import { db } from '$lib/server/db';
import { blogArticles, lists } from '$lib/server/db/schema';
import { eq } from 'drizzle-orm';

export function slugify(title: string, fallback = 'article'): string {
	return (
		title
			.toLowerCase()
			.trim()
			.replace(/[^a-z0-9]+/g, '-')
			.replace(/^-+|-+$/g, '') || fallback
	);
}

export async function uniqueSlug(title: string): Promise<string> {
	const base = slugify(title);
	let slug = base;
	let suffix = 2;

	while (
		(await db.select({ id: blogArticles.id }).from(blogArticles).where(eq(blogArticles.slug, slug)))
			.length > 0
	) {
		slug = `${base}-${suffix}`;
		suffix += 1;
	}

	return slug;
}

export async function uniqueListSlug(name: string): Promise<string> {
	const base = slugify(name, 'list');
	let slug = base;
	let suffix = 2;
	while ((await db.select({ id: lists.id }).from(lists).where(eq(lists.slug, slug))).length > 0) {
		slug = `${base}-${suffix++}`;
	}
	return slug;
}

export function validSlug(slug: string): boolean {
	return slug.length <= 120 && /^[a-z0-9]+(?:-[a-z0-9]+)*$/.test(slug);
}