using UnityEngine;

namespace VRSDK
{
    public class VR_Outline : MonoBehaviour
    {
        [HideInInspector]
        public float outlineActive = 0;

        public float outlineThickness = 1f;
        public Color outlineColor = new Color( 49.0f / 255.0f, 246.0f / 255.0f, 0 / 255.0f );

        private Material outlineMaterial;

        private GameObject outlineModel;
        private Material outlineModelMaterial;

        private float lastIsActive = 100;


        void Start()
        {
            outlineMaterial = Resources.Load( "OutlineMaterial" ) as Material;

            this.RefreshHighlightMesh();
        }


        void Update()
        {
            if (this.lastIsActive != this.outlineActive)
            {
                outlineModelMaterial.SetFloat( "_Alpha", this.outlineActive );
                outlineModelMaterial.SetFloat( "_Thickness", this.outlineThickness );
                outlineModelMaterial.SetColor( "_OutlineColor", (Color) this.outlineColor );
                this.lastIsActive = this.outlineActive;

                if (this.outlineActive > 0)
                {
                    this.outlineModel.SetActive( true );
                }
                else
                {
                    this.outlineModel.SetActive( false );
                }
            }
        }

        public void RefreshHighlightMesh()
        {
            if (this.outlineModel != null)
            {
                Destroy( outlineModel );
            }

            MeshFilter[] meshFilters = GetComponentsInChildren<MeshFilter>();
            CombineInstance[] combine = new CombineInstance[meshFilters.Length];
            int i = 0;
            while (i < meshFilters.Length)
            {
                combine[i].mesh = meshFilters[i].sharedMesh;
                combine[i].transform = gameObject.transform.worldToLocalMatrix * meshFilters[i].transform.localToWorldMatrix;

                i++;
            }


            this.outlineModel = new GameObject( name + "OutlineModel" );
            outlineModel.transform.SetParent( this.gameObject.transform, false );

            MeshFilter filter = outlineModel.AddComponent<MeshFilter>();
            filter.mesh = new Mesh();
            filter.mesh.CombineMeshes( combine );

            MeshRenderer renderer = outlineModel.AddComponent<MeshRenderer>();
            renderer.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
            renderer.receiveShadows = false;
            renderer.material = outlineMaterial;
            this.outlineModelMaterial = renderer.material;

            this.outlineModel.SetActive( false );
        }
    }

}