#include <Adafruit_NeoPixel.h>

// Which pin on the Arduino is connected to the NeoPixels?
#define ledPIN 6 

//Which pin is input for the switch
const int pinOFswitch = 8;

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 1 

//define the Mic/sound sensor on which analog pin
#define MIC A0

int a; //varibale to store analog read of sound sensor level

int ledBrightnessStrip = 0;  //declare and set to initial value of 0

// When setting up the NeoPixel library, we tell it how many pixels,
// and which pin to use to send signals. 
Adafruit_NeoPixel pixels(NUMPIXELS, ledPIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 1000 // Time (in milliseconds) to pause between color changes when sound sensor not used

float col[3];
float hue =0;
float fract(float x) { return x - int(x); }

float mix(float a, float b, float t) { return a + (b - a) * t; }

float* hsv2rgb(float h, float s, float b, float* rgb) 
{
  rgb[0] = b * mix(1.0, constrain(abs(fract(h + 1.0) * 6.0 - 3.0) - 1.0, 0.0, 1.0), s);
  rgb[1] = b * mix(1.0, constrain(abs(fract(h + 0.6666666) * 6.0 - 3.0) - 1.0, 0.0, 1.0), s);
  rgb[2] = b * mix(1.0, constrain(abs(fract(h + 0.3333333) * 6.0 - 3.0) - 1.0, 0.0, 1.0), s);
  return rgb;
}

//set color names
//pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255
uint32_t blue = pixels.Color(0, 0, 255);
uint32_t red = pixels.Color(255, 0, 0);
uint32_t purple = pixels.Color(255, 0, 255);
uint32_t yellow = pixels.Color(255, 255, 0);
uint32_t green = pixels.Color(0, 150, 0);
uint32_t cyan = pixels.Color(0, 200, 220);

//SETUP <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
void setup() 
{
  pixels.begin(); // INITIALIZE NeoPixel object (REQUIRED)

//Set pin mode of the switch to Pull Up
  pinMode(pinOFswitch, INPUT_PULLUP);

//setup the sound sensor
  Serial.begin(9600);
  delay(1000);

//set pinmode of the sound sensor to 'input'
  pinMode(MIC, INPUT);  
  
 // pixels.setPixelColor(0,   255,   0, 0);
 // pixels.setBrightness(100);  //turn the brightness down so it can brighten with sound volume
 // pixels.show();

}  
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


void loop() {
  pixels.clear(); // Set all pixel colors to 'off'
   
  int ValueOFswitch;  

  ValueOFswitch = digitalRead(pinOFswitch);

  if (ValueOFswitch == LOW) 
    {
      pixels.setBrightness(200); //if not using the sound sensor, make the LED brighter 

     // The first NeoPixel in a strand is #0, second is 1, all the way up
  // to the count of pixels minus one.
  for(int i=0; i<NUMPIXELS; i++) { // For each pixel...

    // Red:
    pixels.setPixelColor(i, red);
    pixels.show();   // Send the updated pixel colors to the hardware.
    delay(DELAYVAL);

    // Blue:
    pixels.setPixelColor(i, blue);
    pixels.show();   // Send the updated pixel colors to the hardware.
    delay(DELAYVAL);

    // Purple:
    pixels.setPixelColor(i, purple);
    pixels.show();   // Send the updated pixel colors to the hardware.
    delay(DELAYVAL);

    // Green:
    pixels.setPixelColor(i, green);
    pixels.show();   // Send the updated pixel colors to the hardware.
    delay(DELAYVAL);
   
    // Yellow:
    pixels.setPixelColor(i, yellow);
    pixels.show();   // Send the updated pixel colors to the hardware.
    delay(DELAYVAL);

    // Cyan:
    pixels.setPixelColor(i, cyan);
    pixels.show();   // Send the updated pixel colors to the hardware.
    delay(DELAYVAL);
  
    // Template to add another color
    // Color:
    //  pixels.setPixelColor(i, cyan);
    // pixels.show();   // Send the updated pixel colors to the hardware.
    // delay(DELAYVAL);
  }}

  else    //do this if the switch reads HIGH 
      {
        //pixels.clear(); // Set all pixel colors to 'off'
        //pixels.show();   // Send the updated pixel colors to the hardware.

//test mic input and writing out to logger
       //  int sample = analogRead(A0);
       // Serial.println(sample);
       // digitalWrite(13, abs(sample - 512) > 50);
       

//---This section is for the sound sensor------------------------------
      pixels.setPixelColor(0,   255,   0, 0);
      pixels.setBrightness(100);  //turn the brightness down so it can brighten with sound volume
      pixels.show();

      delay(10);
      a = analogRead(MIC);
      Serial.println(a);
      if (a > 500) {

      ledBrightnessStrip=255;
      } 

      ledBrightnessStrip=ledBrightnessStrip*0.95;

     if (ledBrightnessStrip<0) {
      ledBrightnessStrip=0;
     }
  
      hue += 0.0005;
      if (hue >= 1.0) hue = 0.0;

  
      hsv2rgb(hue, 1.0, 1.0, col);
  
      pixels.setBrightness(ledBrightnessStrip);  
      pixels.setPixelColor(0,   (int)(col[0]*255), (int)(col[1]*255), (int)(col[2]*255));
      pixels.show();
     
// ---------------------------------------------------------------------
 }

  }