// Public REST: rare furni trade values (website_rare_values).
// AtomCMS JSON API parity — read-only catalog of rares with their credit /
// currency values. Supports ?category=<id> filter; paginated, ordered by name.
import { asc, count, eq } from "drizzle-orm";
import { apiError, apiJson, pagination, positiveBigInt } from "@/lib/api";
import { db, WebsiteRareValues } from "@/lib/db";

export async function GET(req: Request) {
	const sp = new URL(req.url).searchParams;
	const { page, perPage, skip, take } = pagination(sp);

	// Optional ?category=<id> filter (category_id is a BigInt).
	const categoryRaw = sp.get("category");
	let categoryId: bigint | undefined;
	if (categoryRaw !== null) {
		const parsed = positiveBigInt(categoryRaw);
		if (!parsed) return apiError("A valid category id is required", 422);
		categoryId = parsed;
	}

	try {
		const where =
			categoryId !== undefined
				? eq(WebsiteRareValues.categoryId, categoryId)
				: undefined;

		const [totalRows, data] = await Promise.all([
			db.select({ total: count() }).from(WebsiteRareValues).where(where),
			db
				.select({
					id: WebsiteRareValues.id,
					categoryId: WebsiteRareValues.categoryId,
					itemId: WebsiteRareValues.itemId,
					name: WebsiteRareValues.name,
					creditValue: WebsiteRareValues.creditValue,
					currencyValue: WebsiteRareValues.currencyValue,
					currencyType: WebsiteRareValues.currencyType,
					furnitureIcon: WebsiteRareValues.furnitureIcon,
				})
				.from(WebsiteRareValues)
				.where(where)
				.orderBy(asc(WebsiteRareValues.name))
				.limit(take)
				.offset(skip),
		]);
		const total = totalRows[0]?.total ?? 0;

		return apiJson({
			data,
			meta: {
				page,
				perPage,
				total,
				lastPage: Math.max(1, Math.ceil(total / perPage)),
			},
		});
	} catch {
		// DB unreachable — never 500; return an empty, well-formed payload.
		return apiJson(
			{ data: [], meta: { page, perPage, total: 0, lastPage: 1 } },
			{ status: 200 },
		);
	}
}