// Dumps the real theme values out to design_system/, so the design system
// never has to be typed out by hand (and never drifts from the package).
//
//   cd garage_ui && flutter test tool/export_design_tokens_test.dart
//
// its a "test" only because thats the easiest way to get a flutter binding
// without an app. it writes files, it doesnt assert anything interesting.

import "dart:convert";
import "dart:io";

import "package:flutter/widgets.dart";
import "package:flutter_test/flutter_test.dart";
import "package:garage_ui/theme.dart";

String _hex(Color c) {
  final argb = c.toARGB32();
  final a = (argb >> 24) & 0xff;
  final rgb = (argb & 0xffffff).toRadixString(16).padLeft(6, "0");
  if (a == 0xff) return "#$rgb";
  return "#$rgb${a.toRadixString(16).padLeft(2, "0")}";
}

Map<String, String> _colours(ColourScheme s) => {
      "background": _hex(s.background),
      "foreground": _hex(s.foreground),
      "chrome": _hex(s.chrome),
      "surface-sunken": _hex(s.surfaceSunken),
      "card": _hex(s.card),
      "muted": _hex(s.muted),
      "muted-foreground": _hex(s.mutedForeground),
      "row-text": _hex(s.rowText),
      "row-hovered": _hex(s.rowHovered),
      "popover": _hex(s.popover),
      "popover-border": _hex(s.popoverBorder),
      "popover-item-hovered": _hex(s.popoverItemHovered),
      "tooltip-background": _hex(s.tooltipBackground),
      "tooltip-border": _hex(s.tooltipBorder),
      "primary": _hex(s.primary),
      "primary-hovered": _hex(s.primaryHovered),
      "primary-foreground": _hex(s.primaryForeground),
      "secondary": _hex(s.secondary),
      "secondary-hovered": _hex(s.secondaryHovered),
      "secondary-foreground": _hex(s.secondaryForeground),
      "destructive": _hex(s.destructive),
      "control-fill": _hex(s.controlFill),
      "control-fill-hovered": _hex(s.controlFillHovered),
      "control-fill-focused": _hex(s.controlFillFocused),
      "control-border": _hex(s.controlBorder),
      "switch-track-inactive": _hex(s.switchTrackInactive),
      "border": _hex(s.border),
      "divider": _hex(s.divider),
      "panel-border": _hex(s.panelBorder),
      "panel-border-highlighted": _hex(s.panelBorderHighlighted),
      "properties-section-border": _hex(s.propertiesSectionBorder),
      "ring": _hex(s.ring),
      "chart-1": _hex(s.chart1),
      "chart-2": _hex(s.chart2),
      "chart-3": _hex(s.chart3),
      "chart-4": _hex(s.chart4),
      "chart-5": _hex(s.chart5),
    };

Map<String, num> _density(Density d) {
  final t = ThemeData(colorScheme: GarageSchemes.carbon, density: d);
  return {
    "font-size": d.fontSize,
    "line-height": d.lineHeight,
    "line-box": d.lineBox,
    "control-height": d.controlHeight,
    "control-padding-x": d.buttonPaddingX,
    "control-padding-y": d.controlPaddingY,
    "control-gap": d.controlGap,
    "control-border-width": d.controlBorderWidth,
    "menu-row-height": d.menuRowHeight,
    "popup-row-height": d.popupRowHeight,
    "explorer-row-height": d.explorerRowHeight,
    "chrome-bar-height": d.chromeBarHeight,
    "property-row-height": d.propertyRowHeight,
    // the label + subtitle stack a SettingsRow is sized off
    "label-column-height": d.labelColumnHeight,
    "properties-section-gap": d.propertiesSectionGap,
    "explorer-row-base-padding": d.explorerRowBasePadding,
    "explorer-row-end-padding": d.explorerRowEndPadding,
    "list-row-indent": d.listRowIndent,
    "container-gap": d.containerGap,
    "container-padding": d.containerPadding,
    "gap-xxs": d.gapXxs,
    "gap-xs": d.gapXs,
    "gap-sm": d.gapSm,
    "gap-md": d.gapMd,
    "gap-lg": d.gapLg,
    "gap-xl": d.gapXl,
    "gap-xxl": d.gapXxl,
    "text-xxs": d.textXxs,
    "text-xs": d.textXs,
    "text-sm": d.textSm,
    "text-lg": d.textLg,
    "icon-sm": t.iconTheme.small.size ?? d.iconSize,
    "icon-md": t.iconTheme.medium.size ?? 20,
    "icon-lg": t.iconTheme.large.size ?? 24,
  };
}

String _num(num n) => n == n.roundToDouble() ? n.round().toString() : n.toString();

void main() {
  test("export design tokens", () {
    final out = Directory("../design_system");
    out.createSync(recursive: true);

    final t = ThemeData(colorScheme: GarageSchemes.carbon);

    final schemes = {
      "carbon": _colours(GarageSchemes.carbon),
      "dark": _colours(GarageSchemes.dark),
      "light": _colours(GarageSchemes.light),
    };
    final densities = {
      "compact": _density(const Density.compact()),
      "normal": _density(const Density.normal()),
      "product": _density(const Density.product()),
    };
    final shape = {
      "radius-xs": t.radiusXs,
      "radius-sm": t.radiusSm,
      "radius-md": t.radiusMd,
      "radius-lg": t.radiusLg,
      "radius-xl": t.radiusXl,
      "radius-xxl": t.radiusXxl,
      "panel-radius": t.panelRadius,
      "panel-gap": t.panelGap,
      "panel-border-width": 1.15,
      "property-split": 0.4,
      "property-label-gap": 10,
      "dialog-max-width": 350,
    };

    File("${out.path}/tokens.json").writeAsStringSync(
      const JsonEncoder.withIndent("  ").convert({
        "_generated": "by garage_ui/tool/export_design_tokens_test.dart - dont edit by hand",
        "fonts": {"sans": "Geist", "mono": "Geist Mono"},
        "weights": {"body": 300, "control": 400, "medium": 500, "semibold": 600},
        "schemes": schemes,
        "densities": densities,
        "shape": shape,
      }),
    );

    final css = StringBuffer()
      ..writeln("/* garage_ui design tokens. Generated by garage_ui/tool/export_design_tokens_test.dart")
      ..writeln("   - dont edit by hand, rerun the export.")
      ..writeln("   Scheme:  data-scheme=\"carbon\" (default) | \"dark\" | \"light\"")
      ..writeln("   Density: data-density=\"product\" (default) | \"normal\" | \"compact\" */")
      ..writeln()
      ..writeln("@import url(\"https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600;700&family=Geist+Mono:wght@400;500&display=swap\");")
      ..writeln();

    void block(String selector, Map<String, String> vars) {
      css.writeln("$selector {");
      vars.forEach((k, v) => css.writeln("  --$k: $v;"));
      css.writeln("}");
      css.writeln();
    }

    block(":root", {
      "font-sans": "\"Geist\", system-ui, sans-serif",
      "font-mono": "\"Geist Mono\", ui-monospace, monospace",
      "weight-body": "300",
      "weight-control": "400",
      "weight-medium": "500",
      "weight-semibold": "600",
      for (final e in shape.entries)
        e.key: (e.key == "property-split") ? _num(e.value) : "${_num(e.value)}px",
    });

    schemes.forEach((name, vars) {
      final sel = name == "carbon" ? ":root, [data-scheme=\"carbon\"]" : "[data-scheme=\"$name\"]";
      block(sel, vars);
    });

    // the default block has to come FIRST. `:root` and `[data-density=x]` are
    // the same specificity, so whichever is later wins - with product last,
    // <html data-density="compact"> quietly rendered product
    final densityOrder = ["product", "compact", "normal"];
    for (final name in densityOrder) {
      final vars = densities[name]!;
      final sel = name == "product" ? ":root, [data-density=\"product\"]" : "[data-density=\"$name\"]";
      block(sel, {
        for (final e in vars.entries)
          e.key: e.key == "line-height" ? _num(e.value) : "${_num(e.value)}px",
      });
    }

    File("${out.path}/tokens.css").writeAsStringSync(css.toString());
  });
}