enum WeaponState { idle, firing }

abstract class Weapon {
  final String name;
  final int idleSprite;
  final List<int> fireFrames;
  final int damage;
  final int msPerFrame;

  WeaponState state = WeaponState.idle;
  int frameIndex = 0;
  int lastFrameTime = 0;

  Weapon({
    required this.name,
    required this.idleSprite,
    required this.fireFrames,
    required this.damage,
    this.msPerFrame = 100,
  });

  int get currentSprite =>
      state == WeaponState.idle ? idleSprite : fireFrames[frameIndex];

  /// Core firing logic. Returns true if a bullet was spent.
  bool fire(int currentTime, {required int currentAmmo}) {
    if (state == WeaponState.idle && currentAmmo > 0) {
      state = WeaponState.firing;
      frameIndex = 0;
      lastFrameTime = currentTime;
      return true;
    }
    return false;
  }

  void update(int currentTime) {
    if (state == WeaponState.firing) {
      if (currentTime - lastFrameTime > msPerFrame) {
        frameIndex++;
        lastFrameTime = currentTime;
        if (frameIndex >= fireFrames.length) {
          state = WeaponState.idle;
          frameIndex = 0;
        }
      }
    }
  }
}