#include <ESP32Servo.h>


const int buttonPin = 25;
const int pirPin = 26;
const int servoPin = 27;

Servo gateServo;


bool isGateOpen = false;
unsigned long gateOpenedAt = 0;
const unsigned long gateOpenDuration = 10000; // 10 seconds (10,000 ms)


volatile bool buttonFlag = false;
volatile bool pirFlag = false;

// --- Debounce Variables ---
volatile unsigned long lastButtonPress = 0;
const unsigned long debounceDelay = 250; // 250 milliseconds debounce



void IRAM_ATTR buttonISR() {
  unsigned long currentTime = millis();
  // Software debounce check
  if ((currentTime - lastButtonPress) > debounceDelay) {
    buttonFlag = true;
    lastButtonPress = currentTime;
  }
}

void IRAM_ATTR pirISR() {
  pirFlag = true;
}

// --- Main Setup ---
void setup() {
  Serial.begin(115200);


  pinMode(buttonPin, INPUT_PULLUP); 
  pinMode(pirPin, INPUT_PULLDOWN);  

  // Configure Servo
  gateServo.attach(servoPin);
  gateServo.write(0); // 0 degrees = CLOSED position

 
  attachInterrupt(digitalPinToInterrupt(buttonPin), buttonISR, FALLING);
  // Rising edge because PIR goes LOW -> HIGH on motion
  attachInterrupt(digitalPinToInterrupt(pirPin), pirISR, RISING);

  Serial.println("System Ready. Gate is CLOSED.");
}

// --- Main Loop ---
void loop() {
  // 1. Check for Triggers
  if (buttonFlag || pirFlag) {
    
    if (!isGateOpen) {
      // Gate was closed, so open it
      gateServo.write(90); 
      isGateOpen = true;
      Serial.print("Triggered by: ");
      Serial.println(buttonFlag ? "Manual Button" : "PIR Motion Sensor");
      Serial.println("Gate OPENED.");
    } else {
      // Gate is already open (Repeated Trigger Handling)
      Serial.print("Trigger detected while open. Extending time by 10s. Trigger: ");
      Serial.println(buttonFlag ? "Manual Button" : "PIR Motion Sensor");
    }

    gateOpenedAt = millis(); 

  
    buttonFlag = false;
    pirFlag = false;
  }

  if (isGateOpen && (millis() - gateOpenedAt >= gateOpenDuration)) {
    gateServo.write(0); // Move back to CLOSED position
    isGateOpen = false;
    Serial.println("Time elapsed. Gate CLOSED.");
  }
}