"use server";

import { eq } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { redirect } from "next/navigation";
import { requirePermission } from "@/lib/admin/guard";
import {
	db,
	WebsiteArticleComments,
	WebsiteArticleReactions,
	WebsiteArticles,
} from "@/lib/db";
import { slugify } from "@/lib/format";
import { PERMS } from "@/lib/permissions";

async function uniqueSlug(title: string): Promise<string> {
	const base = slugify(title);
	let slug = base;
	let n = 2;
	for (;;) {
		const [existing] = await db
			.select({ id: WebsiteArticles.id })
			.from(WebsiteArticles)
			.where(eq(WebsiteArticles.slug, slug))
			.limit(1);
		if (!existing) return slug;
		slug = `${base}-${n++}`;
	}
}

export async function createArticle(formData: FormData): Promise<void> {
	const staff = await requirePermission(PERMS.NEWS_EDIT);
	const title = String(formData.get("title") ?? "")
		.normalize("NFC")
		.trim();
	const shortStory = String(formData.get("shortStory") ?? "")
		.normalize("NFC")
		.trim();
	const fullStory = String(formData.get("fullStory") ?? "")
		.normalize("NFC")
		.trim();
	const image = String(formData.get("image") ?? "")
		.normalize("NFC")
		.trim();
	const rawSlug = String(formData.get("slug") ?? "").trim();
	if (!title) return;

	try {
		const now = new Date();
		await db.insert(WebsiteArticles).values({
			slug: rawSlug ? await uniqueSlug(rawSlug) : await uniqueSlug(title),
			title: title.slice(0, 255),
			shortStory: shortStory.slice(0, 255),
			fullStory,
			image: image.slice(0, 255),
			userId: staff.id,
			createdAt: now,
			updatedAt: now,
		});
	} catch {
		// Database error — re-render unchanged with error.
		redirect(
			"/admin/articles/new?error=Database error while creating article. Please try again.",
		);
	}
	redirect("/admin/articles");
}

export async function updateArticle(formData: FormData): Promise<void> {
	await requirePermission(PERMS.NEWS_EDIT);
	const id = BigInt(String(formData.get("id")));
	const rawSlug = String(formData.get("slug") ?? "").trim();
	try {
		await db
			.update(WebsiteArticles)
			.set({
				title: String(formData.get("title") ?? "")
					.normalize("NFC")
					.trim()
					.slice(0, 255),
				...(rawSlug ? { slug: await uniqueSlug(rawSlug) } : {}),
				shortStory: String(formData.get("shortStory") ?? "")
					.normalize("NFC")
					.trim()
					.slice(0, 255),
				fullStory: String(formData.get("fullStory") ?? "")
					.normalize("NFC")
					.trim(),
				image: String(formData.get("image") ?? "")
					.normalize("NFC")
					.trim()
					.slice(0, 255),
				updatedAt: new Date(),
			})
			.where(eq(WebsiteArticles.id, id));
	} catch {
		redirect("/admin/articles?error=Update failed");
	}
	revalidatePath(`/admin/articles/${id}`);
	redirect("/admin/articles");
}

export async function deleteArticle(formData: FormData): Promise<void> {
	await requirePermission(PERMS.NEWS_EDIT);
	const id = BigInt(String(formData.get("id")));
	try {
		await db.transaction(async (tx) => {
			await tx
				.delete(WebsiteArticleReactions)
				.where(eq(WebsiteArticleReactions.articleId, id));
			await tx
				.delete(WebsiteArticleComments)
				.where(eq(WebsiteArticleComments.articleId, id));
			await tx.delete(WebsiteArticles).where(eq(WebsiteArticles.id, id));
		});
	} catch {
		redirect("/admin/articles?error=Delete failed");
	}
	redirect("/admin/articles");
}