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

LiquidCrystal_I2C lcd(0x27, 16, 4);

byte sec, minu, h, d;
int upButton = 9;
int downButton = 8;
int selectButton = 7;

unsigned long rtc_start;
unsigned long rtc_current;
unsigned long rtc_interval = 1000;

unsigned long m_start;
unsigned long m_current;
unsigned long m_interval = 200;

void setup() {
  lcd.begin(20, 4);
  lcd.backlight();
 // lcd.createChar(0, select);
 // lcd.createChar(1, nichts);
  //lcd.createChar(1, back);
  pinMode(upButton, INPUT_PULLUP);
  pinMode(downButton, INPUT_PULLUP);
  pinMode(selectButton, INPUT_PULLUP);
 // pinMode(13, OUTPUT);
  rtc_start = millis();
  
}

void loop() {
  //rtc();
  setTime();
}


void setTime(){
  m_current = millis();
  if (!digitalRead(upButton) && h < 24){

    if (m_current - m_start >= m_interval){
      m_start = m_current; 
      minu = minu + 5;
    }
  }

  if (!digitalRead(downButton) && minu > 0){

    if (m_current - m_start >= m_interval){
      m_start = m_current; 
      minu = minu - 5;
    }
  }

  if (!digitalRead(downButton) && minu == 0 && h >= 1){

    if (m_current - m_start >= m_interval){
      m_start = m_current; 
      minu = 55;
      h = h - 1;
    }
  }

  if(minu >= 60){
    if(h < 24){
      h = h + 1; 
      minu = 0;
    }
    else 
    {
      h = 24;
    }
  }


  afficheDecale(13, 1, sec);
  afficheDecale(10, 1, minu);
  afficheDecale(7, 1, h);
  afficheDecale(4, 1, d);

  ////Separation sec, min, heure et jour
  afficheText(6, 1, "/" );
  afficheText(9, 1, "/" );
  afficheText(12, 1, "/" );
} 


///////////////
void rtc(){
  rtc_current = millis(); 
  if (rtc_current - rtc_start >= rtc_interval){
    rtc_start += rtc_interval; 
    sec = sec + 1;
  }
  if(sec >= 60){
    minu = minu + 1; 
    sec = 0;
  }
  if(minu >= 60){
    h = h + 1; 
    minu = 0;
  }
  if(h >= 24){
    d = d + 1; 
    h = 0;
  }

  afficheDecale(13, 1, sec);
  afficheDecale(10, 1, minu);
  afficheDecale(7, 1, h);
  afficheDecale(4, 1, d);

  ////Separation sec, min, heure et jour
  afficheText(6, 1, "/" );
  afficheText(9, 1, "/" );
  afficheText(12, 1, "/" );
} 
//Gestion de l'affiche avec decalage de chiffres
void afficheDecale(int col, int row, byte value){
  if (value > -10 && value < 10){
    afficheValue(col, row, 0);
    afficheValue((col + 1), row, value);
  }
  else{
    afficheValue(col, row, value);
  }
}

// affichage du texte à une positon donnée
void afficheText(int col, int row, String text){
  lcd.setCursor(col, row);
  lcd.print(text);
}

// affichage de la valeur d'une variable Integer à une positon donnée
void afficheValue(int col, int row, byte value){
  lcd.setCursor(col, row);
  lcd.print(value);
}