Add Database mongoDB

package.json

@@ -12,6 +12,7 @@
   "license": "ISC",
   "dependencies": {
     "express": "^4.19.2",
+    "mongoose": "^8.4.0",
     "socket.io": "^4.7.5"
   }
-}
+}

server.js

@@ -11,6 +11,54 @@ const PORT = process.env.PORT || 3000;
 const sampleUrl =
   "https://opentdb.com/api.php?amount=10&category=9&difficulty=easy&type=multiple";
 
+//DATABASE
+
+const mongoose = require("mongoose");
+const dbURI = "mongodb://localhost:27017/Quiz_Database";
+
+mongoose.connect(dbURI, { useNewUrlParser: true, useUnifiedTopology: true });
+
+const db = mongoose.connection;
+
+db.on(
+  "error",
+  console.error.bind(console, "Errore di connessione al database:")
+);
+db.once("open", () => {
+  console.log("Connesso al database MongoDB.");
+});
+
+const gameSchema = new mongoose.Schema({
+  id: { type: Number },
+  users: [{ type: mongoose.Schema.Types.ObjectId, ref: "User" }],
+  start: { type: Date, default: Date.now },
+  timestamp: { type: Date, default: Date.now },
+});
+
+const userSchema = new mongoose.Schema({
+  id: { type: Number },
+  username: { type: String, required: true },
+  role: { type: String, required: true },
+  created_at: { type: Date, default: Date.now },
+});
+
+const questionSchema = new mongoose.Schema({
+  id: { type: Number },
+  question: { type: String, required: true },
+  game_id: { type: mongoose.Schema.Types.ObjectId, ref: "Game" },
+  answers: [{ type: String }],
+  user_id: { type: mongoose.Schema.Types.ObjectId, ref: "User" },
+  correct: { type: Boolean, required: true },
+  question_id: { type: mongoose.Schema.Types.ObjectId, ref: "Question" },
+  answer: { type: Boolean, required: true },
+});
+
+const Game = mongoose.model("Game", gameSchema);
+const User = mongoose.model("User", userSchema);
+const Question = mongoose.model("Question", questionSchema);
+
+//FINE DATABASE
+
 var connectedUsers = 0;
 var readyUsers = [];
 var ranking = [];