#include <ESP32Servo.h>

#define PIR_PIN 27
#define BUTTON_PIN 12
#define SERVO_PIN 14

#define OPEN_DURATION 10000
#define SERVO_CLOSED 0
#define SERVO_OPEN 90
#define DEBOUNCE_DELAY 50

Servo gateServo;

bool gateOpen = false;
unsigned long gateOpenTime = 0;

bool lastButtonReading = HIGH;
bool buttonStableState = HIGH;
unsigned long lastDebounceTime = 0;

bool lastPirState = LOW;

void setup() {
  Serial.begin(115200);
  pinMode(PIR_PIN, INPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);

  gateServo.attach(SERVO_PIN);
  gateServo.write(SERVO_CLOSED);

  Serial.println("System ready. Gate CLOSED.");
}

void openGate(const char* trigger) {
  gateServo.write(SERVO_OPEN);
  gateOpen = true;
  gateOpenTime = millis();
  Serial.print("Gate OPENED by: ");
  Serial.println(trigger);
}

void loop() {
  unsigned long currentTime = millis();

  bool pirState = digitalRead(PIR_PIN);
  if (pirState == HIGH && lastPirState == LOW) {
    if (!gateOpen) {
      openGate("PIR Motion Sensor");
    } else {
      gateOpenTime = currentTime;
      Serial.println("Motion detected - timer extended.");
    }
  }
  lastPirState = pirState;

  bool reading = digitalRead(BUTTON_PIN);
  if (reading != lastButtonReading) {
    lastDebounceTime = currentTime;
  }

  if ((currentTime - lastDebounceTime) > DEBOUNCE_DELAY) {
    if (reading != buttonStableState) {
      buttonStableState = reading;

      if (buttonStableState == LOW) {
        if (!gateOpen) {
          openGate("Manual Pushbutton");
        } else {
          gateOpenTime = currentTime;
          Serial.println("Button pressed - timer extended.");
        }
      }
    }
  }

  lastButtonReading = reading;

  if (gateOpen && (currentTime - gateOpenTime >= OPEN_DURATION)) {
    gateServo.write(SERVO_CLOSED);
    gateOpen = false;
    Serial.println("Gate CLOSED automatically.");
  }

  delay(10);
}