#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

String* label[4] = {"name", "num", "class", "grade"};

String val[4] = {"HARIHARAN", "9876543109", "1", "A+"};

uint8_t arrow[8] = {
  0x00,
  0x04,
  0x06,
  0x1F,
  0x1F,
  0x06,
  0x04,
  0x00
};

int index = 0;

int vert;

const int buttonPinInc = 2;
const int buttonPinDec = 3;

int oldValueInc = LOW;
int oldValueDec = LOW;

int home(int cursor_col, int cursor_row, int label_row1, int label_row2)
{
  lcd.clear();
  lcd.setCursor(cursor_col, cursor_row);
  lcd.write(byte(0));
  lcd.setCursor(1, 0);
  lcd.print(label[label_row1]);
  lcd.setCursor(1, 1);
  lcd.print(label[label_row2]);
}

int setindex(int indx)
{
  if (index == 0 && vert == 512)
  {
    // vert = analogRead(A0);
    home(0, 0, index, index + 1);
    // Serial.println(vert);
  }
  if (index == 1)
  {
    home(0, 1, index - 1, index);
    // vert = analogRead(A0);
  }
  if (index == 2)
  {
    home(0, 0, index, index + 1);
    // vert = analogRead(A0);
  }
  if (index == 3)
  {
    home(0, 1, index - 1, index);
    // vert = analogRead(A0);
  }
}

void setup() {
  lcd.createChar(0, arrow);
  lcd.begin(16, 2);
  Serial.begin(115200);
  pinMode(2, INPUT_PULLUP);
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);

}
void loop() {

  vert = analogRead(A0);
  int horz = analogRead(A1);

  Serial.println(vert);

  if (index == 0 ) {
    setindex(index);
    do{
      vert = analogRead(A0);
    }while(vert == 512 && horz == 512);
  }

  if (vert == 1023 && index > 0)
  {
    index--;
    setindex(index);
    Serial.println(index);
  }

  if (vert == 0 &&  index < 4)
  {
    index++;
    setindex(index);
    Serial.println(index);
  }

  if (horz == 1023)
  {
    setindex(index);
  }

  if (horz == 0)
  {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(val[index]);
  }

  delay(100);

}