#include <Arduino.h>

#include <FastLED.h>

void buttonPressed();

// How many leds in your strip?
#define NUM_LEDS 300

//defining locations of pins
#define DATA_PIN 2
#define BUTTON_PIN 4

// Define the array of leds
CRGB leds[NUM_LEDS];

//assigning locations of pins
int buttonPin = 4;
int ledPin = 13;

//file object to store csv
//File dataFile;

unsigned volatile long buttonPressTime = millis();
bool volatile buttonFlag = false;

void buttonPressed() {
  unsigned long current = millis();

  if(buttonPressTime + 100 < current){
    buttonFlag = true;
    buttonPressTime = current;
  }
}

void setup() {

  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);  // GRB ordering is assumed
  Serial.begin(9600);
  pinMode(BUTTON_PIN, INPUT_PULLUP);  //use internal pullup resistor
  attachInterrupt(buttonPin, buttonPressed, FALLING);

}  //void setup

int maxRounds = 5;     // max loop
int roundCounter = 0;  // initialized counter

double loopDelay = 1;
int correctLED = 88;
unsigned long startTime = 0;
unsigned long loopTime = 0;
unsigned long correctTime = 0;


void loop() {
  if (roundCounter > maxRounds - 1) {
    fill_solid(leds, NUM_LEDS, CRGB::Black);  // turn LEDs off
    FastLED.show();
    Serial.println("Max rounds reached. Stopping program.");
    while (true) {
      // Program is effectively stopped here
    }
      //return; // Exit the loop function and stop further execution
  }

  for (int i = 0; i < NUM_LEDS; i++) {

    //turns light on to white, delays, turns it off(black)
    leds[i] = CRGB::White;
    FastLED.show();
    //delay(loopDelay);
    delayMicroseconds(loopDelay);
    leds[i] = CRGB::Black;
    if (i == correctLED) correctTime = millis();
    FastLED.show();
  }

  if (buttonFlag) {
    long timeDiff = correctTime - buttonPressTime;
    if (abs(timeDiff) < 10){
      Serial.println("Perfect timing!");
      Serial.println(correctTime);
    } else if (timeDiff > 0) {
      Serial.print("Too early! Time difference: ");
      Serial.println(correctTime - buttonPressTime);
    } else if (timeDiff < 0) {
      Serial.print("Too late! Time difference: ");
      Serial.println(buttonPressTime - correctTime);
    }
    buttonFlag = false;
  }

  roundCounter++;
  }  //loop