#include <Adafruit_NeoPixel.h>
#define PIN 2  
#define NUMPIXELS 43 
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int RGB = 0;
int RGB_t = 0;
int RGB_r = 0;
int RGB_g = 0;
int RGB_b = 0;
int RGB_L = 0;
int color = 0;
int i = 0 ;

void setup() {
  pixels.begin(); 
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(A0, INPUT_PULLUP);

}

void loop() {
  if(digitalRead(4) == 0 && digitalRead(5) == 1) {
    if (analogRead(A0) < 750 ) {color_0();}
    if (analogRead(A0) >= 750 ) {color_1();}}
  if(digitalRead(5) == 0 && digitalRead(4) == 1) {color_2();}
  if(digitalRead(5) == 1 && digitalRead(4) == 1) {color_3();}

}

void color_0(){ //單色迴旋
  
  pixels.setBrightness(255);
  for (int i = 0 ; i<NUMPIXELS ; ++i){ 
    
  RGB += 2040/NUMPIXELS ;
  if (RGB > 2040){RGB -= 2040;}
  if (analogRead(A0) <40) {color = 0;}
  if (analogRead(A0) >700 ) {color = 13;}
  if (analogRead(A0) >=40 && analogRead(A0) <= 700) {color = map(analogRead(A0),40,700,0,13);}

  switch (color){
    case 0 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 0; break;
    case 1 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 0; break;
    case 2 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 0; break;
    case 3 : RGB_r = 125 ; RGB_g = 255 ; RGB_b = 0; break;
    case 4 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 0; break;
    case 5 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 125; break;
    case 6 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 7 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 8 : RGB_r = 0 ; RGB_g = 125 ; RGB_b = 255; break;
    case 9 : RGB_r = 0 ; RGB_g = 0 ; RGB_b = 255; break;
    case 10 : RGB_r = 125 ; RGB_g = 0 ; RGB_b = 255; break;
    case 11 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 255; break;
    case 12 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 255; break;
    case 13 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 255; break;
  }
  if (RGB <=255)               {pixels.setPixelColor( i, RGB_r * (255-RGB)/255, RGB_g* (255-RGB)/255, RGB_b* (255-RGB)/255);}
  if (RGB >255 && RGB <= 1785)  {pixels.setPixelColor( i, RGB_r * 0 , RGB_g *0, RGB_b* 0); }
  if (RGB >1785 && RGB<= 2040)   {pixels.setPixelColor( i, RGB_r * (RGB-1785)/255, RGB_g* (RGB-1785)/255, RGB_b* (RGB-1785)/255); }
  
  }
  pixels.show(); 
  delay(1);

}

void color_1(){ //彩虹迴旋
  for (int i = 0 ; i<NUMPIXELS ; ++i){ 
RGB += 1530/NUMPIXELS ;
  if (RGB > 1530){RGB -= 1520;}
  
  if (RGB <=255)               {RGB_r = 255     ; RGB_g = 0         ;RGB_b = 255-RGB;}
  if (RGB >255 && RGB<= 510)   {RGB_r = 255     ; RGB_g = RGB-255 ; RGB_b = 0;}
  if (RGB >510 && RGB<= 765)   {RGB_r = 765-RGB       ; RGB_g = 255;  RGB_b = 0  ;}
  if (RGB >765 && RGB<= 1020)   {RGB_r = 0       ; RGB_g = 255;  RGB_b = RGB-765  ;}
  if (RGB >1020 && RGB<= 1275)   {RGB_r = 0          ; RGB_g = 1275-RGB;  RGB_b = 255  ;}
  if (RGB >1275 && RGB<= 1530)   {RGB_r = RGB - 1275 ; RGB_g = 0;  RGB_b = 255  ;}
  
  
  pixels.setPixelColor( i, RGB_r, RGB_g, RGB_b); } 
  pixels.show(); 
  delay(100);

}





void color_2(){ //固定單色

  pixels.setBrightness(255);

  if (analogRead(A0) <=750){
  if (analogRead(A0) <40) {color = 0;}
  if (analogRead(A0) >700 && analogRead(A0) <= 750) {color = 13;}
  if (analogRead(A0) >=40 && analogRead(A0) <= 700) {color = map(analogRead(A0),40,700,0,13);}
  switch (color){
    case 0 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 0; break;
    case 1 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 0; break;
    case 2 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 0; break;
    case 3 : RGB_r = 125 ; RGB_g = 255 ; RGB_b = 0; break;
    case 4 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 0; break;
    case 5 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 125; break;
    case 6 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 7 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 8 : RGB_r = 0 ; RGB_g = 125 ; RGB_b = 255; break;
    case 9 : RGB_r = 0 ; RGB_g = 0 ; RGB_b = 255; break;
    case 10 : RGB_r = 125 ; RGB_g = 0 ; RGB_b = 255; break;
    case 11 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 255; break;
    case 12 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 255; break;
    case 13 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 255; break;
  }
  for (int i = 0 ; i<NUMPIXELS ; ++i){ 
  pixels.setPixelColor( i, RGB_r, RGB_g, RGB_b); 
  
  } 
  pixels.show();
  delay(100);
  }
  
  if (analogRead(A0) >750){
  RGB += 1 ;
  if (RGB > 1530){RGB -= 1530;}
  if (RGB <=255)               {RGB_r = 255     ; RGB_g =0         ;RGB_b = 255- RGB;}
  if (RGB >255 && RGB<= 510)   {RGB_r = 255     ; RGB_g = RGB- 255 ; RGB_b = 0;}
  if (RGB >510 && RGB<= 765)   {RGB_r = 765-RGB       ; RGB_g = 255;  RGB_b = 0  ;}
  if (RGB >765 && RGB<= 1020)  {RGB_r = 0      ; RGB_g = 255      ;RGB_b = RGB - 765;}
  if (RGB >1020 && RGB<= 1275)  {RGB_r = 0      ; RGB_g = 1275-RGB      ;RGB_b = 255;}
  if (RGB >1275 && RGB<= 1530)  {RGB_r = RGB- 1275      ; RGB_g = 0      ;RGB_b = 255;}
  
  for (int i = 0 ; i<NUMPIXELS ; ++i){ 
  pixels.setPixelColor( i, RGB_r, RGB_g, RGB_b); 
  } 
  pixels.show();
  delay(5);

  }

}

void color_3(){ //呼吸燈
  if (analogRead(A0) <750) {
  RGB_L +=1;
  if (RGB_L >= 510) {RGB_L = 0;}
  if (RGB_L <= 255){pixels.setBrightness(RGB_L);}
  if (RGB_L > 255){pixels.setBrightness(510-RGB_L);}
  
  if (analogRead(A0) <40) {color = 0;}
  if (analogRead(A0) >700 && analogRead(A0) <= 750) {color = 13;}
  if (analogRead(A0) >=40 && analogRead(A0) <= 700) {color = map(analogRead(A0),40,700,0,13);}
  switch (color){
    case 0 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 0; break;
    case 1 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 0; break;
    case 2 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 0; break;
    case 3 : RGB_r = 125 ; RGB_g = 255 ; RGB_b = 0; break;
    case 4 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 0; break;
    case 5 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 125; break;
    case 6 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 7 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 8 : RGB_r = 0 ; RGB_g = 125 ; RGB_b = 255; break;
    case 9 : RGB_r = 0 ; RGB_g = 0 ; RGB_b = 255; break;
    case 10 : RGB_r = 125 ; RGB_g = 0 ; RGB_b = 255; break;
    case 11 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 255; break;
    case 12 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 255; break;
    case 13 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 255; break;
  }
  
  for (int i = 0 ; i<NUMPIXELS ; ++i){ 
  

  pixels.setPixelColor( i, RGB_r, RGB_g, RGB_b); } 
  
  pixels.show(); 
  delay(8);

    
  }
  if (analogRead(A0) > 750) {
  RGB_L +=1;
  if (RGB_L >= 510) {RGB_L = 0; color = random(0,13);
  switch (color){
    case 0 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 0; break;
    case 1 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 0; break;
    case 2 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 0; break;
    case 3 : RGB_r = 125 ; RGB_g = 255 ; RGB_b = 0; break;
    case 4 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 0; break;
    case 5 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 125; break;
    case 6 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 7 : RGB_r = 0 ; RGB_g = 255 ; RGB_b = 255; break;
    case 8 : RGB_r = 0 ; RGB_g = 125 ; RGB_b = 255; break;
    case 9 : RGB_r = 0 ; RGB_g = 0 ; RGB_b = 255; break;
    case 10 : RGB_r = 125 ; RGB_g = 0 ; RGB_b = 255; break;
    case 11 : RGB_r = 255 ; RGB_g = 0 ; RGB_b = 255; break;
    case 12 : RGB_r = 255 ; RGB_g = 125 ; RGB_b = 255; break;
    case 13 : RGB_r = 255 ; RGB_g = 255 ; RGB_b = 255; break;
  }
}
  if (RGB_L <= 255){pixels.setBrightness(RGB_L);}
  if (RGB_L > 255){pixels.setBrightness(510-RGB_L);}
  for (int i = 0 ; i<NUMPIXELS ; ++i){ 
  pixels.setPixelColor( i, RGB_r, RGB_g, RGB_b); } 
  
  pixels.show(); 
  delay(8);
  }
  
}