#include "RTClib.h"  //  RTC library
#include <Wire.h>   // i2c libary
#include <Adafruit_GFX.h>   //  graphic library
#include <Adafruit_SSD1306.h>   // oled library

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);  //  initialize display

#define NUMFLAKES     10 // Number of snowflakes in the animation example

#define LOGO_HEIGHT   16
#define LOGO_WIDTH    16
RTC_DS3231 rtc;  //  rtc class

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup () {

  Serial.begin(9600);

  delay(3000); // wait for console opening

  if (! rtc.begin()) {      //   initialize RTC
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // If the RTC have lost power it will sets the RTC to the date & time this sketch was compiled in the following line
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));  // set time from computer time
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }

  // If you need to set the time of the uncomment line 34 or 37
  // following line sets the RTC to the date & time this sketch was compiled
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // This line sets the RTC with an explicit date & time, for example to set
  // January 21, 2014 at 3am you would call:
  // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();
  delay(2000); // Pause for 2 seconds

  // Clear the buffer
  display.clearDisplay();

}

void loop () {

  displayTime();   // printing time function for oled
}


void displayTime(void) {
  DateTime now = rtc.now();
  display.clearDisplay();

  display.setTextSize(1);             // Normal 1:1 pixel scale
   display.setCursor(0,0);
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.print("  void loop Robotech");
  display.setCursor(15, 15);            // Start at top-left corner
  display.print(now.year(), DEC);
  display.print('/');
  display.print(now.month(), DEC);
  display.print('/');
  display.print(now.day(), DEC);

  display.print(" ");


  display.print(daysOfTheWeek[now.dayOfTheWeek()]);
  display.println();
  display.println();
  display.setTextSize(2);
  display.print("  ");
  display.print(now.hour(), DEC);
  display.print(':');
  display.print(now.minute(), DEC);
  display.print(':');
  display.print(now.second(), DEC);
  display.println();

  display.display();
  delay(1000);
}