#include "RTClib.h"

#include <Wire.h>

// oled display
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

RTC_DS1307 rtc;



// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(128, 64, &Wire, -1);

int ShiftYH;
int ShiftXH;
int shr;
int smin;
int ShiftYM;
int ShiftXM;
int ShiftYS;
int ShiftXS;
int ssec;
int stcount = 0;
int stmin = 0;
int sthr = 0;

int product = 3;
int activestopwatch = 0;
int stpause = 0;

long initialsec;
long finalsec;


void setup() {

  Serial.begin(9600);
  rtc.begin();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3c);

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  } 


  // asks for initial hour and minute
  Serial.println("asking for hour (enter less then 13)");
  while(Serial.available()==0){}
  shr = Serial.parseInt();
  Serial.end();  
  Serial.begin(9600);
  Serial.println("asking for minute (enter less than 60)");
  while(Serial.available()==0){}
  smin = Serial.parseInt();
  Serial.end();  
  Serial.begin(9600);
  Serial.println("asking for seconds (enter less than 60)");
  while(Serial.available()==0){}
  ssec = Serial.parseInt();
  Serial.println(shr);
  Serial.println(smin);
  Serial.println(ssec);
  DateTime newTime = DateTime(2000, 10, 23, shr, smin, ssec);//(year,month,day,hour,min,sec)
  rtc.adjust(newTime); //sets the new RTC adjust 

  pinMode(2, INPUT_PULLUP);
  attachInterrupt(0,button,CHANGE);
  
}


void loop() {

  DateTime now = rtc.now(); 
  display.clearDisplay();
  display.setCursor(0,0); 
  ssec = now.second();
  smin = now.minute();
  shr = now.hour();


  
  int count = 330;
  String digitaltime(unsigned int count){
  unsigned int asecond=count%60;
  unsigned int aminute=((count-second)%3600)/60;
  unsigned int ahour=(count-(count%3600))/3600;
  return String(ahour)+":"+String(aminute)+":"+String(asecond);
  Serial.println(ahour);
  Serial.println(aminute);
  Serial.println(asecond);
  delay(1000);
  }
}

//------------------------------------------------------functions

void analogclk() {
  //displaying numbers
    display.setTextSize(1);
    display.setTextColor(WHITE);
    DateTime now = rtc.now();
    display.setCursor(70,4);
    display.print("12");
    display.setCursor(98,27);
    display.print("3");
    display.setCursor(75,54);
    display.print("6");
    display.setCursor(50,27);
    display.print("9");

    //finding angle in radians of minute and hour
    float hrAngle = (shr*0.5236) - 1.5708;
    float minAngle = (smin*0.10472) - 1.5708;
    float secAngle = (ssec*0.10472) - 1.5708;

    //calculates the rectangular form of the hour minute and seconds handle
    ShiftYH = 8*(sin(hrAngle)) + 32;
    ShiftXH = 8*(cos(hrAngle)) + 75;
    ShiftYM = 17*(sin(minAngle)) + 32;
    ShiftXM = 17*(cos(minAngle)) + 75;
    ShiftYS = 17*(sin(secAngle)) + 32;
    ShiftXS = 17*(cos(secAngle)) + 75;

    display.drawCircle(75, 32, 31, WHITE); //draws the circle and the hour minute and second handle
    display.drawLine(75, 32, ShiftXH, ShiftYH, WHITE);
    display.drawLine(75, 32, ShiftXM, ShiftYM, WHITE);
    display.drawLine(75, 32, ShiftXS, ShiftYS, WHITE);
    display.display();
}

void digitalclk() {
    //display current time
      display.setTextSize(2);
      display.setTextColor(WHITE);
      DateTime now = rtc.now(); 
      display.print(now.hour()); 
      display.print(":");
      display.print(now.minute());  
      display.print(":");
      display.print(now.second()); 
      display.display();   
}

void stopwatch() {
  
  display.setTextSize(3);
  display.setCursor(0,0);
  display.print(sthr); 
  display.print(":");
  display.print(stmin);  
  display.print(":");
  display.print(stcount); 
  display.display();



}

void button() {
  if(digitalRead(2)==0){
    initialsec=millis();
    finalsec=0;
  }
  else if(digitalRead(2)==1){
    finalsec=millis();
    long difference = finalsec-initialsec;
    Serial.println(difference);
  }
}