#include <RTClib.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

#define TFT_DC 9
#define TFT_CS 10
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
double s = 0;
int m = 0, h = 0;
RTC_DS1307 rtc;
int tx1, tx2, tx3, ty1, ty2, ty3;
int x1, x2, x3, y1, y2, y3;
int tmp;
int last_sec;

void setup() {
  Serial.begin(9600);
  tft.begin();
  rtc.begin();
  last_sec = rtc.now().second();
  while (last_sec == rtc.now().second()) {
    last_sec = rtc.now().second();
  }
  tmp = millis();
}

void loop() {
  DateTime now = rtc.now();
  if (last_sec < now.second()) {
    tmp = millis();
  }
  s = now.second() + max(0, min(1, (millis() - tmp) / 1000.0)), 
  m = now.minute(), h = now.hour();
  last_sec = s;
  if (millis() - tmp >= 1000) {
    tmp = millis();
  }

  tft.drawCircle(120, 160, 110, ILI9341_WHITE);
  for (int i = 0; i < 360; i += 6) {
    double radian = (i * PI) / 180;
    int s_x = 120 + cos(radian) * (105 - !(i % 30) * 7);
    int s_y = 160 + sin(radian) * (105 - !(i % 30) * 7);
    int e_x = 120 + cos(radian) * 110;
    int e_y = 160 + sin(radian) * 110;
    tft.drawLine(s_x, s_y, e_x, e_y, ILI9341_WHITE);
  }
  tft.drawLine(120, 160, tx1, ty1, ILI9341_BLACK);
  tft.drawLine(120, 160, tx2, ty2, ILI9341_BLACK);
  tft.drawLine(120, 160, tx3, ty3, ILI9341_BLACK);
  double radian = radians(s * 6 - 90);
  double x = 120 + cos(radian) * 80;
  double y = 160 + sin(radian) * 80;
  tft.drawLine(120, 160, x, y, ILI9341_RED);
  x1 = x, y1 = y;
  radian = radians(m * 6 + (s * 6 / 60.0) - 90);
  x = 120 + cos(radian) * 105;
  y = 160 + sin(radian) * 105;
  tft.drawLine(120, 160, x, y, ILI9341_WHITE);
  x2 = x, y2 = y;
  radian = radians(h * 30 + (m * 30 / 60.0) - 90);
  x = 120 + cos(radian) * 75;
  y = 160 + sin(radian) * 75;
  tft.drawLine(120, 160, x, y, ILI9341_WHITE);
  x3 = x, y3 = y;
  tft.fillCircle(120, 160, 3, ILI9341_WHITE);
  tx1 = x1;
  tx2 = x2;
  tx3 = x3;
  ty1 = y1;
  ty2 = y2;
  ty3 = y3;
  // delay(10);
}