(() => {
  function sameTarget(left, right) { return left?.x === right?.x && left?.y === right?.y; }

  function createTargetActivator({ canFire, select, fire, thresholdMs = 360, now = () => Date.now() }) {
    let lastTap;
    let firing = false;

    async function fireOnce(target) {
      if (firing || !canFire(target)) return false;
      firing = true;
      lastTap = undefined;
      try {
        await fire(target);
        return true;
      } finally {
        firing = false;
      }
    }

    function tap(target) {
      if (firing || !canFire(target)) return { action: 'ignored' };
      const timestampMs = now();
      if (lastTap && sameTarget(lastTap.target, target) && timestampMs - lastTap.timestampMs <= thresholdMs) {
        return { action: 'fire', promise: fireOnce(target) };
      }
      select(target);
      lastTap = { target, timestampMs };
      return { action: 'select' };
    }

    function keyboard(target) {
      if (firing || !canFire(target)) return { action: 'ignored' };
      select(target);
      lastTap = undefined;
      return { action: 'select' };
    }

    return {
      tap,
      keyboard,
      doubleActivate: (target) => ({ action: 'fire', promise: fireOnce(target) }),
      isFiring: () => firing,
    };
  }

  const api = { createTargetActivator };
  if (typeof module !== 'undefined' && module.exports) module.exports = api;
  else globalThis.BattleshipTargetInteraction = api;
})();