#include <Servo.h>
#include <LiquidCrystal_I2C.h>
#define CLK 15
#define DT 16
#define SW 17

Servo servo;
LiquidCrystal_I2C lcd(0x27,20,4); // Wiring: SDA pin is connected to A4 and SCL pin to A5.

int angle = 90;
int SSpeed = 30;
int Timer_Vale = 0;
int Alin = A0;
bool Prev_State;
bool Servo_Stop;
bool Start_Flag = false;

int counter_1 = 0;
int counter = 0;

int Buzzer = 13;

int Dig_1;
int Dig_2;
int Dig_3;

int Dig_11;
int Dig_21;
int Dig_31;

int Dig_12;
int Dig_22;
int Dig_32;

int currentStateCLK;
int lastStateCLK;
int btnState;
bool Last_Start_Timer = false;
bool Start_Timer;
bool FWD_Flag;
bool REV_Flag = true;
unsigned long startMillis;  //some global variables available anywhere in the program
unsigned long currentMillis;
bool lastButtonPress = false;
const unsigned long period = 1000;
String currentDir ="";

void setup() {
  // put your setup code here, to run once:

  lcd.init();
  lcd.setCursor(0, 0);
  lcd.backlight();
  lcd.print("Timer:");
  lcd.setCursor(0,1);
  lcd.print("Speed:");

  Serial.begin(9600);

  pinMode(CLK,INPUT);
  pinMode(DT,INPUT);
  pinMode(SW, INPUT);
  digitalWrite(SW, HIGH);
  pinMode(Buzzer, OUTPUT);

  servo.attach(5);
  servo.write(angle);
  delay(2000);
  lastStateCLK = digitalRead(CLK);
  startMillis = millis();

}

void loop() 
{
  // put your main code here, to run repeatedly:

      currentMillis = millis();  
      
    if ((currentMillis - startMillis) >= period)  
    {
      
      if (Start_Timer == true)
      {  
        counter_1 ++;
        Serial.println(counter_1);
        Dig_12 = counter_1/100;;
        Dig_22 = ((counter_1 - (Dig_12*100))/10);
        Dig_32 = (counter_1 - (Dig_12*100)-(Dig_22*10));

        if (counter_1 >= 60)
        {
          Timer_Vale --;
          counter_1 = 0;
          if (Timer_Vale <=0)
          {
          Timer_Vale = 0;
          Start_Timer = false;
          digitalWrite(Buzzer, HIGH);
          delay(2000);
          digitalWrite(Buzzer, LOW); 
          }
        }
      }
      startMillis = currentMillis;
      
    }

    SSpeed = analogRead(Alin);
    SSpeed = map(SSpeed, 0,1024, 30, 10); 

		currentStateCLK = digitalRead(CLK);

	// If last and current state of CLK are different, then pulse occurred
	// React to only 1 state change to avoid double count
	if (currentStateCLK != lastStateCLK  && currentStateCLK == 1){

		// If the DT state is different than the CLK state then
		// the encoder is rotating CCW so decrement
		if (digitalRead(DT) != currentStateCLK) {
			Timer_Vale --;
			
		} else {
			// Encoder is rotating CW so increment
			Timer_Vale ++;
			
		}

	}

	// Remember last CLK state
	lastStateCLK = currentStateCLK;

    Dig_1 = Timer_Vale/100;;
    Dig_2 = ((Timer_Vale - (Dig_1*100))/10);
    Dig_3 = (Timer_Vale - (Dig_1*100)-(Dig_2*10));

    Dig_11 = SSpeed/100;;
    Dig_21 = ((SSpeed - (Dig_11*100))/10);
    Dig_31 = (SSpeed - (Dig_11*100)-(Dig_21*10));



    lcd.setCursor(7,0);
    lcd.print(Dig_1);
    lcd.print(Dig_2);
    lcd.print(Dig_3);
    lcd.print(":");

    lcd.setCursor(11,0);
    lcd.print(Dig_22);
    lcd.print(Dig_32);

    lcd.setCursor(13,1);
    lcd.print(Dig_11);
    lcd.print(Dig_21);
    lcd.print(Dig_31);


    btnState = digitalRead(SW);

  if (btnState != lastButtonPress)
  {
    if (btnState== LOW && Start_Timer != true && Timer_Vale >0)
    {
      Start_Timer = true;
      Serial.println(" Start Flage = True");
    }
    else
    {
    if (btnState== LOW && Start_Timer == true )
    {
      Start_Timer = false; 
      Serial.println(" Start Flage = False");
    }   
    delay(100); 
    }
      
      lastButtonPress = btnState;
  }  

  if (angle <= 5 )
  {
    FWD_Flag = true;
    REV_Flag = false;
  }

    if (angle >= 179 )
  {
    REV_Flag = true;
    FWD_Flag = false;
  }

  if (Start_Timer == true && FWD_Flag) 
  {
      angle ++;
      servo.write(angle);               
      delay(SSpeed); 
  } 

  if (Start_Timer == true && REV_Flag) 
  {
      angle --;
      servo.write(angle);               
      delay(SSpeed); 
  }

}