Do not understand button functions. (ESP32, FastLED, OneButton)

PlatformIO IDE
1

I am trying to fudge together a code for the Heltec ESP32 Wifi Kit to be able to change NeoPixel patterns with a button push but I’m having a very difficult time understanding how to get the button push to change between “functions”. Any help is greatly appreciated.

#include <Arduino.h>
#include <U8g2lib.h>
#define FASTLED_INTERNAL
#include <FastLED.h>
#include <OneButton.h>
 
#define OLED_CLOCK  15          
#define OLED_DATA   4
#define OLED_RESET  16
 
#define NUM_LEDS    60        
#define LED_PIN     5
#define BUTTON_PIN  14
 
 OneButton button1(14, true);

CRGB g_LEDs[NUM_LEDS] = {0};   
 
U8G2_SSD1306_128X64_NONAME_F_HW_I2C g_OLED(U8G2_R2, OLED_RESET, OLED_CLOCK, OLED_DATA);
int g_lineHeight = 0;
 

 
double FramesPerSecond(double seconds)
{
  static double framesPerSecond; 
  framesPerSecond = (framesPerSecond * .9) + (1.0 / seconds * .1);
  return framesPerSecond;

  
}
 
void setup() 

{
  
  pinMode(LED_PIN, OUTPUT);
 
  Serial.begin(115200);
  while (!Serial) { }
  Serial.println("ESP32 Startup");

   

  
  g_OLED.begin();
  g_OLED.clear();
  g_OLED.setFont(u8g2_font_profont15_tf);
  g_lineHeight = g_OLED.getFontAscent() - g_OLED.getFontDescent();       
 
  FastLED.addLeds<WS2812B, LED_PIN, GRB>(g_LEDs, NUM_LEDS);               
  FastLED.setBrightness(255);
}
 
void loop() 
{ 
button1.tick();
delay(10);

if (button1 =! HIGH);


   switch(button1);
  ( 


case 0:
void DrawComet();
{

   g_OLED.clearBuffer();
    g_OLED.setCursor(0, g_lineHeight);
    g_OLED.printf("COMET");
    g_OLED.sendBuffer();

    const byte fadeAmt = 128;
    const int cometSize = 5;
    const int deltaHue  = 4;

    static byte hue = HUE_RED;
    static int iDirection = 1;
    static int iPos = 0;

    hue += deltaHue;

    iPos += iDirection;
    if (iPos == (NUM_LEDS - cometSize) || iPos == 0)
        iDirection *= -1;
    
    for (int i = 0; i < cometSize; i++)
        g_LEDs[iPos + i].setHue(hue);
    
    
    for (int j = 0; j < NUM_LEDS; j++)
        if (random(10) > 5)
            g_LEDs[j] = g_LEDs[j].fadeToBlackBy(fadeAmt);  

    delay(0.5);
}
break;



case 1:
void rainbow(); {
  uint8_t initialHue = 0;
  const uint8_t deltaHue = 16;
  const uint8_t hueDensity = 4;
 
  for (;;)
  {
   
 
    double dStart = millis() / 1000.0;                                    
    // Handle OLED drawing
 
    g_OLED.clearBuffer();
    g_OLED.setCursor(0, g_lineHeight);
    g_OLED.printf("RAINBOW");
    g_OLED.sendBuffer();
 
    
 
    fill_rainbow(g_LEDs, NUM_LEDS, initialHue += hueDensity, deltaHue);

  }
  break;
}
  )

}


    FastLED.show();
 
    double dEnd = millis() / 1000.0;