ADD: added database connection for players data handling and started login funtion with database

backend/internal/database/database.go

@@ -17,6 +17,29 @@ type database struct {
 	db       *sql.DB // Pointer to sql.DB
 }
 
+func (d *database) SetupTables() error {
+	InitTables(d.db)
+	log.Println("Database setup completed successfully.")
+	return nil
+}
+
+func (d *database) GetDB() *sql.DB {
+	if d.db == nil {
+		log.Println("Database connection is not established. Call Connect() first.")
+		return nil
+	}
+	return d.db
+}
+
+// New creates a new database instance with the provided configuration.
+// It initializes the database connection parameters but does not connect to the database.
+// This function should be called before calling Connect() to establish the connection.
+// It returns a pointer to the database instance.
+// Example usage:
+// db := database.New("localhost", 5432, "user", "password", "dbname")
+// It is intended to be used in the main application or setup phase.
+// This function is not intended to be called during normal application operation.
+// It is not intended to be called during normal application operation.
 func New(host string, port int, user, password, dbname string) *database {
 	return &database{
 		host:     host,
@@ -28,7 +51,7 @@ func New(host string, port int, user, password, dbname string) *database {
 	}
 }
 
-func (d *database) Connect() error {
+func (d *database) Connect() (db *sql.DB) {
 	fmt.Println("Connecting to the database...")
 	psqlInfo := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
 		d.host, d.port, d.user, d.password, d.dbname)
@@ -49,5 +72,5 @@ func (d *database) Connect() error {
 
 	log.Println("Connected to the database successfully")
 	d.db = db
-	return nil
+	return db
 }