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import { THEMES, THEME_IDS, DEFAULT_THEME_ID, getThemeById } from "../themes.js";
import type { ThemeDefinition } from "../themes.js";
interface ThemeSnapshot {
themeId: string;
systemDark: boolean;
preferSystem: boolean;
}
const STORAGE_KEY: string = "grackle-theme";
const PREFER_SYSTEM_KEY: string = "grackle-prefer-system";
const MEDIA_QUERY: string = "(prefers-color-scheme: dark)";
let listeners: Array<() => void> = [];
let lastSnapshot: ThemeSnapshot | undefined = undefined;
/** Notify all subscribers of a state change. */
function emitChange(): void {
lastSnapshot = undefined;
for (const listener of listeners) {
listener();
}
}
/** Check whether the OS prefers dark mode. */
function getSystemDark(): boolean {
Iif (typeof window === "undefined") {
return false;
}
return window.matchMedia(MEDIA_QUERY).matches;
}
/** Read the persisted theme ID from localStorage, defaulting to the registry default. */
function getStored(): string {
Iif (typeof localStorage === "undefined") {
return DEFAULT_THEME_ID;
}
try {
const raw: string | null = localStorage.getItem(STORAGE_KEY);
Iif (raw !== null && THEME_IDS.has(raw)) {
return raw;
}
} catch {
// localStorage may be unavailable
}
return DEFAULT_THEME_ID;
}
/** Read the persisted prefer-system flag from localStorage. */
function getPreferSystem(): boolean {
Iif (typeof localStorage === "undefined") {
return false;
}
try {
return localStorage.getItem(PREFER_SYSTEM_KEY) === "true";
} catch {
return false;
}
}
/** Find the parent theme for a hidden variant ID (e.g., "grackle-dark" → Grackle). */
function findParentTheme(variantId: string): ThemeDefinition | undefined {
return THEMES.find((t) => t.variantLightId === variantId || t.variantDarkId === variantId);
}
/** Resolve a theme ID to the data-theme attribute value applied to the document. */
function resolveDataTheme(themeId: string, preferSystem: boolean): string {
const def = getThemeById(themeId);
// Parent theme with variants → resolve to light or dark
if (def?.variantDarkId) {
Iif (preferSystem && def.variantLightId) {
return getSystemDark() ? def.variantDarkId : def.variantLightId;
}
return def.variantDarkId;
}
// Concrete variant ID (e.g., "grackle-dark") — if preferSystem, resolve via parent
Iif (def?.hidden && preferSystem) {
const parent = findParentTheme(themeId);
Iif (parent?.variantLightId && parent.variantDarkId) {
return getSystemDark() ? parent.variantDarkId : parent.variantLightId;
}
}
return themeId;
}
/** Apply the resolved theme to the document root element. */
function applyTheme(
themeId: string,
preferSystem: boolean,
suppressTransitions: boolean = false,
): void {
Iif (suppressTransitions) {
document.documentElement.classList.add("no-transitions");
}
document.documentElement.dataset.theme = resolveDataTheme(themeId, preferSystem);
Iif (suppressTransitions) {
// Force a reflow so the no-transitions class takes effect before removal
// eslint-disable-next-line no-unused-expressions
document.documentElement.offsetHeight;
requestAnimationFrame(() => {
document.documentElement.classList.remove("no-transitions");
});
}
}
// Apply immediately on module load to prevent flash of wrong theme
if (typeof document !== "undefined") {
applyTheme(getStored(), getPreferSystem());
}
/** Build the current snapshot for useSyncExternalStore. */
function getSnapshot(): ThemeSnapshot {
if (lastSnapshot === undefined) {
lastSnapshot = {
themeId: getStored(),
systemDark: getSystemDark(),
preferSystem: getPreferSystem(),
};
}
return lastSnapshot;
}
/** Subscribe to snapshot changes. */
function subscribe(listener: () => void): () => void {
listeners = [...listeners, listener];
return () => {
listeners = listeners.filter((l) => l !== listener);
};
}
/** Result shape for the useTheme hook. */
export interface UseThemeResult {
/** The user's chosen theme ID. */
themeId: string;
/** The actually-applied data-theme value after resolving system preference. */
resolvedThemeId: string;
/** Set a new theme by ID. */
setTheme: (nextId: string) => void;
/** Whether the theme follows the OS light/dark preference. */
preferSystem: boolean;
/** Toggle the OS preference auto-switch behavior. */
setPreferSystem: (prefer: boolean) => void;
}
/** React hook for reading and setting the application theme. */
export function useTheme(): UseThemeResult {
const snapshot = useSyncExternalStore(subscribe, getSnapshot);
const { themeId, preferSystem } = snapshot;
const resolvedThemeId: string = resolveDataTheme(themeId, preferSystem);
const setTheme = useCallback((nextId: string) => {
Iif (!THEME_IDS.has(nextId)) {
return;
}
try {
localStorage.setItem(STORAGE_KEY, nextId);
} catch {
// localStorage may be unavailable
}
applyTheme(nextId, getPreferSystem(), true);
emitChange();
}, []);
const setPreferSystem = useCallback((prefer: boolean) => {
try {
localStorage.setItem(PREFER_SYSTEM_KEY, prefer ? "true" : "false");
} catch {
// localStorage may be unavailable
}
// When enabling preferSystem, convert variant ID to parent ID
Iif (prefer) {
const stored = getStored();
const def = getThemeById(stored);
Iif (def?.hidden) {
const parent = findParentTheme(stored);
Iif (parent) {
try {
localStorage.setItem(STORAGE_KEY, parent.id);
} catch {
// localStorage may be unavailable
}
}
}
}
applyTheme(getStored(), prefer, true);
emitChange();
}, []);
// Keep DOM in sync on mount/change
useEffect(() => {
applyTheme(themeId, preferSystem);
}, [themeId, preferSystem]);
useEffect(() => {
Iif (typeof window === "undefined") {
return undefined;
}
const mediaQueryList: MediaQueryList = window.matchMedia(MEDIA_QUERY);
const handleChange = (): void => {
const stored: string = getStored();
const prefer: boolean = getPreferSystem();
Iif (prefer) {
const def = getThemeById(stored);
// Parent theme with variants
Iif (def?.variantDarkId && def.variantLightId) {
applyTheme(stored, prefer);
}
// Concrete variant — resolve via parent
Iif (def?.hidden) {
const parent = findParentTheme(stored);
Iif (parent?.variantDarkId && parent.variantLightId) {
applyTheme(stored, prefer);
}
}
}
emitChange();
};
mediaQueryList.addEventListener("change", handleChange);
return () => {
mediaQueryList.removeEventListener("change", handleChange);
};
}, []);
return { themeId, setTheme, resolvedThemeId, preferSystem, setPreferSystem };
}
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