package namespace

type FileSizeQuota struct {
	AllowanceKB  int64
	CurrentUsage int64
}

func (f *FileSizeQuota) Allows(size int64) bool {
	return f.Remaining() >= size
}

func (f *FileSizeQuota) Remaining() int64 {
	return f.AllowanceKB - f.CurrentUsage
}

func (f *FileSizeQuota) Add(size int64) error {
	if !f.Allows(size) {
		return ErrExceedQuota
	}

	f.CurrentUsage += size

	return nil
}

func (f *FileSizeQuota) Remove(size int64) error {
	if size > f.CurrentUsage {
		return ErrQuotaInvalid
	}

	f.CurrentUsage -= size

	return nil
}

type FileStat struct {
	Num   int64
	SizeB int64
}

func (s FileStat) Add(size int64) FileStat {
	return FileStat{
		s.Num + 1,
		s.SizeB + size,
	}
}