#ifndef FPGA_H_
#define FPGA_H_

#include "General.h"
#include "Utility.h"
#include "Version.h"
#include <math.h>        /* ceil */
#include <openssl/sha.h> /* generate hash */

#define MTAC_SX1301 0x0
#define MTAC_FPGA 0x1

#define MTAC_FPGA_ADDRESS 0x1
#define READ_ACCESS 0x00
#define WRITE_ACCESS 0x80
#define SPI_SPEED 8000000

#define MTAC_PAGE_REG 0
#define MTAC_SOFT_RESET 1
#define MTAC_VERSION 2

#define MTCDT_DEFAULT_FILE "/usr/lib/mts-flash-binaries/mtcdt-fpga-v31.hex"
#define MTCAP_DEFAULT_FILE "/usr/lib/mts-flash-binaries/mtcap-fpga-v31.hex"

struct mtac_reg_s {
    int8_t page;  /*!< page containing the register (-1 for all pages) */
    uint8_t addr; /*!< base address of the register (7 bit) */
    uint8_t offs; /*!< position of the register LSB (between 0 to 7) */
    bool sign;    /*!< 1 indicates the register is signed (2 complem.) */
    uint8_t leng; /*!< number of bits in the register */
    bool rdon;    /*!< 1 indicates a read-only register */
    int32_t dflt; /*!< register default value */
};

class Mtac15Fpga {
  private:
    HardwareType hardwareType = HARDWARE_INVALID;
    void *spi_target_ptr = NULL;
    const char pin_high = '1';
    const char pin_low = '0';
    std::string port;
    std::string spiPath;
    std::string input_file;
    uint8_t fpgaVersion;
    rapidjson::Document deviceInfo;
    rapidjson::Document::AllocatorType &alloc = deviceInfo.GetAllocator();

    void sha256_hash_string(unsigned char hash[SHA256_DIGEST_LENGTH],
                            char outputBuffer[65]);
    void sha256(char *string, char outputBuffer[65]);
    int sha256_file(const char *path);
    int spiOpen();
    int spiRead(uint8_t spi_mux_target, uint8_t address, uint8_t *data);
    int spiWrite(uint8_t spi_mux_target, uint8_t address, uint8_t data);
    int spiClose();
    int busContention();
    int cresetWrite(char num);
    int releaseDevice();
    int writeEnable();
    int chipEraseVerify();
    int chipErase();
    int mtacErase();
    int pageProgram(uint8_t adr_lower, uint8_t adr_higher, uint32_t data[256]);
    int mtacProgram(const char input_file[]);

  public:
    Mtac15Fpga(std::string inputFile, std::string forcedPath);
    Mtac15Fpga(std::string path);
    int getFpgaVersion();
    int FpgaVersion();
    void printFpgaVersion();
    int upgradeFpga();
};

#endif /* FPGA_H_ */