#include <FastLED.h>

#define NUM_LEDS 8
#define din 4
#define btn 5
#define led 14

CRGB leds[NUM_LEDS];

byte hue = 0;
int delayTime = 100;
bool mode = true;

void setup() { 
  Serial.begin(115200);
  Serial.println("Start");
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);
  pinMode(btn, INPUT_PULLUP);
  FastLED.addLeds<WS2812,din,GRB>(leds,NUM_LEDS);
  FastLED.setBrightness(255);
  while(digitalRead(btn));
  digitalWrite(led, 1);
  delay(250);
}

void loop() { 
    if(mode){
        chaseLeft();
        chaseRight();
        centerOut();
        allOn();
        quickFlash();
        slowFlash();
        altFlash1();
        altFlash2();
    }
    else{
        if(!digitalRead(btn)){
            digitalWrite(led, 1);
            mode = true;
            delay(500);
        }
    }
}


void btnCheck(){
    unsigned long timer = millis();
    while(!digitalRead(btn)){
        if(millis() - timer > 2000){
            Serial.println("Turning off LEDs");
            FastLED.clear();
            FastLED.show();
            digitalWrite(led, 0);
            mode = false;
            delay(3000);
        }
        delay(250);
    }
}

void chaseLeft(){
  Serial.println("Chase Left");
    while(digitalRead(btn)){
        for(int i=7;i>=0;i--){
            leds[i] = CHSV(hue, 255, 160);
            leds[i-1] = CHSV(hue, 255, 192);
            leds[i-2] = CHSV(hue, 255, 224);
            leds[i-3] = CHSV(hue, 255, 255);
	        FastLED.show(); 
            delay(delayTime);
            leds[i] = CHSV(hue, 255, 0);
		    FastLED.show(); 
            if(!digitalRead(btn)) break;
        }
    }
        btnCheck();
}

void chaseRight(){
  Serial.println("Chase Right");
    while(digitalRead(btn)){
        for(int i=0;i<8;i++){
            leds[i] = CHSV(hue, 255, 160);
            leds[i+1] = CHSV(hue, 255, 192);
            leds[i+2] = CHSV(hue, 255, 224);
            leds[i+3] = CHSV(hue, 255, 255);
	        FastLED.show(); 
            delay(delayTime);
            leds[i] = CHSV(hue, 255, 0);
		    FastLED.show(); 
            if(!digitalRead(btn)) break;
        }
    }
        btnCheck();
}

void centerOut(){
  Serial.println("Center Out");
    while(digitalRead(btn)){
        for(int i=0;i<4;i++){
            leds[3-i] = CHSV(hue, 255, 192);
            leds[4+i] = CHSV(hue, 255, 192);
            leds[2-i] = CHSV(hue, 255, 255);
            leds[5+i] = CHSV(hue, 255, 255);
	        FastLED.show(); 
            delay(delayTime*1.5);
            leds[3-i] = CHSV(hue, 255, 0);
            leds[4+i] = CHSV(hue, 255, 0);
		    FastLED.show(); 
            if(!digitalRead(btn)) break;
        }
    }
        btnCheck();
}

void allOn(){
  Serial.println("All ON");
    while(digitalRead(btn)){
        for(int i=0;i<8;i++){
            leds[i] = CHSV(hue, 255, 255);
        }
        FastLED.show(); 
        if(!digitalRead(btn)) break;
    }
        btnCheck();
}

void quickFlash(){
  Serial.println("All ON Quick Flashing");
    while(digitalRead(btn)){
        for(int k=0;k<10;k++){
            for(int i=0;i<8;i++){
                leds[i] = CHSV(hue, 255, k*25);
            }
            FastLED.show();
            delay(10);
        }
        delay(delayTime); 
        if(!digitalRead(btn)) break;
        for(int k=10;k>=0;k--){
            for(int i=0;i<8;i++){
                leds[i] = CHSV(hue, 255, k*25);
            }
            FastLED.show();
            delay(10);
        }
        delay(delayTime); 
        if(!digitalRead(btn)) break;
    }
        btnCheck();
}

void slowFlash(){
  Serial.println("All ON Slow Flashing");
    while(digitalRead(btn)){
        for(int k=0;k<10;k++){
            for(int i=0;i<8;i++){
                leds[i] = CHSV(hue, 255, k*25);
            }
            FastLED.show();
            delay(20);
        }
        for(int i=0;i<10;i++){ 
            if(!digitalRead(btn)) break;
            delay(delayTime);
        }
        if(!digitalRead(btn)) break;
        for(int k=10;k>=0;k--){
            for(int i=0;i<8;i++){
                leds[i] = CHSV(hue, 255, k*25);
            }
            FastLED.show();
            delay(20);
        }
        for(int i=0;i<5;i++){ 
            if(!digitalRead(btn)) break;
            delay(delayTime);
        }
        if(!digitalRead(btn)) break;
    }
        btnCheck();
}

void altFlash1(){
  Serial.println("Alternating 4 and 4 Flashing");
    while(digitalRead(btn)){
        for(int i=0;i<4;i++){
            leds[i] = CHSV(hue, 255, 255);
            leds[i+4] = CHSV(hue, 255, 0);
        }
        FastLED.show();
        for(int i=0;i<5;i++){ 
            if(!digitalRead(btn)) break;
            delay(delayTime);
        }
        if(!digitalRead(btn)) break;
        for(int i=0;i<4;i++){
            leds[i+4] = CHSV(hue, 255, 255);
            leds[i] = CHSV(hue, 255, 0);
        }
        FastLED.show();
        for(int i=0;i<5;i++){ 
            if(!digitalRead(btn)) break;
            delay(delayTime);
        }
        if(!digitalRead(btn)) break;
    }
        btnCheck();
}

void altFlash2(){
  Serial.println("Alternating 1,3,5,7 and 2,4,6,8");
    while(digitalRead(btn)){
        leds[0] = CHSV(hue, 255, 255);
        leds[1] = CHSV(hue, 255, 0);
        leds[2] = CHSV(hue, 255, 255);
        leds[3] = CHSV(hue, 255, 0);
        leds[4] = CHSV(hue, 255, 255);
        leds[5] = CHSV(hue, 255, 0);
        leds[6] = CHSV(hue, 255, 255);
        leds[7] = CHSV(hue, 255, 0);
        FastLED.show();
        for(int i=0;i<5;i++){ 
            if(!digitalRead(btn)) break;
            delay(delayTime);
        }
        if(!digitalRead(btn)) break;

        leds[0] = CHSV(hue, 255, 0);
        leds[1] = CHSV(hue, 255, 255);
        leds[2] = CHSV(hue, 255, 0);
        leds[3] = CHSV(hue, 255, 255);
        leds[4] = CHSV(hue, 255, 0);
        leds[5] = CHSV(hue, 255, 255);
        leds[6] = CHSV(hue, 255, 0);
        leds[7] = CHSV(hue, 255, 255);
        FastLED.show();
        for(int i=0;i<5;i++){ 
            if(!digitalRead(btn)) break;
            delay(delayTime);
        }
        if(!digitalRead(btn)) break;
    }
        btnCheck();
}