#include <FastLED.h>

#define LED_PIN     6
#define NUM_LEDS    529   // 23 rows x 23 columns

CRGB leds[NUM_LEDS];

CRGB blueColor = CRGB(0, 0, 255);    // Blue color (R,G,B)
CRGB yellowColor = CRGB(255, 255, 0);    // Yellow color (R,G,B)

float time = 0.0;          // Keep track of time for animation
float speed = 0.01;        // Speed of wave animation
float scale = 5.0;         // Scale of wave animation
float amplitude = 20.0;    // Amplitude of wave animation
float period = 60.0;       // Period of wave animation

unsigned long previousMillis = 0;  // Keep track of the previous animation update time
unsigned long interval = 50;

float brightnessScale = 30.0;   // Scale of brightness variation
float brightnessOffset = 100.0; // Offset of brightness variation

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

void loop() {
  // Set every LED in the grid to blue or yellow based on row number
  for (int row = 0; row < 23; row++) {
    CRGB color = (row < 11) ? blueColor : yellowColor;
    for (int col = 0; col < 23; col++) {
      int index = row * 23 + col;
      leds[index] = color;
    }
  }

  // Add wind wave flag effect with brightness variation
  for (int y = 0; y < 23; y++) {
    float offset = sin((time - y * period) / period * 2 * PI) * amplitude;
    for (int x = 0; x < 23; x++) {
      int index = y * 23 + x;
      leds[index] = blend(leds[index], CRGB::Black, 64);   // Add a slight fade to the color
      float brightness = (inoise8(x / brightnessScale, (time - y * period) / period, 0.0) + 1.0) * 0.5 * 255.0 + brightnessOffset;   // Add the brightness variation using Perlin noise
      leds[index].nscale8_video(brightness);   // Scale the brightness of the color
      leds[index] = leds[index] + CRGB(offset, offset, 0);   // Add the wave effect
    }
  }

  FastLED.show();

  // Update time for animation based on elapsed time since the previous update
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    time += speed;
  }
}