#include <Adafruit_NeoPixel.h>

// NeoPixel Variables...
#define PIXELPIN 21 
#define NUMPIXELS 8 
Adafruit_NeoPixel pixels(NUMPIXELS, PIXELPIN, NEO_GRB + NEO_KHZ800);

// Button Variables...
#define BUTTON A3
int buttonState;          
int lastButtonState = HIGH;

// Button Bounce Fix...
long bounceTime = 0; 
long bounceDelay = 50; 

// Setup Variables...
long resetTimer = 0;
int resetState = 0;  

// Anim Variables...
long animTimer = millis();
int animPixel = 0;  

// Global Variables...
int deviceMode = 0;

// Function to toggle device modes............................................

void changeMode()
{
 
  if (deviceMode != 1)
  {
    for (int i = 0; i < NUMPIXELS; i++) { 
      pixels.setPixelColor(i, pixels.Color(0,100,0));
    }  
    delay(50);
    pixels.show();
    deviceMode = 1;
    Serial.println("Mode 1"); 
  }
  else
  {
    for (int i = 0; i < NUMPIXELS; i++) { 
      pixels.setPixelColor(i, pixels.Color(0,0,100));
    }  
    delay(50);
    pixels.show();
    deviceMode = 2;
    Serial.println("Mode 2"); 
  }
  
}

// Function to put device in set-up mode............................................

void setupMode()
{
  if (deviceMode != 3) // enter set-up mode...
  {
        for (int i = 0; i < NUMPIXELS; i++) { 
      pixels.setPixelColor(i, pixels.Color(100,60,0));
    } 
    delay(50); 
    pixels.show();
    deviceMode = 3;
    Serial.println("Set-Up Mode"); 
  }
  else // exit set-up mode...
  {
     for (int i = 0; i < NUMPIXELS; i++) { 
      pixels.setPixelColor(i, pixels.Color(0,100,0));
    } 
    delay(50); 
    pixels.show();
    deviceMode = 0;
  }
 
}

// Function to Handle Pixel Patterns for Animations..................................

int pixelNo(int x)
  {
    if (x < 0)
    {
      x = (NUMPIXELS) + x;
    }
      
    if (x >= (NUMPIXELS))
    {
       x = (NUMPIXELS) - x;
    }         
    return x;
  }
  
// Animation Function.................................................................

void anim(){

  if (deviceMode == 3)
  {   
   if (millis() - animTimer > 120) {   
    animTimer += 120;
    pixels.clear(); // Needed Due to ESP32 Timing Issues
    for (int i = 0; i < NUMPIXELS; i++) { 
      pixels.setPixelColor(i, pixels.Color(2,0,0));
    }   
    pixels.setPixelColor(pixelNo(animPixel), pixels.Color(100,0,0));
    pixels.setPixelColor(pixelNo(animPixel - 1), pixels.Color(20,0,0));   
    delay(1); // Needed Due to ESP32 Timing Issues   
    pixels.show(); 
    animPixel += 1;
      if (animPixel >= NUMPIXELS)
      {
        animPixel = 0;
      }  
    }   
  }
}

//---------------------------------------------------------------------------------------------

void setup() {

  // Start Serial Interface...
  Serial.begin(115200);
  while(!Serial)
  Serial.println("Serial Started...");
  
  // Clear Pixels...
  pixels.begin();
  pixels.clear();
  pixels.show();
  pixels.show(); // Needed Due to ESP32 Timing Issues  
  Serial.println("Pixels Cleared...");
  delay(2000);

  // Set Pixels to Red...
  for (int i = 0; i < NUMPIXELS; i++) { 
    pixels.setPixelColor(i, pixels.Color(100,0,0));
  }  
  pixels.show();
  Serial.println("Pixels Red...");

  // Set Pin Mode for BUTTON...
  pinMode(BUTTON, INPUT);

  // Set up stuff here...
  delay(4000); // Used to simulate a delay...
  changeMode();

}
 
//---------------------------------------------------------------------------------------------

 void loop() {

  int reading = digitalRead(BUTTON);
 
  if (reading != lastButtonState) // If button state has changed previously...
  {
    bounceTime = millis();
  }

  if ((millis() - bounceTime) > bounceDelay) // If it's been [bounceDelay] since last button state change...
  {
    if (reading != buttonState) // If button state has changed again...
    {     
      buttonState = reading;      
      if (buttonState == LOW && deviceMode != 3) {     
         Serial.println("Button Up"); 
         changeMode();
      }
    }
  }
  
  if (reading == HIGH) {
      
      if (resetState == 0)
      {  
        resetTimer = millis();
      }
      
      resetState = 1;

        if ((millis() - resetTimer) > 5000) // If the button has been pressed for 5 seconds...
        {
          resetState = 0;
          resetTimer = 0;
          setupMode();     
        }        
    }
    else
    {
      resetState = 0;
      resetTimer = 0;
    }
  
  lastButtonState = reading;

  anim(); 
 
}

//---------------------------------------------------------------------------------------------