#include "Arduino.h"
#include <FastLED.h>
#define LED_PIN 1 //LED Strip Signal Connection
#define buttonPin 0 //Push Button Pin

#define NUM_LEDS 16 //Total no of LEDs in the LED strip. You can safely go upto 80 LEDs.

CRGB leds[NUM_LEDS];

int r, g, b;
int ColourTrig;
int LEDPower = 0;
int numb=1;
int pres=0;

int SPEED_KITT2 = 40; //Pattern2 Speed. Lower this value to increase the speed.
int SPEED_KITT3 = 25; //Pattern3 Speed. Lower this value to increase the speed.


void setup() 
{
FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
FastLED.clear();
pinMode(buttonPin, INPUT_PULLUP);
}

void loop() 
{
ButtonScan();

switch (numb) {
  case 1:
    Pattern1(1); //You can change LED colour in "X", Pattern1(X) X = 1-Red, 2-Magenta, 3-Blue, 4-Cyan, 5-Green, 6-Yellow, 7- White
    break;
  case 2:
    Pattern1(2);
    break;
  case 3:
    Pattern1(3);
    break;
  case 4:
    Pattern1(4);
    break;
  case 5:
    Pattern1(5);
    break;
  case 6:
    Pattern1(6);
    break;
  case 7:
    Pattern1(7);
    break;
  case 8:
    Pattern2(1);
    break;
  case 9:
    Pattern2(2);
    break;
  case 10:
    Pattern2(3);
    break;
  case 11:
    Pattern2(4);
    break;
  case 12:
    Pattern2(5);
    break;
  case 13:
    Pattern2(6);
    break;
  case 14:
    Pattern2(7);
    break;
  case 15:
    Pattern3(1);
    break;
  case 16:
    Pattern3(2);
    break;
  case 17:
    Pattern3(3);
    break;
  case 18:
    Pattern3(4);
    break;
  case 19:
    Pattern3(5);
    break;
  case 20:
    Pattern3(6);
    break;
  case 21:
    Pattern3(7);
    break;
  default:
    break;
}
}

void Pattern3(int ColourTrig)
{
switch (ColourTrig) 
 {
  case 1:
  r = 255;
  g = b = 0;
  break;
  
  case 2:
  r = b = 255;
  g = 0;
  break;
  
  case 3:
  b = 255;
  r = g = 0;
  break; 

  case 4:
  b = g = 255;
  r = 0;
  break; 

  case 5:
  g = 255;
  r = b = 0;
  break; 

  case 6:
  r = g = 255;
  b = 0;
  break; 

  case 7:
  r = g = b = 255;
  break;
} 

  for (int i = 0; i < (NUM_LEDS/2); i++)
  {
  leds[(NUM_LEDS/2)+i] = CRGB(r, g, b);
  leds[((NUM_LEDS/2)-1)-i] = CRGB(r, g, b);
  FastLED.show();ButtonScan();
  delay (SPEED_KITT3);  
  }
  for (int i = 0; i < (NUM_LEDS/2); i++)
  {
  leds[(NUM_LEDS/2)+i] = CRGB(0, 0, 0);
  leds[((NUM_LEDS/2)-1)-i] = CRGB(0, 0, 0);
  FastLED.show();ButtonScan();
  delay (SPEED_KITT3); 
  }
  delay (150); 
}


void Pattern2(int ColourTrig)
{
switch (ColourTrig) 
 {
  case 1:
  r = 255;
  g = b = 0;
  break;
  
  case 2:
  r = b = 255;
  g = 0;
  break;
  
  case 3:
  b = 255;
  r = g = 0;
  break; 

  case 4:
  b = g = 255;
  r = 0;
  break; 

  case 5:
  g = 255;
  r = b = 0;
  break; 

  case 6:
  r = g = 255;
  b = 0;
  break; 

  case 7:
  r = g = b = 255;
  break;
} 

fadeToBlackBy(leds, NUM_LEDS, 4);
uint8_t u = beat8(SPEED_KITT2, 0);
uint8_t pos1 = map(u, 255, 0, 0, NUM_LEDS);
leds[pos1] = CRGB(r, g, b);
uint8_t pos2 = map(u, 0, 255, 0, NUM_LEDS);
leds[pos2] = CRGB(r, g, b);  
FastLED.show();ButtonScan();
}


void Pattern1(int ColourTrig)
{
switch (ColourTrig) 
 {
  case 1:
  r = 255;
  g = b = 0;
  break;
  
  case 2:
  r = b = 255;
  g = 0;
  break;
  
  case 3:
  b = 255;
  r = g = 0;
  break; 

  case 4:
  b = g = 255;
  r = 0;
  break; 

  case 5:
  g = 255;
  r = b = 0;
  break; 

  case 6:
  r = g = 255;
  b = 0;
  break; 

  case 7:
  r = g = b = 255;
  break;
} 

fadeToBlackBy(leds, NUM_LEDS, 20);
int pos = beatsin16(20, 0, NUM_LEDS-1);
leds[pos] += CRGB(r, g, b);
FastLED.show();ButtonScan();  
FastLED.delay(5); 
}




void ButtonScan()
{
if(digitalRead(buttonPin)==0)
   {
    if(pres==0)
   {
    numb++;
    pres=1;
   }
    }
  else
  {
    pres=0;
   }  

 if(numb == 22)
 {
 numb = 1;
 }
}