// trigger pas load pertama kali
public function daftar()
    {
        $available = $this->event_model->getAvailable();
        $options = array(
            'word' => rand(1, 999999),
            'img_path' => './assets/img/captcha/',
            'img_url' => base_url('assets').'/img/captcha/',
            'img_width' => '110',
            'img_height' => '37.5',
            'expiration' => 7200,
            'word_length' => 8,
            'colors'        => array(
                'background'     => array(255, 255, 255),
                'border'         => array(255, 255, 255),
                'text'           => array(0, 0, 0),
                'grid'           => array(255, 75, 100)
            )
        );
        $data = array(
            'available' => $available,
            'captcha' => create_captcha($options),
        );

        $this->load->view('tpa_daftar', $data);
    }

//trigger pas submit form
public function register()
    {
        // delete_files('./assets/img/captcha/');
        $this->load->helper('security');
        $this->load->helper('file');
        $this->session->set_userdata('captcha_answer',$this->input->post('code'));
        $this->form_validation->set_rules('captcha', 'Captcha', 'required|integer|callback_check_captcha');

        $jadwal = $this->input->post('jadwal', TRUE);
        $nama = $this->input->post('name', TRUE);
        $email = $this->input->post('email', TRUE);
        $id = $this->user_id();

        if($this->form_validation->run() == TRUE){
            delete_files('./assets/img/captcha/');
            $config['file_name'] = $id.".jpg";
            $config['upload_path'] = './uploads/datadiri/';
            $config['allowed_types'] = 'jpg|jpeg|png';
            $config['max_size'] = '5120';
            $config['overwrite'] = TRUE;

            $this->load->library('upload', $config);
            if($this->upload->do_upload('identitas')){
                $data = array(
                    'nama' => $nama,
                    'jenis_id' => $this->input->post('id_type', TRUE),
                    'nomor_id' => $this->input->post('id_number', TRUE),
                    'email' => $email,
                    'no_hp' => $this->input->post('phone', TRUE),
                    'keperluan' => $this->input->post('keperluan', TRUE),
                    'tanggal_lahir' => $this->input->post('birthdate', TRUE),
                    'password' => crypt($this->input->post('password', TRUE),'$2x$15$NdGFmYLzo2hYI5WTAoJtkO$'),
                    'no_registrasi' => $id,
                    'foto_identitas' => "./uploads/datadiri/".$id.".jpg",
                    'foto_bukti' => ""
                );

                $this->event_model->register($data);

                $kode = $this->event_model->get_exam_code();
                $acak = array_rand($kode, 1);

                $waktu_jadwal = $this->event_model->getWaktuJadwal($jadwal);

                $data = array(
                    'no_registrasi_test' => $id,
                    'jadwal_id_test' => $jadwal,
                    'kode_soal_test' => $kode[$acak]
                );

                $this->event_model->register_exam($data);

                $data = array(
                    'no_registrasi_test' => $id,
                    'tanggal' => $waktu_jadwal['tanggal'],
                    'waktu' => $waktu_jadwal['waktu'],
                    'harga' => $waktu_jadwal['harga'],
                    'nama' => $nama,
                    'email' => $email
                );

                $this->message($id, $data);

                $this->session->set_flashdata('nama', $data['nama']);
                $this->session->set_flashdata('email', $data['email']);


                $title = "Pendaftaran TPKA ITS atas nama ".$this->session->flashdata('nama')." berhasil!";
                $message = "Terima kasih atas pendaftaran anda. Kami telah mengirimkan informasi langkah berikutnya untuk melakukan transaksi pembayaran secara online pada e-mail <b>".$this->session->flashdata('email')."</b>. Anda juga dapat mendatangi TPKA ITS langsung untuk melakukan transaksi pembayaran secara langsung.";
                $data = array(
                    'title' => $title,
                    'message' => $message
                );
                $this->load->view('tpa_notifikasi', $data);
            }
        }
        //redirect(base_url('register_success'));
    }