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

const byte length_vertical = 16;
const byte length_horizont = 2;

char symbols[16][2];

LiquidCrystal_I2C lcd(0x27, length_horizont, length_vertical);

const int up = 512;
const int down = 512;
const int left = 512;
const int right = 512;

const byte pinX = A0;
const byte pinY = A1;
const byte pinB = 2;

int cursor_pos_x = 0;
int cursor_pos_y = 0;

bool buttonDown = false;

unsigned long time = 0;
unsigned long time_joystick = 0;
const short drebezg = 200;

void button()
{
  if(cursor_pos_y == 0)
  {
    cursor_pos_y++;
  }
  else
  {
    cursor_pos_y--;
  }
  lcd.setCursor(cursor_pos_x, cursor_pos_y);

  buttonDown = true;
}

//vert
void switching(bool up = true)
{
  if (up)
  {
    if (symbols[cursor_pos_x][cursor_pos_y] < 90)
    {
      if(symbols[cursor_pos_x][cursor_pos_y] >= 65)
      {
        symbols[cursor_pos_x][cursor_pos_y]++;
      }
      else
      {
        symbols[cursor_pos_x][cursor_pos_y] = 65;
      }
    }
  }
  else if(symbols[cursor_pos_x][cursor_pos_y] < 65)
  {
    symbols[cursor_pos_x][cursor_pos_y] = 65;
  }
  else if (symbols[cursor_pos_x][cursor_pos_y] > 65)
  {
    symbols[cursor_pos_x][cursor_pos_y]--;
  }

  lcd.print(symbols[cursor_pos_x][cursor_pos_y]);
  lcd.setCursor(cursor_pos_x, cursor_pos_y);

}

//hor
void cursor(bool right = true)
{
  if (right)
  {
    if (cursor_pos_x < 15)
    {
      cursor_pos_x++;
    }
  }
  else
  {
    if (cursor_pos_x > 0)
    {
      cursor_pos_x--;
    }
  }

  lcd.setCursor(cursor_pos_x, cursor_pos_y);
}

void setup() {
  Wire.begin(); // Инициализация I2C
  lcd.init();   // Инициализация дисплея
  lcd.backlight(); // Включаем подсветку
  lcd.setCursor(0, 0);
  lcd.blink();

  pinMode(pinB, INPUT_PULLUP);
  pinMode(pinX, INPUT);
  pinMode(pinY, INPUT);

  Serial.begin(9600);
}

void loop() {

  if (digitalRead(pinB) == false && buttonDown == false && time + drebezg < millis())
  {
    button();
    time = millis();
  }
  else if (analogRead(pinX) > left && time_joystick + drebezg < millis())
  {
    cursor(false);
    time_joystick = millis();
  }

  else if (analogRead(pinX) < right && time_joystick + drebezg < millis())
  {
    cursor();
    time_joystick = millis();
  }

  else if (analogRead(pinY) > up && time_joystick + drebezg < millis())
  {
    switching();
    time_joystick = millis();
  }

  else if (analogRead(pinY) < down && time_joystick + drebezg < millis())
  {
    switching(false);
    time_joystick = millis();
  }

  if (digitalRead(pinB) == true && buttonDown == true && time + drebezg < millis())
  {
    buttonDown = false;
    time = millis();
  }

}