feat: add complete light and dark presets

src/lib/theme-contrast.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 import { contrastRatio, derivePublicForegrounds, readableColor } from "@/lib/theme-contrast";
-import { PRESETS } from "@/lib/theme-presets";
+import { PRESETS, THEME_COLOR_KEYS } from "@/lib/theme-presets";
 
 describe("contrastRatio", () => {
   it("calculates the WCAG ratio for black on white", () => {
@@ -13,14 +13,24 @@ describe("contrastRatio", () => {
 });
 
 describe("built-in theme presets", () => {
+  it("defines every theme color in light and dark mode", () => {
+    for (const preset of Object.values(PRESETS)) {
+      expect(Object.keys(preset).sort()).toEqual(["dark", "light"]);
+      for (const palette of [preset.light, preset.dark]) {
+        expect(Object.keys(palette).sort()).toEqual([...THEME_COLOR_KEYS].sort());
+      }
+    }
+  });
+
   it("derives WCAG-readable public foregrounds for every palette", () => {
     for (const preset of Object.values(PRESETS)) {
-      const backgrounds = [preset.color_background, preset.color_surface];
+      for (const palette of [preset.light, preset.dark]) {
+        const backgrounds = [palette.color_background, palette.color_surface];
         const foregrounds = [
-        readableColor(preset.color_text, backgrounds),
+          readableColor(palette.color_text, backgrounds),
-        readableColor(preset.color_text_muted, backgrounds),
+          readableColor(palette.color_text_muted, backgrounds),
-        readableColor(preset.color_primary, backgrounds),
+          readableColor(palette.color_primary, backgrounds),
-        readableColor(preset.color_accent, backgrounds),
+          readableColor(palette.color_accent, backgrounds),
         ];
 
         for (const foreground of foregrounds) {
@@ -29,11 +39,12 @@ describe("built-in theme presets", () => {
           }
         }
 
-      const buttonText = readableColor(preset.button_text_color, [preset.button_primary_color]);
+        const buttonText = readableColor(palette.button_text_color, [palette.button_primary_color]);
-      expect(contrastRatio(buttonText, preset.button_primary_color)).toBeGreaterThanOrEqual(4.5);
+        expect(contrastRatio(buttonText, palette.button_primary_color)).toBeGreaterThanOrEqual(4.5);
 
-      const primaryForeground = readableColor(preset.button_text_color, [preset.color_primary]);
+        const primaryForeground = readableColor(palette.button_text_color, [palette.color_primary]);
-      expect(contrastRatio(primaryForeground, preset.color_primary)).toBeGreaterThanOrEqual(4.5);
+        expect(contrastRatio(primaryForeground, palette.color_primary)).toBeGreaterThanOrEqual(4.5);
+      }
     }
   });
 
@@ -67,10 +78,12 @@ describe("readableColor", () => {
 
 describe("derivePublicForegrounds", () => {
   it.each(Object.entries(PRESETS))("makes every semantic pair readable for %s", (_name, preset) => {
-    const result = derivePublicForegrounds(preset);
+    for (const palette of [preset.light, preset.dark]) {
+      const result = derivePublicForegrounds(palette);
       for (const pair of result.pairs) {
         expect(contrastRatio(pair.foreground, pair.background), pair.name).toBeGreaterThanOrEqual(4.5);
       }
+    }
   });
 
   it("repairs hostile white-on-white custom colors", () => {

src/lib/theme-presets.ts

@@ -42,12 +42,27 @@ export const THEME_COLOR_KEYS = [
   "color_info",
   "button_primary_color",
   "button_text_color",
+  "button_secondary_color",
+  "button_secondary_text_color",
+  "button_danger_color",
+  "button_danger_text_color",
+  "button_outline_color",
+  "button_outline_text_color",
+  "link_color",
+  "link_hover_color",
   "border_color",
+  "gradient_from",
+  "gradient_to",
 ] as const;
 
+export type ThemeMode = "light" | "dark";
+export type ThemeColorKey = (typeof THEME_COLOR_KEYS)[number];
+export type ThemePalette = Record<ThemeColorKey, string>;
+export type ThemePreset = Record<ThemeMode, ThemePalette>;
+
 // Curated palettes (faithful to the atom theme presets). Each is a full set of
 // the colour keys above so applying one fully reskins the site.
-export const PRESETS: Record<string, Record<string, string>> = {
+const LEGACY_PALETTES: Record<string, Partial<ThemePalette>> = {
   "Atom (golden)": {
     color_primary: "#f59e0b",
     color_background: "#f8fafc",
@@ -301,3 +316,64 @@ export const PRESETS: Record<string, Record<string, string>> = {
     border_color: "#e8a33d",
   },
 };
+
+const LIGHT_BASE: ThemePalette = {
+  color_primary: "#f59e0b", color_background: "#f8fafc", color_surface: "#ffffff",
+  color_dropdown: "#ffffff", color_navbar: "#ffffff", color_navbar_text: "#1e293b",
+  color_text: "#0f172a", color_text_muted: "#64748b", color_accent: "#10b981",
+  color_success: "#16a34a", color_warning: "#eab308", color_error: "#ef4444",
+  color_info: "#0ea5e9", button_primary_color: "#f59e0b", button_text_color: "#1e293b",
+  button_secondary_color: "#22c55e", button_secondary_text_color: "#ffffff",
+  button_danger_color: "#ef4444", button_danger_text_color: "#ffffff",
+  button_outline_color: "#eeb425", button_outline_text_color: "#1a1a2e",
+  link_color: "#b77900", link_hover_color: "#8a5b00", border_color: "#eeb425",
+  gradient_from: "#f59e0b", gradient_to: "#10b981",
+};
+
+const DARK_BASE: ThemePalette = {
+  ...LIGHT_BASE,
+  color_background: "#0b0d14", color_surface: "#141820", color_dropdown: "#1d222b",
+  color_navbar: "#141820", color_navbar_text: "#e5e7eb", color_text: "#e5e7eb",
+  color_text_muted: "#94a3b8", button_text_color: "#0b0d14",
+  button_secondary_text_color: "#08130b", button_danger_text_color: "#160606",
+  button_outline_text_color: "#f8fafc", link_color: "#f6c453", link_hover_color: "#ffe08a",
+};
+
+const DARK_FIRST = new Set(["Midnight", "Galaxy", "Cyberpunk", "Neon", "Dusk"]);
+
+function brandValues(source: Partial<ThemePalette>): Partial<ThemePalette> {
+  return {
+    color_primary: source.color_primary,
+    color_accent: source.color_accent,
+    color_success: source.color_success,
+    color_warning: source.color_warning,
+    color_error: source.color_error,
+    color_info: source.color_info,
+    button_primary_color: source.button_primary_color ?? source.color_primary,
+    border_color: source.border_color ?? source.color_primary,
+    gradient_from: source.color_primary,
+    gradient_to: source.color_accent,
+    button_outline_color: source.border_color ?? source.color_primary,
+  };
+}
+
+function completePalette(base: ThemePalette, values: Partial<ThemePalette>): ThemePalette {
+  const merged = { ...base, ...values };
+  merged.button_secondary_color = values.button_secondary_color ?? merged.color_accent;
+  merged.button_outline_color = values.button_outline_color ?? merged.border_color;
+  merged.gradient_from = values.gradient_from ?? merged.color_primary;
+  merged.gradient_to = values.gradient_to ?? merged.color_accent;
+  return merged;
+}
+
+export const PRESETS: Record<string, ThemePreset> = Object.fromEntries(
+  Object.entries(LEGACY_PALETTES).map(([name, palette]) => {
+    const light = DARK_FIRST.has(name)
+      ? completePalette(LIGHT_BASE, brandValues(palette))
+      : completePalette(LIGHT_BASE, palette);
+    const dark = DARK_FIRST.has(name)
+      ? completePalette(DARK_BASE, palette)
+      : completePalette(DARK_BASE, brandValues(palette));
+    return [name, { light, dark } satisfies ThemePreset];
+  }),
+);