#include <Arduino.h>

const int LED_PIN = 15;      
const int BUTTON_PIN = 14;   

unsigned long ledOffTime = 0;
unsigned long reactionTime = 0;
bool waitingForReaction = false;
bool buttonPressed = false;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT); 
  Serial1.begin(115200);
  delay(2000);
  
  Serial1.println("REACTION GAME");
  Serial1.println("Game starting in 2 seconds...");
  delay(2000);
  startNewRound();
}

void loop() {
  int buttonState = digitalRead(BUTTON_PIN);
  
  if (buttonState == HIGH && waitingForReaction && !buttonPressed) {
    buttonPressed = true;
    reactionTime = millis() - ledOffTime;
    
    Serial1.print("Reaction time: ");
    Serial1.print(reactionTime);
    Serial1.println(" ms");
    
    giveFeedback(reactionTime);
    
    waitingForReaction = false;
    
    delay(2000);
    startNewRound();
  }
  
 
  if (buttonState == LOW) {
    buttonPressed = false;
  }
  
  delay(10);
}

void startNewRound() {
  Serial1.println("\nNEW ROUND");
  Serial1.println("LED ON - Get ready...");
  
  digitalWrite(LED_PIN, HIGH);
  
  int randomDelay = random(1000, 1000);
  Serial1.print("Waiting ");
  Serial1.print(randomDelay);
  Serial1.println(" ms");
  
  delay(randomDelay);
  
  digitalWrite(LED_PIN, LOW);
  ledOffTime = millis();
  waitingForReaction = true;
  
  Serial1.println("LED OFF - PRESS BUTTON NOW!");
}

void giveFeedback(unsigned long time) {
}