#include <Adafruit_SSD1306.h>
#include "RTClib.h"
#include <Adafruit_GFX.h>
#include <avr/pgmspace.h>

RTC_DS1307 rtc;
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET 4
bool var = false;
int Btn1 = 2;
float timeHour,timeMin,timeSec,secDegree,minDegree,hourDegree;
int timeHour1,timeMin1,timeSec1;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup()
{
  Serial.begin(9600);  
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
    if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
      pinMode(Btn1, INPUT);
  attachInterrupt(digitalPinToInterrupt(Btn1), code, RISING);
  cli(); 
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT0  = 0;
  TCCR1B |= B00000100;
  TIMSK1 |= B00000010;
  OCR1A = 6250;
  sei();


}
void loop(){
  DateTime now = rtc.now(); 
if (var == true)
{
  
  display.clearDisplay();
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font

  timeHour1 = (now.hour());
  timeMin1 = (now.minute());
  timeSec1 = (now.second());

  if (timeHour1 < 10)
  {
    display.print("0");
  }
  display.print(timeHour1);
  display.print(':');
  if (timeMin1 < 10)
  {
    display.print("0");
  }
  display.print(timeMin1);
  display.print(':');
  if (timeSec < 10)
  {
    display.print("0");
  }
  display.print(timeSec1);
  display.display();
  delay(1000);
}
else
{
  int c_width = display.width()/2;
  int c_height = display.height()/2;

  timeHour = (now.hour());
  timeMin = (now.minute());
  timeSec = (now.second());

  secDegree = timeSec*6;
  minDegree = (timeMin+(timeSec/60))*6;
  hourDegree = (timeHour+(timeMin/60)+(timeSec/360))*30;
  
    display.clearDisplay();
    display.drawCircle(c_width, c_height , 1, SSD1306_WHITE);
    for (int a =0;a <=360; a=a+6)
    {
      display.drawLine(c_width+(sin(a*0.0174533)*30), c_height+(cos(a*0.0174533)*30) , c_width+(sin(a*0.0174533)*30), c_height+(cos(a*0.0174533)*30), SSD1306_WHITE);
    }
    for (int a =0;a <=360; a=a+30)
    {
      display.drawLine(c_width+(sin(a*0.0174533)*30), c_height+(cos(a*0.0174533)*30) , c_width+(sin(a*0.0174533)*25), c_height+(cos(a*0.0174533)*25), SSD1306_WHITE);
    }

    display.drawLine(c_width, c_height , c_width+(sin(secDegree*0.0174533)*28), c_height-(cos(secDegree*0.0174533)*28), SSD1306_WHITE);
    display.drawLine(c_width, c_height , c_width+(sin(minDegree*0.0174533)*20), c_height-(cos(minDegree*0.0174533)*20), SSD1306_WHITE);
    display.drawLine(c_width, c_height , c_width+(sin(hourDegree*0.0174533)*12), c_height-(cos(hourDegree*0.0174533)*12), SSD1306_WHITE);
  display.display();
  
}
}

void code()
{
var =! var;
}
ISR(TIMER1_COMPA_vect)
{

}