using System.Collections.Generic;
using UnityEngine;

namespace Terkoiz.MapZoneHighlighter.BoundedBoxes
{
    public class ColliderBoundsRenderer : MonoBehaviour
    {
        private static Material _lineMaterial;
        private List<Vector3[,]> _outlines;
        private List<Color> _colors;

        private void Awake()
        {
            _outlines = new List<Vector3[,]>();
            _colors = new List<Color>();
            CreateLineMaterial();
        }

        private void Update()
        {
            _outlines = new List<Vector3[,]>();
            _colors = new List<Color>();
        }

        private static void CreateLineMaterial()
        {
            if (!_lineMaterial)
            {
                // _lineMaterial = new Material(@"
                //     Shader ""Lines/Colored Blended"" {
                //     SubShader { Pass { 
                //         Blend SrcAlpha OneMinusSrcAlpha 
                //         ZWrite Off Cull Off Fog { Mode Off } 
                //         BindChannels {
                //         Bind ""vertex"", vertex Bind ""color"", color }
                //     } } }
                // ");
                _lineMaterial = new Material(Shader.Find("Hidden/Internal-Colored"));
                _lineMaterial.hideFlags = HideFlags.HideAndDontSave;
                _lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;
            }
        }

        private void OnPostRender()
        {
            if (_outlines == null) return;
            CreateLineMaterial();
            _lineMaterial.SetPass(0);
            GL.Begin(GL.LINES);
            for (int j = 0; j < _outlines.Count; j++)
            {
                GL.Color(_colors[j]);
                for (int i = 0; i < _outlines[j].GetLength(0); i++)
                {
                    GL.Vertex(_outlines[j][i, 0]);
                    GL.Vertex(_outlines[j][i, 1]);
                }
            }

            GL.End();
        }

        public void SetOutlines(Vector3[,] newOutlines, Color newcolor)
        {
            if (newOutlines.GetLength(0) > 0)
            {
                _outlines.Add(newOutlines);
                _colors.Add(newcolor);
            }
        }
    }
}