public function login() {
        $this->form_validation->set_rules($this->login_rules);
        if($this->form_validation->run()) {
            $username = $this->input->post('username');
            $password = $this->input->post('password');

            if(!$this->autentifikasi->login($username,$password)) {
                $this->session->set_flashdata('pesan', '<div class="error">Login gagal</div>');
                redirect(site_url('user/login'));
            } else {
                $this->session->set_flashdata('pesan', '<div class="sukses">Anda telah berhasil login, selamat berbelanja.</div>');
                redirect(site_url('user/login'));
            }
        }