import { InternalError } from "@api/errors";
import type { LineItemContext } from "@models/billingModels/lineItem/lineItemContext";
import { featureUsageToDescription } from "@utils/billingUtils/invoicingUtils/descriptionUtils/featureUsageToDescription";
import { lineItemToPeriodDescription } from "@utils/billingUtils/invoicingUtils/descriptionUtils/lineItemToPeriodDescription";
import { isOneOffPrice } from "@utils/productUtils/priceUtils/classifyPriceUtils";

export const usagePriceToLineDescription = ({
	usage,
	context,
	includePeriodDescription = true,
}: {
	usage: number;
	context: LineItemContext;
	includePeriodDescription?: boolean;
}): string => {
	const { price, feature } = context;
	const billingUnits = price.config.billing_units ?? 1;

	if (!feature) {
		throw new InternalError({
			message: `[usagePriceToLineDescription] No feature found for line item context`,
		});
	}

	// 1. Get feature usage description (eg. "3 x 150 credits")
	const featureUsageDescription = featureUsageToDescription({
		feature,
		usage,
		billingUnits,
	});

	const { product } = context;
	let description = `${product.name} - ${featureUsageDescription}`;

	if (!isOneOffPrice(price) && includePeriodDescription) {
		const periodDescription = lineItemToPeriodDescription({
			context,
		});

		description = `${description} (${periodDescription})`;
	}

	if (context.direction === "refund") {
		description = `Unused ${description}`;
	}

	return description;
};