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

#define POTENTIOMETER_PIN A0    // Potentiometer pin
#define LED_PIN 5               // Alert LED
#define BUZZER_PIN 4            // Buzzer
#define CAMERA_LED_PIN 14       // Simulated Camera LED

LiquidCrystal_I2C lcd(0x27, 16, 2);

int closedThreshold = 1500;    // Closed position threshold
int openThreshold = 2500;      // Open/forced entry threshold
int hysteresis = 100;          // Buffer to prevent constant triggering
bool isTriggered = false;      // Flag to prevent repeated triggers

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(CAMERA_LED_PIN, OUTPUT);

  lcd.init();
  lcd.backlight();
  
  Serial.begin(115200);

  lcd.setCursor(0, 0);
  lcd.print("System Armed");
  lcd.setCursor(0, 1);
  lcd.print("Door Closed");
}

void loop() {
  int potValue = analogRead(POTENTIOMETER_PIN);
  delay(50);  // Small delay for debounce
  
  // Detect forced entry if potentiometer value exceeds openThreshold and system is not already triggered
  if (potValue > openThreshold && !isTriggered) {
    isTriggered = true;  // Set the flag to avoid repeated triggers
    digitalWrite(LED_PIN, HIGH);         // Alert LED ON
    digitalWrite(BUZZER_PIN, HIGH);      // Buzzer ON
    digitalWrite(CAMERA_LED_PIN, HIGH);  // Camera LED ON
    Serial.println("Forced Entry Detected!");

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Forced Entry!");
    lcd.setCursor(0, 1);
    lcd.print("Alert Sent...");
    
    delay(2000); // Keep the alert active
    digitalWrite(CAMERA_LED_PIN, LOW);   // Turn off camera LED
  }
  // Reset only when the potentiometer value is back to a stable "closed" position
  else if (potValue < closedThreshold && isTriggered) {
    isTriggered = false;  // Reset the flag
    digitalWrite(LED_PIN, LOW);     
    digitalWrite(BUZZER_PIN, LOW);  

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("System Armed");
    lcd.setCursor(0, 1);
    lcd.print("Door Closed");
  }
  
  delay(100); // Delay to reduce rapid fluctuations and allow stability
}