// Potentiometer is connected to GPIO 34 (Analog ADC1_CH6) 

#include <LiquidCrystal_I2C.h>
#include <EncButton.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

Button up(23);
Button down(13);
Button left(3);
Button righ(12);
Button ok(14);

int t_count = 0;
int count = 0;
unsigned long lastTime;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("SET TURNS = ");
  lcd.setCursor(12, 0);
  lcd.print(t_count);
  lcd.setCursor(0, 1);
  lcd.print("CRT TURNS = ");
  lcd.setCursor(12, 1);
  lcd.print(count);

  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  up.tick();
  down.tick();
  lcd.setCursor(0, 0);
  lcd.print("SET TURNS = ");
  lcd.setCursor(12, 0);
  lcd.print(t_count);
  lcd.setCursor(0, 1);
  lcd.print("CRT TURNS = ");
  lcd.setCursor(12, 1);
  lcd.print(count);

  
  count = constrain(count,0, 99999);
  if (t_count==1000) {lcd.print(t_count); lcd.print("   "); }
    if(up.press()) {
    lcd.setCursor(12,0); 
    t_count++;
    lcd.print(t_count);lcd.print("    ");
  }
  if(down.press() && t_count > 0) {
    lcd.setCursor(12,0);
    t_count--;
    lcd.print(t_count); lcd.print("    ");
  }

   if(up.holding()) { 
    upHolding(25);
  }
  if(t_count>0 && down.holding()) { 
    downHolding();
  }  

  delay(20);
}

int upHolding(byte maxMultiplier) {
    lcd.setCursor(12,0);
    //t_count+=2; 
    if (millis()-lastTime>3000) {
      lastTime = millis();
      t_count+=maxMultiplier;
    }
    else { t_count+=2; }
    
    lcd.print(t_count); 
    lcd.print("    ");
    return t_count;
  }
  
  int downHolding() {
    lcd.setCursor(12,0);
    t_count-=5; 
    if(t_count<=0) {t_count=0;} 
    lcd.print(t_count); 
    lcd.print("    ");
    return t_count;
  }