using UnityEngine;
using UnityEngine.Rendering;

public class Entity
{
    private readonly int entityNum;

    private GameObject gameObject;
    private SkinnedMeshRenderer meshRenderer;
    
    private AliasModel aliasModel;
    
    public Entity(int entityNum)
    {
        this.entityNum = entityNum;
        CreateGameObject();
    }

    private void CreateGameObject()
    {
        gameObject = new GameObject($"Entity_{entityNum}");
        
        // DEBUG - we'll want to instantiate a prefab and assign materials from a preset collection
        meshRenderer = gameObject.AddComponent<SkinnedMeshRenderer>();
        meshRenderer.material = new Material(Shader.Find("Universal Render Pipeline/Simple Lit"));
        meshRenderer.shadowCastingMode = ShadowCastingMode.Off;
        meshRenderer.receiveShadows = false;
        meshRenderer.lightProbeUsage = LightProbeUsage.Off;
        meshRenderer.reflectionProbeUsage = ReflectionProbeUsage.Off;
    }

    public void Destroy()
    {
        Object.Destroy(gameObject);
    }

    public void SetAliasModel(AliasModel model)
    {
        aliasModel = model;

        // Set a default pose based on the first animation frame
        UpdateAnimation(0);    
    }

    public void UpdateAnimation(int frameNum)
    {
        if (aliasModel != null)
        {
            aliasModel.Animate(frameNum, out Mesh mesh, out float blendWeight);
            meshRenderer.sharedMesh = mesh;
            
            if (mesh.blendShapeCount > 0)
                meshRenderer.SetBlendShapeWeight(0, blendWeight);
        }
    }

    public void SetTransform(Vector3 position, Quaternion rotation)
    {
        gameObject.transform.position = position;
        gameObject.transform.rotation = rotation;
    }
}