import type { Order, OrderItem, QuotePayload } from '../../../types';
import { parseNum } from '../../../shared/utils';
import { StoreSettingsResponse } from 'types/settings';

/** Per-item dimensions (numbers) for building a multi-parcel quote payload. */
export interface ItemDimensions {
	length: number;
	width: number;
	height: number;
	weight: number;
}

/**
 * Build POST /quotes body with one parcel per order item.
 * @param getItemDimensions - Returns dimensions for each item (from overrides, item, or defaults).
 */
export function buildQuotePayloadFromItems(
	order: Order,
	store: StoreSettingsResponse | null,
	getItemDimensions: (itemIndex: number, item: OrderItem) => ItemDimensions
): QuotePayload | null {
	if (!store?.country || !order?.shipping?.country || !order.items?.length) return null;

	const parcels = order.items.map((item, index) => {
		const dimensions = getItemDimensions(index, item);
		const lineTotal = parseNum(item.total) ?? 0;
		const valuePence = Math.max(1, Math.round(lineTotal * 100));
		return {
			ref: item.product_id ?? `item-${index}`,
			weight: dimensions.weight > 0 ? dimensions.weight : 1,
			length: Math.max(1, Math.round(dimensions.length)),
			width: Math.max(1, Math.round(dimensions.width)),
			height: Math.max(1, Math.round(dimensions.height)),
			value: valuePence,
		};
	});

	return {
		origin: {
			country: store.country,
			countryName: store.countryName,
			postcode: store.postcode || undefined,
		},
		destination: {
			country: order.shipping.country,
			countryName: order.shipping.country_name ?? order.shipping.country,
			postcode: order.shipping.postcode || undefined,
		},
		parcels,
	};
}