Start of themes development

server/scripts/modules/utils/theme.mjs

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+const THEME_STORAGE_KEY = 'settings-theme-select';
+const DEFAULT_THEME = 'default';
+const BUILTIN_ASSETS = {
+	background1: '../images/backgrounds/1.png',
+	background2: '../images/backgrounds/2.png',
+	logoCorner: 'images/logos/logo-corner.png',
+};
+
+const getThemeAssets = () => window.WS4KP_THEME_ASSETS ?? {};
+const getAvailableThemes = () => window.WS4KP_THEMES ?? [DEFAULT_THEME];
+
+const getStoredTheme = () => {
+	const storedTheme = localStorage.getItem(THEME_STORAGE_KEY) ?? DEFAULT_THEME;
+	return getAvailableThemes().includes(storedTheme) ? storedTheme : DEFAULT_THEME;
+};
+
+const getThemeAssetUrl = (themeName, assetKey) => {
+	if (themeName === DEFAULT_THEME) {
+		return BUILTIN_ASSETS[assetKey];
+	}
+
+	const themeAssetAvailability = getThemeAssets()[themeName] ?? {};
+	if (!themeAssetAvailability[assetKey]) {
+		return BUILTIN_ASSETS[assetKey];
+	}
+
+	switch (assetKey) {
+		case 'background1':
+			return `../themes/${themeName}/1.png`;
+		case 'background2':
+			return `../themes/${themeName}/2.png`;
+		case 'logoCorner':
+			return `themes/${themeName}/logo-corner.png`;
+		default:
+			return BUILTIN_ASSETS[assetKey];
+	}
+};
+
+const applyTheme = (themeName) => {
+	const selectedTheme = getAvailableThemes().includes(themeName) ? themeName : DEFAULT_THEME;
+	localStorage.setItem(THEME_STORAGE_KEY, selectedTheme);
+
+	document.documentElement.style.setProperty('--theme-background-1', `url('${getThemeAssetUrl(selectedTheme, 'background1')}')`);
+	document.documentElement.style.setProperty('--theme-background-2', `url('${getThemeAssetUrl(selectedTheme, 'background2')}')`);
+
+	document.querySelectorAll('.theme-logo').forEach((img) => {
+		img.src = getThemeAssetUrl(selectedTheme, 'logoCorner');
+	});
+
+	const select = document.querySelector('#theme-select');
+	if (select && select.value !== selectedTheme) {
+		select.value = selectedTheme;
+	}
+	return selectedTheme;
+};
+
+document.addEventListener('DOMContentLoaded', () => {
+	applyTheme(getStoredTheme());
+	const select = document.querySelector('#theme-select');
+	if (!select) return;
+	select.addEventListener('change', (event) => applyTheme(event.target.value));
+	select.value = getStoredTheme();
+	applyTheme(select.value);
+});
+
+export {
+	applyTheme,
+	getStoredTheme,
+};