using System.Collections;
using UnityEngine;

public class AliasModelAnimator : MonoBehaviour
{
    public AliasModel aliasModel;

    [SerializeField]
    private bool lerpMove = false;

    [SerializeField]
    [Range(1, 20)]
    private float animateFps = 10f;
    
    [SerializeField]
    private float frameNumber = 0;

    IEnumerator Start()
    {
        var meshRenderer = GetComponent<SkinnedMeshRenderer>();
        if (!meshRenderer || meshRenderer.sharedMesh == null || meshRenderer.sharedMesh.blendShapeCount == 0)
        {
            Debug.LogWarning($"Unexpected AliasModelAnimator on non-animated object '{name}'");
            Destroy(this);
            yield break;
        }

        int numFrames = aliasModel.GetAnimationFrameCount(0);

        while (true)
        {
            aliasModel.Animate(frameNumber, out Mesh mesh, out float blendWeight);
            meshRenderer.sharedMesh = mesh;
            meshRenderer.SetBlendShapeWeight(0, blendWeight);

            if (lerpMove)
            {
                yield return null;
                frameNumber = (frameNumber + Time.deltaTime * animateFps) % numFrames;
            }
            else
            {
                yield return new WaitForSeconds(1.0f / animateFps);
                frameNumber = Mathf.Floor(frameNumber + 1) % numFrames;
            }
        }
    }
}