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/// @file
/// @brief ROM Commands for enumerating and selecting 1-Wire devices.

#ifndef MaximInterface_RomCommands
#define MaximInterface_RomCommands

#include <stdint.h>
#include <MaximInterface/Utilities/Export.h>
#include <MaximInterface/Utilities/RomId.hpp>
#include "OneWireMaster.hpp"

namespace MaximInterface {

/// State used by Search ROM command.
struct SearchRomState {
  RomId::array romId;
  int_least8_t lastDiscrepancy;
  int_least8_t lastFamilyDiscrepancy;
  bool lastDevice;

  SearchRomState()
      : romId(), lastDiscrepancy(0), lastFamilyDiscrepancy(0),
        lastDevice(false) {}
    
  explicit SearchRomState(RomId::const_span romId)
      : lastDiscrepancy(64), lastFamilyDiscrepancy(0), lastDevice(false) {
    copy(romId, make_span(this->romId));
  }
      
  explicit SearchRomState(RomId::element familyCode)
      : romId(), lastDiscrepancy(64), lastFamilyDiscrepancy(0),
        lastDevice(false) {
    setFamilyCode(romId, familyCode);
  }
};

/// @brief
/// Set the search state to skip the current device family on the next
/// Search ROM command.
MaximInterface_EXPORT void skipCurrentFamily(SearchRomState & searchState);

/// Verify that the device with the specified ROM ID is present.
MaximInterface_EXPORT error_code verifyRom(OneWireMaster & master,
                                           RomId::const_span romId);

/// @brief Use Read ROM command to read ROM ID from device on bus.
/// @note
/// Only use this command with a single-drop bus.
/// Data collisions will occur if there is more than one device on the bus.
/// @param master 1-Wire master for operation.
/// @param[out] romId ROM ID read from device.
MaximInterface_EXPORT error_code readRom(OneWireMaster & master,
                                         RomId::span romId);

/// @brief Issue Skip ROM command on bus.
/// @note
/// Only use this command with a single-drop bus.
/// Data collisions will occur if there is more than one device on the bus.
MaximInterface_EXPORT error_code skipRom(OneWireMaster & master);

/// @brief Use the Match ROM command to select the device by its known ID.
/// @note
/// This command causes all devices supporting Overdrive mode to switch to
/// Overdrive timing.
/// @param master 1-Wire master for operation.
/// @param[in] romId ROM ID of device to select.
MaximInterface_EXPORT error_code matchRom(OneWireMaster & master,
                                          RomId::const_span romId);

/// @brief Issue Overdrive Skip ROM command on bus.
/// @note
/// This command causes all devices supporting Overdrive mode to switch to
/// Overdrive timing.
/// @note
/// Only use this command with a single-drop bus.
/// Data collisions will occur if there is more than one device on the bus.
MaximInterface_EXPORT error_code overdriveSkipRom(OneWireMaster & master);

/// @brief
/// Use the Overdrive Match ROM command to select the device by its known ID.
/// @param master 1-Wire master for operation.
/// @param[in] romId ROM ID of device to select.
MaximInterface_EXPORT error_code overdriveMatchRom(OneWireMaster & master,
                                                   RomId::const_span romId);

/// @brief Perform a Resume ROM command on bus.
/// @details
/// Resumes communication with the last device selected through a Match ROM or
/// Search ROM operation.
MaximInterface_EXPORT error_code resumeRom(OneWireMaster & master);

/// @brief Find device on the 1-Wire bus.
/// @details
/// This command uses the Search ROM command to enumerate all 1-Wire devices in
/// sequence. Begin with a new search state and continue using the same search
/// state until the last device flag is set which indicates that all devices
/// have been discovered.
MaximInterface_EXPORT error_code searchRom(OneWireMaster & master,
                                           SearchRomState & searchState);

} // namespace MaximInterface

#endif