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

int LED_RED = 6;
int LED_BLUE = 3;
int LED_YELLOW = 9;
int LED_GREEN = 5;

int BUTTON = 7;

int currentMode = 0;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 200;

void setup() {
  lcd.init();
  lcd.backlight();
  
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_BLUE, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(BUTTON, INPUT);
  
  displayMode(currentMode);
}

void loop() {
  int buttonState = digitalRead(BUTTON);

  if (buttonState == HIGH && (millis() - lastDebounceTime) > debounceDelay) {
    currentMode++;
    if (currentMode > 2) {
      currentMode = 0;
    }
    lastDebounceTime = millis();

    displayMode(currentMode);
  }

  if (currentMode == 0) {
    randomBlink();
  } else if (currentMode == 1) {
    sequentialBlink();
  } else if (currentMode == 2) {
    fadeBlink();
  }
}

void displayMode(int mode) {
  lcd.clear();
  lcd.setCursor(0, 0);

  if (mode == 0) {
    lcd.print("Random Blink");
  } else if (mode == 1) {
    lcd.print("Sequential Blink");
  } else if (mode == 2) {
    lcd.print("Fade Blink");
  }
}

void randomBlink() {
  int randomLED = random(LED_RED, LED_GREEN + 1);
  digitalWrite(randomLED, HIGH);
  delay(200);
  digitalWrite(randomLED, LOW);
  delay(200);
}

void sequentialBlink() {
  for (int i = LED_RED; i <= LED_GREEN; i++) {
    digitalWrite(i, HIGH);
    delay(200);
    digitalWrite(i, LOW);
  }
}

void fadeBlink() {
  for (int i = LED_RED; i <= LED_GREEN; i++) {
    for (int brightness = 0; brightness <= 255; brightness += 5) {
      analogWrite(i, brightness);
      delay(30);
    }
    for (int brightness = 255; brightness >= 0; brightness -= 5) {
      analogWrite(i, brightness);
      delay(30);
    }
  }
}