// 定义BspTree的Unity可视化扩展

//#define SHOW_BSP_TREE_GIZOMS
#if UNITY_EDITOR // && SHOW_BSP_TREE_GIZOMS

using System.Collections.Generic;
using JNGame.Math;
using UnityEngine;

namespace JNGame.PathFinding
{
    // BspTreeNode的调试信息
    public partial class BspTreeNode
    {
        public static int s_AutoIncretID = 0;

        public int debugNodeId;
        public BspTreeNode()
        {
            debugNodeId = ++s_AutoIncretID;
        }
    }

    // BspTree的可视化绘制
    public partial class BspTree
    {
        #region Debug Gizoms
        public static Transform s_DebugTrans;
        public static Material s_DebugMat;

        public void DebugDraw()
        {
            var tran = DrawNode(m_RootNode, 0, s_DebugTrans);
            tran.transform.position += Vector3.up * 0.05f;
        }

        private Vector3 Hash13(int id)
        {
            var val = (Mathf.Sin(15741.254f * id) + 1) / 2;
            var val2 = (Mathf.Sin(7331.5147f * id) + 1) / 2;
            var val3 = (Mathf.Sin(24317.433f * id) + 1) / 2;
            return new Vector3(val, val2, val3);
        }

        private Transform DrawNode(BspTreeNode node, int depth, Transform parent)
        {
            var val = Hash13(node.debugNodeId);
            Color color = new Color(val.x, val.y, val.z, 1);
            if (node.IsLeaf)
            {
                var tran = CreateGo(node.debugNodeId.ToString(), node.tris, color).transform;
                tran.SetParent(parent, true);
                return tran;
            }
            else
            {
                var tran = CreateGo(node.debugNodeId.ToString(), node.splitLine, color).transform;
                tran.SetParent(parent, true);

                DrawNode(node.LeftChild, depth + 1, tran);
                DrawNode(node.RightChild, depth + 1, tran);
                return tran;
            }
        }

        private GameObject CreateGo(string name, in SplitLine plane, in Color color)
        {
            return new GameObject(name);
#if false
            var dir = plane.Direction.Normalized;
            var or = plane.vertexA;
            var s = or - dir * worldSize;
            var e = or + dir * worldSize;
            var perp = new LVector2(-dir.y, dir.x);
            const float lineSize = 0.3f;
            var s1 = perp * lineSize.ToLFloat() + s;
            var e1 = perp * lineSize.ToLFloat() + e;
            List<Vector3> vertices = new List<Vector3>();
            List<int> tirs = new List<int>();
            vertices.Add(s.ToVector3XZ());
            vertices.Add(e.ToVector3XZ());
            vertices.Add(e1.ToVector3XZ());
            vertices.Add(s1.ToVector3XZ());
            int triIdx = 0;
            tirs.Add(0);
            tirs.Add(1);
            tirs.Add(2);
            tirs.Add(0);
            tirs.Add(2);
            tirs.Add(3);
            return CreateGo(name, vertices, tirs, color);
#endif
        }

        private GameObject CreateGo(string name, List<TriangleRef> allRawTriangle, in Color color)
        {
            List<Vector3> vertices = new List<Vector3>();
            List<int> tirs = new List<int>();
            int triIdx = 0;
            foreach (var tri in allRawTriangle)
            {
                vertices.Add(tri.vertexA.ToVector3XZ());
                vertices.Add(tri.vertexB.ToVector3XZ());
                vertices.Add(tri.vertexC.ToVector3XZ());
                tirs.Add(triIdx++);
                tirs.Add(triIdx++);
                tirs.Add(triIdx++);
            }

            return CreateGo(name, vertices, tirs, color);
        }

        private GameObject CreateGo(string name, List<Vector3> vertices, List<int> tirs, in Color color)
        {
            var go = new GameObject(name);
            var render = go.AddComponent<MeshRenderer>();
            var mat = new Material(s_DebugMat) { color = color };
            render.material = mat;

            var tempMesh = new Mesh();
            tempMesh.vertices = vertices.ToArray();
            tempMesh.triangles = tirs.ToArray();
            go.AddComponent<MeshFilter>().mesh = tempMesh;
            return go;
        }

        #endregion
    }
}
#endif