/* 
 Adapted from sutaburosu's AA_lines.ino code. Many thanks!
*/

#include <FastLED.h>

#define WIDTH 64
#define HEIGHT 26
#define NUM_LEDS (WIDTH * HEIGHT)

CRGB leds[NUM_LEDS + 1];

void setup() 
{
  FastLED.addLeds<NEOPIXEL, 3>(leds, NUM_LEDS);
  Serial.begin(115200);
  // Serial.print(sizeof(CRGB));
}

// This is probably not good programming, idk.
#define ENABLE_CROSSFADE true
#define DISABLE_CROSSFADE false
#define ANIM_FOREGROUND true
#define ANIM_BACKGROUND false

void loop()
{
  int tslider = analogRead(A0);
  int rslider = analogRead(A1);
  int lslider = analogRead(A2);
  int32_t mappedTSlider = map(tslider,0,1024,-16384,16384);
  float mappedRSlider = fmap(rslider,0,1024,-8.0,8.0);
  int mappedLSlider = map(lslider,0,1024,0,20);

  sup(0.0,mappedTSlider,mappedLSlider,RainbowColors_p, LINEARBLEND,ANIM_BACKGROUND,DISABLE_CROSSFADE);
  FastLED.show();
}

uint16_t XY(uint8_t x, uint8_t y) {
  if (x >= WIDTH) return NUM_LEDS;
  if (y >= HEIGHT) return NUM_LEDS;
  return y * WIDTH + x;
}

void crossfade(CRGB *a, const CRGB *b, uint8_t amount) {
  uint8_t rev = 255 - amount;
  a->red   = (a->red   * amount + b->red   * rev) >> 8;
  a->green = (a->green * amount + b->green * rev) >> 8;
  a->blue  = (a->blue  * amount + b->blue  * rev) >> 8;
}

void qaddColors(CRGB *a, const CRGB *b) {
  a->red   = qadd8(a->red,b->red);
  a->green = qadd8(a->green,b->green);
  a->blue  = qadd8(a->blue,b->blue);
}

void sup(float rotationSpeed, int32_t translationSpeed, uint8_t lineWidth, CRGBPalette16 palette, TBlendType blendType, boolean foreground, boolean enableCrossfade) {
  static boolean firstTimeZero = false;
  static uint32_t lastMark = millis();
  static uint8_t lastIndex4bit = 15;
  // static uint32_t lastMillis = 32767/2; // int16_t 32767/2  (for rotationspeed=0 test)

  uint32_t xHueDelta = (int32_t)cos16(32767) * lineWidth;
  // uint32_t yHueDelta = (int32_t)sin16(lastMillis) * lineWidth;

  for (byte y = 0; y < HEIGHT; y++) {
    uint32_t lineStartHue = beat16(30) ;
    uint32_t pixelHue = lineStartHue << 7;

    uint8_t index_4bit = lineStartHue >> 12;
    // 60,000ms / 428.57 ms per beat/quarter note = 140 BPM 
    if( index_4bit == 0 && firstTimeZero ) {
      uint16_t difference =  millis() - lastMark;
      Serial.print(difference);
      Serial.print("ms   ");
      Serial.print(60000/difference);
      Serial.print(" bpm ");
      Serial.println();
      CRGB lineColor = ColorFromPaletteExtended(palette, pixelHue >> 7, 255, blendType);
      Serial.print(" red: ");
      Serial.print(lineColor.red);
      Serial.print(" green: ");
      Serial.print(lineColor.green);
      Serial.print(" blue: ");
      Serial.print(lineColor.blue);
      Serial.println();

      // lastIndex4bit = index_4bit;
      lastMark = millis();
      firstTimeZero = false;
      delay(500);
    }
    else if( index_4bit != 0 ) {
      firstTimeZero = true; // reset flag
    }

    for (byte x = 0; x < WIDTH; x++) {
      // leds[XY(x, y)] = ColorFromPalette(palette, pixelHue >> 15, 255, blendType);
      leds[XY(x, y)] = ColorFromPaletteExtended(palette, pixelHue >> 7, 255, blendType);
      pixelHue += xHueDelta;
    }
  }
}


// from: https://github.com/FastLED/FastLED/pull/202
CRGB ColorFromPaletteExtended(const CRGBPalette16& pal, uint16_t index, uint8_t brightness, TBlendType blendType) {
  // Extract the four most significant bits of the index as a palette index.
  uint8_t index_4bit = (index >> 12);
  // Calculate the 8-bit offset from the palette index.
  uint8_t offset = (uint8_t)(index >> 4);
  // Get the palette entry from the 4-bit index
  const CRGB* entry = &(pal[0]) + index_4bit;
  uint8_t red1   = entry->red;
  uint8_t green1 = entry->green;
  uint8_t blue1  = entry->blue;

  uint8_t blend = offset && (blendType != NOBLEND);
  if (blend) {
    if (index_4bit == 15) {
      entry = &(pal[0]);
    } else {
      entry++;
    }

    // Calculate the scaling factor and scaled values for the lower palette value.
    uint8_t f1 = 255 - offset;
    red1   = scale8_LEAVING_R1_DIRTY(red1,   f1);
    green1 = scale8_LEAVING_R1_DIRTY(green1, f1);
    blue1  = scale8_LEAVING_R1_DIRTY(blue1,  f1);

    // Calculate the scaled values for the neighbouring palette value.
    uint8_t red2   = entry->red;
    uint8_t green2 = entry->green;
    uint8_t blue2  = entry->blue;
    red2   = scale8_LEAVING_R1_DIRTY(red2,   offset);
    green2 = scale8_LEAVING_R1_DIRTY(green2, offset);
    blue2  = scale8_LEAVING_R1_DIRTY(blue2,  offset);
    cleanup_R1();

    // These sums can't overflow, so no qadd8 needed.
    red1   += red2;
    green1 += green2;
    blue1  += blue2;
  }
  if (brightness != 255) {
    // nscale8x3_video(red1, green1, blue1, brightness);
    nscale8x3(red1, green1, blue1, brightness);
  }
  return CRGB(red1, green1, blue1);
}

float fmap(float x, float a, float b, float c, float d)
{
      float f=x/(b-a)*(d-c)+c;
      return f;
}

String uint64ToString(uint64_t input) {
  String result = "";
  uint8_t base = 10;

  do {
    char c = input % base;
    input /= base;

    if (c < 10)
      c +='0';
    else
      c += 'A' - 10;
    result = c + result;
  } while (input);
  return result;
}