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Fix/fractional order form rounding errors #317

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merged 5 commits into from
Nov 26, 2024
Merged

Fix/fractional order form rounding errors #317

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3ef4d27
fix: prevent rounding errors in unit calculations by using DEFAULT_NU…
Jipperism Nov 26, 2024
04496fc
fix: disable form when calculated number of units reaches 0, show pri…
Jipperism Nov 26, 2024
4b0ce41
fix: calculate total price using units not percentage in fractional o…
Jipperism Nov 26, 2024
3d5e484
fix: remove magic number for number of decimals in hypercert units
Jipperism Nov 26, 2024
9ee9617
fix: remove redundant utility function getTotalPriceFromPercentage
Jipperism Nov 26, 2024
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19 changes: 12 additions & 7 deletions components/marketplace/buy-fractional-order-form.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ import z from "zod";
import { zodResolver } from "@hookform/resolvers/zod";
import { parseUnits } from "viem";
import { calculateBigIntPercentage } from "@/lib/calculateBigIntPercentage";
import { DEFAULT_NUM_FRACTIONS } from "@/configs/hypercerts";

const formSchema = z
.object({
Expand Down Expand Up @@ -83,9 +84,10 @@ export const BuyFractionalOrderForm = ({
const getUnitsToBuy = (percentageAmount: string) => {
try {
const hypercertUnits = BigInt(hypercert.units || 0);
const percentageAsBigInt = BigInt(Number(percentageAmount) * 100);
const percentageAsBigInt = parseUnits(percentageAmount, 8);
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const unitsToBuy =
(hypercertUnits * percentageAsBigInt) / BigInt(100 * 100);
(hypercertUnits * percentageAsBigInt) /
(BigInt(100) * DEFAULT_NUM_FRACTIONS);
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return unitsToBuy.toString();
} catch (e) {
console.error(e);
Expand Down Expand Up @@ -153,11 +155,16 @@ export const BuyFractionalOrderForm = ({
const percentageAmount = form.watch("percentageAmount");
const pricePerPercent = form.watch("pricePerPercent");

const unitsToBuy =
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BigInt(getUnitsToBuy(percentageAmount)) > BigInt(0)
? getUnitsToBuy(percentageAmount)
: "0";

const totalPrice = formatPrice(
order.chainId,
getTotalPriceFromPercentage(
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BigInt(pricePerPercent),
Number(percentageAmount),
unitsToBuy === "0" ? 0 : Number(percentageAmount),
),
currency.address,
true,
Expand All @@ -169,10 +176,7 @@ export const BuyFractionalOrderForm = ({
currency.address,
);

const unitsToBuy =
BigInt(getUnitsToBuy(percentageAmount)) > BigInt(0)
? getUnitsToBuy(percentageAmount)
: "0";
const disabled = !form.formState.isValid || unitsToBuy === "0";

return (
<Form {...form}>
Expand Down Expand Up @@ -238,6 +242,7 @@ export const BuyFractionalOrderForm = ({
variant={"outline"}
type="button"
onClick={form.handleSubmit(onSubmit)}
disabled={disabled}
>
Execute order
</Button>
Expand Down