#include <LiquidCrystal.h>
#include <Keypad.h>
#include <Servo.h>
#include <string.h>
// #include <Time.h>
#include <TimeLib.h>
#include <string.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal LCD(8, 9, 10, 11, 12, 13); // RS,EN,D4,D5,D6,D7

Servo servo;

const int buzzerPin = 14; // pin-14 = pin-A0
const int servoPin = 15;  // pin-15 = pin A-1

const byte ROWS = 4, COLS = 4;

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

// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = {16, 17, 2, 3};

// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
byte colPins[COLS] = {4, 5, 6, 7};

//  Create the Keypad
Keypad kpd = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

char password[16], string[16];
int flag_h_setpassword = 1, flag_inputpassword = 1, flag_inputstring = 0, flag_opendoor = 1, flag_state = 0, flag_remoteopen = 0, flag_lockdown = 0;
int count = 0, trial_count = 0, pos = 0, state = 0, flog = 0;
// flag_setpassword = flag for setting the password,
// flag_stringinput = flag for taking input the string,
// int hour = 0, minute = 0;
void setup()
{
    for (int k = 8; k < 14; k++)
    {
        pinMode(k, OUTPUT); // pins 8-14 are enabled as output
    }

    LCD.begin(16, 2); // initializing LCD

    // for the Peizo-buzzer
    // Serial.begin(8600) ;
    pinMode(buzzerPin, OUTPUT);

    // for Servo-Motor
    // pinMode(servoPin, OUTPUT) ;
    servo.attach(servoPin);

    // for Bluetooth-Module
    Serial.begin(9600);

    // Now, the Welcome message...
    LCD.setCursor(0, 0);
    LCD.print("   WELCOME !!");
    LCD.setCursor(0, 1);
    LCD.print("Set a Password :");

    InitializePassword(), InitializeString();
    CloseDoor();
}

void InitializePassword()
{
    for (int i = 0; i < 16; ++i)
        password[i] = 0;
}

void InitializeString()
{
    for (int i = 0; i < 16; ++i)
        string[i] = 1;
}

void H_EnterTime()
{
    CloseDoor();
    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.print("Enter Time (HHMM):");
    LCD.setCursor(0, 1);
    flag_inputstring = 1, count = 0;
}

void OpenDoor()
{
    if (flag_opendoor == 1)
        return;
    for (pos = 15; pos <= 100; ++pos)
    {
        servo.write(pos);
        delay(15);
    }
    flag_opendoor = 1;
}

void CloseDoor()
{
    if (flag_opendoor == 0)
        return;
    for (pos = 100; pos >= 15; --pos)
    {
        servo.write(pos);
        delay(15);
    }
    flag_opendoor = 0;
}

void loop()
{
    if (flog == 0)
    {
        char key = kpd.getKey();

        if (key != NO_KEY)
        {
            // If enter key is pressed
            if (key == '#')
            {
                if (count == 4)
                {

                    int current_hour = hour(), current_minute = minute();
                    
                    // int current_hour = 3, current_minute = 20;
                    //                int input_time = hour * 100 + minute;
                    int current_time = current_hour * 100 + current_minute;
                    char buffer[10];
                    sprintf(buffer, "%d", current_time);

                    // char x[5], y[5];
                    // x[0] = string[0];
                    // x[1] = string[1];
                    // y[0] = string[2];
                    // y[1] = string[3];
                    // String myString1(x);
                    // int myInt1 = myString1.toInt();
                    // String myString2(y);
                    // int myInt2 = myString2.toInt();
                    // int sum = myInt1 * 60 * 60 + myInt2 * 60;
                    // int sum1 = current_hour * 60 * 60 + current_minute * 60;
                    if (strcmp(buffer, string) >= 0)
                    {
                        if (strcmp(buffer, string) == 0)
                        {
                            LCD.clear();
                            LCD.print("***VERIFIED!!***");
                            Serial.println("UNLOCKED !!");

                            // Open the door
                            for (int i = 0; i < 3; ++i)
                            {
                                tone(buzzerPin, 500, 200);
                                delay(230);
                                tone(buzzerPin, 100, 200);
                                delay(300);
                                OpenDoor();
                            }
                            flog = 0;
                        }
                        else
                        {
                            flog = 1;
                            LCD.clear();
                            LCD.print("Wait");
                            Serial.println("Wait !!");
                        }
                    }
                    else
                    {
                        LCD.clear();
                        LCD.print("Wrong Time !");
                        Serial.println("Someone unsuccessfully attempted to open the lock !");
                        trial_count++;
                        tone(buzzerPin, 100, 1000);
                        delay(1000);
                        H_EnterTime();
                    }
                }
                else
                {
                    InitializeString(), H_EnterTime();
                }
            }
            // If a digit is pressed
            else if (isdigit(key) && flag_inputstring == 1)
            {
                string[count] = key;
                count++;
                LCD.print(key);
                delay(100);
            }
        }
    }
    else
    {
        LCD.clear();
        LCD.print("Wait");
        Serial.println("Wait !!");
    }
}