using UnityEngine;
using System.Collections;
using Module.Log;

[ExecuteInEditMode]
public class MaterialIELightTool : MonoBehaviour {

	
	// Update is called once per frame
	void Update ()
    {
        if (_Renders == null)
        {
            _Renders = GetComponentsInChildren<Renderer>();
            if (_Renders == null || _Renders.Length == 0)
            {
                LogModule.DebugLog("Not Render attach");
            }
        }

        if (_Renders != null && _Renders.Length != 0)
        {
            foreach (var render in _Renders)
            {
                UpdateLight(render);
            }
        }
    }

    private Renderer[] _Renders;

    public void UpdateLight(Renderer render)
    {
        var eyeDir = transform.position - Camera.main.transform.position;

        var lightH = render.sharedMaterial.GetFloat("_SubLightDirH");
        var lightA = render.sharedMaterial.GetFloat("_SubLightDirA");
        eyeDir.y = lightH;
        var lightDir = RotVector(eyeDir, lightA);

        render.sharedMaterial.SetFloat("_SubLightDirX", lightDir.x);
        render.sharedMaterial.SetFloat("_SubLightDirY", lightDir.y);
        render.sharedMaterial.SetFloat("_SubLightDirZ", lightDir.z);

    }

    public Vector3 RotVector(Vector3 vec, float angle)
    {
        Vector3 newVector = new Vector3(vec.x * (float)Mathf.Cos(angle) - vec.z * (float)Mathf.Sin(angle), vec.y, vec.x * (float)Mathf.Sin(angle) - vec.z * (float)Mathf.Cos(angle));
        return newVector;
    }
}