#define DOOR_SWITCH PA12   // Door switch pin
#define PIR_PIN PB4        // PIR motion sensor pin
#define OUTPIN PA5         // Magnetic switch pin

unsigned int doorbuffertime = 1000;

typedef enum {
  UNACTIVATED = 0,
  DOOR_OPEN   = 1,
  INTRUDER    = 2,
  DOOR_CLOSED = 3
} Doorstate;

class DoorManagement {
  private:
    Doorstate MyDoorstate = UNACTIVATED;
    Doorstate prevState   = UNACTIVATED; // For printing only on change
    int doorswitch = DOOR_SWITCH;
    int magnetswitch = OUTPIN;
    int pirpin = PIR_PIN;

    void printState(const char* msg) {
      if (MyDoorstate != prevState) {
        Serial.println(msg);
        prevState = MyDoorstate;
      }
    }

  public:
    void checkdoorstatus() {
      switch (MyDoorstate) {

        case UNACTIVATED:
          if (digitalRead(doorswitch) == LOW) {
            printState("System not active yet...");
          } else {
            MyDoorstate = DOOR_CLOSED;
            printState("System activated. Door closed.");
          }
          break;

        case DOOR_CLOSED:
          if (digitalRead(doorswitch) == LOW) {
            printState("System disabled.");
            MyDoorstate = UNACTIVATED;
          } else {
            if (digitalRead(magnetswitch) == LOW) {
              MyDoorstate = DOOR_CLOSED;
              printState("You are safe. Door closed.");
            } else {
              MyDoorstate = INTRUDER;
              printState("⚠️ Intruder alert!");
            }
          }
          break;

        case INTRUDER:
          if (digitalRead(magnetswitch) == HIGH) {
            MyDoorstate = DOOR_OPEN;
            printState("🚨 High risk! Door is open. Check immediately!");
          } else {
            MyDoorstate = INTRUDER;
            printState("⚠️ Still at risk...");
          }
          break;

        case DOOR_OPEN:
          if (digitalRead(magnetswitch) == HIGH) {
            MyDoorstate = DOOR_OPEN;
            printState("🚨 Door open! High risk continues.");
          } else {
            MyDoorstate = DOOR_CLOSED;
            printState("✅ Door closed again. Situation safe.");
          }
          break;
      }

      // Extra: PIR integration (works in any state)
      if (digitalRead(pirpin) == HIGH) {
        Serial.println("👀 Motion detected by PIR sensor!");
      }
    }
};

DoorManagement MyDoor;

// Corrected timer function
void generatetimer(unsigned int time) {
  static unsigned long past_time = millis();
  if (millis() - past_time >= time) {
    Serial.println("Timer expired.");
    past_time = millis(); // reset timer
  }
}

void setup() {
  pinMode(DOOR_SWITCH, INPUT);
  pinMode(OUTPIN, INPUT);
  pinMode(PIR_PIN, INPUT);

  Serial.begin(115200);
  Serial.println("Hello, STM32! Security System Starting...");
}

void loop() {
  MyDoor.checkdoorstatus();
  generatetimer(doorbuffertime); // example timer usage
  delay(100); // small delay for stability
}