#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#define REST      0
#define RED 13
#define GREEN 12
#define PURPLE 11

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

//speed
int tempo = 85;

int counter_found=0;


int buzzer = 2;
int divider = 0, noteDuration = 0;
#define MOBILE_NUMBER_LENGTH 10
#define MAX_ENTRIES_PER_MOBILE_NUMBER 2
#define MAX_ENTRIES 100 

char mobileNumbers[10][11] = 
{
  "6396979579",
  "9536977024", 
  "9389724663",
  "9997023797", 
  "8219688819", 
  "8171483009", 
  "7890123456",
  "8901234567",
  "7302166870",
  "0123456789"
};

unsigned long entryTimes[MAX_ENTRIES][2]; 
int entryCount = 0; 

const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {10, 9, 8, 7};
byte colPins[COLS] = {6, 5, 4, 3};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);



int attemp=0;
int key;
int found=0;
int mil_gya=0;

void setup() 
{
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(PURPLE, OUTPUT);
  Serial.begin(9600);

  display_at_start();
  

  // LCD.setCursor(0, 1);
  // LCD.println("JEEVAN PRAKASH");

}


void display_at_start()
{
  LCD.init();
  LCD.backlight();
  LCD.setCursor(4, 0);
  LCD.print("WELCOME...");
  delay(2000);
  LCD.clear();
  LCD.setCursor(3, 0);
  LCD.print("LOADING...");
  delay(1000);
  

}

void loop() 
{
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("ENTER ID: ");

digitalWrite(13, HIGH);
digitalWrite(11, HIGH);
int i=0;
char inputNumber[11] = "";
LCD.setCursor(0, 1);
while(i<10)
{
  char key = keypad.getKey();
  if (key != NO_KEY && key != '*' && key != '#') 
  {
    Serial.print(key);
    LCD.print(key);
    inputNumber[i] = key;
    i++;
  }

  if(key=='*')
  {
    Serial.println("\nCode break !");
    tone(2, 510,180);
    delay(300);
    tone(2, 130,180);
    delay(300);
    tone(2, 510,180);
    break;
  }

  if(key=='#')
  {
    Serial.println("\nCode break !");
    tone(2, 510,180);
    delay(300);
    tone(2, 130,180);
    delay(300);
    tone(2, 510,180);
    break;
  }
}

for (int i = 0; i < 10; i++) 
  {
    if (strcmp(mobileNumbers[i], inputNumber) == 0) 
    {
      Serial.println("\nId found!");
      LCD.clear();
      LCD.print("ID found!");
      tone(2,500,300);
      found = 1;

      int count = 0;
      unsigned long now = millis();
      for (int s = 0; s < entryCount; s++) 
      {
        if ((strcmp(mobileNumbers[i], (char*)entryTimes[s][0]) == 0))
        {
          if (now - entryTimes[s][1]<=86400000) 
          {
            // Serial.println(counter_found);
            counter_found++;
            count++;
          }
        }
      }

      if (count >= MAX_ENTRIES_PER_MOBILE_NUMBER) 
      {
        Serial.println("REPEATED ID !");
        
        LCD.clear();
        LCD.print("LIMIT EXCEED");
        tone(2,200,200);
        delay(500);
        tone(2,200,200);
        digitalWrite(12, LOW);
        digitalWrite(13, HIGH);
        counter_found=0;
        delay(2000);
        break;
      } 
      
      else 
      {
        if(counter_found<2)
        {
          entryTimes[entryCount][0] = (unsigned long)mobileNumbers[i];
          entryTimes[entryCount][1] = now;
          entryCount = (entryCount + 1) % MAX_ENTRIES;
          Serial.println("ID ACCEPTED");
          LCD.clear();
          LCD.print("PRESS TO BUY");
          mil_gya=1;
          digitalWrite(12, HIGH);
          digitalWrite(13, LOW);
          digitalWrite(11, LOW);
          delay(10000);    // 10 sec delay to choose...
          digitalWrite(12, LOW);
          LCD.clear();
          break;
        }

        
      }
    }

    
    if (i == 9)
    {
      Serial.println("\nID NOT FOUND");
      LCD.clear();
      LCD.setCursor(0, 0);
      LCD.print("ID NOT FOUND !");

      //security....
      if(attemp==5)
      {
        police();
      }
      attemp++;
      tone(2,200,200);
      delay(500);
      tone(2,200,200);
      digitalWrite(13, HIGH);
      digitalWrite(12, LOW);
      delay(2000);
      loop();
    }
  }
    
  delay(500);

}

void police()
{
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("MACHINE LOCKED !");
  int j=0;
  while(j!=10)
  {
    Serial.println("\nALARM ACTIVATED [10 SECOND] !");
    tone(2,200,1000);
    delay(500);
    tone(2,500,500);
    delay(500);
    j++;
  }
  attemp=0;
  Serial.println("\nMACHINE LOCKED [20 SECOND] !");
  delay(20000);
  loop();
}