#include <Keypad.h>

// Pin declaration
const int ROWS = 4;
const int COLS = 4;

int doorPin = 23;
int buzzerPin = 32;
int checkingFlag = 0;
int DISENABLE_PIN=34;

int DISENABLEFLAG;
boolean DIGITAL_DISENABLE=false;
const char DIGITAL_DISENABLECODE[5]="0987";
const char restartcode[5]="0369";
char enteredPasscode[5]; 
int passcodeIndex = 0;
const char passcode[] = "1234";

char keys[ROWS][COLS] = {
    {'1', '2', '3', 'A'},
    {'4', '5', '6', 'B'},
    {'7', '8', '9', 'C'},
    {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {15, 2, 0, 4}; // Connect to the row pinouts of the keypad
byte colPins[COLS] = {16, 17, 5, 18}; // Connect to the cols input of the keypad

// Object declaration of keypad
Keypad myKeypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// State of door and alarm
boolean doorOpen = false;
boolean alarmOn = false;

// Times
unsigned long doorOpenTime = 0;
const unsigned long maxTime = 20000;

void setup() {
    pinMode(doorPin, INPUT);
    pinMode(buzzerPin, OUTPUT);
    pinMode(DISENABLE_PIN,INPUT);
    Serial.begin(9600);
    /*pinMode(buzzerPin, HIGH);
    delay(500);
    pinMode(buzzerPin,LOW);
    delay(500);
   //door  colse time
   */
   // delay(10000);
    Serial.println("ALARAM STARTED");
}

void loop() {
    //Serial.println("ALARAM STARTED");
    DISENABLEFLAG=digitalRead(DISENABLE_PIN);
    doorOpen = digitalRead(doorPin) == HIGH;
    checkingFlag = 0;
    if(DISENABLEFLAG==HIGH){
      Serial.println("System Hard Disenable...");
      delay(5000);
    }

    if (doorOpen&&DISENABLEFLAG==LOW && DIGITAL_DISENABLE==false) {
        checkingFlag = 1;
        Serial.println("Enter The Key");
        doorOpenTime = millis(); // Start the clock
    }

    // Looping
    while (checkingFlag == 1 && millis() - doorOpenTime < maxTime) {
        char key = myKeypad.getKey();

        if (key != NO_KEY) {
            if (key == '#') {
                // Check if the entered passcode matches
                if (strcmp(enteredPasscode, passcode) == 0) {
                    Serial.println("Access Granted");
                    digitalWrite(buzzerPin,HIGH);
                    delay(1000);
                    digitalWrite(buzzerPin, LOW);
                    // Turn off the buzzer
                    digitalWrite(buzzerPin, LOW);
                    checkingFlag = 0; // Exit loop
                }
                else if(strcmp(enteredPasscode,restartcode)==0){
                 Serial.println("System Get Reset....");
                 ESP.restart();
                }
                //digital enable
                else if(strcmp(enteredPasscode,DIGITAL_DISENABLECODE)==0){
                  Serial.println("System In DisEnble State....");
                  DIGITAL_DISENABLE=true;
                } else {
                    Serial.println("Access Denied");
                }
                //Restart funtion
                
                // Reset entered passcode
                passcodeIndex = 0;
                memset(enteredPasscode, 0, sizeof(enteredPasscode));
            } else if (key == '*') {
                // Clear entered passcode
                passcodeIndex = 0;
                memset(enteredPasscode, 0, sizeof(enteredPasscode));
            } else {
                // Add key to entered passcode
                if (passcodeIndex < 4) { // Avoid buffer overflow
                    enteredPasscode[passcodeIndex++] = key;
                    Serial.print("Entered Passcode: ");
                    Serial.println(enteredPasscode);
                }
            }
        }
    }
     while (DIGITAL_DISENABLE==true) {
        char key = myKeypad.getKey();

        if (key != NO_KEY) {
            if (key == '#') {
                // Check if the entered passcode matches
                if(strcmp(enteredPasscode,DIGITAL_DISENABLECODE)==0){
                  DIGITAL_DISENABLE=false;
                  Serial.println("Alaram Enabled");
                  ESP.restart();
                }
                
                // Reset entered passcode
                passcodeIndex = 0;
                memset(enteredPasscode, 0, sizeof(enteredPasscode));
            } else if (key == '*') {
                // Clear entered passcode
                passcodeIndex = 0;
                memset(enteredPasscode, 0, sizeof(enteredPasscode));
            } else {
                // Add key to entered passcode
                if (passcodeIndex < 4) { // Avoid buffer overflow
                    enteredPasscode[passcodeIndex++] = key;
                   // Serial.println("ENTER KEY FOR ENABLE THE ALARM SYSTEM..");
                    Serial.print("Entered Key: ");
                    Serial.println(enteredPasscode);
                }
            }
        }
 }

    // Alarm activated if door open for too long
    if (millis() - doorOpenTime >= maxTime && checkingFlag==1&&DIGITAL_DISENABLE==false) {
      while(true){
        alarmOn = true;
        Serial.println("Alarm activated.");
        digitalWrite(buzzerPin, HIGH);
    }
    }
}