// import used libraries 
#include <Wire.h>
#include "RTClib.h"
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <SPI.h>
 
 // initialize rtc module
RTC_DS3231 rtc;

// initialize tft screen
#define TFT_DC 2
#define TFT_CS 5
#define TFT_RST 4
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
 
 // define a list of 7 elements each up to 12 characters
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

//define the function for displaying the date
void displaydate() {
  tft.setTextColor(ILI9341_WHITE);
  tft.println("displaying today's date");

  String date = "YYYY-MM-DD";
  tft.setTextColor(ILI9341_GREEN);
  tft.println(date);
}


// setup function
void setup () {
 
  Serial.begin(9600);
 
  delay(3000); // wait for console opening
 
  // if the rtc module cannot be found it will display following error message 
  // in the IDE's serial
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC! MAKE SURE THE CIRCUIT IS CORRECT");
    // after displaying the error message it gets stuck in an infinite loop
    while (1);
  }
 
  // if the rtc loses power, it sets the time anew
  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // 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));
  }

  // startup of tft screen and parameter definition
  tft.begin();
  tft.setRotation(1); //makes the text oriented as it is in the simulation here

  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(1.5);
}

void loop () {
    DateTime now = rtc.now();
     
    tft.print(now.year(), DEC);
    tft.print('/');
    tft.print(now.month(), DEC);
    tft.print('/');
    tft.print(now.day(), DEC);
    tft.print(" (");
    tft.print(daysOfTheWeek[now.dayOfTheWeek()]);
    tft.print(") ");
    tft.print(now.hour(), DEC);
    tft.print(':');
    tft.print(now.minute(), DEC);
    tft.print(':');
    tft.print(now.second(), DEC);
    //tft.println();
     
    delay(3000);
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(0, 0);
}