#include <TFT_eSPI.h>
#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
/***********************************
You can also use the VSPI port of the ESP32 to connect the TFT SPI pins. The pinout is as follows2:
TFT Pin	ESP32 Pin
MOSI	23
SCK	18
CS	15
RST	4
DC	2


**************************************/
TFT_eSPI tft = TFT_eSPI();

#define TFT_CS   15  // Chip select pin
#define TFT_DC   4  // Data/command pin
#define TFT_RST  2  // Reset pin

#define CLOCK_RADIUS 100
#define CLOCK_CENTER_X 160
#define CLOCK_CENTER_Y 120

#define HOUR_HAND_LENGTH 50
#define HOUR_HAND_WIDTH 5
#define MINUTE_HAND_LENGTH 80
#define MINUTE_HAND_WIDTH 3
#define SECOND_HAND_LENGTH 90
#define SECOND_HAND_WIDTH 1

#define HOUR_ANGLE_OFFSET 270
#define MINUTE_ANGLE_OFFSET 270
#define SECOND_ANGLE_OFFSET 270

#define CLOCK_FONT_SIZE 2
#define CLOCK_FONT_COLOR TFT_WHITE

const char* ssid = "Airtel_arvi_6035";
const char* password = "air26289";

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 19800);  // 19800 seconds is UTC+5:30

int old_hour_x, old_hour_y, old_minute_x, old_minute_y, old_second_x, old_second_y;

void setup() {
  tft.init();
  tft.setRotation(0);
  tft.fillScreen(TFT_BLACK);
  tft.setTextSize(CLOCK_FONT_SIZE);

  drawClockFace();

  connectToWiFi();
  updateTime();

  old_hour_x = CLOCK_CENTER_X;
  old_hour_y = CLOCK_CENTER_Y - HOUR_HAND_LENGTH;
  old_minute_x = CLOCK_CENTER_X;
  old_minute_y = CLOCK_CENTER_Y - MINUTE_HAND_LENGTH;
  old_second_x = CLOCK_CENTER_X;
  old_second_y = CLOCK_CENTER_Y - SECOND_HAND_LENGTH;
}

void loop() {
  timeClient.update();
  updateClockHands();
  delay(1000);
}

void drawClockFace() {
  tft.drawCircle(CLOCK_CENTER_X, CLOCK_CENTER_Y, CLOCK_RADIUS, TFT_WHITE);

  for (int i = 1; i <= 12; i++) {
    float angle = i * 30 * PI / 180;
    int x = CLOCK_CENTER_X + (CLOCK_RADIUS - 10) * cos(angle);
    int y = CLOCK_CENTER_Y + (CLOCK_RADIUS - 10) * sin(angle);

    tft.setTextColor(CLOCK_FONT_COLOR);
    tft.setCursor(x - 5, y - 5);
    tft.print(i);
  }
}

void updateClockHands() {
  eraseClockHands();
  drawHourHand();
  drawMinuteHand();
  drawSecondHand();
}

void eraseClockHands() {
  tft.drawLine(CLOCK_CENTER_X, CLOCK_CENTER_Y, old_hour_x, old_hour_y, TFT_BLACK);
  tft.drawLine(CLOCK_CENTER_X, CLOCK_CENTER_Y, old_minute_x, old_minute_y, TFT_BLACK);
  tft.drawLine(CLOCK_CENTER_X, CLOCK_CENTER_Y, old_second_x, old_second_y, TFT_BLACK);
}

void drawHourHand() {
  float hour_angle = (timeClient.getHours() % 12 + timeClient.getMinutes() / 60.0) * 30 * PI / 180;
  hour_angle += HOUR_ANGLE_OFFSET * PI / 180;

  int hour_x = CLOCK_CENTER_X + HOUR_HAND_LENGTH * cos(hour_angle);
  int hour_y = CLOCK_CENTER_Y + HOUR_HAND_LENGTH * sin(hour_angle);

  tft.drawLine(CLOCK_CENTER_X, CLOCK_CENTER_Y, hour_x, hour_y, TFT_YELLOW);
  old_hour_x = hour_x;
  old_hour_y = hour_y;
}

void drawMinuteHand() {
  float minute_angle = timeClient.getMinutes() * 6 * PI / 180;
  minute_angle += MINUTE_ANGLE_OFFSET * PI / 180;

  int minute_x = CLOCK_CENTER_X + MINUTE_HAND_LENGTH * cos(minute_angle);
  int minute_y = CLOCK_CENTER_Y + MINUTE_HAND_LENGTH * sin(minute_angle);

  tft.drawLine(CLOCK_CENTER_X, CLOCK_CENTER_Y, minute_x, minute_y, TFT_CYAN);
  old_minute_x = minute_x;
  old_minute_y = minute_y;
}

void drawSecondHand() {
  float second_angle = timeClient.getSeconds() * 6 * PI / 180;
  second_angle += SECOND_ANGLE_OFFSET * PI / 180;

  int second_x = CLOCK_CENTER_X + SECOND_HAND_LENGTH * cos(second_angle);
  int second_y = CLOCK_CENTER_Y + SECOND_HAND_LENGTH * sin(second_angle);

  tft.drawLine(CLOCK_CENTER_X, CLOCK_CENTER_Y, second_x, second_y, TFT_RED);
  old_second_x = second_x;
  old_second_y = second_y;
}

void connectToWiFi() {
  Serial.begin(115200);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void updateTime() {
  timeClient.begin();
  timeClient.setTimeOffset(0);
}