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

namespace ProjectM.Authoring
{
    /// <summary>
    /// Authoring for the baked <see cref="TrainingDummySpawner"/> singleton. Place this on a single
    /// GameObject in the gameplay subscene; at runtime the server-only
    /// <c>TrainingDummySpawnSystem</c> reads the singleton, instantiates <see cref="Count"/> dummies
    /// laid out along +X from <see cref="Origin"/> at <see cref="Spacing"/> intervals, then destroys
    /// the singleton so it fires exactly once. The entity itself carries no transform
    /// (<c>TransformUsageFlags.None</c>); only the referenced <see cref="DummyPrefab"/> needs a
    /// runtime-mutable LocalTransform (<c>TransformUsageFlags.Dynamic</c>).
    /// </summary>
    public class TrainingDummySpawnerAuthoring : MonoBehaviour
    {
        [Tooltip("Training dummy prefab to instantiate. Must carry TrainingDummyAuthoring.")]
        public GameObject DummyPrefab;

        [Min(0)]
        [Tooltip("How many dummies to spawn.")]
        public int Count = 3;

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

        [Tooltip("World-space position of the first dummy.")]
        public Vector3 Origin = new Vector3(0, 0, 8);

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

                AddComponent(entity, new TrainingDummySpawner
                {
                    Prefab = GetEntity(authoring.DummyPrefab, TransformUsageFlags.Dynamic),
                    Count = authoring.Count,
                    Spacing = authoring.Spacing,
                    Origin = authoring.Origin
                });
            }
        }
    }
}