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

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

int pinSensor = 23;
int buzzerPin = 27;
int buttonPin = 17;
int ledAlarmPin = 14;
int ledStandbyPin = 18;
int ledNotStandbyPin = 19;

bool statusIR = false;
bool status = true;
unsigned long prevTime = 0;
int scrollPosition = 128;
unsigned long prevScrollTime = 0;

const char* deviceStatus = "Active"; 
const char* objectStatus = "Not Detected";

void setup() {
  Serial.begin(115200);
  Serial.println("ESP32 PIR Sensor Test");

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // initialize with the I2C addr 0x3C (for 128x64)
  display.display();
  delay(3000);
  display.clearDisplay();

  pinMode(pinSensor, INPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledAlarmPin, OUTPUT);
  pinMode(ledStandbyPin, OUTPUT);
  pinMode(ledNotStandbyPin, OUTPUT);
} 

void loop() {
  // logika untuk memperbarui status alat
  if (digitalRead(buttonPin) == LOW) {
    tone(buzzerPin, 282, 150); // Plays 262Hz tone for 0.250 seconds
    delay(50);
    if (status) {
      status = false;
      deviceStatus = "Not Active"; 
    } else {
      status = true;
      deviceStatus = "Active"; 
    }
  }

  // logika untuk menyalakan lampu status alat
  if (status) {
    digitalWrite(ledStandbyPin, LOW);
    digitalWrite(ledNotStandbyPin, HIGH);
  } else {
    digitalWrite(ledStandbyPin, HIGH);
    digitalWrite(ledNotStandbyPin, LOW);
  }

  // logika untuk deteksi objek bernyawa
  if (digitalRead(pinSensor) && status == true) {
    unsigned long currentTime = millis();
    unsigned long timeDifference = (currentTime - prevTime);
    objectStatus = "Detected!";

    if (timeDifference > 200) {
      tone(buzzerPin, 521, 150); // Plays 262Hz tone for 0.250 seconds
      digitalWrite(ledAlarmPin, HIGH);
      prevTime = currentTime;
    }
    digitalWrite(ledAlarmPin, LOW);

  } else {
    objectStatus = "Not Detected!";
  }

  // untuk setting display ke OLED
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  display.setCursor(0, 0);
  display.print("SMART SECURITY SISTEM");

  display.setCursor(0, 24);
  display.print("Status : ");
  display.setCursor(0, 34);
  display.print("Object : ");

  display.setCursor(scrollPosition, 56);
  display.print("Sistem keamanan berbasis sensor gerak dan notifikasi buzzer serta LED");

  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(50, 24);
  display.print(deviceStatus);

  display.setCursor(50, 34);
  display.print(objectStatus);
  
  display.display();  
  display.clearDisplay();

  // Scrolling effect
  scrollPosition--;
  if (scrollPosition < -430) { 
    scrollPosition = 128; // Reset scroll position ke awal jika sudah selesai scrolling
  }

  delay(1); // speed scrolling effect

}