using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using Unity.Entities;
using Unity.Transforms;
using Unity.Rendering;
using Unity.Mathematics;
using Unity.Collections;

public class Bootstrap:MonoBehaviour {
    //doesn't have to be a monobehaviour, but needs to be run before the scene starts?

    private static EntityManager entityManager;
    private static RenderMesh entityRenderer; //this can be shared by OBJECTS THAT ARE THE SAME (mesh, colour maybe?) (used to be MeshInstanceRenderer)

    private static EntityArchetype toastArchtype; //Can create an entity using the archtype, which speeds up some stuff under the hood (how/where in mem the entity is stored, so it's by it's friends and can be processed fast)

    public static Mesh mesh;

    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)] //nothing special or important here, just triggering a method to run at a specific time (startup before scene load)
    public static void Initialize() {

        //create our entity manager
        //create any archtypes we are going to be using?

        entityManager = World.Active.GetOrCreateManager<EntityManager>();
        toastArchtype = entityManager.CreateArchetype(typeof(Translation), typeof(Rotation), typeof(RenderMesh)); //TransformMatrix is not used anymore? Any entity with pos/rot/scale gets one automatically under the hood?

    }



    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
    public static void SceneStartup() {

        entityRenderer.mesh = GameObject.FindObjectOfType<MeshFilter>().mesh;
        entityRenderer.material = GameObject.FindObjectOfType<MeshRenderer>().material;

        //NativeArray<Entity> el = new NativeArray<Entity>(50, Allocator.Temp); //create an list to store the entities we are about to create
        for(int c = 0; c < 50; c++) {
            Entity e = entityManager.CreateEntity(toastArchtype); //create the entity from the archtype template (x50).  Since we create from template, we don't need to add components and then set them, just set them?

            entityManager.SetComponentData<Translation>(e, new Translation { Value = new float3(0f, 0f, 0) }); //assign some values
            entityManager.SetComponentData<Rotation>(e, new Rotation { Value = new quaternion(0, 0, 0, 1) });
            entityManager.SetSharedComponentData<RenderMesh>(e, entityRenderer); //setting this to the entityRenderer component *should* render it? Need to somehow set entityRenderer.mesh though. Not sure where the entry point is
        }
    }
}