/** Shared helpers for Shopify/Woo one-shot product sync scope. */

export const MAX_SYNC_PRODUCT_IDS = 500;

export type ProductSyncScopeInput = {
	syncLimit: number;
	status?: string;
	category?: string;
	productIds?: readonly string[];
};

/** Deduplicate trimmed IDs; drop empties. Does not cap. */
export function normalizeProductIds(ids: readonly string[]): string[] {
	const out: string[] = [];
	const seen = new Set<string>();
	for (const raw of ids) {
		const id = String(raw ?? "").trim();
		if (!id || seen.has(id)) continue;
		seen.add(id);
		out.push(id);
	}
	return out;
}

/** Toggle id in list; enforces max when adding. */
export function toggleProductId(
	list: readonly string[],
	id: string,
	max = MAX_SYNC_PRODUCT_IDS
): string[] {
	const key = String(id ?? "").trim();
	if (!key) return normalizeProductIds(list);
	const current = normalizeProductIds(list);
	if (current.includes(key)) return current.filter((x) => x !== key);
	if (current.length >= max) return current;
	return [...current, key];
}

/**
 * Build POST /sync JSON body.
 * When product_ids is non-empty: exact-ID sync only (omit sync_limit, status, category).
 */
export function buildProductSyncBody(input: ProductSyncScopeInput): Record<string, unknown> {
	const productIds = normalizeProductIds(input.productIds ?? []).slice(0, MAX_SYNC_PRODUCT_IDS);
	if (productIds.length > 0) {
		return { product_ids: productIds };
	}
	const body: Record<string, unknown> = {
		sync_limit: Number.isFinite(input.syncLimit) && input.syncLimit > 0 ? Math.floor(input.syncLimit) : 200
	};
	const status = String(input.status ?? "").trim();
	if (status) body.status = status;
	const category = String(input.category ?? "").trim();
	if (category) body.category = category;
	return body;
}