#include <FastLED.h>

// LED setup
#define LED_PIN 5
#define NUM_LEDS 150
#define ROWS 10
#define COLS 15

CRGB leds[NUM_LEDS];

// Map LEDs for column-major wiring (top to bottom)
int getLEDIndex(int row, int col) {
  return (col % 2 == 0) ? (row + col * ROWS) : ((ROWS - 1 - row) + col * ROWS);
}

// Draw Georgian flag
void drawGeorgianFlag(float waveOffset) {
  for (int col = 0; col < COLS; col++) {
    for (int row = 0; row < ROWS; row++) {
      int index = getLEDIndex(row, col);

      // Simulate wave effect
      float wave = sin((float)row / ROWS * 2.0 * PI + waveOffset);

      // Flag pattern: white background with red crosses
      if ((col == 7) || (row == 4 || row == 5)) {
        leds[index] = CHSV(0, 255, 255); // Red cross
      } else {
        leds[index] = CHSV(0, 0, 255); // White background
      }

      // Apply waving brightness effect
      leds[index].fadeLightBy(128 * (1 - wave));
    }
  }
  FastLED.show();
}

void setup() {
  FastLED.addLeds<WS2811, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.clear();
}

void loop() {
  static float waveOffset = 0.0;
  drawGeorgianFlag(waveOffset);
  waveOffset += 0.1; // Increase wave phase for animation
  delay(50);
}