#include <LiquidCrystal_I2C.h>
#include <Encoder.h>
Encoder enc(2, 3);
LiquidCrystal_I2C lcd(0x27, 16, 2);

int menuind = 0;
int levelind = 0;

int clicks = 0;
int press = 0;
bool pressed;
int value = 0;
int oldpos = -999;
int val = 0;

String menu[] = {"Play","Options","About Program","Exit"};
const int menuleght = sizeof(menu) / sizeof(menu[0]);

String options[] = {"Difficulty","Graphic","Show all clicks","Exit"};
const int optionsleght = sizeof(options) / sizeof(options[0]);

String aboutprog[] = {"FIO","Group","City","Exit"};
const int aboutprogleght = sizeof(aboutprog) / sizeof(aboutprog[0]);

unsigned long lpt = 0;
const unsigned long dd = 200;

void setup(){
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  pinMode(4, INPUT_PULLUP);

  display();
}

void display(){
  lcd.clear();

  if(levelind == 0){
    lcd.setCursor(0,0);
    lcd.print(">");
    lcd.print(menu[menuind]);

    if(menuind + 1 < menuleght){
      lcd.setCursor(0,1);
      lcd.print(" ");
      lcd.print(menu[menuind + 1]);
    }
  }
  else if (levelind == 1){
    lcd.setCursor(0,0);
    lcd.print(">");
    lcd.print(options[menuind]);

    if(menuind + 1 < optionsleght){
      lcd.setCursor(0,1);
      lcd.print(" ");
      lcd.print(options[menuind + 1]);
    }
  }
  else if (levelind == 2){
    lcd.setCursor(0,0);
    lcd.print(">");
    lcd.print(aboutprog[menuind]);

    if(menuind + 1 < aboutprogleght){
      lcd.setCursor(0,1);
      lcd.print(" ");
      lcd.print(aboutprog[menuind + 1]);
    }
  }
}

void loop(){
  if(millis() - lpt > dd){
    int pos = enc.read()/4;
    if (oldpos != pos){
      value = pos - oldpos;
      oldpos = pos;
      if(value == 1){
        menuind++;
      }else if (value == -1){
        menuind--;
      }
      if (menuind == 4){
        menuind = 0;
      }
      if(menuind == -1){
        menuind = 3;
      }
      Serial.println(menuind);
      display();
    }
    if (digitalRead(4) == 0){
      if (!pressed){
        pressed = true;
        press = millis();}
    }else if (pressed){
      unsigned long Duration = millis() - press;
      Serial.println(Duration);
      if (Duration > 500){
        Serial.println("long");
        levelind = levelind - 1;
        if (levelind == -1){
          lcd.clear();
          lcd.setCursor(0,0);
          lcd.print("Bye Bye");
          delay(2000);
          lcd.clear();
          lcd.noBacklight();
        }
        display();

      }else {
        Serial.print("short");
        clicks++;
        selectopt();
      }
      pressed = false;
     }
  }
}

void selectopt(){
  if(levelind == 0){
    if(menuind == 1){
      levelind = 1;
      menuind == 0;
      display();
    }
    else if(menuind == 0){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Wokwi sim");
      lcd.setCursor(0,1);
      lcd.print("MircoSys Menu");
      delay(2000);
      display();
    }
    else if(menuind == 3){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Bye Bye");
      delay(2000);
      lcd.clear();
      lcd.noBacklight();
    }
    else if (menuind == 2){
      levelind = 2;
      menuind = 0;
      display();
    }
  }
  else if ( levelind == 2){
    if(menuind == 0){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Rudakov Andrew");
      delay(1000);
      display();
    }
    if(menuind == 1){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("73-KD9-3KCK");
      delay(1000);
      display();
    }
    if(menuind == 2){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Krasnodar");
      delay(1000);
      display();
    }
    if(menuind == 3){
      levelind = 0;
      menuind = 0;
      display();
    }
  }
  else if (levelind == 1){
    if(menuind == 0){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Diff Setting");
      delay(1000);
      display();
    }

    if(menuind == 1){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Grap Settings");
      delay(1000);
      display();
    }
    if(menuind == 2){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("All clicks: ");
      lcd.print (clicks);
      delay(2000);
      display();
    }
    if(menuind == 3){
      levelind = 0;
      menuind = 0;
      display();
    }
  }
}