#ifndef MISSION_OBC_CCSDSIPCOREBRIDGE_H_
#define MISSION_OBC_CCSDSIPCOREBRIDGE_H_

#include <fsfw/tmtcservices/TmTcBridge.h>
#include <fsfw_hal/common/gpio/gpioDefinitions.h>
#include <fsfw_hal/linux/gpio/LinuxLibgpioIF.h>

#include <cstring>

#include "OBSWConfig.h"

/**
 * @brief   This class handles the interfacing to the telemetry (PTME) and telecommand (PDEC) IP
 *          cores responsible for the CCSDS encoding and decoding. The IP cores are implemented
 *          on the programmable logic and are accessible through the linux UIO driver.
 */
class CCSDSIPCoreBridge : public TmTcBridge {
 public:
  /**
   * @brief   Constructor
   *
   * @param objectId
   * @param tcDestination
   * @param tmStoreId
   * @param tcStoreId
   * @param uioPtme   Name of the uio device file which provides access to the PTME IP Core.
   * @param papbBusyId    The ID of the GPIO which is connected to the PAPBBusy_N signal of the
   *                      PTME IP Core. A low logic level indicates the PTME is not ready to
   *                      receive more data.
   * @param papbEmptyId   The ID of the GPIO which is connected to the PAPBEmpty signal of the
   *                      PTME IP Core. The signal is high when there are no packets in the
   *                      external buffer memory (BRAM).
   */
  CCSDSIPCoreBridge(object_id_t objectId, object_id_t tcDestination, object_id_t tmStoreId,
                    object_id_t tcStoreId, LinuxLibgpioIF* gpioComIF, std::string uioPtme,
                    gpioId_t papbBusyId, gpioId_t papbEmptyId);
  virtual ~CCSDSIPCoreBridge();

  ReturnValue_t initialize() override;

 protected:
  /**
   * Overwriting this function to provide the capability of testing the PTME IP Core
   * implementation.
   */
  virtual ReturnValue_t handleTm() override;

  virtual ReturnValue_t sendTm(const uint8_t* data, size_t dataLen) override;

 private:
  static const uint8_t INTERFACE_ID = CLASS_ID::CCSDS_IP_CORE_BRIDGE;

  static const ReturnValue_t PAPB_BUSY = MAKE_RETURN_CODE(0xA0);

  /** Size of mapped address space. 4k (minimal size of pl device) */
  //    static const int MAP_SIZE = 0xFA0;
  static const int MAP_SIZE = 0x1000;

  /**
   * Configuration bits:
   * bit[1:0]: Size of data (1,2,3 or 4 bytes). 1 Byte <=> b00
   * bit[2]: Set this bit to 1 to abort a transfered packet
   * bit[3]: Signals to PTME the start of a new telemetry packet
   */
  static const uint32_t PTME_CONFIG_START = 0x8;

  /**
   * Writing this word to the ptme base address signals to the PTME that a complete tm packet has
   * been transferred.
   */
  static const uint32_t PTME_CONFIG_END = 0x0;

  /**
   * Writing to this offset within the PTME memory space will insert data for encoding to the
   * PTME IP core.
   * The address offset is 0x400 (= 4 * 256)
   */
  static const int PTME_DATA_REG_OFFSET = 256;

  LinuxLibgpioIF* gpioComIF = nullptr;

  /** The uio device file related to the PTME IP Core */
  std::string uioPtme;

  /** Pulled to low when PTME not ready to receive data */
  gpioId_t papbBusyId = gpio::NO_GPIO;

  /** High when externally buffer memory of PTME is empty */
  gpioId_t papbEmptyId = gpio::NO_GPIO;

  /** The file descriptor of the UIO driver */
  int fd;

  uint32_t* ptmeBaseAddress = nullptr;

  /**
   * @brief   This function sends the config byte to the PTME IP Core to initiate a packet
   *          transfer.
   */
  void startPacketTransfer();

  /**
   * @brief   This function sends the config byte to the PTME IP Core to signal the end of a
   *          packet transfer.
   */
  void endPacketTransfer();

  /**
   * @brief   This function reads the papb busy signal indicating whether the PAPB interface is
   *          ready to receive more data or not. PAPB is ready when PAPB_Busy_N == '1'.
   *
   * @return  RETURN_OK when ready to receive data else PAPB_BUSY.
   */
  ReturnValue_t pollPapbBusySignal();

  /**
   * @brief   This function can be used for debugging to check wheter there are packets in
   *          the packet buffer of the PTME or not.
   */
  void isPtmeBufferEmpty();

  /**
   * @brief   This function sends a complete telemetry transfer frame data field (1105 bytes)
   *          to the input of the PTME IP Core. Can be used to test the implementation.
   */
  ReturnValue_t sendTestFrame();
};

#endif /* MISSION_OBC_CCSDSIPCOREBRIDGE_H_ */