#include <Arduino.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
//#include <LiquidCrystal.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
//LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

char input[12];
int count = 0;

int a;
int p1 = 0, p2 = 0, p3 = 0, p4 = 0;
int c1 = 0, c2 = 0, c3 = 0, c4 = 0;

double total = 0;
int count_prod = 0;

void setup ()
{
  pinMode(A4, INPUT_PULLUP);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  /////////////////////////////////////
  lcd.init();
  lcd.init();
  lcd.backlight();
  /////////////////////////////////////
  lcd.clear();
  Wire.begin();
  Serial.begin(9600);
  lcd.setCursor(0, 0);
  lcd.print(" AUTOMATIC BILL");
  delay (2000);
  lcd.setCursor(0, 1);
  lcd.print(" SHOPPING CART ");
  delay (2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("WELCOME TO");
  delay (2000);
  lcd.setCursor(3, 1);
  lcd.print("SUPER MARKET");
  delay (2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Plz Add iTem");


}



void loop()
{
  count = 0;
  while (Serial.available() && count < 12)
  {
    input[count] = Serial.read();
    count++;
    delay(5);
  }
  int a = digitalRead(A4);

  if ((strncmp(input, "2700227A344B", 12) == 0) && (a == 1))
  {

    lcd.setCursor(0, 0);
    lcd.print("Butter Added       ");
    lcd.setCursor(0, 1);
    lcd.print("Price :- 10.00      ");
    p1++;
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    delay(2000);
    total = total + 10.00;
    count_prod++;
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);

  }
  else if ((strncmp(input, "2700227A344B", 12) == 0) && (a == 0))
  {
    if (p1 > 0)
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Butter Removed!!!        ");
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
      digitalWrite(6, LOW);
      delay(2000);
      p1--;
      total = total - 10.00;
      count_prod--;
      lcd.clear();
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      digitalWrite(6, HIGH);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Total Price :-");

      lcd.setCursor(0, 1);
      lcd.print(total);
    }
    else
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Not in cart!!!        ");
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
      digitalWrite(6, HIGH);
      delay(2000);
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      digitalWrite(6, LOW);
      lcd.clear();
    }
  }


  if ((strncmp(input, "4000350ABAC5", 12) == 0) && (a == 1))
  {
    lcd.setCursor(0, 0);
    lcd.print("Milk Added       ");
    lcd.setCursor(0, 1);
    lcd.print("Price :- 20.00      ");
    p2++;
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    delay(2000);
    total = total + 20.00;
    count_prod++;
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);

  }

  else if ((strncmp(input, "4000350ABAC5", 12) == 0) && (a == 0))
  {
    if (p2 > 0)
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Milk Removed!!!        ");
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
      digitalWrite(6, LOW);
      delay(2000);
      p2--;
      total = total - 20.00;
      count_prod--;
      lcd.clear();
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      digitalWrite(6, HIGH);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Total Price :-");
      lcd.setCursor(0, 1);
      lcd.print(total);
    }
    else
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Not in cart!!!        ");
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
      digitalWrite(6, HIGH);
      delay(2000);
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      digitalWrite(6, LOW);
      lcd.clear();
    }
  }


  if ((strncmp(input, "03007C2DA0F2", 12) == 0) && (a == 1))
  {
    lcd.setCursor(0, 0);
    lcd.print("Tea Added       ");
    lcd.setCursor(0, 1);
    lcd.print("Price :- 25.00      ");
    p3++;
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    delay(2000);
    total = total + 25.00;
    count_prod++;
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);

  }

  else if ((strncmp(input, "03007C2DA0F2", 12) == 0) && (a == 0))
  {
    if (p3 > 0)
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Tea Removed!!!        ");
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
      digitalWrite(6, LOW);
      delay(2000);
      p3--;
      total = total - 25.00;
      count_prod--;
      lcd.clear();
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      digitalWrite(6, HIGH);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Total Price :-");
      lcd.setCursor(0, 1);
      lcd.print(total);
    }
    else
    {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Not in cart!!!        ");
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
      digitalWrite(6, HIGH);
      delay(2000);
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      digitalWrite(6, LOW);
      lcd.clear();
    }
  }
}