using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Singleton holding the physics-filter mask of the static world-collision layer ("Environment"): the baked
    /// boundary ring + landmark colliders the player CC sweeps. Baked from the GameObject layer at edit-time (see
    /// WorldCollisionAuthoring) so server systems can build a <c>CollisionFilter</c> in Burst WITHOUT a managed
    /// <c>LayerMask.NameToLayer</c> call or a hardcoded layer index. Read by <see cref="ProjectM.Server"/>'s
    /// EnemyAISystem to sweep-test Husk movement against the environment only (never the player / other Husks).
    /// </summary>
    public struct WorldCollisionConfig : IComponentData
    {
        /// <summary>BelongsTo bitmask of the Environment physics layer (<c>1u &lt;&lt; layerIndex</c>).</summary>
        /// <summary>BelongsTo bitmask of the Environment physics layer (<c>1u &lt;&lt; layerIndex</c>).</summary>
        public uint EnvironmentMask;

        /// <summary>DR-042 C5: BelongsTo bitmask of the "Structure" physics layer (player-built Wall/Turret/Pylon
        /// colliders). OR'd into the enemy-movement sweep filter so husks collide-and-slide against walls. 0 if the
        /// layer is absent (feature inert). The layer matrix excludes Structure&times;the player layer so the player CC
        /// passes through its own walls.</summary>
        public uint StructureMask;
    }
}