Simple 2-Mode Strip

#include "FastLED.h"

#define NUM_LEDS 10
#define DATA_PIN 12
#define BUTTON_PIN  3
#define POT_PIN A0

CRGB leds[NUM_LEDS];

int stripState = 0;
int caseMax = 2;
int buttonState = LOW;
int lastButtonState = LOW;
long lastDebounceTime = 0;
int debounceDelay = 50;
long modeTime;
int modeDelay = 10000;
int buttonReading;

void setup() {
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {

  buttonReading = digitalRead(BUTTON_PIN);
  Serial.println(digitalRead(BUTTON_PIN));
  /*
    if (buttonReading != lastButtonState) {
      lastDebounceTime = millis();
    }
    if ((millis() - lastDebounceTime) > debounceDelay) {
      if (buttonReading != buttonState) {
        buttonState = buttonReading;
        if (buttonState == LOW) {
          stripState = (stripState + 1) % caseMax;
          modeTime = millis();
        }
      }
    }
    lastButtonState = buttonReading;
  */
  if (millis() > modeTime + modeDelay) {
    modeTime = millis();
    stripState = (stripState + 1) % caseMax;
  }

  if (stripState == 0) {
    for (int i = 0; i < NUM_LEDS; i++) {
      leds[i] = CRGB::White;
    }
  }

  if (stripState == 1) {
    for (int i = 0; i < NUM_LEDS; i++) {
      leds[i] = CHSV(analogRead(POT_PIN), 255, 255);
    }
  }
  FastLED.show();
}