/*
  Task B — Coding: Use a single button with press-type detection (display the event on the 
OLED): 
  Name: Raja M Ayyaz
  Roll No: CS-1278
  course embeded iot

*/


#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Pins
const int buttonPin = 32;
const int ledPin = 2;
const int buzzerPin = 25;

// Button handling
bool lastButtonState = HIGH;
unsigned long pressStartTime = 0;
bool isPressing = false;

// Press classification
const unsigned long longPressTime = 1500; // 1.5 sec

bool ledState = false;

void showEvent(const char* text) {
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 10);
  display.println(text);
  display.display();
}

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  showEvent("Ready!");
}

void loop() {
  bool currentState = digitalRead(buttonPin);

  if(currentState == LOW && lastButtonState == HIGH) {
    pressStartTime = millis();
    isPressing = true;
  }

  if(currentState == HIGH && lastButtonState == LOW) {
    unsigned long pressDuration = millis() - pressStartTime;
    isPressing = false;

    if(pressDuration < longPressTime) {
      ledState = !ledState;
      digitalWrite(ledPin, ledState);
      showEvent("Short Press");
    }
  }

  if(isPressing && (millis() - pressStartTime >= longPressTime)) {
    showEvent("Long Press");
    tone(buzzerPin, 1000, 200);
    isPressing = false;
  }

  lastButtonState = currentState;
}