#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

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

  if(!display.begin(SSD1306_PAGEADDR, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.display();
  delay(2000);
  display.clearDisplay();
}

void drawClock() {
  display.clearDisplay();

  int16_t x0 = SCREEN_WIDTH / 2;
  int16_t y0 = SCREEN_HEIGHT / 2;
  int16_t radius = SCREEN_HEIGHT / 2 - 2;

  // Draw clock face
  display.drawCircle(x0, y0, radius, WHITE);

  // Draw clock ticks
  for (int i = 0; i < 12; ++i) {
    float angle = i * (PI / 6);
    int16_t x1 = x0 + int(cos(angle) * radius * 0.8);
    int16_t y1 = y0 + int(sin(angle) * radius * 0.8);
    int16_t x2 = x0 + int(cos(angle) * radius);
    int16_t y2 = y0 + int(sin(angle) * radius);

    display.drawLine(x1, y1, x2, y2, WHITE);
  }

  // Get current time
  int hours = 18;
  int minutes = 26;
  int seconds = 52;

  // Draw hour hand
  float hourAngle = PI / 2 - hours * (PI / 6) - minutes * (PI / 360);
  int16_t hourHandX = x0 + int(cos(hourAngle) * radius * 0.5);
  int16_t hourHandY = y0 - int(sin(hourAngle) * radius * 0.5);
  display.drawLine(x0, y0, hourHandX, hourHandY, WHITE);

  // Draw minute hand
  float minuteAngle = PI / 2 - minutes * (PI / 30) - seconds * (PI / 1800);
  int16_t minuteHandX = x0 + int(cos(minuteAngle) * radius * 0.8);
  int16_t minuteHandY = y0 - int(sin(minuteAngle) * radius * 0.8);
  display.drawLine(x0, y0, minuteHandX, minuteHandY, WHITE);

  // Draw second hand
  float secondAngle = PI / 2 - seconds * (PI / 30);
  int16_t secondHandX = x0 + int(cos(secondAngle) * radius * 0.9);
  int16_t secondHandY = y0 - int(sin(secondAngle) * radius * 0.9);
  display.drawLine(x0, y0, secondHandX, secondHandY, WHITE);

  // Refresh display
  display.display();
}

void loop() {
  drawClock();
  delay(1000); // Update every second
}