64 lines
1.9 KiB
TypeScript
64 lines
1.9 KiB
TypeScript
import { atom, PrimitiveAtom } from "jotai";
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import { SetAtom } from "jotai/core/atom";
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import { IPerson } from "../components/Person";
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import { IReceiptItem, Receipt } from "../components/ReceiptItem";
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import parseInput from "./parseInput";
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export const totalAtom = atom(0);
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export const receiptAtom = atom<PrimitiveAtom<IReceiptItem>[]>([]);
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export const receiptTotalAtom = atom((get) => {
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const totalValue = get(totalAtom);
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const receipt = get(receiptAtom);
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const totals = new Map();
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let subtotalSum = 0;
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for (const itemAtom of receipt) {
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const item = get(itemAtom);
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const price = get(item.price);
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const splitBetween = get(item.splitBetween);
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const numSplitters = splitBetween.length;
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if (numSplitters == 0) continue;
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const eachPrice = price / numSplitters;
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subtotalSum += price;
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for (const personAtom of splitBetween) {
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const person = get(personAtom);
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const personName = get(person.name);
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let accum = totals.get(personName) || 0;
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accum += eachPrice;
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totals.set(personName, accum);
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}
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}
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if (subtotalSum == 0) return { subtotal: subtotalSum, totalMap: totals };
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const newTotals = new Map();
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const proportion = totalValue / subtotalSum;
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for (const [person, value] of totals.entries()) {
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newTotals.set(person, value * proportion);
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}
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return { subtotal: subtotalSum, totalMap: newTotals };
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});
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export function addLine(
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line: string,
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receipt: Receipt,
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setReceipt: SetAtom<Receipt, void>
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) {
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let parsed = parseInput(line);
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const name: PrimitiveAtom<string> = atom(parsed.itemName);
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const price: PrimitiveAtom<number> = atom(parsed.price || 0);
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const splitBetween: PrimitiveAtom<PrimitiveAtom<IPerson>[]> = atom<
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PrimitiveAtom<IPerson>[]
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>([...parsed.splitBetween].map((a) => atom<IPerson>({ name: atom(a) })));
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const newReceiptItem = atom({
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name,
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price,
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splitBetween,
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});
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setReceipt([...receipt, newReceiptItem]);
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}
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