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#ifndef _DS7505_HPP
#define _DS7505_HPP

#include <cstdint>

namespace mbed
{
  class I2C;
}

/// Interface to the DS7505 temperature sensor.
class DS7505
{
public:
  enum Result
  {
    Success,
    Hardware_Failure,
    Out_of_Range
  };
  
  /// @param I2C_interface A configured I2C interface to use for communication.
  /// @param I2C_address Device bus address in mbed format.
  DS7505(mbed::I2C & I2C_interface, std::uint8_t I2C_address);
  
  /// Set the resolution for temperature conversions.
  /// @param resolution Number of decimal bit from 1 to 4.
  Result set_resolution(std::uint8_t resolution);
  
  /// Reads the current temperature with an exponent of 10^-2.
  /// @note Compatible with Bluetooth characteristic: org.bluetooth.characteristic.temperature.
  Result read_current_temp(std::int16_t & temperature) const;
  
  /// Reads the current temperature as a floating point value.
  Result read_current_temp(double & temperature) const;
  
  /// Reads the current temperature as an integer value.
  Result read_current_temp(std::int8_t & temperature) const;
  
private:
  /// Bit resolution of temperature conversions.
  enum Config_Resolution
  {
    Config_9b_Res = 0x00,
    Config_10b_Res = 0x20,
    Config_11b_Res = 0x40,
    Config_12b_Res = 0x60
  };
  
  /// DS7505 Register addresses.
  enum Register
  {
    Temperature_Reg = 0x00,
    Configuration_Reg = 0x01,
    Thyst_Reg = 0x02,
    Tos_Reg = 0x03
  };
  
  /// Represents a DS7505 configuration.
  struct Config
  {
    Config_Resolution resolution;
    bool enable_shutdown_mode;
    
    Config(Config_Resolution resolution, bool enable_shutdown_mode)
      : resolution(resolution), enable_shutdown_mode(enable_shutdown_mode) { }
  };
  
  /// @note Mark as mutable to allow manipulation by read_temp_sensor().
  mutable Config m_current_config;
  
  mbed::I2C & m_I2C_interface;
  std::uint8_t m_I2C_address;
  
  /// Returns the maximum time needed in ms for a sample at the specified resolution.
  static std::uint8_t get_measure_delay_ms(Config_Resolution resolution);
  
  /// Reads the current temperature via I2C.
  /// Assumes that the I2C register pointer is already set to the temperature register.
  /// @param sensor_data Output for raw data from DS7505 with upper and lower bytes combined.
  /// @returns True on success.
  bool read_temp_sensor_data(std::uint16_t & sensor_data) const;
  
  /// Reads the current temperature with support for shutdown mode.
  /// @param sensor_data Output for raw data from DS7505 with upper and lower bytes combined.
  /// @returns Success or Hardware_Failure.
  Result read_temp_sensor(std::uint16_t & sensor_data) const;
  
  /// Sets the I2C register pointer for the next operation.
  /// @param pointer_reg Desired register to set.
  /// @returns True on success.
  /// @note Allow marking const since not public.
  bool set_register_pointer(Register pointer_reg) const;
  
  /// Writes to a device register via I2C.
  /// @param write_reg Register to write to.
  /// @param write_val Value to write to the register.
  /// @returns True on success.
  /// @note Allow marking const since not public
  bool write_register(Register write_reg, std::uint8_t write_val) const;
  
  /// Writes the current configuration via I2C.
  /// @returns True on success.
  /// @note Allow marking const since not public
  bool write_current_config() const;
};

#endif