#include "Thermometer.h"
#include "Config.h"

using namespace nsThermometer;

const float INVALID_TEMPERATURE = -300.0;

const uint8_t CONFIG_ALPHA = 0;


Thermometer::Thermometer() {
	
} 


void Thermometer::setAlpha(float alpha) {
  m_alpha = alpha;
  Config::setFloat(m_eepromAddr + CONFIG_ALPHA, m_alpha);
}


void Thermometer::begin(bool initializeConfig, int eepromAddr) {
	m_eepromAddr = eepromAddr;
	
	if (initializeConfig) {
	  // set default values
    Config::setFloat(m_eepromAddr + CONFIG_ALPHA, 1.0);
	}
	
	m_lastSmoothedTemperature = INVALID_TEMPERATURE;
	m_alpha = Config::getFloat(m_eepromAddr + CONFIG_ALPHA);
}


void Thermometer::exec(float r) {
	m_temperatureRaw = (r / PT1000_R0 - 1) / PT1000_Coeff;

	if (m_lastSmoothedTemperature == INVALID_TEMPERATURE) {
		m_temperature = m_temperatureRaw;
	} else {
		m_temperature = m_alpha * m_temperatureRaw + (1.0 - m_alpha) * m_lastSmoothedTemperature;
	}
	m_lastSmoothedTemperature = m_temperature;
}