#include <LiquidCrystal_I2C.h>
#include <Wire.h>


LiquidCrystal_I2C lcd(0x27,16,2);

const int buttonUp=2;
const int buttonDown=3;
const int buttonSel=4;

int menuIndex=0;
const int menuLength=4;

int currentIndex=0;
int menuLevel=0;//0-glav 1-podmenu
unsigned long lastPressTime=0;
const unsigned long debounceDelay=220;

String settingsMenu[]={
  "light",
  "contr",
  "exit",
};
const int settingsMenuLength=sizeof(settingsMenu)/sizeof(settingsMenu[0]);


String menuItems[]={
  "Temperatur",
  "Vada",
  "settings",
  "Golda",
};
const int menuItemsLength=sizeof(menuItems)/sizeof(menuItems[0]);

//bool upPressed=false;
//bool downPressed=false;
//bool buttonSelect=false;

void setup() {
  Serial.begin(115200);
 lcd.init();
  lcd.backlight();


 pinMode(buttonUp, INPUT_PULLUP);
 pinMode(buttonDown, INPUT_PULLUP);
 pinMode(buttonSel, INPUT_PULLUP);

 
displayMenu();

}

void loop() {
  if(millis()-lastPressTime>debounceDelay){
    if(digitalRead(buttonUp)==LOW){
      moveUp();
      lastPressTime=millis();
    }
    if(digitalRead(buttonDown)==LOW){
      moveDown();
      lastPressTime=millis();
    }
    if(digitalRead(buttonSel)==LOW){
      selectOption();
      lastPressTime=millis();
    }
  }
  
}
  void displayMenu(){
    if(menuIndex==0){
      lcd.setCursor(0,0);
       lcd.print("");
       lcd.print(""+ menuItems[menuIndex]);

       if(menuIndex+1<menuLength){
        lcd.setCursor(0,1);
       lcd.print("");
       lcd.print(""+ menuItems[menuIndex+1]);
       }
    }
    else if(menuLevel==1){
      lcd.setCursor(0,1);
       lcd.print(">");
       lcd.print(">"+ settingsMenu[menuIndex]);
       if(menuIndex+1<settingsMenuLength){
        lcd.setCursor(0,1);
       lcd.print(" ");
       lcd.print(settingsMenu[menuIndex+1]);
       }
    }
    /*
    lcd.setCursor(0,0);
    lcd.print(">"+ menuItems[menuIndex]);
    lcd.setCursor(0,1);
    int nextIndex=(menuIndex + 1) % menuLength;
    lcd.print(" " + menuItems[nextIndex]);
    Serial.print("Index = ");
    Serial.println(menuIndex);
    Serial.print("Next Index = ");
    Serial.println(nextIndex);
    */
  }

  void selectOption(){
    if(menuLevel==0){
      if(menuIndex==0){
        menuLevel=1;
        menuIndex=0;
        displayMenu();
      }else if(menuIndex==1){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("wokwi sim");
        lcd.clear();
        lcd.setCursor(0,1);
        lcd.print("micro menu");
        displayMenu();
      }else if(menuIndex==2){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("good bay");
        lcd.noBacklight();
      }
    }else if(menuLevel==1){
      if(menuIndex==0){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("set light");
        delay(1000);
        displayMenu();
      }else if(menuLevel==1){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("set contr");
        delay(1000);
        displayMenu();
      }else if(menuIndex==2){
        menuLevel=0;
        menuIndex=0;
        displayMenu();
      }
    }
  }

  void moveUp(){
        menuIndex--;
        if(menuIndex<0)menuIndex=menuLength-1;{
          menuIndex=3;
        }
        displayMenu();
  }
  void moveDown(){
        menuIndex++;
      if(menuIndex>=menuLength){
        menuIndex=0;
      }
      displayMenu();
    }