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

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

// LCD Connection:
// GND - GND
// VCC - 5V
// SDA - A4
// SCL - A5

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 Arduino
// 1      2
// 2      3
// 3      4
// 4      5
// 5      6
// 6      7
// 7      8
// 8      9

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );

String input_value;
long input_int;


#define D0 22
#define D1 23
#define D2 24
#define D3 25
int mode = 0;
int totalCycle = 10;
unsigned long previousTimeMode = 0;
int totalDoor = 0;
unsigned long delayAfterCycle = 10 * 1000;  
unsigned long elapsed = 0;
unsigned long currentTime = 0;
unsigned long startTime = 0;

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.clear();
  lcd.backlight();
  Serial.begin(9600);
  pinMode(D0, OUTPUT);
  pinMode(D1, OUTPUT);
  pinMode(D2, OUTPUT);
  pinMode(D3, OUTPUT);
  unsigned long startTime = millis();

}

void loop() {
  // put your main code here, to run repeatedly:
  if(mode == 0){
    
    lcd.setCursor(18,0);lcd.print("M");lcd.print(mode);
    lcd.setCursor(0,0);lcd.print("Cycle: ");lcd.print(totalCycle);
    lcd.setCursor(0,1);lcd.print("Doors: ");lcd.print(totalDoor);lcd.setCursor(15,1);lcd.print("Run:A");
    lcd.setCursor(0,2);lcd.print("Cycle Time: ");lcd.print(delayAfterCycle/1000);lcd.print("s");
    lcd.setCursor(0,3);lcd.print("Next Page:C");
    lcd.setCursor(14,3);lcd.print("Mode:D");
    
    char key = keypad.getKey();
    if(key){
    }if(key == 'C'){
      lcd.clear();
      mode = 1;
      unsigned long startTime = millis();
      unsigned long elapsed = 0;

    }else if(key == 'D'){

    }else if(key == 'A'){
      lcd.clear();
      mode = 2;
      unsigned long startTime = millis();
      unsigned long elapsed = 0;
      lcd.clear();
    }



  }else if(mode == 1){
    lcd.setCursor(18,0);lcd.print("M");lcd.print(mode);
    lcd.setCursor(0,3);lcd.print("Back Page:C");

    char key = keypad.getKey();
    if(key){
    }if(key == 'C'){
      lcd.clear();
      
      unsigned long currentTime = millis();
      unsigned long elapsed = 0;
      mode = 0;

    }else if(key == 'D'){

    }else if(key == 'A'){

    }

  }else if(mode == 2){
    elapsed = (millis() - startTime);
    lcd.setCursor(0,0);lcd.print(elapsed);
    

  }

}