/*
 * ESP32 18-LED Interactive Controller - FULL VERSION
 * Pins: 22, 23, 13, 12, 14, 27, 26, 25, 33, 2, 4, 5, 15, 16, 17, 18, 19, 21
 * Button: GPIO 32 (Connect to Pin 32 and GND)
 */

// LED Pin Mapping
const int ledPins[] = {22, 23, 13, 12, 14, 27, 26, 25, 33, 2, 4, 5, 15, 16, 17, 18, 19, 21};
const int totalLeds = 18;
const int buttonPin = 32; 

// Variables for Mode Control
volatile int mode = 0; 
unsigned long lastDebounceTime = 0; 
const int debounceDelay = 250; 

// Interrupt Service Routine (ISR) for the button
void IRAM_ATTR changeMode() {
  if ((millis() - lastDebounceTime) > debounceDelay) {
    mode++;
    if (mode > 2) mode = 0; 
    lastDebounceTime = millis();
  }
}

void setup() {
  for (int i = 0; i < totalLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }

  // Set up button with internal pullup
  pinMode(buttonPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(buttonPin), changeMode, FALLING);
  
  randomSeed(analogRead(0));
}

void loop() {
  switch (mode) {
    case 0: // Mode 1: Energetic
      simpleChase(50);
      meetingPoint(80);
      break;

    case 1: // Mode 2: Shimmering
      theaterChase(100);
      sparkle(20, 50);
      break;

    case 2: // Mode 3: Atmospheric
      heartbeat(1);
      breathingEffect(); 
      break;
  }
}

// --- PATTERN FUNCTIONS ---

void simpleChase(int speed) {
  for (int i = 0; i < totalLeds; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(speed);
    digitalWrite(ledPins[i], LOW);
    if (mode != 0) return; // Exit early if mode changed
  }
}

void meetingPoint(int speed) {
  int half = totalLeds / 2;
  // Inward
  for (int i = 0; i < half; i++) {
    digitalWrite(ledPins[i], HIGH);
    digitalWrite(ledPins[totalLeds - 1 - i], HIGH);
    delay(speed);
    digitalWrite(ledPins[i], LOW);
    digitalWrite(ledPins[totalLeds - 1 - i], LOW);
  }
  // Outward
  for (int i = half - 1; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    digitalWrite(ledPins[totalLeds - 1 - i], HIGH);
    delay(speed);
    digitalWrite(ledPins[i], LOW);
    digitalWrite(ledPins[totalLeds - 1 - i], LOW);
  }
}

void theaterChase(int speed) {
  for (int q = 0; q < 3; q++) {
    for (int i = 0; i < totalLeds; i = i + 3) {
      if (i + q < totalLeds) digitalWrite(ledPins[i + q], HIGH);
    }
    delay(speed);
    for (int i = 0; i < totalLeds; i = i + 3) {
      if (i + q < totalLeds) digitalWrite(ledPins[i + q], LOW);
    }
  }
}

void sparkle(int count, int duration) {
  for (int i = 0; i < count; i++) {
    int index = random(0, totalLeds);
    digitalWrite(ledPins[index], HIGH);
    delay(duration);
    digitalWrite(ledPins[index], LOW);
    if (mode != 1) return;
  }
}

void heartbeat(int times) {
  for (int i = 0; i < times; i++) {
    allLeds(HIGH); delay(100);
    allLeds(LOW);  delay(100);
    allLeds(HIGH); delay(150);
    allLeds(LOW);  delay(600);
  }
}

void breathingEffect() {
  // Simulating a glow since simple digital pins can't fade without PWM
  allLeds(HIGH);
  delay(500);
  allLeds(LOW);
  delay(500);
}

void allLeds(int state) {
  for (int i = 0; i < totalLeds; i++) {
    digitalWrite(ledPins[i], state);
  }
}