/**
 * Maps potentiometer input to the onboard NeoPixel's hue.
 * Turn the knob to sweep through the full rainbow!
 *
 * Requires the Adafruit NeoPixel library:
 *   Sketch -> Include Library -> Manage Libraries -> search "Adafruit NeoPixel"
 *
 * See: https://makeabilitylab.github.io/physcomp/esp32/pot-fade
 */
#include <Adafruit_NeoPixel.h>

// On the Wokwi generic ESP32-S3 DevKit, the NeoPixel is on GPIO 38
const int WOKWI_NEOPIXEL_PIN = 38;

Adafruit_NeoPixel _pixel(1, WOKWI_NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800);

const int POT_INPUT_PIN = 4;           

#if defined(ESP32)
  const int MAX_ANALOG_VAL = 4095;
#else
  const int MAX_ANALOG_VAL = 1023;
#endif

const uint32_t MAX_HUE = 65536;          // Full color wheel in 16-bit hue

void setup() {
  #if defined(NEOPIXEL_POWER)
    pinMode(NEOPIXEL_POWER, OUTPUT);
    digitalWrite(NEOPIXEL_POWER, HIGH);
  #endif

  _pixel.begin();
  _pixel.setBrightness(30);  // Keep it gentle on the eyes
  _pixel.show();

  Serial.begin(115200);
}

void loop() {
  // Read the potentiometer (0-4095 on ESP32)
  int potVal = analogRead(POT_INPUT_PIN);

  // Map to the full hue range (0-65535)
  uint32_t hue = map(potVal, 0, MAX_ANALOG_VAL, 0, MAX_HUE - 1);

  // Apply the hue with full saturation and brightness, plus gamma correction
  uint32_t color = _pixel.gamma32(_pixel.ColorHSV(hue, 255, 255));
  _pixel.setPixelColor(0, color);
  _pixel.show();

  Serial.print("Pot:");
  Serial.print(potVal);
  Serial.print(", Hue:");
  Serial.println(hue);

  delay(20);
}