "Button");
    _ownsFocusNode = widget.focusNode == null;
    _controller = widget.statesController ?? WidgetStatesController();
    _ownsController = widget.statesController == null;
    _controller.update(WidgetState.disabled, !_enabled);
  }

  @override
  void didUpdateWidget(covariant Button oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (widget.statesController != oldWidget.statesController) {
      if (_ownsController) _controller.dispose();
      _controller = widget.statesController ?? WidgetStatesController();
      _ownsController = widget.statesController == null;
    }
    if (widget.focusNode != oldWidget.focusNode) {
      if (_ownsFocusNode) _focusNode.dispose();
      _focusNode = widget.focusNode ?? (FocusNode()..debugLabel = "Button");
      _ownsFocusNode = widget.focusNode == null;
    }
    _controller.update(WidgetState.disabled, !_enabled);
    if (widget.disableHoverEffect) {
      _controller.update(WidgetState.hovered, false);
    }
  }

  @override
  void dispose() {
    if (_ownsController) _controller.dispose();
    if (_ownsFocusNode) _focusNode.dispose();
    super.dispose();
  }

  // updating states while a build is in flight would assert, so defer to the
  // next frame in that case (same guard shadcn's Clickable uses).
  void _updateState(WidgetState state, bool value) {
    if (!mounted) return;
    if (SchedulerBinding.instance.schedulerPhase ==
        SchedulerPhase.persistentCallbacks) {
      SchedulerBinding.instance.addPostFrameCallback((_) {
        if (!mounted) return;
        _controller.update(state, value);
      });
      return;
    }
    _controller.update(state, value);
  }

  void _onPressed() {
    if (!_enabled || widget.onPressed == null) return;
    widget.onPressed!();
    final feedback = widget.enableFeedback ?? _shouldEnableFeedback;
    if (feedback && _isMobile(GarageTheme.of(context).platform)) {
      try {
        SystemSound.play(SystemSoundType.click);
      } catch (e, st) {
        // dont let a feedback hiccup swallow the tap — but do log it
        debugPrint("ana button feedback failed: $e\n$st");
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = GarageTheme.of(context);
    // controlGap, not baseGap - this is the leading/trailing icon to label gap
    // inside the button, so it matches what TextField uses.
    final densityGap = theme.density.controlGap;
    final enableFeedback = widget.enableFeedback ?? _shouldEnableFeedback;

    return ListenableBuilder(
      listenable: _controller,
      builder: (context, _) {
        final states = _controller.value;
        final style = widget.style;

        Decoration decoration = style.decoration(context, states);
        final group = ButtonGroupScope.maybeOf(context);
        if (group != null &&
            decoration is BoxDecoration &&
            decoration.shape != BoxShape.circle) {
          final merged = group.corners.applyTo(
            decoration.borderRadius ?? BorderRadius.zero,
            Directionality.of(context),
          );
          decoration = decoration.copyWith(borderRadius: merged);
          if (decoration.border case final Border border) {
            decoration = decoration.copyWith(
              border: group.mergedBorder(border, Directionality.of(context)),
            );
          }
        }

        final padding = style
            .padding(context, states)
            .resolve(Directionality.of(context));
        final textStyle = style.textStyle(context, states);
        final iconTheme = style.iconTheme(context, states);
        final cursor = style.mouseCursor(context, states);

        BorderRadiusGeometry borderRadius;
        BoxShape shape = BoxShape.rectangle;
        if (decoration is BoxDecoration) {
          borderRadius = decoration.borderRadius ?? theme.borderRadiusMd;
          shape = decoration.shape;
        } else {
          borderRadius = theme.borderRadiusMd;
        }

        // The compact control type is optically a pixel high when vertically
        // centred in its natural padding. Nudge direct text labels down without
        // affecting icon-only buttons or caller-composed layouts.
        final textOffset = theme.density.controlTextOffset;
        Widget content = widget.child is Text && textOffset != 0
            ? Transform.translate(
                offset: Offset(0, textOffset),
                child: widget.child,
              )
            : widget.child;
        if (widget.alignment != null) {
          content = Align(
            alignment: widget.alignment!,
            widthFactor: 1,
            heightFactor: 1,
            child: content,
          );
        }
        if (widget.leading != null || widget.trailing != null) {
          // exactly one side occupied, and the caller wants centred content:
          // the empty side gets an invisible copy to balance the row.
          //
          // squarePadding means the child is an icon rather than a label, so
          // there is no label to sit off centre - balancing one there just
          // hangs 15px of nothing off the side. thats how the snap targets
          // button (ruler + chevron) came out 52px wide for 38px of content.
          final bool balance =
              widget.alignment != null &&
              !style.squarePadding &&
              (widget.leading == null) != (widget.trailing == null);
          final bool mirrorLeading = balance && widget.leading == null;
          final bool mirrorTrailing = balance && widget.trailing == null;
          content = IntrinsicWidth(
            child: IntrinsicHeight(
              child: Row(
                mainAxisSize: MainAxisSize.min,
                // Keep the label at its own line-box height. Stretching it to
                // a taller leading/trailing icon changes the text's vertical
                // geometry and defeats the label-only optical offset above.
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  // A label in Expanded centres in the space LEFT OVER after
                  // the icon, not across the button - so one icon pushed the
                  // text off centre by half its own width plus the gap (7.5px
                  // at compact). An invisible, inert copy of that icon on the
                  // empty side makes the row symmetric, so the label lands on
                  // the real centre.
                  //
                  // Only when the caller asked for an alignment: a button with
                  // no alignment shrink-wraps its content and has no centre to
                  // miss, and padding it out would just make it wider.
                  // A plain spacer, not a copy of the widget: the leading and
                  // trailing slots stay pinned to their own edges, and
                  // reserving the same width on the empty side is what puts
                  // the label on the button's real centre. A duplicated widget
                  // would sit in the tree twice - which is exactly how the
                  // same trick broke a test that looked for one icon.
                  if (mirrorLeading) ...[
                    SizedBox(width: theme.iconTheme.small.size),
                    SizedBox(width: widget.trailingGap ?? densityGap),
                  ],

                  if (widget.leading != null) widget.leading!,
                  if (widget.leading != null)
                    SizedBox(width: widget.leadingGap ?? densityGap),

                  Expanded(child: content),

                  if (widget.trailing != null)
                    SizedBox(width: widget.trailingGap ?? densityGap),
                  if (widget.trailing != null) widget.trailing!,

                  if (mirrorTrailing) ...[
                    SizedBox(width: widget.leadingGap ?? densityGap),
                    SizedBox(width: theme.iconTheme.small.size),
                  ],
                ],
              ),
            ),
          );
        }

        // plain Container, not AnimatedContainer - no colour easing on
        // hover. The reference tool button was a plain Container and
        // TextField is instant too, so an eased button hover was the odd
        // one out. (widget.disableTransition is now redundant here.)
        Widget container = Container(
          decoration: decoration,
          padding: padding,
          child: content,
        );

        // press feedback (scale to 95%) only fires on platforms where feedback
        // is on — desktop/web leaves this a no-op, matching shadcn.
        if (enableFeedback) {
          container = AnimatedScale(
            duration: const Duration(milliseconds: 50),
            scale: states.contains(WidgetState.pressed) ? 0.95 : 1.0,
            child: container,
          );
        }

        Widget core = GestureDetector(
          behavior: HitTestBehavior.translucent,
          onTap: widget.onPressed != null ? _onPressed : null,
          onSecondaryTapDown: widget.onSecondaryTapDown,
          onSecondaryTapUp: widget.onSecondaryTapUp,
          onSecondaryTapCancel: widget.onSecondaryTapCancel,
          onTertiaryTapDown: widget.onTertiaryTapDown,
          onTertiaryTapUp: widget.onTertiaryTapUp,
          onTertiaryTapCancel: widget.onTertiaryTapCancel,
          onLongPressStart: widget.onLongPressStart,
          onLongPressUp: widget.onLongPressUp,
          onLongPressMoveUpdate: widget.onLongPressMoveUpdate,
          onLongPressEnd: widget.onLongPressEnd,
          onSecondaryLongPress: widget.onSecondaryLongPress,
          onTertiaryLongPress: widget.onTertiaryLongPress,
          onTapDown: widget.onPressed != null
              ? (details) {
                  if (enableFeedback) {
                    _updateState(WidgetState.hovered, true);
                  }
                  _updateState(WidgetState.pressed, true);
                  widget.onTapDown?.call(details);
                }
              : widget.onTapDown,
          onTapUp: widget.onPressed != null
              ? (details) {
                  if (enableFeedback) {
                    _updateState(WidgetState.hovered, false);
                  }
                  _updateState(WidgetState.pressed, false);
                  widget.onTapUp?.call(details);
                }
              : widget.onTapUp,
          onTapCancel: widget.onPressed != null
              ? () {
                  if (enableFeedback) {
                    _updateState(WidgetState.hovered, false);
                  }
                  _updateState(WidgetState.pressed, false);
                  widget.onTapCancel?.call();
                }
              : widget.onTapCancel,
          child: FocusableActionDetector(
            enabled: _enabled,
            focusNode: _focusNode,
            mouseCursor: cursor,
            shortcuts: {
              LogicalKeySet(LogicalKeyboardKey.enter): const ActivateIntent(),
              LogicalKeySet(LogicalKeyboardKey.space): const ActivateIntent(),
            },
            actions: {
              ActivateIntent: CallbackAction<ActivateIntent>(
                onInvoke: (e) {
                  _onPressed();
                  return null;
                },
              ),
            },
            onShowHoverHighlight: (value) {
              _updateState(
                WidgetState.hovered,
                value && !widget.disableHoverEffect,
              );
              widget.onHover?.call(value);
            },
            onShowFocusHighlight: (value) {
              _updateState(WidgetState.focused, value);
              widget.onFocus?.call(value);
            },
            child: DefaultTextStyle.merge(
              style: textStyle,
              // A button label is one line. Without this it wraps: a leading
              // icon takes width off the label's allowance, Expanded forces
              // the label to absorb the shortfall, and Text resolves that by
              // breaking - "Use" on line one and "passkey" on a second line
              // the button's height hides. It reads as a truncation but never
              // was one, which makes it very hard to chase from a screenshot.
              //
              // Overflowing visibly is the better failure: a label that runs
              // past its button is a bug you can see, not one that silently
              // eats half the word.
              maxLines: 1,
              softWrap: false,
              overflow: TextOverflow.visible,
              child: IconTheme.merge(data: iconTheme, child: container),
            ),
          ),
        );

        // one semantics node for the whole button. MergeSemantics folds the
        // label Text (and any leading/trailing icon that carries a label) into
        // it, so a screen reader reads the button once instead of walking its
        // internal layout. This is the single choke point for every button
        // variant in the app - Primary/Secondary/Outline/Ghost/Destructive/
        // Icon/Toggle all funnel through here, so don't add Semantics in those.
        return MergeSemantics(
          child: Semantics(
            container: true,
            button:
                widget.semanticToggled == null &&
                widget.semanticSelected == null,
            toggled: widget.semanticToggled,
            selected: widget.semanticSelected,
            inMutuallyExclusiveGroup: widget.semanticSelected != null
                ? true
                : null,
            enabled: _enabled,
            label: widget.semanticLabel,
            child: _FocusRing(
              focused:
                  states.contains(WidgetState.focused) &&
                  !widget.disableFocusOutline,
              borderRadius: borderRadius,
              shape: shape,
              child: core,
            ),
          ),
        );
      },
    );
  }
}

// focus outline — mirrors shadcn's FocusOutline (a 3px ring, ring colour at
// half alpha, offset 3px outside the bounds, animated in/out).
class _FocusRing extends StatelessWidget {
  final bool focused;
  final BorderRadiusGeometry borderRadius;
  final BoxShape shape;
  final Widget child;

  const _FocusRing({
    required this.focused,
    required this.borderRadius,
    required this.shape,
    required this.child,
  });

  BorderRadius _adjusted(TextDirection textDirection, double align) {
    final resolved = borderRadius.resolve(textDirection);
    return BorderRadius.only(
      topLeft: resolved.topLeft + Radius.circular(align),
      topRight: resolved.topRight + Radius.circular(align),
      bottomLeft: resolved.bottomLeft + Radius.circular(align),
      bottomRight: resolved.bottomRight + Radius.circular(align),
    );
  }

  @override
  Widget build(BuildContext context) {
    const align = 3.0;
    const offset = -align;
    final textDirection = Directionality.of(context);
    final ringColor = _scaleAlpha(
      GarageTheme.of(context).colorScheme.ring,
      0.5,
    );
    return Stack(
      clipBehavior: Clip.none,
      fit: StackFit.passthrough,
      children: [
        child,
        TweenAnimationBuilder<double>(
          tween: Tween<double>(end: focused ? 1.0 : 0.0),
          duration: kDefaultDuration,
          builder: (context, value, _) {
            return Positioned(
              top: offset * value,
              right: offset * value,
              bottom: offset * value,
              left: offset * value,
              child: IgnorePointer(
                child: Container(
                  decoration: BoxDecoration(
                    borderRadius: shape != BoxShape.circle
                        ? _adjusted(textDirection, align)
                        : null,
                    shape: shape,
                    border: Border.all(
                      color: ringColor,
                      width: 3.0,
                    ).scale(value),
                  ),
                ),
              ),
            );
          },
        ),
      ],
    );
  }
}

// ---------------------------------------------------------------------------
// convenience variant widgets
// ---------------------------------------------------------------------------

/// primary button (filled, prominent).
class PrimaryButton extends StatelessWidget {
  final Widget child;
  final VoidCallback? onPressed;
  final bool? enabled;
  final Widget? leading;
  final Widget? trailing;
  final AlignmentGeometry? alignment;
  final ButtonSize size;
  final ControlDensity? density;
  final ButtonShape shape;
  final FocusNode? focusNode;
  final bool disableTransition;
  final ValueChanged<bool>? onHover;
  final ValueChanged<bool>? onFocus;
  final bool? enableFeedback;
  final String? semanticLabel;

  const PrimaryButton({
    super.key,
    required this.child,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
  });

  @override
  Widget build(BuildContext context) {
    return Button(
      onPressed: onPressed,
      enabled: enabled,
      leading: leading,
      trailing: trailing,
      alignment: alignment,
      style: ButtonStyle.primary(size: size, density: density, shape: shape),
      focusNode: focusNode,
      disableTransition: disableTransition,
      onHover: onHover,
      onFocus: onFocus,
      enableFeedback: enableFeedback,
      semanticLabel: semanticLabel,
      child: child,
    );
  }
}

/// secondary button (muted background).
class SecondaryButton extends StatelessWidget {
  final Widget child;
  final VoidCallback? onPressed;
  final bool? enabled;
  final Widget? leading;
  final Widget? trailing;
  final AlignmentGeometry? alignment;
  final ButtonSize size;
  final ControlDensity? density;
  final ButtonShape shape;
  final FocusNode? focusNode;
  final bool disableTransition;
  final ValueChanged<bool>? onHover;
  final ValueChanged<bool>? onFocus;
  final bool? enableFeedback;
  final String? semanticLabel;

  const SecondaryButton({
    super.key,
    required this.child,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
  });

  @override
  Widget build(BuildContext context) {
    return Button(
      onPressed: onPressed,
      enabled: enabled,
      leading: leading,
      trailing: trailing,
      alignment: alignment,
      style: ButtonStyle.secondary(size: size, density: density, shape: shape),
      focusNode: focusNode,
      disableTransition: disableTransition,
      onHover: onHover,
      onFocus: onFocus,
      enableFeedback: enableFeedback,
      semanticLabel: semanticLabel,
      child: child,
    );
  }
}

/// outline button (border, transparent-ish fill).
class OutlineButton extends StatelessWidget {
  final Widget child;
  final VoidCallback? onPressed;
  final bool? enabled;
  final Widget? leading;
  final Widget? trailing;
  final AlignmentGeometry? alignment;
  final ButtonSize size;
  final ControlDensity? density;
  final ButtonShape shape;
  final FocusNode? focusNode;
  final bool disableTransition;
  final ValueChanged<bool>? onHover;
  final ValueChanged<bool>? onFocus;
  final bool? enableFeedback;
  final String? semanticLabel;

  const OutlineButton({
    super.key,
    required this.child,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
  });

  @override
  Widget build(BuildContext context) {
    return Button(
      onPressed: onPressed,
      enabled: enabled,
      leading: leading,
      trailing: trailing,
      alignment: alignment,
      style: ButtonStyle.outline(size: size, density: density, shape: shape),
      focusNode: focusNode,
      disableTransition: disableTransition,
      onHover: onHover,
      onFocus: onFocus,
      enableFeedback: enableFeedback,
      semanticLabel: semanticLabel,
      child: child,
    );
  }
}

/// ghost button (no fill until hovered).
class GhostButton extends StatelessWidget {
  final Widget child;
  final VoidCallback? onPressed;
  final bool? enabled;
  final Widget? leading;
  final Widget? trailing;
  final AlignmentGeometry? alignment;
  final ButtonSize size;
  final ControlDensity? density;
  final ButtonShape shape;
  final FocusNode? focusNode;
  final bool disableTransition;
  final ValueChanged<bool>? onHover;
  final ValueChanged<bool>? onFocus;
  final bool? enableFeedback;
  final String? semanticLabel;

  const GhostButton({
    super.key,
    required this.child,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
  });

  @override
  Widget build(BuildContext context) {
    return Button(
      onPressed: onPressed,
      enabled: enabled,
      leading: leading,
      trailing: trailing,
      alignment: alignment,
      style: ButtonStyle.ghost(size: size, density: density, shape: shape),
      focusNode: focusNode,
      disableTransition: disableTransition,
      onHover: onHover,
      onFocus: onFocus,
      enableFeedback: enableFeedback,
      semanticLabel: semanticLabel,
      child: child,
    );
  }
}

/// destructive button (red, for delete/remove).
class DestructiveButton extends StatelessWidget {
  final Widget child;
  final VoidCallback? onPressed;
  final bool? enabled;
  final Widget? leading;
  final Widget? trailing;
  final AlignmentGeometry? alignment;
  final ButtonSize size;
  final ControlDensity? density;
  final ButtonShape shape;
  final FocusNode? focusNode;
  final bool disableTransition;
  final ValueChanged<bool>? onHover;
  final ValueChanged<bool>? onFocus;
  final bool? enableFeedback;
  final String? semanticLabel;

  const DestructiveButton({
    super.key,
    required this.child,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
  });

  @override
  Widget build(BuildContext context) {
    return Button(
      onPressed: onPressed,
      enabled: enabled,
      leading: leading,
      trailing: trailing,
      alignment: alignment,
      style: ButtonStyle.destructive(
        size: size,
        density: density,
        shape: shape,
      ),
      focusNode: focusNode,
      disableTransition: disableTransition,
      onHover: onHover,
      onFocus: onFocus,
      enableFeedback: enableFeedback,
      semanticLabel: semanticLabel,
      child: child,
    );
  }
}

/// icon-only button. defaults to square (icon) density. use the named
/// constructors for a specific variance (.primary/.secondary/.outline/etc).
class IconButton extends StatelessWidget {
  final Widget icon;
  final VoidCallback? onPressed;
  final bool? enabled;
  final Widget? leading;
  final Widget? trailing;
  final AlignmentGeometry? alignment;
  final ButtonSize size;
  final ControlDensity? density;
  final ButtonShape shape;
  final FocusNode? focusNode;
  final bool disableTransition;
  final ValueChanged<bool>? onHover;
  final ValueChanged<bool>? onFocus;
  final bool? enableFeedback;
  final String? semanticLabel;
  final AbstractButtonStyle variance;

  const IconButton({
    super.key,
    required this.icon,
    required this.variance,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.density,
    this.shape = ButtonShape.rectangle,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
  });

  const IconButton.primary({
    super.key,
    required this.icon,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
    this.variance = ButtonVariance.primary,
    this.density,
    this.shape = ButtonShape.rectangle,
  });

  const IconButton.secondary({
    super.key,
    required this.icon,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
    this.variance = ButtonVariance.secondary,
    this.density,
    this.shape = ButtonShape.rectangle,
  });

  const IconButton.outline({
    super.key,
    required this.icon,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
    this.variance = ButtonVariance.outline,
    this.density,
    this.shape = ButtonShape.rectangle,
  });

  const IconButton.ghost({
    super.key,
    required this.icon,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
    this.variance = ButtonVariance.ghost,
    this.density,
    this.shape = ButtonShape.rectangle,
  });

  const IconButton.destructive({
    super.key,
    required this.icon,
    this.onPressed,
    this.enabled,
    this.leading,
    this.trailing,
    this.alignment,
    this.size = ButtonSize.normal,
    this.focusNode,
    this.disableTransition = false,
    this.onHover,
    this.onFocus,
    this.enableFeedback,
    this.semanticLabel,
    this.variance = ButtonVariance.destructive,
    this.density,
    this.shape = ButtonShape.rectangle,
  });

  @override
  Widget build(BuildContext context) {
    return Button(
      onPressed: onPressed,
      enabled: enabled,
      leading: leading,
      trailing: trailing,
      // centered by default - with compact density (zero padding) an
      // unaligned icon lands top-left the moment anything stretches the box
      // (e.g. an AspectRatio around it). the explorer tool button this style
      // comes from wrapped its icon in a Center for exactly this reason.
      alignment: alignment ?? Alignment.center,
      style: ButtonStyle(
        variance: variance,
        size: size,
        density: density,
        shape: shape,
        // an icon-only button is always square, whatever density its handed.
        // the control padding is asymmetric (6 across, 2 down), so without
        // this a 14px icon comes out a 28x20 rectangle.
        squarePadding: true,
      ),
      focusNode: focusNode,
      disableTransition: disableTransition,
      onHover: onHover,
      onFocus: onFocus,
      enableFeedback: enableFeedback,
      semanticLabel: semanticLabel,
      child: icon,
    );
  }
}

// ---------------------------------------------------------------------------
// toggle (a ghost button that flips to secondary when on)
// ---------------------------------------------------------------------------

/// a pressable on/off button. shows [ButtonStyle.secondary] while on, and the
/// given [style] (ghost by default) while off — matching shadcn's Toggle.
class Toggle extends StatefulWidget {
  final bool value;
  final ValueChanged<bool>? onChanged;
  final Widget child;
  final ButtonStyle style;
  final bool? enabled;
  final String? semanticLabel;

  const Toggle({
    super.key,
    required this.value,
    this.onChanged,
    required this.child,
    this.enabled,
    this.semanticLabel,
    this.style = const ButtonStyle.ghost(),
  });

  @override
  State<Toggle> createState() => _ToggleState();
}

class _ToggleState extends State<Toggle> {
  final WidgetStatesController statesController = WidgetStatesController();

  @override
  void initState() {
    super.initState();
    statesController.update(WidgetState.selected, widget.value);
  }

  @override
  void didUpdateWidget(covariant Toggle oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.value != widget.value) {
      statesController.update(WidgetState.selected, widget.value);
    }
  }

  @override
  void dispose() {
    statesController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Button(
      statesController: statesController,
      enabled: widget.enabled,
      style: widget.value
          ? ButtonStyle.secondary(
              density: widget.style.density,
              shape: widget.style.shape,
              size: widget.style.size,
            )
          : widget.style.copyWith(
              textStyle: (context, states, value) {
                final theme = GarageTheme.of(context);
                return value.copyWith(
                  color: states.contains(WidgetState.hovered)
                      ? theme.colorScheme.mutedForeground
                      : null,
                );
              },
              iconTheme: (context, states, value) {
                final theme = GarageTheme.of(context);
                return value.copyWith(
                  color: states.contains(WidgetState.hovered)
                      ? theme.colorScheme.mutedForeground
                      : null,
                );
              },
            ),
      onPressed: widget.onChanged != null
          ? () => widget.onChanged!(!widget.value)
          : null,
      semanticLabel: widget.semanticLabel,
      semanticToggled: widget.value,
      child: widget.child,
    );
  }
}

// ---------------------------------------------------------------------------
// button group — lays buttons out in a row/column with merged inner corners
// ---------------------------------------------------------------------------

/// arranges buttons in a row (default) or column, zeroing the touching corners
/// so they read as one connected control.
class ButtonGroup extends StatelessWidget {
  final Axis direction;
  final List<Widget> children;

  /// Let the CROSS axis be governed by the parent instead of the children.
  ///
  /// A horizontal group normally takes its height from its tallest button, a
  /// vertical one its width from its widest; this drops that and fills the
  /// parent instead. Only safe where the parent actually bounds that axis -
  /// a horizontal group with `expands` inside a row that has no height sizes
  /// its buttons to nothing, which is a pile of "Cannot hit test a render box
  /// with no size" rather than a layout you can look at.
  ///
  /// It has nothing to do with the main axis. For that, see [fill].
  final bool expands;

  /// Span the MAIN axis, with every child taking an equal share of it.
  ///
  /// For segmented controls - Off / Optional / Required - which shrink to
  /// their labels otherwise, so "Off" comes out a third the width of
  /// "Required" and the rest of the field is empty. A segmented control that
  /// doesnt span its field reads as three buttons that happen to be touching.
  ///
  /// Buttons left align their label once theyre wider than it needs, so pass
  /// `alignment: Alignment.center` on the children as well.
  final bool fill;

  const ButtonGroup({
    super.key,
    this.direction = Axis.horizontal,
    this.expands = false,
    this.fill = false,
    required this.children,
  });

  const ButtonGroup.horizontal({
    super.key,
    this.expands = false,
    this.fill = false,
    required this.children,
  }) : direction = Axis.horizontal;

  const ButtonGroup.vertical({
    super.key,
    this.expands = false,
    this.fill = false,
    required this.children,
  }) : direction = Axis.vertical;

  @override
  Widget build(BuildContext context) {
    // an enclosing group, if this one is nested inside another. its say gets
    // folded into every child's rather than shadowed - without this the inner
    // group's scope simply hides the outer one and the seam between the two
    // rows comes back as a doubled stroke with rounded corners in the middle.
    final outer = ButtonGroupScope.maybeOf(context);

    List<Widget> kids = List.from(children);
    if (kids.length > 1) {
      for (int i = 0; i < kids.length; i++) {
        final own = direction == Axis.horizontal
            ? ButtonGroupCorners.horizontalIndex(i, kids.length)
            : ButtonGroupCorners.verticalIndex(i, kids.length);
        kids[i] = ButtonGroupScope(
          corners: outer == null ? own : outer.corners.merge(own),
          hideTop:
              (direction == Axis.vertical && i > 0) ||
              (outer?.hideTop ?? false),
          hideStart:
              (direction == Axis.horizontal && i > 0) ||
              (outer?.hideStart ?? false),
          child: kids[i],
        );
      }
    }
    if (fill) {
      // wrapped HERE, after the corner-hiding wrappers, so each child keeps
      // the seam treatment its position earned and only its share of the
      // main axis changes.
      for (var i = 0; i < kids.length; i++) {
        kids[i] = Expanded(child: kids[i]);
      }
    }
    Widget flex = Flex(
      clipBehavior: Clip.none,
      mainAxisSize: MainAxisSize.min,
      direction: direction,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: kids,
    );
    if (!expands) {
      flex = direction == Axis.horizontal
          ? IntrinsicHeight(child: flex)
          : IntrinsicWidth(child: flex);
    }
    return flex;
  }
}