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

#define buttonNext 14   // Pin for the "Next" button
#define buttonPrev 15   // Pin for the "Previous" button

// Set the LCD address to 0x27 for a 16 chars and 2-line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

int led_num = 1; // Start with Mode 1

void setup() {
  lcd.init();
  lcd.backlight();  // Turn on the backlight
  lcd.setCursor(0, 0);
  lcd.print("Display test.");
  
  pinMode(buttonNext, INPUT);
  pinMode(buttonPrev, INPUT);
  
  digitalWrite(buttonNext, LOW);
  digitalWrite(buttonPrev, LOW);
  
  delay(1000); // Display "Hello, fayy!" for 1 second
}

void loop() {
  int valNext = digitalRead(buttonNext); // Read the "Next" button state
  int valPrev = digitalRead(buttonPrev); // Read the "Previous" button state

  if (valNext == HIGH) {
    led_num = led_num + 1;
    if (led_num > 3) led_num = 1; // Wrap around to Mode 1 if it exceeds 3
    delay(200); // Debounce delay
  }
  
  if (valPrev == HIGH) {
    led_num = led_num - 1;
    if (led_num < 1) led_num = 3; // Wrap around to Mode 3 if it goes below 1
    delay(200); // Debounce delay
  }

  lcd.clear();

  if (led_num == 1) {
    lcd.setCursor(0, 0);
    lcd.print("Mode 1");
  } else if (led_num == 2) {
    lcd.setCursor(0, 0);
    lcd.print("Mode 2");
  } else if (led_num == 3) {
    lcd.setCursor(0, 0);
    lcd.print("Mode 3");
  }

  delay(300); // Optional delay to slow down the loop
}