#define DEBUG_MODE 0

// Define pin numbers
const int redLedPin = 4; // to show lock active or inactive state
const int blueLedPin = 7; // to show door open /close status
const int relayPin = 12;
const int doorStatePin = 11; // input feed back from magnetic lock 

// Define variables
bool doorClosed = true;
bool doorTriggered = false;
bool door_state=0;
unsigned long lastDoorNotCloseDetectedTime = 0;
unsigned long lastDoorOpenedTime = 0;
uint16_t power_state=0;

void setup()
{
  // Initialize serial communication
  Serial.begin(9600);

  // Set pin modes
  pinMode(redLedPin, OUTPUT);
  pinMode(blueLedPin, OUTPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(doorStatePin, INPUT);// external pull up added 

  digitalWrite(blueLedPin,HIGH);// default LED on
  digitalWrite(relayPin,HIGH);// active low Realay HIGH => off  and LOW => ON
  Serial.println("SYSTEM ONLINE");
}

void loop()
{
    power_state=analogRead(A6);
   door_state =digitalRead(doorStatePin);
    #if DEBUG_MODE == 1
    Serial.print("\r\n POWER:");Serial.print(power_state);
    Serial.print(" DOOR state");Serial.print(door_state);
    #endif
        // Check for serial input
        if (Serial.available() > 0)
        {
          delay(10);// wait till all bytes received
          String command = Serial.readStringUntil('\n');
          if (command == "OPEN")
          {
            openDoor();
          }
        }
      
        // Check if the switch is pressed
        if ((door_state == HIGH) || (power_state >500))// door open then high , door closed then loW when power cut of by other device PC817 gives high so 1023
        {
           if(doorClosed == true)// to do only once 
          {
           doorClosed = false;
           Serial.println("DOOR NOT CLOSED");
           lastDoorNotCloseDetectedTime = millis(); // Record the time when the switch was pressed
          }
          digitalWrite(blueLedPin, HIGH);
         
        }
        else
        {
          if(doorClosed == false)// to do only once 
          {
           doorClosed = true;
           Serial.println("DOOR CLOSED");
           delay(1000);// for deboucing feed back from lock
          }
          
          digitalWrite(blueLedPin, LOW);
        }
      
        // Check if the door is not closed within 3 seconds after turning off the relay
        if (!doorTriggered && !doorClosed && ((millis() - lastDoorNotCloseDetectedTime) > 3000)) // 
        {
          Serial.println("DOOR NOT CLOSED");
          lastDoorNotCloseDetectedTime = millis(); // reseting time
        }
        if(doorTriggered && ((millis()-lastDoorOpenedTime )>= 5000))//OPEN
        {
           digitalWrite(redLedPin, LOW); // Turn off the red LED
           digitalWrite(relayPin, HIGH); // Deactivate the relay
           doorTriggered=false;
           delay(1000);// for deboucing feed back from lock
        }
}

void openDoor()
{
  if((doorTriggered == false) && (doorClosed == true))
  {
      digitalWrite(redLedPin, HIGH); // Turn on the red LED
      digitalWrite(relayPin, LOW); // Activate the relay
      doorClosed = false;
      doorTriggered = true;
      Serial.println("DOOR OPENED");
      // Wait for 3 seconds
     // lastDoorOpenedTime= millis(); 
      delay(1000);// for deboucing feed back from lock 
  }
  else if((doorTriggered == false) && (doorClosed == false))
  {
      digitalWrite(redLedPin, HIGH); // Turn on the red LED
      digitalWrite(relayPin, LOW); // Activate the relay
      doorTriggered = true;
    Serial.println("DOOR NOT CLOSED");
       delay(1000);// for deboucing feed back from lock 
  }
  else
  {
  // Serial.println("DOOR OPENED"); 
   Serial.println("DOOR NOT CLOSED");
   lastDoorNotCloseDetectedTime = millis(); // reseting time
  }
  
  lastDoorOpenedTime= millis();// if another triggere comes with in time
 // delay(3000);
 // digitalWrite(redLedPin, LOW); // Turn off the red LED
 // digitalWrite(relayPin, HIGH); // Deactivate the relay
 // delay(1000);// for deboucing feed back from lock 
}