<script lang="ts">
	import { page } from '$app/state';
	import { resolve } from '$app/paths';
	import { getLibraryState } from '$lib/state/library.svelte';

	let { children } = $props();

	// Set in (root)/+layout.svelte, above this group, so listing the libraries in
	// the nav needs no load function.
	const libraryState = getLibraryState();

	// Route ids rather than paths: resolve() is called in the markup so it stays a
	// direct call the lint rule can see, and the active check compares route ids.
	// A pathname comparison would miss during SSR, where resolve() returns a
	// relative path, and only settle after hydration.
	const items = [
		{ title: 'Account', routeId: '/(root)/settings/account' },
		{ title: 'Appearance', routeId: '/(root)/settings/appearance' },
		{ title: 'Libraries', routeId: '/(root)/settings/libraries' },
		{ title: 'Devices', routeId: '/(root)/settings/devices' }
	] as const;

	/**
	 * Whether a nested library item is the one being looked at.
	 *
	 * Both halves are needed: the route id alone is shared by every library, so
	 * matching on it would light all of them up at once.
	 */
	function isActiveLibrary(id: number) {
		return (
			page.route.id?.startsWith('/(root)/settings/libraries/[libraryId]') === true &&
			page.params.libraryId === String(id)
		);
	}
</script>

<div class="flex h-[calc(100vh-var(--header-height)-2rem)] flex-col">
	<h1 class="font-serif text-xl font-medium tracking-tight">Settings</h1>
	<div class="mt-6 flex flex-1 gap-8 overflow-hidden">
		<!-- Scrolls on its own now that it holds a list that grows with the number
		     of libraries; the row above it is overflow-hidden, so without this a
		     long list is clipped rather than reachable. -->
		<nav class="flex w-48 shrink-0 flex-col gap-1 overflow-y-auto">
			{#each items as item (item.routeId)}
				<a
					href={resolve(item.routeId)}
					class="rounded-md px-3 py-2 text-sm font-medium transition-colors hover:bg-muted {page
						.route.id === item.routeId
						? 'bg-muted'
						: 'text-muted-foreground'}"
				>
					{item.title}
				</a>

				<!-- Libraries is the one item with children: a library's own settings
				     hang off it, so every library and every section it has stay one
				     click from here. -->
				{#if item.routeId === '/(root)/settings/libraries'}
					{#each libraryState.libraries as library (library.id)}
						<a
							href={resolve('/(root)/settings/libraries/[libraryId]/duplicates', {
								libraryId: String(library.id)
							})}
							class="ml-3 truncate rounded-md border-l px-3 py-1.5 text-sm transition-colors hover:bg-muted {isActiveLibrary(
								library.id
							)
								? 'bg-muted font-medium'
								: 'text-muted-foreground'}"
						>
							{library.name}
						</a>
					{/each}
				{/if}
			{/each}
		</nav>
		<div class="flex-1 overflow-auto">{@render children()}</div>
	</div>
</div>
