#include <LiquidCrystal_I2C.h>
#define leftBtnPin 13
#define rightBtnPin 8
#define centerBtnPin 12
#define hourPin 11
#define minPin 10
#define secPin 9
LiquidCrystal_I2C lcd(0x27, 16, 2);

int hours = 0;
int minutes = 0;
int seconds = 0;
int counterLeftButton = 0;

int hourSteps = -2;
int minuteSteps = -2;
int secondSteps = -2;

bool leftLastState = HIGH;
bool centerLastState = HIGH;
bool rightLastState = HIGH;

void setup() {
    pinMode(leftBtnPin, INPUT_PULLUP);
    pinMode(centerBtnPin, INPUT_PULLUP);
    pinMode(rightBtnPin, INPUT_PULLUP);
    pinMode(hourPin, OUTPUT);
    pinMode(minPin, OUTPUT);
    pinMode(secPin, OUTPUT);
    // Serial.begin(115200);
    lcd.init();         
    lcd.backlight();
    setLcdTime(hours, minutes, seconds);
    setMotorTime(hours, minutes, seconds);
}

void loop() {
  // эти три блока - чтобы кнопочки работали дискретно
  
  bool leftBtn = digitalRead(leftBtnPin);
  bool centerBtn = digitalRead(centerBtnPin);
  bool rightBtn = digitalRead(rightBtnPin);

  bool leftPressed = leftBtn == LOW && leftLastState == HIGH;
  bool centerPressed = centerBtn == LOW && centerLastState == HIGH;
  bool rightPressed = rightBtn == LOW && rightLastState == HIGH;

  leftLastState = leftBtn;
  centerLastState = centerBtn;
  rightLastState = rightBtn;

  if (leftPressed) {
      counterLeftButton += 1;
      if (counterLeftButton == 1){
        lcd.clear();
        setLcdTime(hours, minutes, seconds);
        lcd.setCursor(6, 1);
        lcd.print("^");
        lcd.setCursor(7, 1);
        lcd.print("^");
      }
      else if(counterLeftButton == 2){
        lcd.clear();
        setLcdTime(hours, minutes, seconds);
        lcd.setCursor(9, 1);
        lcd.print("^");
        lcd.setCursor(10, 1);
        lcd.print("^");
      }
      else if(counterLeftButton == 3){
        lcd.clear();
        setLcdTime(hours, minutes, seconds);
        lcd.setCursor(12, 1);
        lcd.print("^");
        lcd.setCursor(13, 1);
        lcd.print("^");
      }
      else{
        lcd.clear();
        lcd.setCursor(6, 0);
        lcd.print("Done");
        delay(1000);
        setLcdTime(hours, minutes, seconds);
        setMotorTime(hours, minutes, seconds);
        counterLeftButton = 0;
      }
    }
    if (rightPressed) {
      if(counterLeftButton == 1){
        if(hours > 0){
          hours -= 1;
        } else if(hours == 0){
          hours = 23;
        }
      }
      else if(counterLeftButton == 2){
        if(minutes > 0){
          minutes -= 1;
        } else if(minutes == 0){
          minutes = 59;
        }
      }
      else if(counterLeftButton == 3){
        if(seconds > 0){
          seconds -= 1;
        } else if (seconds == 0){
          seconds = 59;
        }
      }
      setLcdTime(hours, minutes, seconds);
    }
    if (centerPressed) {
      if(counterLeftButton == 1){
        if(hours < 23){
          hours += 1;
        }else if(hours == 23){
          hours = 0;
        }
      }
      else if(counterLeftButton == 2){
        if(minutes < 59){
          minutes += 1;
        }else if(minutes == 59){
          minutes = 0;
        }
      }
      else if(counterLeftButton == 3){
        if(seconds < 59){
          seconds += 1;
        }else if(seconds == 59){
          seconds = 0;
        }
      }
      setLcdTime(hours, minutes, seconds);
    }
  delay(100);
}

void addHourStep() {
  hourSteps = hourSteps + 1;
  if (hourSteps > 199) {
    hourSteps = 0;
  }
  digitalWrite(hourPin,HIGH);
  digitalWrite(hourPin,LOW);
}

void addMinuteStep() {
  minuteSteps = minuteSteps + 1;
  if (minuteSteps > 199) {
    minuteSteps = 0;
  }
  digitalWrite(minPin,HIGH);
  digitalWrite(minPin,LOW);
}

void addSecondStep() {
  secondSteps = secondSteps + 1;
  if (secondSteps > 199) {
    secondSteps = 0;
  }
  digitalWrite(secPin,HIGH);
  digitalWrite(secPin,LOW);
}

void setMotorTime(int hArg, int mArg, int sArg) {

  int targetHourSteps = (hArg % 12 + (float)mArg / 60 + (float)sArg / 3600) * 50 / 3;
  int targetMinuteSteps = (mArg + (float)sArg / 60) * 10 / 3;
  int targetSecondSteps = sArg * 10 / 3;

  bool hourReady = false;
  bool minReady = false;
  bool secReady = false;

  while (!(hourReady && minReady && secReady)) {

    if (hourSteps != targetHourSteps) {
      addHourStep();
    } else {
      hourReady = true;
    }

    if (minuteSteps != targetMinuteSteps) {
      addMinuteStep();
    } else {
      minReady = true;
    }

    if (secondSteps != targetSecondSteps) {
      addSecondStep();
    } else {
      secReady = true;
    }
    delay(10);
  }

}

void setLcdTime(int hours, int minutes, int seconds){
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.setCursor(6, 0);
  if (hours < 10){
    lcd.print(0);
    lcd.setCursor(7, 0);
  }
  lcd.print(hours);
  lcd.print(":");
  lcd.setCursor(9, 0);
  if (minutes < 10){
    lcd.print(0);
    lcd.setCursor(10, 0);
  }
  lcd.print(minutes);
  lcd.print(":");
  lcd.setCursor(12, 0);
  if (seconds < 10){
    lcd.print(0);
    lcd.setCursor(13, 0);
  }
  lcd.print(seconds);
}