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#include <BleKeyboard.h>

BleKeyboard bleKeyboard("Synsco Lite", "Synsco", 100);

// Six pads, wired alternately to two touch channels (A/B)
const int PAD_A = T0;   // GPIO4: swipe start
const int PAD_B = T3;   // GPIO15: swipe end
const int TOUCH_THRESHOLD = 30;
const unsigned long SWIPE_WINDOW_MS = 400;  // max time A -> B
const unsigned long COOLDOWN_MS     = 800;  // debounce between shots

unsigned long padATime = 0;
unsigned long lastShot = 0;

void setup() {
  bleKeyboard.begin();
}

void loop() {
  if (!bleKeyboard.isConnected()) return;

  unsigned long now = millis();

  // Stage 1: finger lands on the start pad
  if (touchRead(PAD_A) < TOUCH_THRESHOLD) {
    padATime = now;
  }

  // Stage 2: finger reaches the end pad within the swipe window
  bool swiped = (touchRead(PAD_B) < TOUCH_THRESHOLD) &&
                (padATime > 0) &&
                (now - padATime < SWIPE_WINDOW_MS);

  if (swiped && (now - lastShot > COOLDOWN_MS)) {
    // Volume-Up natively triggers the camera shutter on iOS/Android
    bleKeyboard.write(KEY_MEDIA_VOLUME_UP);
    lastShot = now;
    padATime = 0;
  }
}