#include "RTClib.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1

int16_t x1, y1;
uint16_t textWidth, textHeight;

RTC_DS1307 rtc;

char daysOfTheWeek[7][12] = {"Sonntag", "Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag"};

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup () {
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
}

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

  if(now.hour() >= 10 && now.minute() >= 10){
    String tempString = String(now.hour()) + ":" + String(now.minute());
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.getTextBounds(tempString, 0, 0, &x1, &y1, &textWidth, &textHeight);
    display.setCursor(64 - (textWidth / 2), 32 - (textHeight / 2));
    display.print(tempString);
  }

  if(now.hour() < 10 && now.minute() >= 10){
    String tempString = "0" + String(now.hour()) + ":" + String(now.minute());
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.getTextBounds(tempString, 0, 0, &x1, &y1, &textWidth, &textHeight);
    display.setCursor(64 - (textWidth / 2), 32 - (textHeight / 2));
    display.print(tempString);
  }

  if(now.hour() >= 10 && now.minute() < 10){
    String tempString = String(now.hour()) + ":" + "0" + String(now.minute());
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.getTextBounds(tempString, 0, 0, &x1, &y1, &textWidth, &textHeight);
    display.setCursor(64 - (textWidth / 2), 32 - (textHeight / 2));
    display.print(tempString);
  }

  if(now.hour() < 10 && now.minute() < 10){
    String tempString = "0" + String(now.hour()) + ":" + "0" + String(now.minute());
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.getTextBounds(tempString, 0, 0, &x1, &y1, &textWidth, &textHeight);
    display.setCursor(64 - (textWidth / 2), 32 - (textHeight / 2));
    display.print(tempString);
  }

  display.display();
}