Create expenses tracker application with Next.js

src/app/layout.tsx

@@ -13,8 +13,8 @@ const geistMono = Geist_Mono({
 });
 
 export const metadata: Metadata = {
-  title: "Create Next App",
+  title: "Ausgaben Tracker",
-  description: "Generated by create next app",
+  description: "Eine einfache Anwendung zum Verfolgen von Ausgaben und Einnahmen",
 };
 
 export default function RootLayout({

src/app/page.tsx

@@ -1,103 +1,51 @@
-import Image from "next/image";
+"use client";
+
+import { useState, useEffect } from 'react';
+import { Transaction } from '@/types';
+import TransactionForm from '@/components/TransactionForm';
+import TransactionList from '@/components/TransactionList';
+import Summary from '@/components/Summary';
 
 export default function Home() {
-  return (
+  const [transactions, setTransactions] = useState<Transaction[]>([]);
-    <div className="grid grid-rows-[20px_1fr_20px] items-center justify-items-center min-h-screen p-8 pb-20 gap-16 sm:p-20 font-[family-name:var(--font-geist-sans)]">
-      <main className="flex flex-col gap-[32px] row-start-2 items-center sm:items-start">
-        <Image
-          className="dark:invert"
-          src="/next.svg"
-          alt="Next.js logo"
-          width={180}
-          height={38}
-          priority
-        />
-        <ol className="list-inside list-decimal text-sm/6 text-center sm:text-left font-[family-name:var(--font-geist-mono)]">
-          <li className="mb-2 tracking-[-.01em]">
-            Get started by editing{" "}
-            <code className="bg-black/[.05] dark:bg-white/[.06] px-1 py-0.5 rounded font-[family-name:var(--font-geist-mono)] font-semibold">
-              src/app/page.tsx
-            </code>
-            .
-          </li>
-          <li className="tracking-[-.01em]">
-            Save and see your changes instantly.
-          </li>
-        </ol>
 
-        <div className="flex gap-4 items-center flex-col sm:flex-row">
+  // Load transactions from localStorage on component mount
-          <a
+  useEffect(() => {
-            className="rounded-full border border-solid border-transparent transition-colors flex items-center justify-center bg-foreground text-background gap-2 hover:bg-[#383838] dark:hover:bg-[#ccc] font-medium text-sm sm:text-base h-10 sm:h-12 px-4 sm:px-5 sm:w-auto"
+    const savedTransactions = localStorage.getItem('transactions');
-            href="https://vercel.com/new?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
+    if (savedTransactions) {
-            target="_blank"
+      setTransactions(JSON.parse(savedTransactions));
-            rel="noopener noreferrer"
+    }
-          >
+  }, []);
-            <Image
+
-              className="dark:invert"
+  // Save transactions to localStorage whenever they change
-              src="/vercel.svg"
+  useEffect(() => {
-              alt="Vercel logomark"
+    localStorage.setItem('transactions', JSON.stringify(transactions));
-              width={20}
+  }, [transactions]);
-              height={20}
+
-            />
+  const handleAddTransaction = (transaction: Transaction) => {
-            Deploy now
+    setTransactions([...transactions, transaction]);
-          </a>
+  };
-          <a
+
-            className="rounded-full border border-solid border-black/[.08] dark:border-white/[.145] transition-colors flex items-center justify-center hover:bg-[#f2f2f2] dark:hover:bg-[#1a1a1a] hover:border-transparent font-medium text-sm sm:text-base h-10 sm:h-12 px-4 sm:px-5 w-full sm:w-auto md:w-[158px]"
+  const handleDeleteTransaction = (id: string) => {
-            href="https://nextjs.org/docs?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
+    setTransactions(transactions.filter(transaction => transaction.id !== id));
-            target="_blank"
+  };
-            rel="noopener noreferrer"
+
-          >
+  return (
-            Read our docs
+    <div className="min-h-screen bg-gray-100 py-8">
-          </a>
+      <div className="container mx-auto px-4">
+        <h1 className="text-3xl font-bold text-center mb-8">Ausgaben Tracker</h1>
+        
+        <div className="flex flex-col items-center gap-6">
+          <Summary transactions={transactions} />
+          
+          <TransactionForm onAddTransaction={handleAddTransaction} />
+          
+          <TransactionList 
+            transactions={transactions} 
+            onDeleteTransaction={handleDeleteTransaction} 
+          />
         </div>
-      </main>
+      </div>
-      <footer className="row-start-3 flex gap-[24px] flex-wrap items-center justify-center">
-        <a
-          className="flex items-center gap-2 hover:underline hover:underline-offset-4"
-          href="https://nextjs.org/learn?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          <Image
-            aria-hidden
-            src="/file.svg"
-            alt="File icon"
-            width={16}
-            height={16}
-          />
-          Learn
-        </a>
-        <a
-          className="flex items-center gap-2 hover:underline hover:underline-offset-4"
-          href="https://vercel.com/templates?framework=next.js&utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          <Image
-            aria-hidden
-            src="/window.svg"
-            alt="Window icon"
-            width={16}
-            height={16}
-          />
-          Examples
-        </a>
-        <a
-          className="flex items-center gap-2 hover:underline hover:underline-offset-4"
-          href="https://nextjs.org?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          <Image
-            aria-hidden
-            src="/globe.svg"
-            alt="Globe icon"
-            width={16}
-            height={16}
-          />
-          Go to nextjs.org →
-        </a>
-      </footer>
     </div>
   );
 }

src/components/Summary.tsx

@@ -0,0 +1,42 @@
+import { Transaction } from '@/types';
+
+interface SummaryProps {
+  transactions: Transaction[];
+}
+
+export default function Summary({ transactions }: SummaryProps) {
+  const totalIncome = transactions
+    .filter(t => t.type === 'income')
+    .reduce((sum, transaction) => sum + transaction.amount, 0);
+    
+  const totalExpenses = transactions
+    .filter(t => t.type === 'expense')
+    .reduce((sum, transaction) => sum + transaction.amount, 0);
+    
+  const balance = totalIncome - totalExpenses;
+
+  return (
+    <div className="w-full max-w-md bg-white p-6 rounded-lg shadow-md mb-6">
+      <h2 className="text-xl font-bold mb-4">Zusammenfassung</h2>
+      
+      <div className="grid grid-cols-3 gap-4">
+        <div className="text-center">
+          <p className="text-sm text-gray-500">Einnahmen</p>
+          <p className="text-lg font-medium text-green-600">+{totalIncome.toFixed(2)} €</p>
+        </div>
+        
+        <div className="text-center">
+          <p className="text-sm text-gray-500">Ausgaben</p>
+          <p className="text-lg font-medium text-red-600">-{totalExpenses.toFixed(2)} €</p>
+        </div>
+        
+        <div className="text-center">
+          <p className="text-sm text-gray-500">Bilanz</p>
+          <p className={`text-lg font-medium ${balance >= 0 ? 'text-green-600' : 'text-red-600'}`}>
+            {balance >= 0 ? '+' : ''}{balance.toFixed(2)} €
+          </p>
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/TransactionForm.tsx

@@ -0,0 +1,104 @@
+import { useState } from 'react';
+import { Transaction } from '@/types';
+
+interface TransactionFormProps {
+  onAddTransaction: (transaction: Transaction) => void;
+}
+
+export default function TransactionForm({ onAddTransaction }: TransactionFormProps) {
+  const [description, setDescription] = useState('');
+  const [amount, setAmount] = useState('');
+  const [type, setType] = useState<'expense' | 'income'>('expense');
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    
+    if (!description || !amount) return;
+    
+    const newTransaction: Transaction = {
+      id: Date.now().toString(),
+      description,
+      amount: parseFloat(amount),
+      type,
+      date: new Date().toISOString().split('T')[0]
+    };
+    
+    onAddTransaction(newTransaction);
+    
+    // Reset form
+    setDescription('');
+    setAmount('');
+    setType('expense');
+  };
+
+  return (
+    <form onSubmit={handleSubmit} className="w-full max-w-md bg-white p-6 rounded-lg shadow-md mb-6">
+      <h2 className="text-xl font-bold mb-4">Neue Transaktion</h2>
+      
+      <div className="mb-4">
+        <label htmlFor="description" className="block text-sm font-medium text-gray-700 mb-1">
+          Beschreibung
+        </label>
+        <input
+          type="text"
+          id="description"
+          value={description}
+          onChange={(e) => setDescription(e.target.value)}
+          className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
+          required
+        />
+      </div>
+      
+      <div className="mb-4">
+        <label htmlFor="amount" className="block text-sm font-medium text-gray-700 mb-1">
+          Betrag (€)
+        </label>
+        <input
+          type="number"
+          id="amount"
+          value={amount}
+          onChange={(e) => setAmount(e.target.value)}
+          step="0.01"
+          min="0.01"
+          className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
+          required
+        />
+      </div>
+      
+      <div className="mb-4">
+        <label className="block text-sm font-medium text-gray-700 mb-1">Typ</label>
+        <div className="flex gap-4">
+          <label className="inline-flex items-center">
+            <input
+              type="radio"
+              name="type"
+              value="expense"
+              checked={type === 'expense'}
+              onChange={() => setType('expense')}
+              className="h-4 w-4 text-blue-600 focus:ring-blue-500"
+            />
+            <span className="ml-2">Ausgabe</span>
+          </label>
+          <label className="inline-flex items-center">
+            <input
+              type="radio"
+              name="type"
+              value="income"
+              checked={type === 'income'}
+              onChange={() => setType('income')}
+              className="h-4 w-4 text-blue-600 focus:ring-blue-500"
+            />
+            <span className="ml-2">Einnahme</span>
+          </label>
+        </div>
+      </div>
+      
+      <button
+        type="submit"
+        className="w-full bg-blue-600 text-white py-2 px-4 rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2"
+      >
+        Hinzufügen
+      </button>
+    </form>
+  );
+}

src/components/TransactionList.tsx

@@ -0,0 +1,47 @@
+import { Transaction } from '@/types';
+
+interface TransactionListProps {
+  transactions: Transaction[];
+  onDeleteTransaction: (id: string) => void;
+}
+
+export default function TransactionList({ transactions, onDeleteTransaction }: TransactionListProps) {
+  if (transactions.length === 0) {
+    return (
+      <div className="w-full max-w-md bg-white p-6 rounded-lg shadow-md">
+        <p className="text-center text-gray-500">Keine Transaktionen vorhanden</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="w-full max-w-md bg-white p-6 rounded-lg shadow-md">
+      <h2 className="text-xl font-bold mb-4">Transaktionen</h2>
+      <ul className="divide-y divide-gray-200">
+        {transactions.map((transaction) => (
+          <li key={transaction.id} className="py-4">
+            <div className="flex justify-between">
+              <div>
+                <p className="font-medium">{transaction.description}</p>
+                <p className="text-sm text-gray-500">{transaction.date}</p>
+              </div>
+              <div className="flex items-center gap-3">
+                <span className={`font-medium ${transaction.type === 'income' ? 'text-green-600' : 'text-red-600'}`}>
+                  {transaction.type === 'income' ? '+' : '-'} {transaction.amount.toFixed(2)} €
+                </span>
+                <button 
+                  onClick={() => onDeleteTransaction(transaction.id)}
+                  className="text-gray-400 hover:text-red-500"
+                >
+                  <svg xmlns="http://www.w3.org/2000/svg" className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
+                  </svg>
+                </button>
+              </div>
+            </div>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}

src/types/index.ts

@@ -0,0 +1,7 @@
+export interface Transaction {
+  id: string;
+  description: string;
+  amount: number;
+  type: 'expense' | 'income';
+  date: string;
+}