#include <FastLED.h>
#include <OneButton.h>

#define NUM_LEDS  16
#define LED_PIN   0
#define buttonPin 5 // Push Button
#define relayPin 2
 
// Rotary Encoder Inputs
#define inputCLK 4
#define inputDT 3
#define SW_Pin 1 // Encoder Switch

int brightLevel = 100; // Default Brightness
int currentStateCLK;
int previousStateCLK;

bool pressed = false;
bool wasPressed = false;
bool relayToggle = true;

CRGB leds[NUM_LEDS];

uint8_t colorChange = 0;

OneButton btn = OneButton(buttonPin, true, true); // Push Button

OneButton SW = OneButton(SW_Pin, true, true); // Encoder Switch

void setup() {
  pinMode(inputCLK, INPUT);
  pinMode(inputDT, INPUT);

  pinMode(relayPin, OUTPUT);
 
  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS);
  
  previousStateCLK = digitalRead(inputCLK);

  btn.attachClick(nextColor);
}

void loop() {
  latch();
  currentStateCLK = digitalRead(inputCLK);     
   if (currentStateCLK != previousStateCLK){         
     if (digitalRead(inputDT) != currentStateCLK) { 
       // Ecoder is Rotating Counterclockwise
       brightLevel --;
       if (brightLevel<12){
        brightLevel = 12; // Min Brightness
       }     
     } else {
       // Encoder is Rotating Clockwise
       brightLevel ++;
       if (brightLevel>150){
        brightLevel = 150; // Max Brightness
       }      
     }     
   }    
   previousStateCLK = currentStateCLK;
  
 FastLED.setBrightness(brightLevel);
  
 switch (colorChange) {
    case 0:
      red();
      break;
    case 1:
      green();
      break;
    case 2:
      blue();
      break;
    case 3:
      orange();
      break;
    case 4:
      yellow();
      break;
    case 5:
      violet();
      break;
    case 6:
      pink();
      break;
    case 7:
      white();
      break;
    case 8:
      cyan();
      break;        
  }
  FastLED.show();
  btn.tick();
}

void nextColor() {
  colorChange = (colorChange + 1) % 9;           
}

// ****** Colors ******
void red(){
  fill_solid(leds,NUM_LEDS,CRGB::Red);
}

void green() { 
  fill_solid(leds, NUM_LEDS, CRGB::Green);
}

void blue() { 
  fill_solid(leds, NUM_LEDS, CRGB::Blue);
}

void orange(){
  fill_solid(leds,NUM_LEDS,CRGB::DarkOrange);
}

void yellow() { 
  fill_solid(leds, NUM_LEDS, CRGB::Yellow);
}

void violet() { 
  fill_solid(leds, NUM_LEDS, CRGB::DarkViolet);
}

void pink() { 
  fill_solid(leds, NUM_LEDS, CRGB::DeepPink);
}

void white() { 
  fill_solid(leds, NUM_LEDS, CRGB::White);
}

void cyan() { 
  fill_solid(leds, NUM_LEDS, CRGB::Cyan);
}

void latch(){
  wasPressed = pressed;
  pressed = digitalRead(SW_Pin);

  if (pressed & !wasPressed){
    relayToggle = !relayToggle;
  }
  digitalWrite(relayPin, relayToggle);
}