#include <LiquidCrystal_I2C.h>
#include <Keypad.h> // Download library for Keypad from https://github.com/Chris--A/Keypad


LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x3F for a 16 chars and 2 line display
const byte ROWS = 4; // Four rows
const byte COLS = 4; // Three columns

// Define the Keymap
char keys[ROWS][COLS] = {

  {'1','2','3','A'},

  {'4','5','6','B'},

  {'7','8','9','C'},

  {'*','0','#','D'}

};

/*
byte rowPins[ROWS] = { 0, 1, 2, 3 };// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte colPins[COLS] = { 4, 5, 6, 7 }; // Connect keypad COL0, COL1 and COL2 to these Arduino pins.
*/

byte rowPins[ROWS] = { 4, 5, 6, 7};// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte colPins[COLS] = { 8, 9, 10, 11 }; // Connect keypad COL0, COL1 and COL2 to these Arduino pins.

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

const int rs = 8, en = 9, d4 = 10, d5 = 11, d6 = 12, d7 = 13; //Pins to which LCD is connected
//LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

 long Num1,Num2,Number, Num3;
 char key,action;
 boolean result = false;
 



void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.clear();         
  lcd.backlight();      // Make sure backlight is on
 lcd.begin(16, 2); //We are using a 16*2 LCD display
  //lcd.print("DIY Calculator"); //Display a intro message
  lcd.setCursor(0, 1);   // set the cursor to column 0, line 1
  //lcd.print("-CircuitDigest"); //Display a intro message 

   delay(2000); //Wait for display to show info
    lcd.clear(); //Then clean it

                                 
  attachInterrupt(digitalPinToInterrupt(19),M_plus,RISING);  //  function for creating external interrupts at pin19 on Rising (LOW to HIGH)
  attachInterrupt(digitalPinToInterrupt(18),M_minus,RISING);  //  function for creating external interrupts at pin18 on Rising (LOW to HIGH)   
  attachInterrupt(digitalPinToInterrupt(3),MR,RISING);  //  function for creating external interrupts at pin3 on Rising (LOW to HIGH)   
  attachInterrupt(digitalPinToInterrupt(2),MC,RISING);  //  function for creating external interrupts at pin2 on Rising (LOW to HIGH)   

}
void loop() {
   
key = kpd.getKey(); //storing pressed key value in a char

if (key!=NO_KEY)
DetectButtons();

if (result==true)
CalculateResult();

DisplayResult();   

}


void DetectButtons()
{ 
     lcd.clear(); //Then clean it
    if (key=='*') //If cancel Button is pressed
    {Serial.println ("Button Cancel"); Number=Num1=Num2=Num3=0; result=false;}
    
     if (key == '1') //If Button 1 is pressed
    {Serial.println ("Button 1"); 
    if (Number==0)
    Number=1;
    else
    Number = (Number*10) + 1; //Pressed twice
    }
    
     if (key == '4') //If Button 4 is pressed
    {Serial.println ("Button 4"); 
    if (Number==0)
    Number=4;
    else
    Number = (Number*10) + 4; //Pressed twice
    }
    
     if (key == '7') //If Button 7 is pressed
    {Serial.println ("Button 7");
    if (Number==0)
    Number=7;
    else
    Number = (Number*10) + 7; //Pressed twice
    } 
  

    if (key == '0')
    {Serial.println ("Button 0"); //Button 0 is Pressed
    if (Number==0)
    Number=0;
    else
    Number = (Number*10) + 0; //Pressed twice
    }
    
     if (key == '2') //Button 2 is Pressed
    {Serial.println ("Button 2"); 
     if (Number==0)
    Number=2;
    else
    Number = (Number*10) + 2; //Pressed twice
    }
    
     if (key == '5')
    {Serial.println ("Button 5"); 
     if (Number==0)
    Number=5;
    else
    Number = (Number*10) + 5; //Pressed twice
    }
    
     if (key == '8')
    {Serial.println ("Button 8"); 
     if (Number==0)
    Number=8;
    else
    Number = (Number*10) + 8; //Pressed twice
    }   
  

    if (key == '#') // if equal is pressed
    {Serial.println ("Button Equal"); 
    Num2=Number;
    Num3=Number;
    result = true;
    }
    
     if (key == '3')
    {Serial.println ("Button 3"); 
     if (Number==0)
    Number=3;
    else
    Number = (Number*10) + 3; //Pressed twice
    }
    
     if (key == '6')
    {Serial.println ("Button 6"); 
    if (Number==0)
    Number=6;
    else
    Number = (Number*10) + 6; //Pressed twice
    }
    
     if (key == '9')
    {Serial.println ("Button 9");//if key 9 is pressed
    if (Number==0)
    Number=9;
    else
    Number = (Number*10) + 9; //Pressed twice
    }  

      if (key == 'A' || key == 'B' || key == 'C' || key == 'D') //Detecting Buttons on Column 4
  {
    Num1 = Number;    
    Number =0;
    if (key == 'A') // key A for addition
    {Serial.println ("Addition"); action = '+';}
     if (key == 'B')//key B for Subtraction
    {Serial.println ("Subtraction"); action = '-'; }
     if (key == 'C')//key C for multiplication
    {Serial.println ("Multiplication"); action = '*';}
     if (key == 'D')//Key D for division
    {Serial.println ("Devesion"); action = '/';}  

    delay(100);
  }
  

}

void CalculateResult()
{
  if (action=='+') // Addition operation
    Number = Num1+Num2+Num3;
   /*
    if (mem_plus == 1){
        mem_store = Number;
    }else if(mem_minus ==1){
      mem_store =mem_store-Number;
    }
*/
  if (action=='-')//subtraction operation
    Number = Num1-Num2-Num3;

  if (action=='*'){//Multiplication operation
          if(Num3==0) Num3=1;
            Number = Num1*Num2*Num3;
  }
  if (action=='/'){//Division operation
     if(Num3==0) {Serial.println("Cannot divide by zero");}
     Num3=1;
    Number = Num1/Num2/Num3;

  }

}


//Display the Results
void DisplayResult()
{
  
  lcd.setCursor(0, 0);   // set the cursor to column 0, line 1
  lcd.print(Num1); lcd.print(action); lcd.print(Num2); lcd.print(action);lcd.print(Num3);
  
  if (result==true)
  {lcd.print(" ="); lcd.print(Number);} //Display the result
  
  lcd.setCursor(0, 1);   // set the cursor to column 0, line 1
  lcd.print(Number); //Display the result
}

void M_plus(){
  Serial.println("M+ is pressed");
 int mem_plus = 1;

}


void M_minus(){
  Serial.println("M- is pressed");
  int mem_minus = 1;
}


void MR(){
  Serial.println("MR is pressed");
  int mr=1;
}


void MC(){
  Serial.println("MC is pressed");
  int mc=1;
}