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

# define BUTTON_PIN A0
# define NO_BUTTON 0
# define BUTTON1 1
# define BUTTON2 2
# define BUTTON3 3

# define DELAY_TIME 100
# define STARTING "  starting ...  "

# define TIME_OFFSET 1672531200
# define TIME_LINE 0

LiquidCrystal_I2C lcd (0x27, 16, 2);

time_t current_time = 0;
bool time_has_moved = false;

unsigned short button_pressed = 0;
unsigned short button_clicked = 0;

//const char *ALL_MENU[] = {};

void setup()
{
  
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.display();
  lcd.clear();
  lcd.print(STARTING);

  setup_time();

  Serial.begin(9600);
}

void setup_time(){

  setTime(TIME_OFFSET);
}

void loop()
{
  
  get_current_time();
  capture_button_click();

  //if (time_has_moved) display_current_time();
  if (button_clicked) print_button_clicked();

  delay(DELAY_TIME); 
}

void capture_button_click(){
	 
  int temp = analogRead(BUTTON_PIN);
  
  if (temp < 200){
    
    if (button_pressed == NO_BUTTON){
      button_clicked = NO_BUTTON;
    }
      
    
    else if (button_clicked == NO_BUTTON){
      button_clicked = button_pressed;
    }
    
    button_pressed = NO_BUTTON;
  }
  
  else if (temp < 400)
    button_pressed = BUTTON1;
  
  else if (temp < 1000)
    button_pressed = BUTTON2;
  
  else 
    button_pressed = BUTTON3;

    Serial.println(button_clicked);
}

void print_button_clicked(){
  
  char buffer[10];

  sprintf(buffer, "Clicked B%d", button_clicked);
  lcd.clear();
  lcd.setCursor(3, 0);
  lcd.print(buffer);

}


void get_current_time(){

  time_t t = now();

  if (t != current_time ){

    current_time = t;
    time_has_moved = true;
  }
  else
    time_has_moved = false;
}

void display_current_time(){

  char buffer[16];
  int h = hour(current_time);
  int m = minute(current_time);
  int s = second(current_time);
  int w = weekday(current_time);
  int D = day(current_time);
  int M = month(current_time);

  sprintf(buffer, "%02d/%02d   %02d:%02d:%02d", D, M, h, m, s);
  lcd.setCursor(0, TIME_LINE);
  lcd.print(buffer);

}