#include "SevSeg.h"
#include <Keypad.h>

SevSeg sevseg; //Instantiate a seven segment controller object

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 colPins[COLS] = {A4,A5,A6,A7};
byte rowPins[ROWS] = {A0,A1,A2,A3};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
float Num1,Num2,Number;
char key,action;
boolean result = false;

void setup(){
byte numDigits = 4;
byte digitPins[] = {2, 3, 4, 5};
byte segmentPins[] = {6, 7, 8, 9, 10, 11, 12, 13};
bool resistorsOnSegments = false; // 'false' means resistors are on digit pins
byte hardwareConfig = COMMON_CATHODE; // See README.md for options
bool updateWithDelays = false; // Default. Recommended
bool leadingZeros = false; // Use 'true' if you'd like to keep the leading zeros

sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments, updateWithDelays, leadingZeros);
sevseg.setBrightness(90);

Serial.begin(9600);
}

void loop(){
// if (key!=NO_KEY)
DetectButtons();

if (result==true){
CalculateResult();
}

DisplayResult();

sevseg.refreshDisplay();
}

void DetectButtons(){

char key = keypad.getKey();

if (key=='*'){ //If cancel Button is pressed
Serial.println ("Button Cancel");
sevseg.blank();
Number=Num1=Num2=0;
result=false;
}

if (key == '#')
{Serial.println ("Button Equal");
sevseg.setChars("eq");
Num2=Number;
result = true;
}
if(key == '1'){
if (Number==0){
Number=1;
}
else {
Number = (Number*10) + 1; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '2'){
if (Number==0){
Number = 2;
}
else {
Number = (Number*10) + 2; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '3'){
if (Number==0){
Number = 3;
}
else {
Number = (Number*10) + 3; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '4'){
if (Number==0){
Number = 4;
}
else {
Number = (Number*10) + 4; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '5'){
if (Number==0){
Number = 5;
}
else {
Number = (Number*10) + 5; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '6'){
if (Number==0){
Number = 6;
}
else {
Number = (Number*10) + 6; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '7'){
if (Number==0){
Number = 7;
}
else {
Number = (Number*10) + 7; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '8'){
if (Number==0){
Number = 8;
}
else {
Number = (Number*10) + 8; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '9'){
if (Number==0){
Number = 9;
}
else {
Number = (Number*10) + 9; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}
if(key == '0'){
if (Number==0){
Number = 0;
}
else {
Number = (Number*10) + 0; //Pressed twice
}
Serial.println(Number);
sevseg.setNumber(Number);
}

if (key == 'A' || key == 'B' || key == 'C' || key == 'D') //Detecting Buttons on Column 4
{
Num1 = Number;
Number =0;
if (key == 'A'){
Serial.println ("Addition");
sevseg.setChars("plus");
action = '+';
}
if (key == 'B'){
Serial.println ("Subtraction");
sevseg.setChars("kura");
action = '-';
}
if (key == 'C')
{
Serial.println ("Multiplication");
sevseg.setChars("kali");
action = '*';}
if (key == 'D')
{Serial.println ("Division");
sevseg.setChars("ba9i");
action = '/';
}
delay(100);
}
}

void CalculateResult()
{
if (action=='+')
Number = Num1+Num2;

if (action=='-')
Number = Num1-Num2;

if (action=='*')
Number = Num1*Num2;

if (action=='/')
Number = Num1/Num2;
}
void DisplayResult()
{
if (result==true){
sevseg.setNumber(Number, 1);
}
}