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

# define BUTTON_PIN A0
# define BUTTON1_PIN A0
# define BUTTON2_PIN A1
# define BUTTON3_PIN A2
# 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
# define TIME_MAX_DELAY 10

void setup_time();
void capture_button_click();
void capture_button_click_v2();
void handle_button_clicked();
void handle_no_action_since_last_long();
void get_current_time();
void display_current_time();
void detect_action();

LiquidCrystal_I2C lcd (0x27, 16, 2);

time_t current_time = 0;
time_t action_time = 0;
bool time_has_moved = false;

bool screen_is_up = false;

unsigned short button_pressed = 0;
unsigned short button_clicked = 0;
bool action_detected = false;

//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);
  handle_no_action_since_last_long();
}

void setup_time(){

  setTime(TIME_OFFSET);
}

void loop()
{
  
  get_current_time();
  capture_button_click_v2();

  if (button_clicked != NO_BUTTON) handle_button_clicked();
  
  if (screen_is_up){
    if (action_detected && time_has_moved) {
      display_current_time();
    }
    else if (! action_detected) {
      handle_no_action_since_last_long();
    }
  }

  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 capture_button_click_v2(){

  if (analogRead(BUTTON1_PIN) == 0)
    button_pressed = BUTTON1;

  else if (analogRead(BUTTON2_PIN) == 0)
    button_pressed = BUTTON2;

  else if (analogRead(BUTTON3_PIN) == 0)
    button_pressed = BUTTON3;

  else {

    if (button_pressed == NO_BUTTON){
      button_clicked = NO_BUTTON;
    }
      
    else if (button_clicked == NO_BUTTON){
      button_clicked = button_pressed;
    }
    
    button_pressed = NO_BUTTON;
  }

  detect_action();
    
}

void detect_action(){

  if (button_clicked != NO_BUTTON){
  
   
    action_time = current_time;
    action_detected = true;
  }
    
  else if (action_detected && ((current_time - TIME_MAX_DELAY) > action_time)){
    action_detected = false;
  }
    
}

void handle_button_clicked(){

  screen_is_up = true;
}

void handle_no_action_since_last_long(){

  lcd.clear();
  lcd.noBacklight();
  screen_is_up = false;
}

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);

}