#include <Adafruit_NeoPixel.h>

#define PIN_NEO_PIXEL 16 // The ESP32 pin GPIO16 connected to NeoPixel
#define NUM_PIXELS 200    // The number of LEDs (pixels) on NeoPixel LED strip

Adafruit_NeoPixel neopixel(NUM_PIXELS, PIN_NEO_PIXEL, NEO_GRB + NEO_KHZ800);

struct RGB
{
  int red = 0;
  int green = 0;
  int blue = 0;
};

class LedStrip
{
public:
  RGB stripColor[NUM_PIXELS];

  int framerate = 60;

  void frameDelay() {
    static unsigned long lastFrame = millis();
    int wantedDelay = 1000/framerate;
    while (lastFrame < millis() - wantedDelay) {
      delay(1);
    }
    lastFrame = millis();
  }

  void show()
  {
    for (int pixel = 0; pixel < NUM_PIXELS; ++pixel)
    {
      int color = neopixel.Color(stripColor[pixel].red, stripColor[pixel].green, stripColor[pixel].blue);
      neopixel.setPixelColor(pixel, color);
    }
    neopixel.show();
    //frameDelay();
  }

  void clearStrip()
  {
    for (int pixel = 0; pixel < NUM_PIXELS; pixel++)
    {
      stripColor[pixel].red = 0;
      stripColor[pixel].green = 0;
      stripColor[pixel].blue = 0;
    }
  }

  void setPixelColor(int pixel, int r, int g, int b)
  {
    stripColor[pixel].red = r;
    stripColor[pixel].green = g;
    stripColor[pixel].blue = b;
  }

  void setColor(int r, int g, int b)
  {
    for (int pixel = 0; pixel < NUM_PIXELS; pixel++)
    {
      setPixelColor(pixel, r, g, b);
    }
  }

  int fadeColor(int curColor, int targetColor, int fadeSpeed) 
    {
      
      int newColor = curColor;
      if (curColor < targetColor) {
        newColor += fadeSpeed;
        if (newColor > targetColor) {
          newColor = targetColor;
        }
      }
      else if (curColor > targetColor) {
        newColor -= fadeSpeed;
        if (newColor < targetColor) {
          newColor = targetColor;
        }
      }
      return newColor;
    }

  bool fadeStrip(int r, int g, int b, int speed=10)
  {
    static unsigned long lastFrame = millis();

    unsigned long sinceLastFrameMS = millis() - lastFrame;
    unsigned int fadeSpeed = ((speed) * sinceLastFrameMS) * 0.2;
    //Serial.println(fadeSpeed);

    if (fadeSpeed > 1000) {
      fadeSpeed = 1000;
    }

    fadeSpeed = map(fadeSpeed, 0, 1000, 0, 255);
    if (fadeSpeed) {
      lastFrame = millis();
    }
    Serial.println(fadeSpeed);
    
    bool returnVal = true;
    for (int pixel = 0; pixel < NUM_PIXELS; pixel++)
    {
      stripColor[pixel].red = fadeColor(stripColor[pixel].red, r, fadeSpeed);
      stripColor[pixel].green = fadeColor(stripColor[pixel].green, g, fadeSpeed);
      stripColor[pixel].blue = fadeColor(stripColor[pixel].blue, b, fadeSpeed);
      if (stripColor[pixel].red != r || stripColor[pixel].green != g || stripColor[pixel].blue != b) {
        returnVal = false;
      }
    }
    
    return returnVal;
  }
};

LedStrip ledStrip;

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  neopixel.begin();
  neopixel.clear();
}

void loop()
{
  while (!ledStrip.fadeStrip(255,0,0)) {
    ledStrip.show();
  }
  while (!ledStrip.fadeStrip(0,255,0)) {
    ledStrip.show();
  }
  while (!ledStrip.fadeStrip(0,0,255)) {
    ledStrip.show();
  }
}