//Malaika 
//Regno: 1291
//Assignment1-TaskB
#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// Pin setup
#define LED_PIN     18   // LED connected to GPIO 18
#define BUTTON_PIN  33   // Button connected to GPIO 33
#define BUZZER_PIN  27   // Buzzer connected to GPIO 27

Adafruit_SSD1306 display(128, 64, &Wire, -1);

// Variables
bool ledState = false;           // LED is initially OFF
unsigned long pressStart = 0;    // Time when button was pressed
bool buttonWasPressed = false;   // Track if button was pressed
const int longPressTime = 1500;  // 1500 milliseconds = 1.5 seconds

// Function to show messages on OLED
void showText(String line1, String line2 = "") {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(10, 20);
  display.println(line1);
  if (line2 != "") {
    display.setCursor(10, 35);
    display.println(line2);
  }
  display.display();
}

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Button connected to GND
  pinMode(BUZZER_PIN, OUTPUT);

  // Start OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    while (true); // stop if OLED not found
  }

  showText("System Ready", "Press Button");
}

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

  // When button is pressed (LOW because of INPUT_PULLUP)
  if (buttonState == LOW && !buttonWasPressed) {
    buttonWasPressed = true;
    pressStart = millis(); // Record the time when pressed
  }

  // When button is released
  if (buttonState == HIGH && buttonWasPressed) {
    buttonWasPressed = false;
    unsigned long pressDuration = millis() - pressStart;

    if (pressDuration < longPressTime) {
      // Short press → toggle LED
      ledState = !ledState;
      digitalWrite(LED_PIN, ledState);
      if (ledState)
        showText("Short Press", "LED is ON");
      else
        showText("Short Press", "LED is OFF");
    } else {
      // Long press → buzzer sound
      showText("Long Press", "Buzzer ON");
      tone(BUZZER_PIN, 1000, 1000); // 1kHz tone for 1s
    }

    delay(1000);
    showText("System Ready", "Press Button");
  }

  delay(10);
}