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<?php
class UserModel {
    private $db;

public function __construct() {
        $database = new Database();
        $this->db = $database->connect();
    }

public function login($usuario, $password) {
        // Usar Prepared Statements para seguridad (evita SQL Injection)
        $stmt = $this->db->prepare("SELECT * FROM usuarios WHERE USR = ? AND PAS = ?");
        $stmt->bind_param("ss", $usuario, $password);
        $stmt->execute();
        $result = $stmt->get_result();

if ($result->num_rows > 0) {
            return $result->fetch_assoc(); // Retorna los datos del usuario (GRADO, etc)
        } else {
            return false;
        }
    }
    
    public function getUserGrade($usuario) {
        $stmt = $this->db->prepare("SELECT GRADO FROM usuarios WHERE USR = ?");
        $stmt->bind_param("s", $usuario);
        $stmt->execute();
        $result = $stmt->get_result();
        $data = $result->fetch_assoc();
        return $data['GRADO'] ?? 0;
    }
}
?>