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

namespace ProjectM.Authoring
{
    /// <summary>
    /// Authoring for the baked <see cref="UpgradePickupSpawner"/> singleton (mirrors
    /// TrainingDummySpawnerAuthoring). Place on a single GameObject in the gameplay subscene; the
    /// server-only <c>UpgradePickupSpawnSystem</c> reads it, spawns <see cref="Count"/> pickups along +X
    /// from <see cref="Origin"/> at <see cref="Spacing"/> intervals, then destroys the singleton so it
    /// fires exactly once. The entity carries no transform; only the prefab needs a runtime transform.
    /// </summary>
    public class UpgradePickupSpawnerAuthoring : MonoBehaviour
    {
        [Tooltip("Upgrade pickup prefab to instantiate. Must carry UpgradePickupAuthoring.")]
        public GameObject PickupPrefab;

        [Min(0)]
        [Tooltip("How many pickups to spawn.")]
        public int Count = 2;

        [Min(0f)]
        [Tooltip("World-unit spacing between consecutive pickups along +X.")]
        public float Spacing = 3f;

        [Tooltip("World-space position of the first pickup.")]
        public Vector3 Origin = new Vector3(-4f, 0f, 6f);

        private class UpgradePickupSpawnerBaker : Baker<UpgradePickupSpawnerAuthoring>
        {
            public override void Bake(UpgradePickupSpawnerAuthoring authoring)
            {
                var entity = GetEntity(authoring, TransformUsageFlags.None);

                AddComponent(entity, new UpgradePickupSpawner
                {
                    Prefab = authoring.PickupPrefab != null
                        ? GetEntity(authoring.PickupPrefab, TransformUsageFlags.Dynamic)
                        : Entity.Null,
                    Count = authoring.Count,
                    Spacing = authoring.Spacing,
                    Origin = authoring.Origin,
                });
            }
        }
    }
}