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

namespace ProjectM.Authoring
{
    /// <summary>
    /// MC-2 — authoring for the <see cref="SpitterProjectilePrefab"/> subscene singleton. Place ONE on a GameObject in
    /// the gameplay subscene; the server EnemyAISystem Spitter pass reads it via <c>GetSingleton</c> to know which spit
    /// ghost to instantiate and the concurrent soft-cap. The referenced prefab is the EnemyProjectile ghost
    /// (EnemyProjectileAuthoring); MaxLiveProjectiles bounds the relevancy loop — a Spitter at/over the cap soft-fails
    /// its shot (no cooldown burn). The carrying entity has no transform; only the referenced prefab needs one.
    /// </summary>
    public class SpitterProjectilePrefabAuthoring : MonoBehaviour
    {
        [Tooltip("The EnemyProjectile ghost prefab that Spitters fire (must carry EnemyProjectileAuthoring + an interpolated GhostAuthoringComponent).")]
        public GameObject ProjectilePrefab;

        [Min(1), Tooltip("Max concurrent live spit projectiles across all Spitters (soft-cap; over it a Spitter soft-fails its shot).")]
        public int MaxLiveProjectiles = 24;

        private class SpitterProjectilePrefabBaker : Baker<SpitterProjectilePrefabAuthoring>
        {
            public override void Bake(SpitterProjectilePrefabAuthoring authoring)
            {
                var entity = GetEntity(authoring, TransformUsageFlags.None);
                AddComponent(entity, new SpitterProjectilePrefab
                {
                    Prefab = authoring.ProjectilePrefab != null
                        ? GetEntity(authoring.ProjectilePrefab, TransformUsageFlags.Dynamic) : Entity.Null,
                    MaxLiveProjectiles = authoring.MaxLiveProjectiles,
                });
            }
        }
    }
}