/*
   Project:       FastLED Light Saber
   Description:   Demonstrates a very basic animation
                  for a light saber using FastLED
   Creation date: 7/22/23
   Author:        AnonEngineering

   License: https://en.wikipedia.org/wiki/Beerware
*/

#include <FastLED.h>

#define LED_TYPE    WS2812B
#define COLOR_ORDER GRB
#define NUM_LEDS    25

const int LED_PIN = 2;
const int BTN_PIN = 3;
const long INTERVAL = 50;

bool saberMode = false;
int oldBtnState = 1;
unsigned long previousTime = 0;

CRGB leds[NUM_LEDS];

void checkButton()  {
  int btnState = digitalRead(BTN_PIN);
  if (btnState != oldBtnState)  {
    if (btnState == LOW)  {
      saberMode = !saberMode;
      //Serial.println("Button pressed");
      Serial.print("Saber mode: ");
      Serial.println(saberMode ? "On" : "Off");
    } else  {
      //Serial.println("Button released");
    }
    delay(20);  // for debounce
  }
  oldBtnState = btnState;
}

void doSaber()  {
  static int ledVal = 0;

  if (saberMode == true )  {
    if (millis() - previousTime >= INTERVAL)  {
      previousTime = millis();
      leds[ledVal] = CRGB(2, 248, 6);
      ledVal++;
      if (ledVal > NUM_LEDS) ledVal = NUM_LEDS;
      FastLED.show();
    }
  } else  {
    if (millis() - previousTime >= INTERVAL)  {
      previousTime = millis();
      leds[ledVal] = CRGB::Black;
      ledVal--;
      if (ledVal < 0) ledVal = 0;
      FastLED.show();
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(BTN_PIN, INPUT_PULLUP);
  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
}

void loop() {
  checkButton();
  doSaber();
}