#include <FastLED.h>

#define NUM_LEDS 64
#define DATA_PIN 3
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB

CRGB leds[NUM_LEDS];

// Define three colors to transition between
CHSV color1 = CHSV(0, 255, 255);   // Red
CHSV color2 = CHSV(96, 255, 255);  // Green
CHSV color3 = CHSV(200, 255, 255); // Blue

#define TRANSITION_TIME 5000  
unsigned long startTime;

void setup() {
  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setBrightness(150);
  startTime = millis();
}

void loop() {
  unsigned long elapsedTime = millis() - startTime;
  
  // Compute blend amount between three colors (corrected variable name)
  float blendFactor = fmod((float)elapsedTime / TRANSITION_TIME, 1.0);  
  int stage = (elapsedTime / TRANSITION_TIME) % 3;  // Determines which two colors to blend

  CHSV startColor, endColor;

  if (stage == 0) {
    startColor = color1;
    endColor = color2;
  } else if (stage == 1) {
    startColor = color2;
    endColor = color3;
  } else {
    startColor = color3;
    endColor = color1;
  }

  for (int i = 0; i < NUM_LEDS; i++) {
    float positionFactor = (float)i / NUM_LEDS;  // Determines how much of the strip is blended
    CHSV blendedColor = blend(startColor, endColor, positionFactor * blendFactor * 255);  
    leds[i] = blendedColor;
  }

  FastLED.show();
  delay(50);

  // Slowly rotate hues to keep colors evolving (fully written)
  EVERY_N_SECONDS(8) { 
    color1.hue += 10; 
    color2.hue += 10; 
    color3.hue += 10; 
  }
}