Wooden USB-powered RGB-LED lamp sketch

#include <FastLED.h>
#define NUM_LEDS 5
#define DATA_PIN 3

int hue = 128;
int saturation = 255;
int brightness = 255;
int cosBright[] = { 250, 248, 243, 236, 226, 213, 198, 181, 163, 144, 125, 105, 86, 68, 51, 36, 23, 13, 6, 1, 0, 1, 6, 13, 23, 36, 51, 68, 86, 105, 125, 144, 163, 181, 198, 213, 226, 236, 243, 248 };

unsigned long updateTime = 25;
unsigned long partyTime = 520;
unsigned long startTime = 0;
unsigned long timeoutTime = 5000000;
unsigned long clickDuration;

int state = 1;
int index = 0;
int stufe = 0;

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
  pinMode(4, INPUT);
}

void loop() {

  switch (state) {

    case 1:
      saturation = 255;
      brightness = 255;
      if (millis() - startTime > updateTime) {
        for (int dot = 0; dot < NUM_LEDS; dot++) {
          leds[dot].setHSV( hue, saturation, brightness);
        }
        startTime = millis();
      }
      FastLED.show();
      clickDuration = pulseIn(4, HIGH, timeoutTime);
      if (clickDuration > 10 && clickDuration < 1000000) {
        clickDuration = pulseIn(4, HIGH, 300000);
        if (clickDuration > 50000 && clickDuration < 200000) {
          state = 3;
        }
        else {
          hue = hue + 16;
          hue = hue % 256;
        }
      }
      else if (clickDuration >= 1000000) {
        state = 2;

      }
      break;

    case 2:
      while (digitalRead(4) == LOW) {
        saturation = 255;
        brightness = cosBright[index];
        constrain(brightness, 10, 255);
        index++;
        index = index % 40;

        hue = hue + 1;
        hue = hue % 256;

        for (int dot = 0; dot < NUM_LEDS; dot++) {
          leds[dot].setHSV( (hue + (dot * 60)), 255, brightness);

        }

        FastLED.show();
        delay(partyTime / 40); //geht schöner
      }
      state = 1;
      break;

    case 3:
      brightness = (64 * (stufe + 1)) - 1;
      saturation = 0;
      if (millis() - startTime > updateTime) {
        for (int dot = 0; dot < NUM_LEDS; dot++) {
          leds[dot].setHSV( hue, saturation, brightness);

        }
        startTime = millis();
      }
      FastLED.show();
      clickDuration = pulseIn(4, HIGH, timeoutTime);
      if (clickDuration > 10 && clickDuration < 1000000) {
        clickDuration = pulseIn(4, HIGH, 300000);
        if (clickDuration > 50000 && clickDuration < 200000) {
          state = 1;
          stufe = 0;
        }
        else {
          stufe = stufe + 1;
          stufe = stufe % 4;
        }
      }
      else if (clickDuration >= 1000000) {
        state = 2;

      }
      break;

  }

}