#include <LiquidCrystal.h>
#include <math.h>
#include "button.h"

#define GREEN_NTC A0
#define BLUE_NTC A1
#define YELLOW_NTC A2

timer_ period(100);

button_ button(2, INPUT_PULLUP);
enum { MAX, MID, MIN } tempType = MID;

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
byte celsius[8] =
{
  B00111,
  B00101,
  B00111,
  B00000,
  B00000,
  B00000,
  B00000
};

// Функция для перевода показаний датчика в градусы Цельсия
float getTemp(float RawADC)
{
  float celsius = 1 / (log(1 / (1023. / RawADC - 1)) / 3950 + 1.0 / 298.15) - 273.15;
  return celsius;
}

const byte qty = 10;
float greenPoll[qty] = {};
float bluePoll[qty] = {};
float yellowPoll[qty] = {};

float max = 0;
float mid = 0;
float min = 0;
byte count = 0;

inline void NTCWorker()
{
  if (count < qty)
  {
    greenPoll[count] = analogRead(GREEN_NTC);
    bluePoll[count] = analogRead(BLUE_NTC);
    yellowPoll[count] = analogRead(YELLOW_NTC);
    count++;
  }
  else
  {
    float averageGR = 0.0;
    float averageBL = 0.0;
    float averageYL = 0.0;

    for (byte i = 0; i < qty; ++i) {
      averageGR += greenPoll[i];
      averageBL += bluePoll[i];
      averageYL += yellowPoll[i];
    }

    averageGR /= qty;
    averageBL /= qty;
    averageYL /= qty;

    max = averageGR < averageBL ? (averageGR < averageYL ? averageGR : averageYL) : (averageBL < averageYL ? averageBL : averageYL);
    mid = averageGR > averageBL ? (averageGR > averageYL ? (averageYL > averageBL ? averageYL : averageBL) : averageGR) : (averageBL > averageYL ? (averageYL > averageGR ? averageYL : averageGR) : averageBL);
    min = averageGR > averageBL ? (averageGR > averageYL ? averageGR : averageYL) : (averageBL > averageYL ? averageBL : averageYL);

    max = getTemp(max);
    mid = getTemp(mid);
    min = getTemp(min);

    count = 0;
  }
}

inline void printTemp()
{
  lcd.clear();
  lcd.setCursor(0, 0);

  if (tempType == MAX)
  {
    lcd.print("Max temperature:");
    lcd.setCursor(0, 1);
    lcd.print(max);
    lcd.write(byte(0));
    lcd.print('C');
  }
  else if (tempType == MID)
  {
    lcd.print("Mid temperature:");
    lcd.setCursor(0, 1);
    lcd.print(mid);
    lcd.write(byte(0));
    lcd.print('C');
  }
  else
  {
    lcd.print("Min temperature:");
    lcd.setCursor(0, 1);
    lcd.print(min);
    lcd.write(byte(0));
    lcd.print('C');
  }
}

void setup(void)
{
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.createChar(0, celsius);

  period.restart();
}

void loop(void)
{
  if (button.onPressed()) 
  {
    if (tempType == MAX) tempType = MID;
    else if (tempType == MID) tempType = MIN;
    else tempType = MAX;
  }

  if (period.isExpired())
  {
    NTCWorker();
    period.restart();
  }

  printTemp();
}