diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..b7c2b492 --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +backend/node_modules/ +frontend/node_modules/ +frontend/dist/ +.DS_Store diff --git a/README.md b/README.md index fccbe0ad..854a0680 100644 --- a/README.md +++ b/README.md @@ -1,43 +1,97 @@ # Cash Register -## The Problem -Creative Cash Draw Solutions is a client who wants to provide something different for the cashiers who use their system. The function of the application is to tell the cashier how much change is owed, and what denominations should be used. In most cases the app should return the minimum amount of physical change, but the client would like to add a twist. If the "owed" amount is divisible by 3, the app should randomly generate the change denominations (but the math still needs to be right :)) +Cash register change calculator with: +- `backend` (Node.js + Express API + CLI file processor) +- `frontend` (React + Vite UI) -Please write a program which accomplishes the clients goals. The program should: +## Behavior +- Input format: one line per transaction, `owed,paid` +- Standard behavior: minimum number of denominations +- Twist behavior: if change owed (in cents) is divisible by `3`, denomination selection is randomized but total stays correct -1. Accept a flat file as input - 1. Each line will contain the amount owed and the amount paid separated by a comma (for example: 2.13,3.00) - 2. Expect that there will be multiple lines -2. Output the change the cashier should return to the customer - 1. The return string should look like: 1 dollar,2 quarters,1 nickel, etc ... - 2. Each new line in the input file should be a new line in the output file +Example input: -## Sample Input +```txt 2.12,3.00 - 1.97,2.00 - 3.33,5.00 +``` -## Sample Output -3 quarters,1 dime,3 pennies +Example output: +```txt +3 quarters,1 dime,3 pennies 3 pennies - 1 dollar,1 quarter,6 nickels,12 pennies +``` + +## Project Structure + +```txt +CashRegister/ + backend/ + src/ + config/ + services/ + utils/ + server.js + cli.js + test/ + frontend/ + src/ +``` + +## Backend + +Install dependencies: + +```bash +cd backend +npm install +``` + +Run API: + +```bash +npm start +``` + +Backend endpoints: +- `GET /api/health` +- `GET /api/config` +- `POST /api/change` with JSON body `{ "input": "2.12,3.00\n1.97,2.00" }` + +Run tests: + +```bash +npm test +``` + +Process a flat file from CLI: + +```bash +npm run process-file -- ./path/to/input.txt +``` + +## Frontend -*Remember the last one is random +Install dependencies: -## The Fine Print -Please use whatever technology and techniques you feel are applicable to solve the problem. We suggest that you approach this exercise as if this code was part of a larger system. The end result should be representative of your abilities and style. +```bash +cd frontend +npm install +``` -Please fork this repository. When you have completed your solution, please issue a pull request to notify us that you are ready. +Run UI: -Have fun. +```bash +npm run dev +``` -## Things To Consider -Here are a couple of thoughts about the domain that could influence your response: +The Vite dev server proxies `/api/*` to `http://localhost:4000`. -* What might happen if the client needs to change the random divisor? -* What might happen if the client needs to add another special case (like the random twist)? -* What might happen if sales closes a new client in France? \ No newline at end of file +## Extensibility Notes +- Random rule divisor is centralized in `backend/src/config/rules.js`. +- Denominations are centralized in `backend/src/config/denominations.js`. +- Additional special-case behaviors can be introduced in `backend/src/services/changeCalculator.js` as rule modules. +- Supporting a new currency/locale can be done by adding a denomination config and amount parser strategy. diff --git 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a/backend/package.json b/backend/package.json new file mode 100644 index 00000000..2268a8c2 --- /dev/null +++ b/backend/package.json @@ -0,0 +1,18 @@ +{ + "name": "cash-register-backend", + "version": "1.0.0", + "description": "Cash register API and file processor", + "main": "src/server.js", + "scripts": { + "start": "node src/server.js", + "test": "node --test", + "process-file": "node src/cli.js" + }, + "keywords": [], + "author": "", + "license": "ISC", + "dependencies": { + "cors": "^2.8.6", + "express": "^5.2.1" + } +} diff --git a/backend/src/cli.js b/backend/src/cli.js new file mode 100644 index 00000000..5597721c --- /dev/null +++ b/backend/src/cli.js @@ -0,0 +1,27 @@ +const fs = require('fs'); +const path = require('path'); + +const { USD_DENOMINATIONS } = require('./config/denominations'); +const { RULES } = require('./config/rules'); +const { processInput } = require('./services/inputProcessor'); + +function run() { + const inputPath = process.argv[2]; + + if (!inputPath) { + // eslint-disable-next-line no-console + console.error('Usage: node src/cli.js '); + process.exit(1); + } + + const resolvedPath = path.resolve(process.cwd(), inputPath); + const inputText = fs.readFileSync(resolvedPath, 'utf8'); + const { outputText } = processInput(inputText, USD_DENOMINATIONS, { + randomDivisor: RULES.randomDivisor + }); + + // eslint-disable-next-line no-console + console.log(outputText); +} + +run(); diff --git a/backend/src/config/denominations.js b/backend/src/config/denominations.js new file mode 100644 index 00000000..47d8ed57 --- /dev/null +++ b/backend/src/config/denominations.js @@ -0,0 +1,16 @@ +const USD_DENOMINATIONS = [ + { value: 10000, singular: 'hundred dollar bill', plural: 'hundred dollar bills' }, + { value: 5000, singular: 'fifty dollar bill', plural: 'fifty dollar bills' }, + { value: 2000, singular: 'twenty dollar bill', plural: 'twenty dollar bills' }, + { value: 1000, singular: 'ten dollar bill', plural: 'ten dollar bills' }, + { value: 500, singular: 'five dollar bill', plural: 'five dollar bills' }, + { value: 100, singular: 'dollar', plural: 'dollars' }, + { value: 25, singular: 'quarter', plural: 'quarters' }, + { value: 10, singular: 'dime', plural: 'dimes' }, + { value: 5, singular: 'nickel', plural: 'nickels' }, + { value: 1, singular: 'penny', plural: 'pennies' } +]; + +module.exports = { + USD_DENOMINATIONS +}; diff --git a/backend/src/config/rules.js b/backend/src/config/rules.js new file mode 100644 index 00000000..ef59cb5a --- /dev/null +++ b/backend/src/config/rules.js @@ -0,0 +1,7 @@ +const RULES = { + randomDivisor: 3 +}; + +module.exports = { + RULES +}; diff --git a/backend/src/server.js b/backend/src/server.js new file mode 100644 index 00000000..662f3f9b --- /dev/null +++ b/backend/src/server.js @@ -0,0 +1,53 @@ +const express = require('express'); +const cors = require('cors'); + +const { USD_DENOMINATIONS } = require('./config/denominations'); +const { RULES } = require('./config/rules'); +const { processInput } = require('./services/inputProcessor'); + +const app = express(); +const port = process.env.PORT || 4000; + +app.use(cors()); +app.use(express.json({ limit: '1mb' })); + +app.get('/api/health', (_req, res) => { + res.json({ ok: true }); +}); + +app.get('/api/config', (_req, res) => { + res.json({ + randomDivisor: RULES.randomDivisor, + denominations: USD_DENOMINATIONS + }); +}); + +app.post('/api/change', (req, res) => { + const { input } = req.body || {}; + + if (typeof input !== 'string') { + return res.status(400).json({ + error: 'Request body must include an input string' + }); + } + + try { + const processed = processInput(input, USD_DENOMINATIONS, { + randomDivisor: RULES.randomDivisor + }); + + return res.json({ + ...processed, + randomDivisor: RULES.randomDivisor + }); + } catch (error) { + return res.status(400).json({ + error: error.message + }); + } +}); + +app.listen(port, () => { + // eslint-disable-next-line no-console + console.log(`Cash register API listening on port ${port}`); +}); diff --git a/backend/src/services/changeCalculator.js b/backend/src/services/changeCalculator.js new file mode 100644 index 00000000..4026bce7 --- /dev/null +++ b/backend/src/services/changeCalculator.js @@ -0,0 +1,64 @@ +const { RULES } = require('../config/rules'); + +function isRandomCase(changeCents, randomDivisor = RULES.randomDivisor) { + if (changeCents <= 0) { + return false; + } + + return changeCents % randomDivisor === 0; +} + +function calculateMinimumChange(changeCents, denominations) { + let remaining = changeCents; + const counts = new Map(); + + for (const denomination of denominations) { + if (remaining === 0) { + break; + } + + const quantity = Math.floor(remaining / denomination.value); + if (quantity > 0) { + counts.set(denomination.value, quantity); + remaining -= quantity * denomination.value; + } + } + + return counts; +} + +function calculateRandomChange(changeCents, denominations) { + let remaining = changeCents; + const counts = new Map(); + + while (remaining > 0) { + const eligible = denominations.filter((denomination) => denomination.value <= remaining); + const randomIndex = Math.floor(Math.random() * eligible.length); + const selected = eligible[randomIndex]; + + counts.set(selected.value, (counts.get(selected.value) || 0) + 1); + remaining -= selected.value; + } + + return counts; +} + +function calculateChangeBreakdown(changeCents, denominations, options = {}) { + const randomDivisor = options.randomDivisor || RULES.randomDivisor; + const randomMode = isRandomCase(changeCents, randomDivisor); + const counts = randomMode + ? calculateRandomChange(changeCents, denominations) + : calculateMinimumChange(changeCents, denominations); + + return { + randomMode, + counts + }; +} + +module.exports = { + isRandomCase, + calculateMinimumChange, + calculateRandomChange, + calculateChangeBreakdown +}; diff --git a/backend/src/services/changeFormatter.js b/backend/src/services/changeFormatter.js new file mode 100644 index 00000000..dae3a65c --- /dev/null +++ b/backend/src/services/changeFormatter.js @@ -0,0 +1,19 @@ +function formatBreakdown(counts, denominations) { + const pieces = []; + + for (const denomination of denominations) { + const quantity = counts.get(denomination.value); + if (!quantity) { + continue; + } + + const label = quantity === 1 ? denomination.singular : denomination.plural; + pieces.push(`${quantity} ${label}`); + } + + return pieces.length === 0 ? 'no change' : pieces.join(','); +} + +module.exports = { + formatBreakdown +}; diff --git a/backend/src/services/inputProcessor.js b/backend/src/services/inputProcessor.js new file mode 100644 index 00000000..42502b56 --- /dev/null +++ b/backend/src/services/inputProcessor.js @@ -0,0 +1,67 @@ +const { amountToCents } = require('../utils/money'); +const { calculateChangeBreakdown } = require('./changeCalculator'); +const { formatBreakdown } = require('./changeFormatter'); + +function parseLine(line, lineNumber) { + const trimmed = line.trim(); + + if (!trimmed) { + return { + lineNumber, + empty: true, + output: '' + }; + } + + const [owedRaw, paidRaw, ...extra] = trimmed.split(','); + if (extra.length > 0 || !owedRaw || !paidRaw) { + throw new Error(`Line ${lineNumber}: expected "owed,paid"`); + } + + const owedCents = amountToCents(owedRaw); + const paidCents = amountToCents(paidRaw); + + if (paidCents < owedCents) { + throw new Error(`Line ${lineNumber}: paid amount is less than owed amount`); + } + + return { + lineNumber, + owedCents, + paidCents, + changeCents: paidCents - owedCents, + empty: false + }; +} + +function processInput(inputText, denominations, options = {}) { + const lines = String(inputText).split(/\r?\n/); + const results = lines.map((line, index) => { + const parsed = parseLine(line, index + 1); + + if (parsed.empty) { + return parsed; + } + + const breakdown = calculateChangeBreakdown(parsed.changeCents, denominations, options); + const output = formatBreakdown(breakdown.counts, denominations); + + return { + lineNumber: parsed.lineNumber, + owedCents: parsed.owedCents, + paidCents: parsed.paidCents, + changeCents: parsed.changeCents, + randomMode: breakdown.randomMode, + output + }; + }); + + return { + results, + outputText: results.map((result) => result.output).join('\n') + }; +} + +module.exports = { + processInput +}; diff --git a/backend/src/utils/money.js b/backend/src/utils/money.js new file mode 100644 index 00000000..3e5110e1 --- /dev/null +++ b/backend/src/utils/money.js @@ -0,0 +1,21 @@ +function amountToCents(amountText) { + const normalized = String(amountText).trim(); + + if (!/^\d+(\.\d{1,2})?$/.test(normalized)) { + throw new Error(`Invalid currency amount: "${amountText}"`); + } + + const [wholePart, decimalPart = ''] = normalized.split('.'); + const centsPart = (decimalPart + '00').slice(0, 2); + + return Number(wholePart) * 100 + Number(centsPart); +} + +function centsToDisplay(cents) { + return (cents / 100).toFixed(2); +} + +module.exports = { + amountToCents, + centsToDisplay +}; diff --git a/backend/test/changeCalculator.test.js b/backend/test/changeCalculator.test.js new file mode 100644 index 00000000..2445766a --- /dev/null +++ b/backend/test/changeCalculator.test.js @@ -0,0 +1,29 @@ +const test = require('node:test'); +const assert = require('node:assert/strict'); + +const { USD_DENOMINATIONS } = require('../src/config/denominations'); +const { calculateMinimumChange, calculateChangeBreakdown } = require('../src/services/changeCalculator'); +const { formatBreakdown } = require('../src/services/changeFormatter'); +const { processInput } = require('../src/services/inputProcessor'); + +test('minimum change uses expected denominations for non-random amounts', () => { + const counts = calculateMinimumChange(88, USD_DENOMINATIONS); + const text = formatBreakdown(counts, USD_DENOMINATIONS); + + assert.equal(text, '3 quarters,1 dime,3 pennies'); +}); + +test('random rule is enabled when change is divisible by 3', () => { + const result = calculateChangeBreakdown(99, USD_DENOMINATIONS, { randomDivisor: 3 }); + + assert.equal(result.randomMode, true); +}); + +test('input processor handles multi-line input', () => { + const input = '2.12,3.00\n1.97,2.00'; + const output = processInput(input, USD_DENOMINATIONS, { randomDivisor: 97 }); + + assert.equal(output.results.length, 2); + assert.equal(output.results[0].output, '3 quarters,1 dime,3 pennies'); + assert.equal(output.results[1].output, '3 pennies'); +}); diff --git a/frontend/index.html b/frontend/index.html new file mode 100644 index 00000000..ae8bf119 --- /dev/null +++ b/frontend/index.html @@ -0,0 +1,12 @@ + + + + + + Cash Register + + +
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"^18.3.1" + }, + "devDependencies": { + "@vitejs/plugin-react": "^4.3.4", + "vite": "^5.4.10" + } +} diff --git a/frontend/src/App.css b/frontend/src/App.css new file mode 100644 index 00000000..b2256602 --- /dev/null +++ b/frontend/src/App.css @@ -0,0 +1,122 @@ +:root { + font-family: 'Avenir Next', 'Segoe UI', sans-serif; + color: #1f2937; + background: linear-gradient(120deg, #f8fafc 0%, #dbeafe 100%); +} + +* { + box-sizing: border-box; +} + +body { + margin: 0; +} + +.layout { + min-height: 100vh; + display: grid; + grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); + gap: 1rem; + padding: 1rem; +} + +.card { + background: rgba(255, 255, 255, 0.9); + border: 1px solid #bfdbfe; + border-radius: 12px; + padding: 1rem; + box-shadow: 0 10px 20px rgba(30, 64, 175, 0.08); +} + +h1, +h2, +h3 { + margin-top: 0; +} + +label { + display: block; + margin-bottom: 0.5rem; + font-weight: 600; +} + +textarea { + width: 100%; + border: 1px solid #93c5fd; + border-radius: 8px; + padding: 0.75rem; + resize: vertical; + font-family: ui-monospace, SFMono-Regular, Menlo, monospace; +} + +.row { + margin-top: 0.75rem; + display: flex; + gap: 0.75rem; + align-items: center; + justify-content: space-between; + flex-wrap: wrap; +} + +.controls { + align-items: flex-end; +} + +select { + border: 1px solid #93c5fd; + border-radius: 8px; + padding: 0.45rem 0.65rem; + min-width: 220px; +} + +.hint { + margin-top: 0; + color: #334155; + font-size: 0.92rem; +} + +.to-usd { + color: #1e40af; + font-weight: 600; +} + +button { + border: 0; + border-radius: 8px; + background: #2563eb; + color: white; + padding: 0.65rem 1rem; + cursor: pointer; +} + +button:disabled { + opacity: 0.65; + cursor: wait; +} + +.output { + background: #0f172a; + color: #e2e8f0; + border-radius: 8px; + padding: 0.75rem; + min-height: 160px; + overflow: auto; +} + +.error { + color: #b91c1c; + font-weight: 600; +} + +table { + margin-top: 0.75rem; + width: 100%; + border-collapse: collapse; +} + +th, +td { + border-bottom: 1px solid #dbeafe; + text-align: left; + padding: 0.5rem; +} diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx new file mode 100644 index 00000000..c8ab39f4 --- /dev/null +++ b/frontend/src/App.jsx @@ -0,0 +1,253 @@ +import { useEffect, useMemo, useState } from "react"; + +const SAMPLE_INPUT = `2.12,3.00 +1.97,2.00 +3.33,5.00`; +const FRANKFURTER_BASE_URL = "https://api.frankfurter.dev/v1"; +const FALLBACK_CURRENCIES = [ + { code: "USD", name: "US Dollar" }, + { code: "EUR", name: "Euro" }, + { code: "GBP", name: "British Pound" }, + { code: "CAD", name: "Canadian Dollar" }, + { code: "JPY", name: "Japanese Yen" }, +]; + +function validateAmount(amountText, lineNumber) { + const value = String(amountText).trim(); + if (!/^\d+(\.\d{1,2})?$/.test(value)) { + throw new Error(`Line ${lineNumber}: invalid amount "${amountText}"`); + } + + return Number(value); +} + +function convertInputToUsd(inputText, usdRate) { + const lines = String(inputText).split(/\r?\n/); + + return lines + .map((line, index) => { + const lineNumber = index + 1; + const trimmed = line.trim(); + + if (!trimmed) { + return ""; + } + + const [owedRaw, paidRaw, ...extra] = trimmed.split(","); + if (extra.length > 0 || !owedRaw || !paidRaw) { + throw new Error(`Line ${lineNumber}: expected "owed,paid"`); + } + + const owed = validateAmount(owedRaw, lineNumber); + const paid = validateAmount(paidRaw, lineNumber); + const owedUsd = (owed * usdRate).toFixed(2); + const paidUsd = (paid * usdRate).toFixed(2); + + return `${owedUsd},${paidUsd}`; + }) + .join("\n"); +} + +function App() { + const [inputText, setInputText] = useState(SAMPLE_INPUT); + const [convertedInputText, setConvertedInputText] = useState(SAMPLE_INPUT); + const [results, setResults] = useState([]); + const [outputText, setOutputText] = useState(""); + const [randomDivisor, setRandomDivisor] = useState(null); + const [currencies, setCurrencies] = useState(FALLBACK_CURRENCIES); + const [fromCurrency, setFromCurrency] = useState("USD"); + const [rateDate, setRateDate] = useState(""); + const [rateUsed, setRateUsed] = useState(1); + const [error, setError] = useState(""); + const [loading, setLoading] = useState(false); + + useEffect(() => { + let cancelled = false; + + async function loadCurrencies() { + try { + const response = await fetch(`${FRANKFURTER_BASE_URL}/currencies`); + const data = await response.json(); + if (!response.ok) { + return; + } + + const list = Object.entries(data).map(([code, name]) => ({ + code, + name, + })); + list.sort((a, b) => a.code.localeCompare(b.code)); + if (!cancelled && list.length > 0) { + setCurrencies(list); + } + } catch (_error) { + // Keep fallback currency list if the request fails. + } + } + + loadCurrencies(); + return () => { + cancelled = true; + }; + }, []); + + const nonEmptyResultCount = useMemo( + () => results.filter((entry) => entry.output !== "").length, + [results], + ); + + async function getUsdRate(baseCurrency) { + if (baseCurrency === "USD") { + return { rate: 1, date: "live" }; + } + + const response = await fetch( + `${FRANKFURTER_BASE_URL}/latest?base=${baseCurrency}&symbols=USD`, + ); + const data = await response.json(); + if (!response.ok || !data?.rates?.USD) { + throw new Error("Unable to fetch exchange rate"); + } + + return { rate: Number(data.rates.USD), date: data.date || "" }; + } + + async function handleProcess() { + setLoading(true); + setError(""); + + try { + const { rate, date } = await getUsdRate(fromCurrency); + const usdInput = + fromCurrency === "USD" ? inputText : convertInputToUsd(inputText, rate); + + const response = await fetch("/api/change", { + method: "POST", + headers: { + "Content-Type": "application/json", + }, + body: JSON.stringify({ input: usdInput }), + }); + + const data = await response.json(); + if (!response.ok) { + throw new Error(data.error || "Request failed"); + } + + setConvertedInputText(usdInput); + setRateUsed(rate); + setRateDate(date); + setResults(data.results || []); + setOutputText(data.outputText || ""); + setRandomDivisor(data.randomDivisor ?? null); + } catch (requestError) { + setResults([]); + setOutputText(""); + setError(requestError.message); + } finally { + setLoading(false); + } + } + + function handleFileLoad(event) { + const file = event.target.files?.[0]; + if (!file) { + return; + } + + const reader = new FileReader(); + reader.onload = () => { + setInputText(String(reader.result || "")); + }; + reader.readAsText(file); + } + + return ( +
+
+

Cash Register

+

+ Enter one owed,paid pair per line. If change is divisible + by {randomDivisor ?? 3}, denominations are + randomized. +

+

+ Input currency is selected below, then converted to USD before + calculating change. +

+ +
+ + + Converted to: USD +
+ + +