#include "card_reader.hpp"
#include "factory.hpp"
#include <cstring>

namespace acs
{
    card_reader::card_reader()
    {
        rfid_ = factory::get()->get_devices()->rfid();
        rfid_->pcd_init();
    }

    uint32_t card_reader::find_card()
    {
        if (!rfid_->picc_is_new_card_present())
            return 0;
        if (!rfid_->picc_read_card_serial())
            return 0;
        last_uid_ = rfid_->uid;
        uint32_t retval;
        memcpy(&retval, last_uid_.uid_byte, 4);
        return retval;
    }

    std::string card_reader::get_student_number()
    {
        auto status = rfid_->pcd_authenticate(
            mfrc522::PICC_CMD_MF_AUTH_KEY_A, 1, &key_, &last_uid_);
        if (status != mfrc522::STATUS_OK)
            return {};
        byte buffer[18];
        byte len = 18;
        status = rfid_->mifare_read(1, buffer, &len);
        if (status != mfrc522::STATUS_OK || len != 18)
            return {};
        std::string retval;
        for (auto i = 0; i < 10; ++i)
        {
            if (buffer[i] < 0x30)
                break;
            retval += buffer[i];
        }
        rfid_->pcd_stop_crypto1();
        return retval;
    }

    mfrc522::mifare_key card_reader::key_ = { { 1, 2, 3, 4, 5, 6 } };
}