#include <Adafruit_NeoPixel.h>

// ---------- SENSOR ----------
#define SENSOR_PIN D2   // IR sensor

int lastState = 1;

// ---------- LED STRIP ----------
#define LED_PIN D1
#define TOTAL_LEDS 60

Adafruit_NeoPixel strip(TOTAL_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

// ---------- CONTROL ----------
bool goalActive = false;
unsigned long goalStartTime = 0;
const int goalDuration = 2000; // 2 seconds

unsigned long lastBlinkTime = 0;
bool ledState = false;
const int blinkInterval = 100; // blinking speed (ms)

void setup() {
  Serial.begin(115200);

  pinMode(SENSOR_PIN, INPUT);

  strip.begin();
  strip.clear();
  strip.show();

  Serial.println("Goal + LED system ready");
}

void loop() {
  int currentState = digitalRead(SENSOR_PIN);

  // Detect goal (falling edge)
  if (lastState == 1 && currentState == 0 && !goalActive) {
    Serial.println("GOAL!! ⚽");

    goalActive = true;
    goalStartTime = millis();
  }

  lastState = currentState;

  // ---------- ANIMATION ----------
  if (goalActive) {
    unsigned long currentTime = millis();

    // Blinking
    if (currentTime - lastBlinkTime > blinkInterval) {
      lastBlinkTime = currentTime;
      ledState = !ledState;

      if (ledState) {
        setAllGreen();
      } else {
        strip.clear();
        strip.show();
      }
    }

    // End of animation (2 seconds)
    if (currentTime - goalStartTime > goalDuration) {
      goalActive = false;
      strip.clear();
      strip.show();
    }
  }
}

// ---------- FUNCTIONS ----------
void setAllGreen() {
  for (int i = 0; i < TOTAL_LEDS; i++) {
    strip.setPixelColor(i, strip.Color(0, 255, 0));
  }
  strip.show();
}