adds database mongoose event hooks

src/config/database.ts

@@ -1,10 +1,9 @@
-// aqui la conexión con MongoDB, usando mongoose o cualquier otro odm que vaya a usar
-// las conexión a bases de datos normalmente deberían ser Singleton para reutilizar la conexión
-// motivo: pues no saturar la base de datos ni saturarla con multiples conexiones
+import mongoose from 'mongoose';
+
 
 export class DatabaseConnection {
     private static instance: DatabaseConnection;
-    // private isConnected: boolean = false; // a implementar
+    private isConnected: boolean = false; // a implementar
   
     private constructor() {}
   
@@ -14,4 +13,43 @@ export class DatabaseConnection {
       }
       return DatabaseConnection.instance;
     }
+
+    public async connect(): Promise<void> {
+      if (this.isConnected) {
+        console.log("database is already connected")
+        return;
+      }
+  
+      try {
+        await mongoose.connect(config.mongodbUri, {
+          maxPoolSize: 10,
+          serverSelectionTimeoutMS: 5000,
+          socketTimeoutMS: 45000,
+          bufferCommands: false,
+        });
+  
+        this.isConnected = true;
+        console.log("database connected")
+  
+        mongoose.connection.on('error', (error) => {
+          console.log('MongoDB connection error', { error });
+          this.isConnected = false;
+        });
+  
+        mongoose.connection.on('disconnected', () => {
+          console.log('MongoDB connection disconnected', { error });
+          this.isConnected = false;
+        });
+  
+        mongoose.connection.on('reconnected', () => {
+          console.log('MongoDB connection reconnected');
+          this.isConnected = true;
+        });
+  
+      } catch (error) {
+        console.log('MongoDB Failed to connect', { error });
+        this.isConnected = false;
+        throw error;
+      }
+    }
 }