Interface improvements

components/EditBox.tsx

@@ -2,8 +2,15 @@ import { Atom, useAtom } from "jotai";
 import { useState } from "react";
 import styled from "styled-components";
 
-export interface Props {
-  valueAtom: Atom<number>;
+export interface CanBeConvertedToString {
+  toString(): string;
+}
+
+export interface Props<T extends CanBeConvertedToString> {
+  valueAtom: Atom<T>;
+  formatter?: (arg: T) => string;
+  inputType?: string;
+  validator: (arg: string) => T | null;
 }
 
 const ClickableContainer = styled.span`
@@ -12,7 +19,6 @@ const ClickableContainer = styled.span`
   margin: 4px;
   border: 1px solid #eee;
   border-radius: 5px;
-  width: 120px;
 
   &:hover {
     background-color: #eee;
@@ -25,19 +31,18 @@ const EditingBox = styled.input`
   margin: 4px;
   border: 1px solid #eee;
   border-radius: 5px;
-  width: 120px;
 `;
 
-export default function EditBox({ valueAtom }: Props) {
+export default function EditBox<T extends CanBeConvertedToString>({
+  valueAtom,
+  formatter,
+  inputType,
+  validator,
+}: Props<T>) {
   const [value, setValue] = useAtom(valueAtom);
   const [valueInput, setValueInput] = useState("");
   const [editing, setEditing] = useState(false);
 
-  const formatter = new Intl.NumberFormat("en-US", {
-    style: "currency",
-    currency: "USD",
-  });
-
   const startEditing = (_: any) => {
     setValueInput(value.toString());
     setEditing(true);
@@ -45,13 +50,10 @@ export default function EditBox({ valueAtom }: Props) {
 
   const finalize = (e: Event) => {
     e.preventDefault();
-    try {
-      const n = parseFloat(valueInput);
-      if (isNaN(n) || !isFinite(n)) return;
-      setValue(n);
+    const validateResult = validator(valueInput);
+    if (validateResult !== null) {
+      setValue(validateResult);
       setEditing(false);
-    } catch (e) {
-      // TODO: Handle
     }
   };
 
@@ -60,7 +62,7 @@ export default function EditBox({ valueAtom }: Props) {
       <form onSubmit={finalize} style={{ display: "inline" }}>
         <EditingBox
           autoFocus={true}
-          type="number"
+          type={inputType ?? "text"}
           step="0.01"
           value={valueInput}
           onBlur={finalize}
@@ -71,7 +73,7 @@ export default function EditBox({ valueAtom }: Props) {
   } else {
     return (
       <ClickableContainer onClick={startEditing}>
-        {formatter.format(value)}
+        {formatter ? formatter(value) : value.toString()}
       </ClickableContainer>
     );
   }

components/NumberEditBox.tsx

@@ -0,0 +1,28 @@
+import { Atom } from "jotai";
+import EditBox from "./EditBox";
+
+export interface Props {
+  valueAtom: Atom<number>;
+  formatter?: (arg: number) => string;
+}
+
+export default function NumberEditBox({ valueAtom, formatter }: Props) {
+  const validator = (arg: string) => {
+    try {
+      const n = parseFloat(arg);
+      if (isNaN(n) || !isFinite(n)) return;
+      return n;
+    } catch (e) {
+      return null;
+    }
+  };
+
+  return (
+    <EditBox
+      valueAtom={valueAtom}
+      inputType="number"
+      formatter={formatter ?? ((n) => n.toString())}
+      validator={validator}
+    />
+  );
+}

components/Person.tsx

@@ -1,13 +1,14 @@
 import { Atom, useAtom, WritableAtom } from "jotai";
 import { Badge, ListGroup } from "react-bootstrap";
+import EditBox from "./EditBox";
 
 export interface IPerson {
-  name: string;
+  name: Atom<string>;
 }
 
 export interface Props {
   personAtom: Atom<IPerson>;
-  splitBetweenAtom: WritableAtom<Atom<IPerson>[]>;
+  splitBetweenAtom: Atom<Atom<IPerson>[]>;
 }
 
 export default function Person({ personAtom, splitBetweenAtom }: Props) {
@@ -19,8 +20,9 @@ export default function Person({ personAtom, splitBetweenAtom }: Props) {
   };
 
   return (
-    <ListGroup.Item>
-      {person.name}
+    <>
+      <EditBox valueAtom={person.name} validator={(s) => s} />
+
       <Badge
         bg="danger"
         pill
@@ -29,6 +31,6 @@ export default function Person({ personAtom, splitBetweenAtom }: Props) {
       >
         &times;
       </Badge>
-    </ListGroup.Item>
+    </>
   );
 }

components/ReceiptItem.tsx

@@ -1,18 +1,22 @@
 import { Atom, useAtom } from "jotai";
 import { Badge, Card } from "react-bootstrap";
+import { moneyFormatter } from "../lib/formatter";
 import { receiptAtom } from "../lib/state";
 import EditBox from "./EditBox";
+import NumberEditBox from "./NumberEditBox";
 import { IPerson } from "./Person";
 import SplitBetween from "./SplitBetween";
 
 export interface IReceiptItem {
-  name: string;
+  name: Atom<string>;
   price: Atom<number>;
   splitBetween: Atom<Atom<IPerson>[]>;
 }
 
 function Price({ priceAtom }) {
-  return <EditBox valueAtom={priceAtom} />;
+  return (
+    <NumberEditBox valueAtom={priceAtom} formatter={moneyFormatter.format} />
+  );
 }
 
 export interface Props {
@@ -31,7 +35,9 @@ export default function ReceiptItem({ itemAtom }: Props) {
     <Card>
       <Card.Header>
         <Card.Title className="d-flex justify-content-between align-items-center">
-          <h3>{item.name}</h3>
+          <h3>
+            <EditBox valueAtom={item.name} validator={(s) => s} />
+          </h3>
           <span>
             <Price priceAtom={item.price} />
             <Badge

components/SplitBetween.tsx

@@ -1,6 +1,6 @@
 import { atom, Atom, useAtom } from "jotai";
 import { useState } from "react";
-import { ListGroup } from "react-bootstrap";
+import { Button, Form, ListGroup } from "react-bootstrap";
 import Person, { IPerson } from "./Person";
 
 export interface Props {
@@ -19,37 +19,37 @@ export default function SplitBetween({ splitBetweenAtom }: Props) {
 
   const addPerson = (e) => {
     e.preventDefault();
-    setSplitBetween([...splitBetween, atom({ name: input })]);
+    const person = { name: atom(input) };
+    setSplitBetween([...splitBetween, atom(person)]);
     setEditing(false);
   };
 
   return (
     <div>
       Split between ({splitBetween.length}):
-      <ListGroup horizontal>
-        {splitBetween.map((a, i) => (
-          <Person
-            personAtom={a}
-            key={`split-${i}`}
-            splitBetweenAtom={splitBetweenAtom}
-          />
-        ))}
-        <ListGroup.Item onClick={startEditing}>
-          {editing ? (
-            <form onSubmit={addPerson}>
-              <input
-                autoFocus={true}
-                type="text"
-                value={input}
-                onBlur={(_) => setEditing(false)}
-                onInput={(e) => setInput(e.target.value)}
-              />
-            </form>
-          ) : (
-            "[+]"
-          )}
-        </ListGroup.Item>
-      </ListGroup>
+      {splitBetween.map((a, i) => (
+        <Person
+          personAtom={a}
+          key={`split-${i}`}
+          splitBetweenAtom={splitBetweenAtom}
+        />
+      ))}
+      <Button onClick={startEditing} variant="default">
+        {editing ? (
+          <Form onSubmit={addPerson}>
+            <Form.Control
+              autoFocus={true}
+              type="text"
+              value={input}
+              placeholder="Add person to split with..."
+              onBlur={(_) => setEditing(false)}
+              onInput={(e) => setInput(e.target.value)}
+            />
+          </Form>
+        ) : (
+          "[+]"
+        )}
+      </Button>
     </div>
   );
 }

lib/formatter.ts

@@ -0,0 +1,4 @@
+export const moneyFormatter = new Intl.NumberFormat("en-US", {
+  style: "currency",
+  currency: "USD",
+});

lib/state.ts

@@ -22,32 +22,33 @@ export const receiptTotalAtom = atom((get) => {
     subtotalSum += price;
     for (const personAtom of splitBetween) {
       const person = get(personAtom);
-      const personName = person.name;
+      const personName = get(person.name);
       let accum = totals.get(personName) || 0;
       accum += eachPrice;
       totals.set(personName, accum);
     }
   }
 
-  if (subtotalSum == 0) return totals;
+  if (subtotalSum == 0) return { subtotal: subtotalSum, totalMap: totals };
 
   const newTotals = new Map();
   const proportion = totalValue / subtotalSum;
   for (const [person, value] of totals.entries()) {
     newTotals.set(person, value * proportion);
   }
-  return newTotals;
+  return { subtotal: subtotalSum, totalMap: newTotals };
 });
 
 export function addLine(line: string, setReceipt) {
   let parsed = parseInput(line);
   console.log(parsed);
+  const name = atom(parsed.itemName);
   const price = atom(parsed.price || 0);
   const splitBetween = atom(
     [...parsed.splitBetween].map((a) => atom({ name: a }))
   );
   setReceipt((prev) => [
     ...prev,
-    atom<IReceiptItem>({ name: parsed.itemName, price, splitBetween }),
+    atom<IReceiptItem>({ name, price, splitBetween }),
   ]);
 }

pages/index.tsx

@@ -1,10 +1,11 @@
-import { atom, useAtom } from "jotai";
+import { useAtom } from "jotai";
 import type { NextPage } from "next";
 import { useState } from "react";
 import { Form } from "react-bootstrap";
-import EditBox from "../components/EditBox";
-import ReceiptItem, { IReceiptItem } from "../components/ReceiptItem";
-import parseInput, { ParsedInputDisplay } from "../lib/parseInput";
+import NumberEditBox from "../components/NumberEditBox";
+import ReceiptItem from "../components/ReceiptItem";
+import { moneyFormatter } from "../lib/formatter";
+import { ParsedInputDisplay } from "../lib/parseInput";
 import {
   addLine,
   receiptAtom,
@@ -14,8 +15,9 @@ import {
 
 const Home: NextPage = () => {
   const [receipt, setReceipt] = useAtom(receiptAtom);
-  const [total] = useAtom(receiptTotalAtom);
   const [input, setInput] = useState("");
+  const [total] = useAtom(totalAtom);
+  const [calculated] = useAtom(receiptTotalAtom);
 
   const formatter = new Intl.NumberFormat("en-US", {
     style: "currency",
@@ -48,20 +50,25 @@ const Home: NextPage = () => {
 
       <div>
         Receipt Total:
-        <EditBox valueAtom={totalAtom} />
+        <span style={total < calculated.subtotal ? { color: "red" } : {}}>
+          <NumberEditBox
+            valueAtom={totalAtom}
+            formatter={moneyFormatter.format}
+          />
+        </span>
       </div>
 
       {receipt.map((itemAtom, i) => {
         return <ReceiptItem itemAtom={itemAtom} key={`receiptItem-${i}`} />;
       })}
 
-      {total.size > 0 && (
+      {calculated.totalMap.size > 0 && (
         <>
           <h3>Weighted Breakdown</h3>
 
           <div>
             <ul>
-              {[...total.entries()].map(([person, value], i) => (
+              {[...calculated.totalMap.entries()].map(([person, value], i) => (
                 <li key={`breakdown-${i}`}>
                   <b>{person}</b>: {formatter.format(value)}
                 </li>