#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#define b1 7
#define b2 6
#define b3 5
LiquidCrystal_I2C lcd(0x27,16,2);

int menuindex=0;
int menulev=0;

int upCounter = 0;
int downCounter = 0;
int selectCounter = 0;
int allCounter = 0;


String menu[]{
"settings",
"information",
"noBlackLight",
};
const int menulength = sizeof(menu) / sizeof(menu[0]);
String menuInfo[]{
"FIO",
"Group",
"Buttons",
"back",
};
const int menuInfolength = sizeof(menuInfo) / sizeof(menuInfo[0]);


String menuSettings[]{
"Light.set",
"Contrast",
"back",
};
const int menuSettingslength = sizeof(menuSettings) / sizeof(menuSettings[0]);






unsigned long lastPressTime = 0;
unsigned long currentTime = 0;
const unsigned long debounceDelay = 300;

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
pinMode(7, INPUT_PULLUP);
pinMode(6, INPUT_PULLUP);
pinMode(5, INPUT_PULLUP);
dis();
}

void loop() {
  currentTime = millis();
    if (currentTime - lastPressTime >= debounceDelay) {
      if (digitalRead(b2) == LOW) {
        DW();
        lastPressTime = currentTime;
        downCounter++;
        allCounter++;
        Serial.println(menuindex);
      }
    }
    if (currentTime - lastPressTime >= debounceDelay) {
      if (digitalRead(b1) == LOW) {
        UP();
        lastPressTime = currentTime;
        upCounter++;
        allCounter++;
        Serial.println(menuindex);
      }
    }
    if (currentTime - lastPressTime >= debounceDelay) {
      if (digitalRead(b3) == LOW) {
        sel();
        lastPressTime = currentTime;
        allCounter++;
        selectCounter++;
        Serial.println(menuindex);
      }
    }
  

}

void dis(){
  lcd.clear();
  if(menulev==0){
    lcd.setCursor(0,0);
    lcd.print(">"+ menu[menuindex]);

    if(menuindex+1<menulength){
    lcd.setCursor(0,1);
    lcd.print(" " + menu[menuindex+1]);
  }
  }
  
  else if(menulev==1){
    lcd.setCursor(0,0);
      lcd.print(">"+ menuSettings[menuindex]);
       if(menuindex+1<menuSettingslength){
    lcd.setCursor(0,1);
      lcd.print(" "+ menuSettings[menuindex+1]);
  
  } 
  } 
   else if(menulev==2){
    lcd.setCursor(0,0);
      lcd.print(">"+ menuInfo[menuindex]);
       if(menuindex+1<menuInfolength){
    lcd.setCursor(0,1);
      lcd.print(" "+ menuInfo[menuindex+1]);
  } 
  }
}



void UP(){
  delay(200);
  menuindex--;
  if(menuindex<0){
    menuindex=3;
  }
  dis();
}
void DW(){
  delay(200);
  menuindex++;
  if(menuindex>=4){
    menuindex=0;
  }
  dis();
}
void sel(){
  if(menulev==0){
    if(menuindex==0){
      menulev=1;
      menuindex=0;
      dis();
    }
    if(menuindex==2){
      //menulev=1;
      //menuindex=0;
      lcd.noBacklight();
      
    } if(menuindex==1){
      menulev=2;
      menuindex=0;
      dis();
    }
  }
  
  //
  else if(menulev==1){
    if(menuindex==0){

      dis();
    }if(menuindex==2){
      menulev=0;
      menuindex=0;
      dis();
    }
    }
    else if(menulev==2){
    if(menuindex==0){
       lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Terehov");
      delay(500);
    dis();
    }if(menuindex==1){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("63-D9-KCK");
      delay(500);
    dis();
    }else if(menuindex==2){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("UP="+String(upCounter)+" DW="+String(downCounter));
      lcd.setCursor(0,1);
      lcd.print("all="+String(allCounter)+" sel="+String(selectCounter));
      
    }
    if(menuindex==3){
    lcd.clear();
    menulev=0;
    menuindex=0;
    dis();
    }
    }

    

  }//до сюда работает вход меню первого массива