using ProjectM.Simulation;
using Unity.Entities;
using UnityEngine;

namespace ProjectM.Authoring
{
    /// <summary>
    /// Generic authoring for a non-functional build-structure ghost prefab (Wall / Pylon) — duplicate
    /// Turret.prefab so the ownerless interpolated GhostAuthoringComponent on PlacedStructure.Type comes free,
    /// then swap TurretAuthoring for this. Bakes ONLY <see cref="PlacedStructure"/>{Type=<see cref="Kind"/>}
    /// (no <see cref="Turret"/> stats, so TurretFireSystem ignores it). BuildPlaceSystem overrides Cell +
    /// LastProcessedTick and adds RegionTag{Base} at placement. <see cref="Kind"/> is a byte (StructureType.*) to
    /// dodge the cross-assembly enum-in-Burst hazard and the MCP enum-drop gotcha.
    /// </summary>
    public class StructureAuthoring : MonoBehaviour
    {
        [Tooltip("StructureType byte: 5 = Wall, 6 = Pylon (do NOT use 1-4: Turret + reserved M7 automation).")]
        public byte Kind = StructureType.Wall;

        [Min(1f)] public float MaxHp = 150f;

        private class StructureBaker : Baker<StructureAuthoring>
        {
            public override void Bake(StructureAuthoring authoring)
            {
                var entity = GetEntity(authoring, TransformUsageFlags.Dynamic);
                AddComponent(entity, new PlacedStructure
                {
                    Type = authoring.Kind,
                    Cell = default,
                    NextTick = 0u,
                    LastProcessedTick = 0u,
                });
                // EB-1: Wall/Pylon are damageable + destructible AI targets (a wall soaks Husk strikes that would
                // otherwise hit a turret). DamageEvent buffer MUST exist or an AI strike crashes at ECB playback.
                // No HitRadius -> ProjectileDamageSystem ignores them (no friendly projectile fire).
                AddComponent(entity, new Health { Current = authoring.MaxHp, Max = authoring.MaxHp });
                AddBuffer<DamageEvent>(entity);
                AddComponent<Destructible>(entity);
            }
        }
    }
}