using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Singleton tag baked into the Enemy-test GYM subscene (see the LANTERN roadmap A1 gym note). Marks the world
    /// as the gym so <c>GoInGameServerSystem</c> takes the CLEAN gym spawn path — bypassing the base/meta/cycle
    /// seeding (the gym has no CycleDirector, so the meta-catalog spawn guard must not block it) and seeding a
    /// default Spark socket loadout instead. Purely a mode switch; the gym never runs the base siege/economy.
    /// </summary>
    public struct GymTag : IComponentData { }

    /// <summary>
    /// Baked gym enemy roster — one row per on-demand-spawnable enemy KIND (buffer index is arbitrary; match on
    /// <see cref="Kind"/>). <c>DebugCommandReceiveSystem</c>'s SpawnEnemy op instantiates the row whose Kind ==
    /// ArgA near the requesting player. Entity refs can't live in a blob, so this is a companion buffer on the
    /// gym-roster entity (the <see cref="AbilityPrefabElement"/> idiom). Server-read only.
    /// </summary>
    [InternalBufferCapacity(4)]
    public struct GymEnemyRoster : IBufferElementData
    {
        /// <summary>Stable enemy-kind key (0 = Drowner, 1 = Grindylow; extend as the roster grows).</summary>
        public byte Kind;

        /// <summary>The baked enemy ghost prefab entity to instantiate for this kind.</summary>
        public Entity Prefab;
    }

    /// <summary>Stable kind ids for <see cref="GymEnemyRoster.Kind"/> / the SpawnEnemy op's ArgA.</summary>
    public static class GymEnemyKind
    {
        public const byte Drowner = 0;
        public const byte Grindylow = 1;
    }
}