#include <FastLED.h>

#define BTN_PIN     7
#define LED_PIN     6
#define NUM_LEDS    256
#define NUM_PAL     8

CRGB leds[NUM_LEDS];
CRGBPalette16 pals[NUM_PAL];

int pal = 0;
int btn = HIGH;

void info() {
    switch(pal) {
        case 0: Serial.println("Cloud Colors");
        break;
        case 1: Serial.println("Lava Colors");
        break;
        case 2: Serial.println("Ocean Colors");
        break;
        case 3: Serial.println("Forest Colors");
        break;
        case 4: Serial.println("Rainbow Colors");
        break;
        case 5: Serial.println("Rainbow Stripe Colors");
        break;
        case 6: Serial.println("Party Colors");
        break;
        case 7: Serial.println("Heat Colors");
        break;
        default: Serial.println("Unknown palette");
        break;
    }
}

void setup() {
    Serial.begin(115200);
    pinMode(BTN_PIN, INPUT_PULLUP);
    pals[0] = CloudColors_p;
    pals[1] = LavaColors_p;
    pals[2] = OceanColors_p;
    pals[3] = ForestColors_p;
    pals[4] = RainbowColors_p;
    pals[5] = RainbowStripeColors_p;
    pals[6] = PartyColors_p;
    pals[7] = HeatColors_p;
    FastLED.addLeds<NEOPIXEL, LED_PIN>(leds, NUM_LEDS);
    info();
}

void loop() {
    int state = digitalRead(BTN_PIN);
    if (btn != state) {
        if (state == LOW) {
            pal++;
            pal = pal >= NUM_PAL ? 0 : pal;
            info();
        }
    }
    btn = state;
    for(int i = 0; i < NUM_LEDS; i++) {
        leds[i] = ColorFromPalette(pals[pal], i);
    }
    FastLED.show();
    delay(10);
}