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

RTC_DS1307 rtc;

#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define SCREEN_WIDTH 128
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


//unsigned int day_ctr, hr_ctr, min_ctr, sec_ctr, ms_ctr;
int day_ctr = 0;
int hr_ctr = 0;
int min_ctr = 0;
int sec_ctr = 0;
int ms_ctr = 0;


const float pi = 3.14159267 ;
const int clock_center_x = 32;
const int clock_center_y = 32;
int o = 1;

// variables used to calculate coordinates of points on the circle
int x;
int y;
int x1;
int y1;

// variables to store previous values read off RTC module
int second = 0;
int minute;
int hour;
int RTC;
//string time="A";
int m = 0;
int h = 0;
int s = 0 ;
int j = 1;

void setup() {

  Serial.begin(9600);
  Serial.setTimeout(1000);

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

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  if (rtc.isrunning()) {
    Serial.println("let's set the time!");

    Serial.println("Set the time [hour:min;seconds]: ");

    while (j != 0) {
      while (Serial.available() == 0) {}
      String timeStr = Serial.readString();
      int seperatorIndex1 = timeStr.indexOf(":");
      int seperatorIndex2 = timeStr.indexOf(";");
      h = timeStr.substring(0, seperatorIndex1).toInt(); // every charactors until : from the begining
      m = timeStr.substring((seperatorIndex1 + 1), seperatorIndex2).toInt();
      s = timeStr.substring(seperatorIndex2 + 1).toInt();
      j = 0;
    }

    Serial.println(h);
    Serial.println(m);
    Serial.println(s);


    rtc.adjust(DateTime(2022, 9, 25, h, m, s));



  }
  // 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();
  draw_clock_face();
  display.display();
  init_timer1_ovf_interrupt();
  attachInterrupt(digitalPinToInterrupt(3), stopWatch_start,RISING);
}

void draw_second(int second, int mode) {
  y = (24 * cos(pi - (2 * pi) / 60 * second)) + clock_center_y;
  x = (24 * sin(pi - (2 * pi) / 60 * second)) + clock_center_x;
  if (mode == 1) {
    display.drawCircle(x, y, 2, SSD1306_WHITE);
  }
  if (mode == 0) {
    display.drawCircle(x, y, 2, SSD1306_BLACK);
  }
}

void draw_hour(int hour, int minute, int mode) {

  y = (18 * cos(pi - (2 * pi) / 12 * hour - (2 * PI) / 720 * minute)) + clock_center_y;
  x = (18 * sin(pi - (2 * pi) / 12 * hour - (2 * PI) / 720 * minute)) + clock_center_x;
  y1 = (18 * cos(pi - (2 * pi) / 12 * hour - (2 * PI) / 720 * minute)) + clock_center_y + 1;
  x1 = (18 * sin(pi - (2 * pi) / 12 * hour - (2 * PI) / 720 * minute)) + clock_center_x + 1;
  if (mode == 1) {
    display.drawLine(clock_center_x, clock_center_y, x, y, SSD1306_WHITE);
    display.drawLine(clock_center_x + 1, clock_center_y + 1, x1, y1, SSD1306_WHITE);
  }
  else {
    display.drawLine(clock_center_x, clock_center_y, x, y, SSD1306_BLACK);
    display.drawLine(clock_center_x + 1, clock_center_y + 1, x1, y1, SSD1306_BLACK);
  }
}
void draw_minute(int minute, int mode) {
  y = (24 * cos(pi - (2 * pi) / 60 * minute)) + clock_center_y;
  x = (24 * sin(pi - (2 * pi) / 60 * minute)) + clock_center_x;
  if (mode == 1)display.drawLine(clock_center_x, clock_center_y, x, y, SSD1306_WHITE); else display.drawLine(clock_center_x, clock_center_y, x, y, SSD1306_BLACK);
}

void draw_clock_face(void) {
  // draw the center of the clock
  display.drawCircle(clock_center_x, clock_center_y, 3, SSD1306_WHITE);
  display.fillCircle(clock_center_x, clock_center_y, 3, SSD1306_WHITE);

  // draw hour pointers around the face of a clock
  for (int i = 0; i < 12; i++) {
    y = (32 * cos(pi - (2 * pi) / 12 * i)) + clock_center_y;
    x = (32 * sin(pi - (2 * pi) / 12 * i)) + clock_center_x;
    y1 = (28 * cos(pi - (2 * pi) / 12 * i)) + clock_center_y;
    x1 = (28 * sin(pi - (2 * pi) / 12 * i)) + clock_center_x;
    display.drawLine(x1, y1, x, y, SSD1306_WHITE);
  }
  // print string "12" at the top of the face of the clock
  display.drawCircle(26 * sin(pi) + clock_center_x, (26 * cos(pi)) + clock_center_y, 6, SSD1306_BLACK);
  display.fillCircle(26 * sin(pi) + clock_center_x, (26 * cos(pi)) + clock_center_y, 5, SSD1306_BLACK);
  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.setCursor(clock_center_x - 3, 0);          // Start at top-left corner
  display.println(F("12"));
}

void redraw_clock_face_elements(void) {
  display.drawCircle(clock_center_x, clock_center_y, 3, SSD1306_WHITE);
  display.fillCircle(clock_center_x, clock_center_y, 3, SSD1306_WHITE);
  display.setCursor(clock_center_x - 3, 0);
  display.println(F("12"));
}

void loop() {
  DateTime RTC = rtc.now();
  if (RTC.second() != second) {
    draw_second(second, 0);
    draw_minute(minute, 0);
    draw_hour(hour, minute, 0);
    draw_second(RTC.second(), 1);
    draw_minute(RTC.minute(), 1);
    draw_hour(RTC.hour(), RTC.minute(), 1);
    display.display();
    antiDigiClock(second, minute, hour);

    redraw_clock_face_elements();

    second = RTC.second();
    minute = RTC.minute();
    hour = RTC.hour();

    digiClock(second, minute, hour);

    redraw_clock_face_elements();
    display.display();
  }
}

void digiClock(int second, int minute, int hour) {
  int x = 72;
  int y = 10;

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(WHITE);
  display.setCursor(x, y);
  display.println(hour);
  // display.display();      // Show initial text

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(WHITE);
  display.setCursor(x + 14, y);
  display.println(":");
  //display.display();      // Show initial text

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(WHITE);
  display.setCursor(x + 20, y);
  display.println(minute);
  // display.display();

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(WHITE);
  display.setCursor(x + 34, y);
  display.println(":");
  //display.display();      // Show initial text


  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(WHITE);
  display.setCursor(x + 40, y);
  display.println(second);
  //display.display();


}

void antiDigiClock(int second, int minute, int hour) {
  int x = 72;
  int y = 10;

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(BLACK);
  display.setCursor(x, y);
  display.println(hour);
  // display.display();      // Show initial text

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(BLACK);
  display.setCursor(x + 14, y);
  display.println(":");
  //display.display();      // Show initial text

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(BLACK);
  display.setCursor(x + 20, y);
  display.println(minute);
  // display.display();

  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(BLACK);
  display.setCursor(x + 34, y);
  display.println(":");
  //display.display();      // Show initial text


  //display.clearDisplay();
  display.setTextSize(1); // Draw 2X-scale text
  display.setTextColor(BLACK);
  display.setCursor(x + 40, y);
  display.println(second);
  //display.display();


}


void stopWatch(int second, int minute, int hour, int mode) {
  int x = 8;
  int y = 35;
  if (mode == 0) {
    //display.clearDisplay();
    mode = BLACK; /// to erase previous time
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x, y);
    display.println(hour);
    // display.display();      // Show initial text

    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 14, y);
    display.println(":");
    //display.display();      // Show initial text

    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 20, y);
    display.println(minute);
    // display.display();

    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 34, y);
    display.println(":");
    //display.display();      // Show initial text


    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 40, y);
    display.println(second);
    //display.display();
  }
  if (mode == 1) {
    //display.clearDisplay();
    mode = WHITE; /// to display current time
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x, y);
    display.println(hour);
    // display.display();      // Show initial text

    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 14, y);
    display.println(":");
    //display.display();      // Show initial text

    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 20, y);
    display.println(minute);
    // display.display();

    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 34, y);
    display.println(":");
    //display.display();      // Show initial text


    //display.clearDisplay();
    display.setTextSize(2); // Draw 2X-scale text
    display.setTextColor(mode);
    display.setCursor(x + 40, y);
    display.println(second);
    //display.display();
  }
}




//interrupt///////////////////////////////////////////
ISR(TIMER1_OVF_vect) {
  ms_ctr = ms_ctr + 1;
  if (ms_ctr == 154) // 1000ms
  {
    ms_ctr = 0; //reset ms counter
    sec_ctr = sec_ctr + 1; //increment second counter
    Serial.print(sec_ctr);
  }
  if (sec_ctr == 60)
  {
    sec_ctr = 0; //reset sec counter
    min_ctr = min_ctr + 1; //increment min counter
  }
  //Update hour counter
  if (min_ctr == 60)
  {
    min_ctr = 0; //reset min counter
    hr_ctr = hr_ctr + 1; //increment hr counter
  }
  //Update day counter
  if (hr_ctr == 24)
  {
    hr_ctr = 0; //reset hr counter
    day_ctr = day_ctr + 1; //increment day counter
  }
}

void init_timer1_ovf_interrupt(void) {
  TCCR1B = 0x04; //divide timer1 timebase by 256, overfl. occurs every 4.1 ms
  TIMSK1 = 0x01; //enable timer1 overflow interrupt
  // asm("SEI"); //enable global interrupt
  sei();
}

void stopWatch_start(){
  Serial.print("R");                                                                                                                                       
  stopWatchStart();
}

void stopWatchStart(void){
  rtc.adjust(DateTime(0,0, 0, 0, 0, 0));
  Serial.println("yyyy");
   
  int a=1;
  while(a!=0){
    Serial.println("XXXX");
    
  }

}