fully implemented tanstack query

- Added lucide-react to package dependencies
- Refactored MainForm to improve form handling and user selection
- Removed SuccessPage component and related logic
- Updated localization files to include new keys for invoice details
- Created interfaces for form data and messages

.gitignore

@@ -155,8 +155,9 @@ backend/public/uploads/
 secrets/
 keys/
 
+# Own files
 ToDo.txt
-
+PayPal-QR-Code.png
 
 # only in development branch
 next-env.d.ts

backend/routes/default/frontend.data.js

@@ -28,6 +28,9 @@ export const confirmUser = async (username) => {
   ]);
 
   if (rows.length > 0) {
+    const { first_name, last_name } = rows[0];
+    const fullname = first_name + " " + last_name;
+
     // creating userTicketTable
     const d = new Date();
 
@@ -37,8 +40,6 @@ export const confirmUser = async (username) => {
     const date = `${day}_${month}_${year}`;
     const tableName = `${username}_${date}`;
 
-    console.log(tableName);
-
     const [createTable] = await pool.query(
       `CREATE TABLE IF NOT EXISTS ?? (
         id INT AUTO_INCREMENT PRIMARY KEY,
@@ -70,9 +71,9 @@ export const confirmUser = async (username) => {
         nextID = rows.length > 0 ? rows[0].id + 1 : 1;
       };
       await getNextID();
-      return { success: true, nextID, tableName };
+      return { success: true, nextID, tableName, fullname };
     } else {
-      return { success: false, message: "Table creation failed" };
+      return { success: false, message: "Table creation failed", fullname };
     }
   } else {
     return null;

backend/routes/default/frontend.route.js

@@ -11,8 +11,6 @@ router.post("/new-entry", async (req, res) => {
   if (!result.success) {
     return res.status(500).json({ message: "Form Data Invalid" });
   }
-  console.log(req.body);
-  console.log(username);
   res.sendStatus(204);
 });
 

docker-compose.prod.yml

@@ -1,115 +0,0 @@
-services:
-  frontend:
-    container_name: ca-lose-frontend
-    hostname: lose-verkaufen
-    build: ./frontend
-    networks:
-      ca-lose-internal:
-        ipv4_address: 172.25.0.2
-      proxynet:
-        ipv4_address: 172.20.0.61
-    restart: unless-stopped
-
-  backend:
-    container_name: ca-lose-backend
-    hostname: backend
-    build: ./backend
-    environment:
-      NODE_ENV: production
-      DB_HOST: ca-lose-mysql
-      DB_USER: root
-      DB_PASSWORD: ${DB_PASSWORD}
-      DB_NAME: ca_lose
-    depends_on:
-      - database
-    networks:
-      ca-lose-internal:
-        ipv4_address: 172.25.0.3
-    restart: unless-stopped
-
-  database:
-    container_name: ca-lose-mysql
-    hostname: database
-    image: mysql:8.0
-    restart: unless-stopped
-    environment:
-      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD}
-      MYSQL_DATABASE: ca_lose
-      TZ: Europe/Berlin
-    volumes:
-      - ca-lose_mysql:/var/lib/mysql
-      - ./mysql-timezone.cnf:/etc/mysql/conf.d/timezone.cnf:ro
-    networks:
-      ca-lose-internal:
-        ipv4_address: 172.25.0.4
-      proxynet:
-        ipv4_address: 172.20.0.60
-
-  # DNS Server für Hostname-Auflösung innerhalb des VPN
-  dnsmasq:
-    container_name: ca-lose-dns
-    image: andyshinn/dnsmasq:latest
-    restart: unless-stopped
-    cap_add:
-      - NET_ADMIN
-    command: >
-      --no-daemon
-      --log-queries
-      --address=/lose-verkaufen/172.25.0.2
-      --address=/frontend/172.25.0.2
-      --address=/backend/172.25.0.3
-      --address=/database/172.25.0.4
-      --address=/wg-admin/172.25.0.10
-    networks:
-      ca-lose-internal:
-        ipv4_address: 172.25.0.53
-
-  # WireGuard VPN mit Web-UI (wg-easy)
-  wireguard:
-    image: ghcr.io/wg-easy/wg-easy:latest
-    container_name: ca-lose-wireguard
-    cap_add:
-      - NET_ADMIN
-      - SYS_MODULE
-    environment:
-      LANG: de
-      WG_HOST: dus3.the1s.de
-      WG_PORT: "51830"
-      PORT: "51821"
-      WG_DEFAULT_ADDRESS: 10.14.14.x
-      WG_DEFAULT_DNS: "172.25.0.53"
-      WG_ALLOWED_IPS: 172.25.0.0/24
-      WG_PERSISTENT_KEEPALIVE: "25"
-      WG_POST_UP: "iptables -t nat -A POSTROUTING -s 10.14.14.0/24 -o eth0 -j MASQUERADE; iptables -A FORWARD -i wg0 -o eth0 -j ACCEPT; iptables -A FORWARD -i eth0 -o wg0 -m state --state RELATED,ESTABLISHED -j ACCEPT; iptables -A FORWARD -i wg0 -d 172.25.0.2 -j ACCEPT; iptables -A FORWARD -i wg0 -d 172.25.0.53 -j ACCEPT; iptables -A FORWARD -i wg0 -j DROP"
-      WG_POST_DOWN: "iptables -t nat -D POSTROUTING -s 10.14.14.0/24 -o eth0 -j MASQUERADE; iptables -D FORWARD -i wg0 -o eth0 -j ACCEPT; iptables -D FORWARD -i eth0 -o wg0 -m state --state RELATED,ESTABLISHED -j ACCEPT; iptables -D FORWARD -i wg0 -d 172.25.0.2 -j ACCEPT; iptables -D FORWARD -i wg0 -d 172.25.0.53 -j ACCEPT; iptables -D FORWARD -i wg0 -j DROP"
-    volumes:
-      - wireguard-data:/etc/wireguard
-      - /lib/modules:/lib/modules:ro
-    ports:
-      - "51830:51830/udp"
-    sysctls:
-      - net.ipv4.ip_forward=1
-      - net.ipv4.conf.all.src_valid_mark=1
-    restart: unless-stopped
-    depends_on:
-      - dnsmasq
-      - frontend
-    networks:
-      ca-lose-internal:
-        ipv4_address: 172.25.0.10
-      proxynet:
-        ipv4_address: 172.20.0.50
-
-volumes:
-  ca-lose_mysql:
-  wireguard-data:
-
-networks:
-  ca-lose-internal:
-    driver: bridge
-    ipam:
-      config:
-        - subnet: 172.25.0.0/24
-          gateway: 172.25.0.1
-  proxynet:
-    external: true

frontend/README.md

@@ -4,8 +4,8 @@ This template provides a minimal setup to get React working in Vite with HMR and
 
 Currently, two official plugins are available:
 
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) (or [oxc](https://oxc.rs) when used in [rolldown-vite](https://vite.dev/guide/rolldown)) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Oxc](https://oxc.rs)
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/)
 
 ## React Compiler
 

frontend/eslint.config.js

@@ -16,7 +16,6 @@ export default defineConfig([
       reactRefresh.configs.vite,
     ],
     languageOptions: {
-      ecmaVersion: 2020,
       globals: globals.browser,
     },
   },

frontend/index.html

@@ -2,9 +2,20 @@
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
-    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <link
+      rel="icon"
+      type="image/png"
+      href="/favicon-light.png"
+      media="(prefers-color-scheme: light)"
+    />
+    <link
+      rel="icon"
+      type="image/png"
+      href="/favicon-dark.png"
+      media="(prefers-color-scheme: dark)"
+    />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Lose verkaufen</title>
+    <title>Lose Verkaufen</title>
   </head>
   <body>
     <div id="root"></div>

frontend/package.json

@@ -12,37 +12,40 @@
   "dependencies": {
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.1",
-    "@fontsource/roboto": "^5.2.9",
-    "@mui/icons-material": "^7.3.6",
-    "@mui/material": "^7.3.6",
-    "@mui/styled-engine-sc": "^7.3.6",
-    "@tailwindcss/vite": "^4.1.11",
-    "i18next": "^25.7.4",
+    "@fontsource-variable/inter": "^5.2.8",
+    "@fontsource/inter": "^5.2.8",
+    "@mui/icons-material": "^9.0.1",
+    "@mui/joy": "^5.0.0-beta.52",
+    "@mui/material": "^9.0.1",
+    "@tailwindcss/vite": "^4.3.0",
+    "@tanstack/react-query": "^5.100.10",
+    "i18next": "^26.0.10",
     "js-cookie": "^3.0.5",
-    "lucide": "^0.562.0",
-    "lucide-react": "^0.562.0",
-    "react": "^19.2.3",
-    "react-dom": "^19.2.0",
-    "react-i18next": "^16.5.3",
-    "react-router-dom": "^7.11.0",
-    "styled-components": "^6.1.19",
-    "tailwind-merge": "^3.3.1",
-    "tailwindcss": "^4.1.11",
-    "tailwindcss-animate": "^1.0.7"
+    "k6": "^0.0.0",
+    "lucide-react": "^1.14.0",
+    "react": "^17.0.0 || ^18.0.0 || ^19.0.0",
+    "react-dom": "^17.0.0 || ^18.0.0 || ^19.0.0",
+    "react-i18next": "^17.0.7",
+    "react-router-dom": "^7.15.0",
+    "tailwindcss": "^4.3.0"
+  },
+  "peerDependencies": {
+    "react": "^17.0.0 || ^18.0.0 || ^19.0.0",
+    "react-dom": "^17.0.0 || ^18.0.0 || ^19.0.0"
   },
   "devDependencies": {
-    "@eslint/js": "^9.39.1",
+    "@eslint/js": "^10.0.1",
     "@types/js-cookie": "^3.0.6",
-    "@types/node": "^24.10.1",
-    "@types/react": "^19.2.5",
+    "@types/node": "^24.12.2",
+    "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
-    "@vitejs/plugin-react": "^5.1.1",
-    "eslint": "^9.39.1",
-    "eslint-plugin-react-hooks": "^7.0.1",
-    "eslint-plugin-react-refresh": "^0.4.24",
-    "globals": "^16.5.0",
-    "typescript": "~5.9.3",
-    "typescript-eslint": "^8.46.4",
-    "vite": "^7.2.4"
+    "@vitejs/plugin-react": "^6.0.1",
+    "eslint": "^10.2.1",
+    "eslint-plugin-react-hooks": "^7.1.1",
+    "eslint-plugin-react-refresh": "^0.5.2",
+    "globals": "^17.5.0",
+    "typescript": "~6.0.2",
+    "typescript-eslint": "^8.58.2",
+    "vite": "^8.0.10"
   }
 }

frontend/public/favicon.icon/icon.json

@@ -0,0 +1,48 @@
+{
+  "fill" : {
+    "automatic-gradient" : "extended-srgb:0.00000,0.53333,1.00000,1.00000"
+  },
+  "groups" : [
+    {
+      "layers" : [
+        {
+          "blend-mode" : "normal",
+          "fill-specializations" : [
+            {
+              "value" : "automatic"
+            },
+            {
+              "appearance" : "dark",
+              "value" : {
+                "solid" : "extended-srgb:0.00000,0.53333,1.00000,1.00000"
+              }
+            }
+          ],
+          "image-name" : "Unbenannt.png",
+          "name" : "Unbenannt",
+          "position" : {
+            "scale" : 0.9,
+            "translation-in-points" : [
+              0,
+              0
+            ]
+          }
+        }
+      ],
+      "shadow" : {
+        "kind" : "neutral",
+        "opacity" : 0.5
+      },
+      "translucency" : {
+        "enabled" : true,
+        "value" : 0.5
+      }
+    }
+  ],
+  "supported-platforms" : {
+    "circles" : [
+      "watchOS"
+    ],
+    "squares" : "shared"
+  }
+}

frontend/public/vite.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>

frontend/src/App.css

@@ -1 +1,8 @@
 @import "tailwindcss";
+
+html,
+body,
+#root {
+  height: 100%;
+  margin: 0;
+}

frontend/src/assets/react.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>

frontend/src/config/interfaces.config.ts

@@ -0,0 +1,21 @@
+export interface FormData {
+  firstName: string;
+  lastName: string;
+  email: string;
+  phoneNumber: string;
+  tickets: number;
+  companyName: string;
+  cmpFirstName: string;
+  cpmLastName: string;
+  cpmEmail: string;
+  cpmPhoneNumber: string;
+  street: string;
+  postalCode: string;
+  paymentMethod: string;
+}
+
+export interface Message {
+  type: "primary" | "neutral" | "danger" | "success" | "warning";
+  headline: string;
+  text: string;
+}

frontend/src/index.css

@@ -1 +1,12 @@
 @import "tailwindcss";
+
+html,
+body,
+#root {
+  height: 100%;
+  margin: 0;
+}
+
+html {
+  font-size: large;
+}

frontend/src/main.tsx

@@ -1,11 +1,16 @@
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
+import "./utils/i18n/index.ts";
 import "./index.css";
-import "./utils/i18n";
 import App from "./App.tsx";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+
+const queryClient = new QueryClient();
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
+    <QueryClientProvider client={queryClient}>
       <App />
-  </StrictMode>
+    </QueryClientProvider>
+  </StrictMode>,
 );

frontend/src/pages/MainForm.tsx

@@ -1,38 +1,42 @@
-import {
-  TextField,
-  FormControlLabel,
-  Checkbox,
-  Button,
-  Alert,
-  CircularProgress,
-  Autocomplete,
-  Chip,
-  Box,
-  Paper,
-  Typography,
-  IconButton,
-} from "@mui/material";
 import { useTranslation } from "react-i18next";
 import { useState, useEffect } from "react";
-import { submitFormData } from "../utils/sender";
-import Cookies from "js-cookie";
 import * as React from "react";
+import Cookies from "js-cookie";
+import {
+  Sheet,
+  Input,
+  Button,
+  Checkbox,
+  Chip,
+  IconButton,
+  Alert,
+  Typography,
+  FormControl,
+  FormLabel,
+  Autocomplete,
+  ButtonGroup,
+  Modal,
+  ModalDialog,
+  ModalClose,
+  CircularProgress,
+} from "@mui/joy";
+import { submitFormData } from "../utils/api/form";
+import type { FormData, Message } from "../config/interfaces.config";
+import PersonIcon from "@mui/icons-material/Person";
+import QrCodeIcon from "@mui/icons-material/QrCode";
 import TranslateIcon from "@mui/icons-material/Translate";
-import { API_BASE } from "../config/api.config";
+import qrCode from "../assets/PayPal-QR-Code.png";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { confirmUser, fetchUsers } from "../utils/api/users";
 
-interface Message {
-  type: "error" | "info" | "success" | "warning";
-  headline: string;
-  text: string;
-}
+const PAYMENT_METHODS = ["bar", "paypal", "andere"] as const;
+const PAYMENT_LABELS: Record<string, string> = {
+  bar: "Cash",
+  paypal: "PayPal",
+  andere: "Transfer",
+};
 
-export const MainForm = () => {
-  const { t, i18n } = useTranslation();
-  const [invoice, setInvoice] = useState(false);
-  const [msg, setMsg] = useState<Message | null>(null);
-  const [isLoading, setIsLoading] = useState(false);
-  const [nextID, setNextID] = useState<number | null>(null);
-  const [formData, setFormData] = useState({
+const DEFAULT_FORM: FormData = {
   firstName: "",
   lastName: "",
   email: "",
@@ -46,20 +50,124 @@ export const MainForm = () => {
   street: "",
   postalCode: "",
   paymentMethod: "",
+};
+
+// ─── Field component lives OUTSIDE MainForm so React doesn't treat it as a
+// new component type on every render, which would cause inputs to lose focus.
+const Field = ({
+  label,
+  name,
+  type = "text",
+  required = true,
+  formData,
+  onChange,
+}: {
+  label: string;
+  name: keyof FormData;
+  type?: string;
+  required?: boolean;
+  formData: FormData;
+  onChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
+}) => (
+  <FormControl required={required}>
+    <FormLabel>{label}</FormLabel>
+    <Input
+      name={name}
+      type={type}
+      value={formData[name] as string}
+      onChange={onChange}
+      variant="soft"
+      sx={{ borderRadius: "10px" }}
+    />
+  </FormControl>
+);
+
+export const MainForm = () => {
+  const { t, i18n } = useTranslation();
+  const queryClient = useQueryClient();
+
+  const [invoice, setInvoice] = useState(false);
+  const [msg, setMsg] = useState<Message | null>(null);
+  const [nextID, setNextID] = useState<number | null>(null);
+  const [selectedUser, setSelectedUser] = useState("");
+  const [formData, setFormData] = useState<FormData>(DEFAULT_FORM);
+  const [showSelectUser, setShowSelectUser] = useState(false);
+  const [QRmodal, setQRmodal] = useState(false);
+
+  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setFormData({ ...formData, [e.target.name]: e.target.value });
+  };
+
+  useEffect(() => {
+    const savedUser = Cookies.get("selectedUser");
+    if (savedUser) {
+      setSelectedUser(savedUser);
+    }
+  }, []);
+
+  const { data: usernameData, isLoading: usernameDataIsLoading } = useQuery({
+    queryKey: ["users"],
+    queryFn: fetchUsers,
   });
-  const [users, setUsers] = useState<string[]>([]);
-  const [selectedUser, setSelectedUser] = useState<string | null>(null);
+
+  const { data: userData, isSuccess: userDataIsSuccess } = useQuery({
+    queryKey: ["user", selectedUser],
+    enabled: !!selectedUser,
+    queryFn: () => confirmUser(selectedUser),
+  });
+
+  const {
+    mutate: mutateForm,
+    isSuccess: mutateFormIsSuccess,
+    isPending: mutateFormIsPending,
+    isError: mutateFormIsError,
+  } = useMutation({
+    mutationFn: () => submitFormData(formData, selectedUser),
+  });
+
+  // Redirecting to success page if mutation was successful
+  useEffect(() => {
+    if (mutateFormIsSuccess) {
+      queryClient.invalidateQueries({ queryKey: ["user", selectedUser] });
+      document.location.href = `/success?id=${nextID}&tickets=${formData.tickets}`;
+    }
+
+    if (mutateFormIsError) {
+      queryClient.invalidateQueries({ queryKey: ["user", selectedUser] });
+      setMsg({
+        type: "danger",
+        headline: t("error"),
+        text: t("form-submission-failed"),
+      });
+    }
+  }, [mutateFormIsSuccess, mutateFormIsError]);
+
+  // Setting the nextID after a user is selected
+  useEffect(() => {
+    if (!userData) return;
+    setNextID(userData.nextID);
+  }, [userDataIsSuccess]);
+
+  const handleUserSelection = (username: string | null) => {
+    if (username == null || username == "") {
+      return;
+    }
+
+    setSelectedUser(username);
+  };
 
   const changeTranslation = () => {
     const clientLng = i18n.language;
 
     if (clientLng === "en") {
       i18n.changeLanguage("de");
+      Cookies.set("language", "de");
     } else if (clientLng === "de") {
       i18n.changeLanguage("en");
+      Cookies.set("language", "en");
     } else {
       setMsg({
-        type: "error",
+        type: "danger",
         headline: "Error",
         text: "Cannot change langugage.",
       });
@@ -67,448 +175,282 @@ export const MainForm = () => {
   };
 
   useEffect(() => {
-    // Fetch user data or any other data needed for the form
-    try {
-      const fetchUsers = async () => {
-        const response = await fetch(`${API_BASE}/default/users`);
-        const data = await response.json();
-        setUsers(data.users);
-      };
-      fetchUsers();
-      console.log(users);
-    } catch (error) {
-      setMsg({
-        type: "error",
-        headline: t("error"),
-        text: t("failed-to-load-users"),
-      });
-      console.error("Error fetching users:", error);
+    if (formData.paymentMethod === "paypal") {
+      setQRmodal(true);
     }
+  }, [formData.paymentMethod]);
 
-    if (Cookies.get("selectedUser")) {
-      const cookieUser = Cookies.get("selectedUser")!;
-      setSelectedUser(cookieUser);
-      confirmUser(cookieUser);
-    }
-  }, [isLoading]);
-
-  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
-    setFormData({ ...formData, [e.target.name]: e.target.value });
-  };
-
-  const confirmUser = async (selectedUser: string) => {
-    try {
-      const response = await fetch(
-        `${API_BASE}/default/confirm-user?username=${selectedUser}`,
-      );
-      const data = await response.json();
-      setNextID(data.nextID);
-    } catch (error) {
-      console.error("Error confirming user:", error);
-    }
-  };
-
-  const handleUserSelection = (selectedUser: string | null) => {
-    if (!selectedUser) return;
-    setSelectedUser(selectedUser);
-    confirmUser(selectedUser);
-    Cookies.set("selectedUser", selectedUser);
-  };
-
-  const handleSubmit = async () => {
-    setIsLoading(true);
-    try {
-      const result = await submitFormData(formData, selectedUser || "");
-      if (result.success) {
-        document.location.href = `/success?id=${nextID}&tickets=${formData.tickets}`;
-      } else {
-        setMsg({
-          type: "error",
-          headline: t("error"),
-          text: result.error || t("form-submission-failed"),
-        });
-      }
-    } finally {
-      setIsLoading(false);
-    }
-  };
+  // Shorthand so we don't repeat formData + onChange on every Field usage
+  const fieldProps = { formData, onChange: handleChange };
 
   return (
-    <Box
-      className="bg-gray-100 py-10 px-4"
-      sx={{
-        minHeight: "100vh",
+    <>
+      <Modal open={showSelectUser}>
+        <ModalDialog color="primary" layout="center" size="lg">
+          <ModalClose onClick={() => setShowSelectUser(false)} />
+          <Typography>{t("user")}</Typography>
+          {/* User selection */}
+          <Autocomplete
+            options={usernameData?.users ?? []}
+            loading={usernameDataIsLoading}
+            loadingText={t("loading")}
+            value={selectedUser}
+            onChange={(_, value) => handleUserSelection(value)}
+            placeholder={t("user")}
+            variant="soft"
+            sx={{ borderRadius: "10px" }}
+          />
+        </ModalDialog>
+      </Modal>
+      <Modal open={QRmodal}>
+        <ModalDialog color="primary" layout="center" size="lg">
+          <ModalClose onClick={() => setQRmodal(false)} />
+          <Typography>{t("qr-text")}</Typography>
+          <img
+            src={qrCode}
+            alt="PayPal QR Code"
+            style={{
               width: "100%",
-        display: "flex",
-        alignItems: "center",
-        justifyContent: "center",
+              height: "auto",
+              maxHeight: "70vh",
+              objectFit: "contain",
             }}
-    >
-      <Paper
-        elevation={6}
-        className="w-full rounded-2xl"
+          />
+        </ModalDialog>
+      </Modal>
+
+      <div className="min-h-screen w-full flex items-center justify-center from-slate-100 to-blue-50 p-4">
+        <Sheet
+          variant="plain"
+          className="w-full"
           sx={{
             position: "relative",
-          backgroundColor: "#fff",
-          boxShadow: "0 25px 50px -12px rgba(0, 0, 0, 0.25)",
-          width: "100%",
-          maxWidth: {
-            xs: 360, // kompakte Handy-Ansicht
-            sm: 420, // kleine Tablets / große Phones
-            md: 480, // Desktop, bleibt angenehm schmal
-          },
-          padding: {
-            xs: "1.5rem",
-            sm: "2rem",
-          },
+            maxWidth: 460,
+            borderRadius: "24px",
+            p: { xs: "1.5rem", sm: "2rem" },
+            boxShadow: "0 24px 64px -12px rgba(0,0,0,0.18)",
+            background: "#fff",
           }}
         >
-        <Box sx={{ position: "absolute", top: 12, right: 12 }}>
-          <IconButton
-            onClick={() => changeTranslation()}
-            aria-label="translate"
+          <ButtonGroup
+            color="primary"
+            disabled={false}
+            size="lg"
+            spacing={1}
+            variant="soft"
           >
+            <IconButton onClick={() => setShowSelectUser(true)}>
+              <PersonIcon />
+            </IconButton>
+            <IconButton onClick={() => setQRmodal(true)}>
+              <QrCodeIcon />
+            </IconButton>
+            {/* Language toggle */}
+            <IconButton onClick={changeTranslation}>
               <TranslateIcon />
             </IconButton>
-        </Box>
+            <Typography
+              level="title-sm"
+              textColor="var(--joy-palette-success-plainColor)"
+              sx={{
+                fontFamily: "monospace",
+                opacity: "100%",
+                alignSelf: "center",
+              }}
+            >
+              {`${t("greeting")} ${userData?.fullname ?? t("loading")}`}
+            </Typography>
+          </ButtonGroup>
+
           <form
             onSubmit={(e) => {
               e.preventDefault();
-            handleSubmit();
+              mutateForm();
             }}
             className="flex flex-col gap-4"
           >
-          {/* User Selection */}
-          <Autocomplete
-            disablePortal
-            options={users}
-            value={selectedUser}
-            fullWidth
-            renderInput={(params) => (
-              <TextField {...params} label={t("user")} variant="filled" />
-            )}
-            onChange={(_event, value) => handleUserSelection(value)}
-            onKeyDown={(event) => {
-              if (event.key === "Enter") {
-                event.defaultMuiPrevented = true;
-              }
-            }}
-          />
-
-          {/* Next ID Chip */}
+            {/* Next ID badge */}
             <Chip
-            label={`#${nextID ?? "N/A"}`}
-            color="primary"
+              size="lg"
+              variant="solid"
+              color="neutral"
               sx={{
                 alignSelf: "flex-start",
-              fontWeight: 500,
-              fontSize: "0.9rem",
-              mt: 0.5,
-              mb: 0.5,
-              py: 0.5,
-              px: 1.25,
                 borderRadius: "999px",
-              background: "linear-gradient(135deg, #1976d2 0%, #1565c0 100%)",
+                fontWeight: 600,
+                marginTop: 1,
               }}
-          />
+            >
+              #{nextID ?? "N/A"}
+            </Chip>
 
-          {/* Name Fields - Two Columns */}
-          <Box className="grid grid-cols-2 gap-3">
-            <TextField
-              required
-              id="first-name"
-              label={t("first-name")}
-              variant="filled"
-              value={formData.firstName}
-              onChange={handleChange}
-              name="firstName"
-              fullWidth
-            />
-            <TextField
-              required
-              id="last-name"
-              label={t("last-name")}
-              variant="filled"
-              value={formData.lastName}
-              onChange={handleChange}
-              name="lastName"
-              fullWidth
-            />
-          </Box>
+            {/* Name row */}
+            <div className="grid grid-cols-2 gap-3">
+              <Field label={t("first-name")} name="firstName" {...fieldProps} />
+              <Field label={t("last-name")} name="lastName" {...fieldProps} />
+            </div>
 
-          {/* Email */}
-          <TextField
-            required
-            id="email"
+            <Field
               label={t("email")}
-            variant="filled"
-            type="email"
-            value={formData.email}
-            onChange={handleChange}
               name="email"
-            fullWidth
+              type="email"
+              {...fieldProps}
             />
-
-          {/* Phone Number */}
-          <TextField
-            required
-            id="phone-number"
+            <Field
               label={t("phone-number")}
-            variant="filled"
-            type="tel"
-            value={formData.phoneNumber}
-            onChange={handleChange}
               name="phoneNumber"
-            fullWidth
+              type="tel"
+              {...fieldProps}
             />
 
-          {/* Tickets and Invoice Checkbox */}
-          <Box className="grid grid-cols-2 gap-3 items-center">
-            <TextField
-              required
-              id="tickets"
+            {/* Tickets + Invoice toggle */}
+            <div className="grid grid-cols-2 gap-3 items-end">
+              <FormControl required>
+                <FormLabel>{t("tickets")}</FormLabel>
+                <Input
+                  name="tickets"
                   type="number"
-              label={t("tickets")}
-              variant="filled"
                   value={formData.tickets}
                   onChange={handleChange}
-              name="tickets"
-              fullWidth
-              inputProps={{ min: 1 }}
+                  slotProps={{ input: { min: 1 } }}
+                  variant="soft"
+                  sx={{ borderRadius: "10px" }}
                 />
-            <FormControlLabel
-              control={
+              </FormControl>
+              <div className="flex items-center pb-2">
                 <Checkbox
                   checked={invoice}
                   onChange={(e) => setInvoice(e.target.checked)}
-                />
-              }
                   label={t("invoice")}
-              className="justify-end"
+                  variant="outlined"
                 />
-          </Box>
+              </div>
+            </div>
 
-          {/* Invoice Fields */}
+            {/* Invoice details (conditional) */}
             {invoice && (
-            <Box
-              className="flex flex-col gap-2 pt-3 mt-2"
-              sx={{
-                borderTop: "2px solid",
-                borderColor: "primary.light",
-                borderRadius: "0",
-              }}
-            >
-              <TextField
-                required
-                id="company-name"
-                label={t("company-name")}
-                variant="filled"
-                value={formData.companyName}
-                onChange={handleChange}
-                name="companyName"
-                fullWidth
-              />
-
-              {/* Invoice Name Fields - Two Columns */}
-              <Box className="grid grid-cols-2 gap-3">
-                <TextField
-                  required
-                  id="first-name_invoice"
-                  label={t("first-name")}
-                  variant="filled"
-                  value={formData.cmpFirstName}
-                  onChange={handleChange}
-                  name="cmpFirstName"
-                  fullWidth
-                />
-                <TextField
-                  required
-                  id="last-name_invoice"
-                  label={t("last-name")}
-                  variant="filled"
-                  value={formData.cpmLastName}
-                  onChange={handleChange}
-                  name="cpmLastName"
-                  fullWidth
-                />
-              </Box>
-
-              <TextField
-                required
-                id="street"
-                label={t("street")}
-                variant="filled"
-                value={formData.street}
-                onChange={handleChange}
-                name="street"
-                fullWidth
-              />
-
-              <TextField
-                required
-                id="postal-code"
-                label={t("postal-code")}
-                variant="filled"
-                value={formData.postalCode}
-                onChange={handleChange}
-                name="postalCode"
-                fullWidth
-              />
-
-              <TextField
-                required
-                id="phone-number_invoice"
-                label={t("phone-number")}
-                variant="filled"
-                type="tel"
-                value={formData.cpmPhoneNumber}
-                onChange={handleChange}
-                name="cpmPhoneNumber"
-                fullWidth
-              />
-
-              <TextField
-                required
-                id="email_invoice"
-                label={t("email")}
-                variant="filled"
-                type="email"
-                value={formData.cpmEmail}
-                onChange={handleChange}
-                name="cpmEmail"
-                fullWidth
-              />
-            </Box>
-          )}
-          {/* Payment Methods */}
-          <Box className="flex flex-col gap-2 mt-2">
-            <Typography
-              component="label"
-              sx={{
-                fontSize: "0.875rem",
-                fontWeight: 500,
-                color: "text.secondary",
-                display: "flex",
-                alignItems: "center",
-                gap: 0.5,
-              }}
-            >
-              {t("select-payment-method")} *
+              <div className="flex flex-col gap-3 pt-4 border-t border-blue-200">
+                <Typography level="title-sm" color="primary">
+                  {t("invoice-details")}
                 </Typography>
-            <Box className="flex gap-2 flex-wrap">
+                <Field
+                  label={t("company-name")}
+                  name="companyName"
+                  {...fieldProps}
+                />
+                <div className="grid grid-cols-2 gap-3">
+                  <Field
+                    label={t("first-name")}
+                    name="cmpFirstName"
+                    {...fieldProps}
+                  />
+                  <Field
+                    label={t("last-name")}
+                    name="cpmLastName"
+                    {...fieldProps}
+                  />
+                </div>
+                <Field label={t("street")} name="street" {...fieldProps} />
+                <Field
+                  label={t("postal-code")}
+                  name="postalCode"
+                  {...fieldProps}
+                />
+                <Field
+                  label={t("phone-number")}
+                  name="cpmPhoneNumber"
+                  type="tel"
+                  {...fieldProps}
+                />
+                <Field
+                  label={t("email")}
+                  name="cpmEmail"
+                  type="email"
+                  {...fieldProps}
+                />
+              </div>
+            )}
+
+            {/* Payment method selection */}
+            <FormControl required>
+              <FormLabel>{t("select-payment-method")}</FormLabel>
+              <div className="flex gap-2 flex-wrap mt-1">
+                {PAYMENT_METHODS.map((method) => (
                   <Button
+                    key={method}
                     variant={
-                  formData.paymentMethod === "bar" ? "contained" : "outlined"
+                      formData.paymentMethod === method ? "solid" : "soft"
                     }
+                    color="primary"
                     onClick={() =>
-                  setFormData({ ...formData, paymentMethod: "bar" })
+                      setFormData((prev) => ({
+                        ...prev,
+                        paymentMethod: method,
+                      }))
                     }
                     sx={{
                       flex: 1,
-                  minWidth: "100px",
-                  py: 1.5,
+                      minWidth: "90px",
                       borderRadius: "12px",
+                      py: 1.5,
                       textTransform: "none",
-                  fontWeight: formData.paymentMethod === "bar" ? 600 : 400,
+                      fontWeight: formData.paymentMethod === method ? 700 : 400,
                     }}
                   >
-                {t("cash")}
+                    {PAYMENT_LABELS[method]}
                   </Button>
-              <Button
-                variant={
-                  formData.paymentMethod === "paypal" ? "contained" : "outlined"
-                }
-                onClick={() =>
-                  setFormData({ ...formData, paymentMethod: "paypal" })
-                }
-                sx={{
-                  flex: 1,
-                  minWidth: "100px",
-                  py: 1.5,
-                  borderRadius: "12px",
-                  textTransform: "none",
-                  fontWeight: formData.paymentMethod === "paypal" ? 600 : 400,
-                }}
-              >
-                {t("paypal")}
-              </Button>
-              <Button
-                variant={
-                  formData.paymentMethod === "andere" ? "contained" : "outlined"
-                }
-                onClick={() =>
-                  setFormData({ ...formData, paymentMethod: "andere" })
-                }
-                sx={{
-                  flex: 1,
-                  minWidth: "100px",
-                  py: 1.5,
-                  borderRadius: "12px",
-                  textTransform: "none",
-                  fontWeight: formData.paymentMethod === "andere" ? 600 : 400,
-                }}
-              >
-                {t("transfer")}
-              </Button>
-            </Box>
+                ))}
+              </div>
+              {/* Hidden required input to enforce payment selection on submit */}
               {!formData.paymentMethod && (
                 <input
                   tabIndex={-1}
-                autoComplete="off"
+                  required
+                  value=""
+                  onChange={() => {}}
                   style={{
                     opacity: 0,
                     width: 0,
                     height: 0,
                     position: "absolute",
                   }}
-                required
-                value={formData.paymentMethod}
-                onChange={() => {}}
                 />
               )}
-          </Box>
+            </FormControl>
 
-          {/* Submit Button */}
+            {mutateFormIsPending ? (
+              <div className="flex items-center justify-center">
+                <CircularProgress />
+              </div>
+            ) : (
               <Button
                 type="submit"
-            variant="contained"
-            disabled={isLoading || !formData.paymentMethod}
-            fullWidth
-            size="large"
+                disabled={!formData.paymentMethod}
+                size="lg"
                 sx={{
-              mt: 3,
-              py: 2,
-              textTransform: "uppercase",
-              fontWeight: "bold",
-              borderRadius: "12px",
-              fontSize: "1rem",
-              background: "linear-gradient(135deg, #1976d2 0%, #1565c0 100%)",
-              boxShadow: "0 4px 14px 0 rgba(25, 118, 210, 0.39)",
+                  mt: 2,
+                  borderRadius: "14px",
+                  fontWeight: 700,
+                  letterSpacing: "0.05em",
+                  background: "linear-gradient(135deg, #2563eb, #1d4ed8)",
                   "&:hover": {
-                background: "linear-gradient(135deg, #1565c0 0%, #0d47a1 100%)",
-                boxShadow: "0 6px 20px 0 rgba(25, 118, 210, 0.5)",
-              },
-              "&:disabled": {
-                background: "#e0e0e0",
-                boxShadow: "none",
+                    background: "linear-gradient(135deg, #1d4ed8, #1e40af)",
                   },
                 }}
               >
-            {isLoading ? (
-              <CircularProgress size={24} color="inherit" />
-            ) : (
-              t("submit")
-            )}
+                {t("submit")}
               </Button>
+            )}
 
-          {/* Alert Message */}
+            {/* Alert message */}
             {msg && (
-            <Alert severity={msg.type} sx={{ mt: 2 }}>
-              {msg.headline}: {msg.text}
+              <Alert color={msg.type} sx={{ borderRadius: "12px" }}>
+                <strong>{msg.headline}:</strong> {msg.text}
               </Alert>
             )}
           </form>
-      </Paper>
-    </Box>
+        </Sheet>
+      </div>
+    </>
   );
 };

frontend/src/pages/SuccessPage.tsx

@@ -1,23 +1,20 @@
-import { Box, Paper, Typography, Chip, Button } from "@mui/material";
 import { useEffect, useState } from "react";
 import { CircleCheck } from "lucide-react";
 import { useTranslation } from "react-i18next";
+import { Sheet, Typography, Chip, Button } from "@mui/joy";
 
 export const SuccessPage = () => {
-  const [orderId, setOrderId] = useState<string | null>(null);
-  const [tickets, setNumberOfTickets] = useState<number>(0);
-  const [animate, setAnimate] = useState(false);
   const { t } = useTranslation();
+  const [orderId, setOrderId] = useState<string | null>(null);
+  const [tickets, setTickets] = useState<number>(0);
+  const [animate, setAnimate] = useState(false);
   const [seconds, setSeconds] = useState(30);
 
   useEffect(() => {
     const params = new URLSearchParams(window.location.search);
-    const id = params.get("id");
-    const numberOfTickets = params.get("tickets");
-
-    setOrderId(id);
-    setNumberOfTickets(numberOfTickets ? parseInt(numberOfTickets, 10) : 0);
-
+    setOrderId(params.get("id"));
+    setTickets(parseInt(params.get("tickets") ?? "0", 10));
+    // Small delay so the CSS transition actually plays
     setTimeout(() => setAnimate(true), 100);
   }, []);
 
@@ -26,185 +23,153 @@ export const SuccessPage = () => {
       window.location.href = "/";
       return;
     }
-
-    const timer = setTimeout(() => setSeconds(seconds - 1), 1000);
-
+    const timer = setTimeout(() => setSeconds((s) => s - 1), 1000);
     return () => clearTimeout(timer);
   }, [seconds]);
 
+  // Returns a style object that slides the element up + fades it in.
+  // Each section gets a slightly later delay for a staggered entrance.
+  const fadeUp = (delay: string): React.CSSProperties => ({
+    transition: `opacity 0.5s ease-in-out ${delay}, transform 0.5s ease-in-out ${delay}`,
+    transform: animate ? "translateY(0)" : "translateY(20px)",
+    opacity: animate ? 1 : 0,
+  });
+
   return (
-    <Box className="min-h-screen bg-gray-800 flex items-center justify-center p-4">
-      <Paper
-        elevation={3}
-        className="w-full max-w-md p-8 rounded-lg"
+    <div className="min-h-screen w-full flex items-center justify-center bg-linear-to-br from-slate-800 to-slate-900 p-4">
+      <Sheet
+        variant="plain"
         sx={{
-          backgroundColor: "#fff",
-          textAlign: "center",
           position: "relative",
+          width: "100%",
+          maxWidth: 440,
+          borderRadius: "24px",
+          p: { xs: "2rem", sm: "2.5rem" },
+          boxShadow: "0 24px 64px -12px rgba(0,0,0,0.4)",
+          background: "#fff",
+          textAlign: "center",
           overflow: "hidden",
         }}
       >
-        {/* Animated Success Icon */}
-        <Box
-          sx={{
-            display: "flex",
-            justifyContent: "center",
-            mb: 3,
-            transition: "all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1)",
-            transform: animate ? "scale(1)" : "scale(0)",
-            opacity: animate ? 1 : 0,
-          }}
-        >
-          <CircleCheck size={80} className="text-green-500" strokeWidth={2.5} />
-        </Box>
-
-        {/* Success Message */}
-        <Typography
-          variant="h4"
-          component="h1"
-          gutterBottom
-          sx={{
-            fontWeight: "bold",
-            color: "#2e7d32",
-            mb: 2,
-            transition: "all 0.5s ease-in-out 0.2s",
-            transform: animate ? "translateY(0)" : "translateY(20px)",
-            opacity: animate ? 1 : 0,
-          }}
-        >
-          {t("form-submitted-successfully")}
-        </Typography>
-
-        <Typography
-          variant="body1"
-          sx={{
-            color: "#666",
-            mb: 3,
-            transition: "all 0.5s ease-in-out 0.3s",
-            transform: animate ? "translateY(0)" : "translateY(20px)",
-            opacity: animate ? 1 : 0,
-          }}
-        >
-          {t("ticket-payment", { count: tickets })}
-        </Typography>
-
-        {/* Tickets Display */}
-        {tickets > 0 && (
-          <Box
-            sx={{
-              mb: 2,
-              transition: "all 0.5s ease-in-out 0.35s",
-              transform: animate ? "translateY(0)" : "translateY(20px)",
-              opacity: animate ? 1 : 0,
-            }}
-          >
-            <Chip
-              label={`${tickets} ${tickets === 1 ? t("ticket") : t("tickets")}`}
-              color="secondary"
-              sx={{
-                fontWeight: "bold",
-                fontSize: "1rem",
-                py: 2.5,
-                px: 2,
-              }}
-            />
-          </Box>
-        )}
-
-        {/* Order ID Display */}
-        {orderId && (
-          <Box
-            sx={{
-              mb: 3,
-              transition: "all 0.5s ease-in-out 0.4s",
-              transform: animate ? "translateY(0)" : "translateY(20px)",
-              opacity: animate ? 1 : 0,
-            }}
-          >
-            <Typography
-              variant="body2"
-              sx={{
-                color: "#888",
-                mb: 1,
-                fontSize: "0.875rem",
-              }}
-            >
-              {t("entry-id")}
-            </Typography>
-            <Chip
-              label={`#${orderId}`}
-              color="primary"
-              sx={{
-                fontWeight: "bold",
-                fontSize: "1.25rem",
-                py: 3,
-                px: 2,
-              }}
-            />
-          </Box>
-        )}
-
-        {/* Return button */}
-        <Box
-          sx={{
-            mb: 3,
-            transition: "all 0.5s ease-in-out 0.4s",
-            transform: animate ? "translateY(0)" : "translateY(20px)",
-            opacity: animate ? 1 : 0,
-          }}
-        >
-          <Button
-            href="/"
-            variant="contained"
-            color="primary"
-            sx={{
-              fontWeight: "bold",
-              fontSize: "1.25rem",
-              py: 3,
-              px: 2,
-            }}
-          >
-            {seconds + " " + t("return-to-homepage")}
-          </Button>
-        </Box>
-
-        {/* Additional Info */}
-        <Box
-          sx={{
-            mt: 4,
-            pt: 3,
-            borderTop: "1px solid #e0e0e0",
-            transition: "all 0.5s ease-in-out 0.5s",
-            transform: animate ? "translateY(0)" : "translateY(20px)",
-            opacity: animate ? 1 : 0,
-          }}
-        >
-          <Typography
-            variant="body2"
-            sx={{
-              color: "#666",
-              lineHeight: 1.6,
-            }}
-          >
-            {t("thank-you")}
-          </Typography>
-        </Box>
-
-        {/* Decorative Elements */}
-        <Box
-          sx={{
+        {/* Green accent bar at the top */}
+        <div
+          style={{
             position: "absolute",
             top: 0,
             left: 0,
             right: 0,
             height: "4px",
-            background: "linear-gradient(90deg, #4caf50 0%, #81c784 100%)",
-            transition: "all 0.8s ease-in-out 0.6s",
+            background: "linear-gradient(90deg, #22c55e, #86efac)",
+            transition: "transform 0.8s ease-in-out 0.6s",
             transform: animate ? "scaleX(1)" : "scaleX(0)",
             transformOrigin: "left",
           }}
         />
-      </Paper>
-    </Box>
+
+        {/* Animated success icon */}
+        <div
+          style={{
+            display: "flex",
+            justifyContent: "center",
+            marginBottom: "1.5rem",
+            transition: "all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1)",
+            transform: animate ? "scale(1)" : "scale(0)",
+            opacity: animate ? 1 : 0,
+          }}
+        >
+          <CircleCheck size={80} color="#22c55e" strokeWidth={2.5} />
+        </div>
+
+        {/* Headline */}
+        <div style={fadeUp("0.2s")}>
+          <Typography
+            level="h3"
+            sx={{ fontWeight: 700, color: "#15803d", mb: 1 }}
+          >
+            {t("form-submitted-successfully")}
+          </Typography>
+        </div>
+
+        {/* Subtitle */}
+        <div style={fadeUp("0.3s")}>
+          <Typography level="body-md" sx={{ color: "#6b7280", mb: 3 }}>
+            {t("ticket-payment", { count: tickets })}
+          </Typography>
+        </div>
+
+        {/* Tickets chip */}
+        {tickets > 0 && (
+          <div style={fadeUp("0.35s")} className="flex justify-center mb-3">
+            <Chip
+              size="lg"
+              variant="soft"
+              color="success"
+              sx={{ fontWeight: 700, fontSize: "1rem", px: 2, py: 1 }}
+            >
+              {tickets} {tickets === 1 ? t("ticket") : t("tickets")}
+            </Chip>
+          </div>
+        )}
+
+        {/* Order ID chip */}
+        {orderId && (
+          <div
+            style={fadeUp("0.4s")}
+            className="flex flex-col items-center gap-1 mb-4"
+          >
+            <Typography
+              level="body-xs"
+              sx={{
+                color: "#9ca3af",
+                textTransform: "uppercase",
+                letterSpacing: "0.08em",
+              }}
+            >
+              {t("entry-id")}
+            </Typography>
+            <Chip
+              size="lg"
+              variant="solid"
+              color="primary"
+              sx={{ fontWeight: 700, fontSize: "1.25rem", px: 3, py: 1.5 }}
+            >
+              #{orderId}
+            </Chip>
+          </div>
+        )}
+
+        {/* Return button with countdown */}
+        <div style={fadeUp("0.45s")} className="mb-4">
+          <Button
+            component="a"
+            href="/"
+            size="lg"
+            color="primary"
+            variant="solid"
+            fullWidth
+            sx={{
+              borderRadius: "12px",
+              fontWeight: 700,
+              background: "linear-gradient(135deg, #2563eb, #1d4ed8)",
+              "&:hover": {
+                background: "linear-gradient(135deg, #1d4ed8, #1e40af)",
+              },
+            }}
+          >
+            {seconds}s &mdash; {t("return-to-homepage")}
+          </Button>
+        </div>
+
+        {/* Thank-you note */}
+        <div style={fadeUp("0.5s")} className="pt-4 border-t border-slate-100">
+          <Typography
+            level="body-sm"
+            sx={{ color: "#9ca3af", lineHeight: 1.6 }}
+          >
+            {t("thank-you")}
+          </Typography>
+        </div>
+      </Sheet>
+    </div>
   );
 };

frontend/src/utils/api/form.ts

@@ -0,0 +1,26 @@
+import { API_BASE } from "../../config/api.config";
+import type { FormData } from "../../config/interfaces.config";
+
+export const submitFormData = async (data: FormData, username: string) => {
+  console.warn("submitFormData is fetching!");
+
+  await new Promise((resolve) => setTimeout(resolve, 3000)); // Wait 3 seconds
+
+  const response = await fetch(
+    `${API_BASE}/default/new-entry?username=${username}`,
+    {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(data),
+    },
+  );
+
+  if (!response.ok) {
+    const error = await response.text();
+    throw new Error(error || "Form submission failed");
+  }
+
+  return;
+};

frontend/src/utils/api/users.ts

@@ -0,0 +1,21 @@
+import { API_BASE } from "../../config/api.config";
+import Cookies from "js-cookie";
+
+export const fetchUsers = async () => {
+  console.warn("fetchUsers is fetching!");
+
+  const response = await fetch(`${API_BASE}/default/users`);
+  const data = await response.json();
+
+  return data;
+};
+
+export const confirmUser = async (username: string) => {
+  console.warn("confirmUser is fetching!");
+  const response = await fetch(
+    `${API_BASE}/default/confirm-user?username=${username}`,
+  );
+  const data = await response.json();
+  Cookies.set("selectedUser", username);
+  return data;
+};

frontend/src/utils/i18n/locales/de/de.json

@@ -4,6 +4,7 @@
     "phone-number": "Telefonnummer",
     "tickets": "Lose",
     "invoice": "Rechnung",
+    "invoice-details": "Rechnungsdetails",
     "company-name": "Firmenname",
     "street": "Straße + Haus Nr.",
     "postal-code": "Plz + Stadt",
@@ -13,7 +14,7 @@
     "user": "Benutzer",
     "next-id": "Nächste Eintragsnummer: ",
     "form-submitted-successfully": "Formular erfolgreich übermittelt!",
-    "orm-submission-failed": "Formularübermittlung fehlgeschlagen.",
+    "form-submission-failed": "Formularübermittlung fehlgeschlagen.",
     "success": "Erfolg",
     "error": "Fehler",
     "cash": "Bar",
@@ -24,5 +25,8 @@
     "entry-id": "Eintrags-ID",
     "thank-you": "Vielen Dank für Ihre Unterstützung der Claudius Akademie! Wir wünschen Ihnen viel Glück mit dem Los.",
     "select-payment-method": "Zahlungsmethode auswählen",
-    "return-to-homepage": "Zurück"
+    "return-to-homepage": "Zurück",
+    "qr-text": "PayPal QR-Code der Claudius Akademie",
+    "loading": "Lädt...",
+    "greeting": "Hallo,"
 }

frontend/src/utils/i18n/locales/en/en.json

@@ -3,6 +3,7 @@
     "last-name": "Last Name",
     "phone-number": "Phone Number",
     "invoice": "Invoice",
+    "invoice-details": "Invoice Details",
     "company-name": "Company Name",
     "street": "Street + House No.",
     "postal-code": "Postal Code + City",
@@ -25,5 +26,8 @@
     "entry-id": "Entry ID",
     "thank-you": "Thank you for supporting the Claudius Akademie! We wish you the best of luck with your ticket.",
     "select-payment-method": "Select Payment Method",
-    "return-to-homepage": "Return"
+    "return-to-homepage": "Return",
+    "qr-text": "PayPal QR-Code from the Claudius Akademie",
+    "loading": "Loading...",
+    "greeting": "Hello,"
 }

frontend/src/utils/sender.ts

@@ -1,42 +0,0 @@
-import { API_BASE } from "../config/api.config";
-
-interface FormData {
-  firstName: string;
-  lastName: string;
-  email: string;
-  phoneNumber: string;
-  tickets: number;
-  companyName: string;
-  cmpFirstName: string;
-  cpmLastName: string;
-  cpmEmail: string;
-  cpmPhoneNumber: string;
-  street: string;
-  postalCode: string;
-  paymentMethod: string;
-}
-
-export const submitFormData = async (data: FormData, username: string) => {
-  console.log(data);
-  try {
-    const response = await fetch(
-      `${API_BASE}/default/new-entry?username=${username}`,
-      {
-        method: "POST",
-        headers: {
-          "Content-Type": "application/json",
-        },
-        body: JSON.stringify(data),
-      },
-    );
-
-    if (!response.ok) {
-      const errorText = await response.text();
-      return { success: false, error: `Server error: ${errorText}` };
-    }
-
-    return { success: true };
-  } catch (error) {
-    return { success: false, error: (error as Error).message };
-  }
-};

frontend/tailwind.config.js

@@ -1,11 +0,0 @@
-module.exports = {
-  content: [
-    "./index.html",
-    "./src/**/*.{js,jsx,ts,tsx}",
-    // add other paths if needed
-  ],
-  theme: {
-    extend: {},
-  },
-  plugins: [],
-};

frontend/tests/test.local.js

@@ -0,0 +1,13 @@
+import http from "k6/http";
+import { sleep } from "k6";
+
+export const options = {
+  vus: 100, // amount of users
+  duration: "60s", // duration of the test
+};
+
+export default function () {
+  http.get("http://localhost:8004/default/confirm-user?username=TheisGaedigk");
+  http.get("http://localhost:8004/default/users");
+  sleep(1);
+}

frontend/tests/test.server.js

@@ -0,0 +1,15 @@
+// Before running: Establish VPN connection first
+
+import http from "k6/http";
+import { sleep } from "k6";
+
+export const options = {
+  vus: 100, // amount of users
+  duration: "60s", // duration of the test
+};
+
+export default function () {
+  http.get("http://backend:8004/default/confirm-user?username=TheisGaedigk");
+  http.get("http://backend:8004/default/users");
+  sleep(0.5);
+}

frontend/tsconfig.app.json

@@ -1,10 +1,9 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
-    "target": "ES2022",
-    "useDefineForClassFields": true,
-    "lib": ["ES2022", "DOM", "DOM.Iterable"],
-    "module": "ESNext",
+    "target": "es2023",
+    "lib": ["ES2023", "DOM"],
+    "module": "esnext",
     "types": ["vite/client"],
     "skipLibCheck": true,
 
@@ -17,12 +16,10 @@
     "jsx": "react-jsx",
 
     /* Linting */
-    "strict": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "erasableSyntaxOnly": true,
-    "noFallthroughCasesInSwitch": true,
-    "noUncheckedSideEffectImports": true
+    "noFallthroughCasesInSwitch": true
   },
   "include": ["src"]
 }

frontend/tsconfig.node.json

@@ -1,9 +1,9 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
-    "target": "ES2023",
+    "target": "es2023",
     "lib": ["ES2023"],
-    "module": "ESNext",
+    "module": "esnext",
     "types": ["node"],
     "skipLibCheck": true,
 
@@ -15,12 +15,10 @@
     "noEmit": true,
 
     /* Linting */
-    "strict": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "erasableSyntaxOnly": true,
-    "noFallthroughCasesInSwitch": true,
-    "noUncheckedSideEffectImports": true
+    "noFallthroughCasesInSwitch": true
   },
   "include": ["vite.config.ts"]
 }

frontend/vite.config.ts

@@ -1,7 +1,6 @@
-import { defineConfig } from 'vite'
-import react from '@vitejs/plugin-react'
+import { defineConfig } from "vite";
+import tailwindcss from "@tailwindcss/vite";
 
-// https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
-})
+  plugins: [tailwindcss()],
+});