// include libraries
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

//define oled display parameters
#define screen_width 128 // OLED DISPLAY WIDTH IN PIXELS
#define screen_height 64 // OLED DISPLAY HEIGHT IN PIXELS
#define oled_reset -1 // REST PIN
#define screen_address 0x3C  // SEE DATA SHEET FOR ADDRESS

// declare objects
Adafruit_SSD1306 display(screen_width , screen_height ,&Wire , oled_reset);

//declare global variables
int days = 0;
int hours=0;
int minutes =0;
int seconds=0;

unsigned long timeNow =0;
unsigned long timeLast =0;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  if (!display.begin(SSD1306_SWITCHCAPVCC , screen_address)){
    Serial.println(F("SSD1306 allocation failed "));
    for(;;);
  }

  // turn on OLED DISPLAY
  display.display();
  delay(2000);

  // clear OLED DISPLAY

  display.clearDisplay();

  print_line("Welcome to Medibox!" , 10 ,20, 2);
  display.clearDisplay();

}

void loop() {
  // put your main code here, to run repeatedly:
  
  update_time();
  print_time_now();


}

void print_line(String text,int column , int row,  int text_size ){
  
  //display a custom message
  display.setTextSize (text_size);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(column,row) ; // COLUMN , ROW
  display.println(text);

  display.display();
  
}

void print_time_now(void){
  display.clearDisplay();
  
  print_line(String(days),0,0,2);
  print_line(":",20,0,2);
  print_line(String(hours),30 , 0 ,2);
  print_line(":",50,0,2);
  print_line(String(minutes),60,0,2);
  print_line(":",80,0,2);
  print_line(String(seconds),90,0,2);
  
}

void update_time(){
  timeNow = millis()/1000; // seconds passed from bootup
  seconds=timeNow-timeLast;

  if (seconds>= 60){
    
    minutes+=1 ; // minutes= minutes+ 1
    timeLast+=60; // timeLast = timeLast + 1

  }

  if (minutes==60){
    
    hours +=1; // hours = hours +1
    minutes =0 ;

  }

  if ( hours == 24){
    
    days +=1; // days = days +1
    hours = 0;
  }

}