namespace Misaki.AoVolume
{
    internal readonly struct VolumeEntity
    {
        private const int _INVALID_INDEX = -1;

        public readonly int entityIndex;
        public readonly bool IsValid => entityIndex != _INVALID_INDEX;

        public static readonly VolumeEntity Invalid = new(_INVALID_INDEX);

        public VolumeEntity(int index)
        {
            this.entityIndex = index;
        }
    }

    // Intermediate struct which holds the data index of an entity and other information.
    internal readonly struct VolumeEntityInfo
    {
        private const int _INVALID_INDEX = -1;

        public readonly int dataIndex;

        public static readonly VolumeEntityInfo Invalid = new VolumeEntityInfo(_INVALID_INDEX);

        public bool IsValid => dataIndex != _INVALID_INDEX;

        public VolumeEntityInfo(int dataIndex)
        {
            this.dataIndex = dataIndex;
        }
    }
}