#include <Keypad.h>
#include "LiquidCrystal_I2C.h"

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', '#', '.'}
};

int count;

byte rowPins[ROWS] = {5,4,3,2};
byte colPins[COLS] = {11,10,9,8};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

LiquidCrystal_I2C lcd(0x27, 16, 2);

int cursorColumn = 0;

String pad; //variable used to combine key inputs
char key;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  keypad.setDebounceTime(10);
}

void loop() {
  //Serial.println("Starting menu");
  lcd.setCursor(0,0);
  lcd.print("Select");
  lcd.setCursor(0,1);
  lcd.print("A-Out|B-In");

  pad = "";

  char select = keypad.getKey();

  switch(select){
    case 'A':
      //Serial.println("case");
      lcd.clear();
      outputMenu();
      
      break;
    case 'B':
      lcd.clear();
      inputMenu();   
  }
}

void readKey(){//for diesel values
  //Serial.println("readkey");
  key = keypad.getKey();
  Serial.println(key);
  if (key != '#' && key != 'A' && key != 'B' && key != 'C'&& key != '*'){
    String val = String(key);
    pad += val;
  }
}

int outputMenu(){
  while(1){
    readKey();
    lcd.setCursor(0,0);
    lcd.print("Diesel Amount:");
    if (key == '#'){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("Saving");
        delay(3000);
        pad = "";
        continue;
    }
      else if (key == '*'){
        lcd.clear();
        pad = "";
      }
      else if (key == 'C'){
        lcd.clear();
        pad = "";
        break;
      }
      else if (key){
        lcd.setCursor(0,1);
        lcd.print(pad);
      }
  }    
}

int inputMenu(){
  while(1){
    readKey();
    lcd.setCursor(0,0);
    lcd.print("Delivery Amount:");
    if (key == '#'){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("Saving");
        delay(3000);
        pad = "";
        continue;
    }
      else if (key == '*'){
        lcd.clear();
        pad = "";
      }
      else if (key == 'C'){
        lcd.clear();
        pad = "";
        break;
      }
      else if (key){
        lcd.setCursor(0,1);
        lcd.print(pad);
      }
  }    
}