#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>

// LCD pin connections (matches your circuit)
Adafruit_PCD8544 display = Adafruit_PCD8544(7, 6, 5, 4, 3);

// Time variables (start time)
int h = 12;   // Hour
int m = 15;   // Minute
int s = 0;    // Second

// Center of clock face
const int cx = 42;   // X center
const int cy = 24;   // Y center
const int radius = 20;

void setup() {
  display.begin();
  display.setContrast(50);
  display.clearDisplay();
  display.display();
}

void loop() {
  // Clear screen
  display.clearDisplay();

  // Draw clock circle
  display.drawCircle(cx, cy, radius, BLACK);

  // Draw tick marks (12 hours)
  for (int i = 0; i < 12; i++) {
    float angle = i * 30 * PI / 180; // 30° per hour
    int x1 = cx + cos(angle) * (radius - 2);
    int y1 = cy + sin(angle) * (radius - 2);
    int x2 = cx + cos(angle) * radius;
    int y2 = cy + sin(angle) * radius;
    display.drawLine(x1, y1, x2, y2, BLACK);
  }

  // Calculate hand angles
  float secAngle = s * 6 * PI / 180;              // 6° per second
  float minAngle = (m + s / 60.0) * 6 * PI / 180; // 6° per minute
  float hourAngle = (h % 12 + m / 60.0) * 30 * PI / 180; // 30° per hour

  // Second hand
  int sx = cx + cos(secAngle) * (radius - 2);
  int sy = cy + sin(secAngle) * (radius - 2);
  display.drawLine(cx, cy, sx, sy, BLACK);

  // Minute hand
  int mx = cx + cos(minAngle) * (radius - 5);
  int my = cy + sin(minAngle) * (radius - 5);
  display.drawLine(cx, cy, mx, my, BLACK);

  // Hour hand
  int hx = cx + cos(hourAngle) * (radius - 10);
  int hy = cy + sin(hourAngle) * (radius - 10);
  display.drawLine(cx, cy, hx, hy, BLACK);

  // Signature
  display.setCursor(0, 40);
  display.setTextSize(1);
  display.print("arvind");

  // Push to LCD
  display.display();

  // Delay 1 second
  delay(1000);

  // Update time
  s++;
  if (s == 60) {
    s = 0;
    m++;
  }
  if (m == 60) {
    m = 0;
    h++;
  }
  if (h == 13) {
    h = 1;
  }
}