using UnityEngine;

namespace InfiniteWorld.VoxelWorld.Contracts
{
    /// <summary>
    /// Signals that a chunk now has valid nav geometry and dependent coverage windows should invalidate cached builds.
    /// </summary>
    public readonly struct ChunkNavGeometryReadyMessage
    {
        public ChunkNavGeometryReadyMessage(Vector2Int coord, int version)
        {
            Coord = coord;
            Version = version;
        }

        /// <summary>
        /// Chunk coordinate whose nav geometry became available.
        /// </summary>
        public Vector2Int Coord { get; }

        /// <summary>
        /// Version of the chunk runtime state associated with this notification.
        /// </summary>
        public int Version { get; }
    }

    /// <summary>
    /// Signals that a chunk's nav geometry is being removed so dependent coverage windows can drop stale build data.
    /// </summary>
    public readonly struct ChunkNavGeometryRemovedMessage
    {
        public ChunkNavGeometryRemovedMessage(Vector2Int coord, int version)
        {
            Coord = coord;
            Version = version;
        }

        /// <summary>
        /// Chunk coordinate whose nav geometry is no longer available.
        /// </summary>
        public Vector2Int Coord { get; }

        /// <summary>
        /// Last known version of the chunk state before removal.
        /// </summary>
        public int Version { get; }
    }

    /// <summary>
    /// Invalidates consumers that cache the current world interest set.
    /// </summary>
    public readonly struct WorldInterestChangedMessage
    {
        public WorldInterestChangedMessage(int version)
        {
            Version = version;
        }

        /// <summary>
        /// Monotonic version of the world interest state after the change.
        /// </summary>
        public int Version { get; }
    }

    /// <summary>
    /// Invalidates consumers that cache transient nav coverage hints.
    /// </summary>
    public readonly struct NavCoverageHintChangedMessage
    {
        public NavCoverageHintChangedMessage(int version)
        {
            Version = version;
        }

        /// <summary>
        /// Monotonic version of the active nav hint state after the change.
        /// </summary>
        public int Version { get; }
    }
}