Changes

web-player/src/lib/navigation.svelte.ts

@@ -0,0 +1,57 @@
+import { afterNavigate } from '$app/navigation';
+
+const HISTORY_INDEX = 'sveltekit:history';
+
+const LABELS: [RegExp, string][] = [
+	[/^\/$/, 'Volver al inicio'],
+	[/^\/explore\/?$/, 'Volver a explorar'],
+	[/^\/playlists\/[^/]+/, 'Volver a la lista'],
+	[/^\/playlists\/?$/, 'Volver a tus listas'],
+	[/^\/albums\/youtube\/[^/]+/, 'Volver al álbum'],
+	[/^\/albums\/[^/]+/, 'Volver al álbum'],
+	[/^\/albums\/?$/, 'Volver a tus álbumes'],
+	[/^\/library\/?$/, 'Volver a tus canciones'],
+	[/^\/upload\/?$/, 'Volver a subir música'],
+	[/^\/mixes\/[^/]+/, 'Volver a la mezcla']
+];
+
+export interface PageRef {
+	url: string;
+	label: string;
+}
+
+const visited = new Map<number, PageRef>();
+let index = $state(-1);
+
+function labelFor(pathname: string): string | null {
+	for (const [pattern, label] of LABELS) {
+		if (pattern.test(pathname)) return label;
+	}
+	return null;
+}
+
+function historyIndex(): number | null {
+	const value = history.state?.[HISTORY_INDEX];
+	return typeof value === 'number' ? value : null;
+}
+
+export function trackNavigation() {
+	afterNavigate((nav) => {
+		const at = historyIndex();
+		if (at === null) return;
+		const url = nav.to?.url;
+		const label = url ? labelFor(url.pathname) : null;
+		if (url && label) visited.set(at, { url: url.pathname + url.search, label });
+		else visited.delete(at);
+		index = at;
+	});
+}
+
+export function previousPage(): PageRef | null {
+	return visited.get(index - 1) ?? null;
+}
+
+export function isSectionActive(href: string, pathname: string, section?: string | null): boolean {
+	if (section !== undefined) return section === href;
+	return href === '/' ? pathname === '/' : pathname.startsWith(href);
+}