#include "FastLED.h" 
#define BUTTON_PIN 3
#define NUM_LEDS 30
#define DATA_PIN 7

volatile bool action = false;
int intensityPin = A0;
int speedPin = A2;
int speed;
int intensity;

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812, DATA_PIN>(leds, NUM_LEDS);
  pinMode(speedPin, INPUT);
  pinMode(intensityPin, INPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  if (action) {
    // allLED();
    action = false;
  } else {
    allLED();
  }
}

void buttonPressed() {
  action = true;
}

void allLED() {
  red_led();
  green_led();
  blue_led();
}

void red_led() {
  if (digitalRead(BUTTON_PIN) == LOW)
    for (int i = 0; i <= NUM_LEDS; i++) {
      leds[i] = CRGB(0,intensity,0);
      intensity = map(analogRead(intensityPin),0,1023,0,255);
      delay(speed);
      speed = map(analogRead(speedPin),0,1023,255,0);
      FastLED.show();
      FastLED.clear();
    }
}

void green_led() {
  if (digitalRead(BUTTON_PIN) == LOW)
    for (int i = 0; i <= NUM_LEDS; i++) {
      leds[i] = CRGB(intensity,0,0);
      intensity = map(analogRead(intensityPin),0,1023,0,255);
      delay(speed);
      speed = map(analogRead(speedPin),0,1023,255,0);
      FastLED.show();
      FastLED.clear();
    }
}

void blue_led() {
  if (digitalRead(BUTTON_PIN) == LOW)
    for (int i = 0; i <= NUM_LEDS; i++) {
      leds[i] = CRGB(0,0,intensity);
      intensity = map(analogRead(intensityPin),0,1023,0,255);
      delay(speed);
      speed = map(analogRead(speedPin),0,1023,255,0);
      FastLED.show();
      FastLED.clear();
    }
}