/*
 * Created by ArduinoGetStarted.com
 *
 * This example code is in the public domain
 *
 * Tutorial page: https://arduinogetstarted.com/faq/how-to-input-a-multiple-digits-number-using-the-keypad
 */
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Keypad.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define NUMFLAKES     10 // Number of snowflakes in the animation example

#define LOGO_HEIGHT   16
#define LOGO_WIDTH    16
static const unsigned char PROGMEM logo_bmp[] =
{ B00000000, B11000000,
  B00000001, B11000000,
  B00000001, B11000000,
  B00000011, B11100000,
  B11110011, B11100000,
  B11111110, B11111000,
  B01111110, B11111111,
  B00110011, B10011111,
  B00011111, B11111100,
  B00001101, B01110000,
  B00011011, B10100000,
  B00111111, B11100000,
  B00111111, B11110000,
  B01111100, B11110000,
  B01110000, B01110000,
  B00000000, B00110000 };


const int ROW_NUM = 4; //four rows
const int COLUMN_NUM = 4; //four columns

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

Keypad keypad    = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
String inputString;
String inputStringA;
String inputStringB;
String inputStringC;
String inputStringD;
int inputInt = 0;
long inputIntA = 0;
long inputIntB = 0;
long inputIntC = 0;
long inputIntD = 0;
int button;
int brew = 0;
//char key;
char keyA;
char keyB;
char key;


void setup() {
  Serial.begin(9600);
  inputString.reserve(10); // maximum number of digit for a number is 10, change if needed
  inputStringA.reserve(10); // maximum number of digit for a number is 10, change if needed
  inputStringB.reserve(10); // maximum number of digit for a number is 10, change if needed

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  display.clearDisplay();

delay(1000);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println(F("Coffee\nSnobs"));
  display.display();
//

//
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1.6);
  display.setCursor(0,0);
  display.println(F("Coffee Snob Setup"));
  display.println(F("For Help press *"));
  display.display();
  delay(2000);
  display.setTextSize(1);
  display.setCursor(0,20);
  display.println(F("How much coffee \ndid you ground?"));
  display.display();


}


void loop() {
  char key = keypad.getKey();
    if (key >= '0' && key <= '9')// only act on numeric keys
    {
      inputString += key; // append new character to input string
    }
    else if (key == 'A') {
      if (inputString.length() > 0) {
        inputIntA = inputString.toInt(); // YOU GOT AN INTEGER NUMBER
        inputString = "";// clear input
        Serial.println(inputIntA);
        display.println(inputIntA,"g");
        display.display();
      }else{Serial.println(inputIntA),"g";
      }
      delay(3000);
      display.clearDisplay();
      display.setTextSize(1.6);
      display.setCursor(0,0);
      display.println(F("Coffee Snob Setup"));
      display.println(F("For Help press *"));
      display.display();
      display.setTextSize(1);
      display.setCursor(0,20);
      display.println(F("What is your\nbrew ratio?"));
      display.display();
    }
    else if (key == 'B') {
      if (inputString.length() > 0) {
        inputIntB = inputString.toInt(); // YOU GOT AN INTEGER NUMBER
        inputString = "";// clear input
        Serial.println(inputIntB);
        display.println(inputIntB);
        display.display();
      }else{Serial.println(inputIntB);}
      delay(3000);
      display.clearDisplay();
      display.setTextSize(1.6);
      display.setCursor(0,0);
      display.println(F("Coffee Snob Setup"));
      display.display();
      display.setTextSize(1);
      display.setCursor(0,10);
      display.println(F("Press C for your\nbrew recipe"));
      display.display();
    }

  if (key == 'C') {
    display.clearDisplay();
  display.setTextSize(1.6);
  display.setCursor(0,0);
  display.println(F("Coffee Snob Recipe"));
  display.display();
  display.setTextSize(1);
  display.setCursor(0,10);
  int math = (inputIntA * inputIntB);
  display.print(F("Coffee Setup: "));
  display.print(inputIntA);
  display.print(F("g"));
  display.println();
  display.print(F("Brewing Ratios: 1/"));
  display.print(inputIntB);
  display.println();
  display.print(F("Brew Recipe: "));
  display.print(math);
  display.print(F("ml"));
  display.println();
  display.setCursor(0,40);
  display.println(F("Press D to\nbegin brewing"));
  display.display();
  display.display();
  inputString = ""; // clear input
Serial.println(inputIntA);
Serial.print(inputIntB);

    Serial.println(math);
  }
  else if (key == 'D') {
    Serial.println("Button D");
  }
  else if (key == '*') {
    Serial.println("Clear");
    display.clearDisplay();
    display.setTextSize(1.6);
    display.setCursor(0,0);
    display.println(F("Coffee Snob Setup"));
    display.display();
    display.setTextSize(1);
    display.setCursor(0,10);
    display.println(F("A = Coffee Setup"));
    display.println(F("B = Brewing Ratios"));
    display.println(F("C = Brew Recipe"));
    display.println(F("D = Start"));
    display.println(F("# = Enter"));
    display.println(F("* = Setup Page"));
    display.display();
    inputIntA = "0";
    inputIntB = "0";
     delay(5000);
    setup();
  }
}



/*
void ButtonC (){
  display.clearDisplay();
  display.setTextSize(1.6);
  display.setCursor(0,0);
  display.println(F("Coffee Snob Recipe"));
  display.display();
  display.setTextSize(1);
  display.setCursor(0,10);
  display.println(F("Coffee Setup: "));
  display.println(inputIntA);
  display.println(F("Brewing Ratios: "));
  display.println(inputIntB);
  display.println(F("C = Brew Recipe: "));
  display.display();
  inputString = ""; // clear input
Serial.println(inputIntA);
Serial.print(inputIntB);
}

*/