using Unity.Entities;
using Unity.Mathematics;

namespace ProjectM.Simulation
{
    /// <summary>
    /// A walk-in travel gate between world regions. A baked entity (visible mesh + this component) at a fixed
    /// position; the server <c>ExpeditionGateSystem</c> transits a player who walks within <see cref="Radius"/>
    /// and whose region matches <see cref="FromRegion"/> to <see cref="ToRegion"/>, placing them at
    /// <see cref="ArrivalPos"/> (offset from the destination gate so they do not immediately re-trigger).
    /// Returning to the base during the Expedition phase also starts Defend early (the "timer cap + early
    /// return" pacing).
    /// </summary>
    public struct ExpeditionGate : IComponentData
    {
        /// <summary>Region a player must currently be in for this gate to act on them (see <see cref="RegionId"/>).</summary>
        public byte FromRegion;

        /// <summary>Region the player is transited to.</summary>
        public byte ToRegion;

        /// <summary>Planar (XZ) trigger radius in world units.</summary>
        public float Radius;

        /// <summary>World position the player arrives at in the destination region.</summary>
        public float3 ArrivalPos;
    }
}