using System;
using System.Collections.Generic;
using System.Linq;
using Autodesk.Navisworks.Api;
using Autodesk.Navisworks.Api.Plugins;

namespace NavisworksTransport
{
    /// <summary>
    /// 路径点圆形标记渲染插件
    /// 使用Graphics.Circle在3D空间绘制圆形标记
    /// </summary>
    [Plugin("PathPointRenderPlugin", "NavisworksTransport", DisplayName = "路径点圆形标记渲染器")]
    public class PathPointRenderPlugin : RenderPlugin
    {
        private readonly object _lockObject = new object();
        private List<CircleMarker> _circleMarkers = new List<CircleMarker>();
        private bool _isEnabled = true;
        
        // 静态实例，用于外部访问
        private static PathPointRenderPlugin _instance;

        /// <summary>
        /// 构造函数
        /// </summary>
        public PathPointRenderPlugin()
        {
            _instance = this;
        }

        /// <summary>
        /// 获取静态实例
        /// </summary>
        public static PathPointRenderPlugin Instance => _instance;

        /// <summary>
        /// 是否启用渲染
        /// </summary>
        public bool IsEnabled
        {
            get { return _isEnabled; }
            set 
            { 
                _isEnabled = value;
                // 触发视图刷新
                if (Application.ActiveDocument?.ActiveView != null)
                {
                    Application.ActiveDocument.ActiveView.RequestDelayedRedraw(ViewRedrawRequests.Render);
                }
            }
        }

        /// <summary>
        /// 当前圆形标记数量
        /// </summary>
        public int MarkerCount
        {
            get 
            { 
                lock (_lockObject)
                {
                    return _circleMarkers.Count;
                }
            }
        }

        /// <summary>
        /// Navisworks渲染回调方法
        /// </summary>
        /// <param name="view">当前视图</param>
        /// <param name="graphics">图形上下文</param>
        public override void Render(View view, Graphics graphics)
        {            
            if (!_isEnabled) return;

            try
            {
                // 首先检查文档和模型状态
                var activeDoc = Application.ActiveDocument;
                //LogManager.WriteLog($"[文档状态] ActiveDocument: {activeDoc?.GetType().Name ?? "null"}");
                
                if (activeDoc == null)
                {
                    LogManager.WriteLog($"[文档状态] ❌ 没有活动文档，跳过渲染");
                    return;
                }
                
                if (activeDoc.Models == null || activeDoc.Models.Count == 0)
                {
                    LogManager.WriteLog($"[文档状态] ❌ 没有加载的模型，跳过渲染");
                    return;
                }
                
                //LogManager.WriteLog($"[文档状态] ✓ 文档正常，模型数量: {activeDoc.Models.Count}");
                //LogManager.WriteLog($"[Graphics状态] Graphics对象: {graphics?.GetType().Name ?? "null"}");
                //LogManager.WriteLog($"[Graphics状态] View对象: {view?.GetType().Name ?? "null"}");
                
                // 使用BeginModelContext确保正确的渲染上下文
                graphics.BeginModelContext();
                //LogManager.WriteLog($"[Graphics状态] BeginModelContext完成");


                lock (_lockObject)
                {
                    // 绘制连接线段（作为圆柱体）
                    if (_circleMarkers.Count > 1)
                    {
                        graphics.Color(Color.FromByteRGB(0, 0, 0), 1.0); // 黑色连线

                        // 定义连线的物理半径（例如：20厘米）
                        double lineRadiusInMeters = 0.2; 
                        double lineRadiusInModelUnits = lineRadiusInMeters * GetMetersToModelUnitsConversionFactor();
                        
                        for (int i = 0; i < _circleMarkers.Count - 1; i++)
                        {
                            var start = _circleMarkers[i].Center;
                            var end = _circleMarkers[i + 1].Center;
                            // 使用圆柱体来绘制具有物理尺寸的连线
                            graphics.Cylinder(start, end, lineRadiusInModelUnits);
                        }
                    }
                    
                    // 遍历所有圆形标记并根据其自身属性绘制
                    foreach (var marker in _circleMarkers)
                    {
                        // 使用标记自身存储的颜色和不透明度
                        graphics.Color(marker.Color, marker.Alpha);
                        // 使用标记自身存储的半径
                        graphics.Sphere(marker.Center, marker.Radius);
                    }
                }
                
                // 结束ModelContext
                graphics.EndModelContext();
                //LogManager.WriteLog($"[Graphics状态] EndModelContext完成");
                
                //LogManager.WriteLog($"[Graphics状态] === 3D渲染完成，如果仍看不到图形，问题可能在Graphics API兼容性 ===");
            }
            catch (Exception ex)
            {
                LogManager.WriteLog($"[圆形渲染] 渲染错误: {ex.Message}");
                LogManager.WriteLog($"[圆形渲染] 异常堆栈: {ex.StackTrace}");
            }
        }

        /// <summary>
        /// 添加球体标记
        /// </summary>
        /// <param name="center">圆心位置</param>
        /// <param name="pointType">路径点类型</param>
        /// <param name="sequenceNumber">序号</param>
        public void AddCircleMarker(Point3D center, PathPointType pointType, int sequenceNumber)
        {
            try
            {
                var marker = new CircleMarker
                 {
                     Center = center,
                     Normal = new Vector3D(0, 0, 1), // 垂直向上
                    Radius = GetRadiusForPointType(pointType),
                    Color = GetColorForPointType(pointType),
                    Alpha = 1.0, // 完全不透明
                    Filled = true, // 实心圆
                    PointType = pointType,
                    SequenceNumber = sequenceNumber,
                    CreatedTime = DateTime.Now
                };

                lock (_lockObject)
                {
                    _circleMarkers.Add(marker);
                }

                //LogManager.WriteLog($"[圆形标记] 添加圆形标记: 类型={pointType}, 序号={sequenceNumber}, 中心=({center.X:F2}, {center.Y:F2}, {center.Z:F2})");
                
                // 触发视图刷新
                RequestViewRefresh();
            }
            catch (Exception ex)
            {
                LogManager.WriteLog($"[圆形标记] 添加标记失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 移除指定位置的球体标记
        /// </summary>
        /// <param name="position">位置</param>
        /// <param name="tolerance">容差距离（米）</param>
        /// <returns>是否成功移除</returns>
        public bool RemoveMarkerAt(Point3D position, double tolerance = 1.0)
        {
            bool removed = false;
            
            try
            {
                lock (_lockObject)
                {
                    for (int i = _circleMarkers.Count - 1; i >= 0; i--)
                    {
                        var marker = _circleMarkers[i];
                        var distance = CalculateDistance(marker.Center, position);
                        
                        if (distance <= tolerance)
                        {
                            _circleMarkers.RemoveAt(i);
                            removed = true;
                            LogManager.WriteLog($"[球体标记] 移除标记: 序号={marker.SequenceNumber}, 距离={distance:F2}m");
                        }
                    }
                }

                if (removed)
                {
                    RequestViewRefresh();
                }
            }
            catch (Exception ex)
            {
                LogManager.WriteLog($"[球体标记] 移除标记失败: {ex.Message}");
            }

            return removed;
        }

        /// <summary>
        /// 清除所有球体标记
        /// </summary>
        public void ClearAllMarkers()
        {
            try
            {
                int removedCount = 0;
                
                lock (_lockObject)
                {
                    removedCount = _circleMarkers.Count;
                    _circleMarkers.Clear();
                }

                LogManager.WriteLog($"[球体标记] 清除所有标记，共移除 {removedCount} 个球体标记");
                
                if (removedCount > 0)
                {
                    RequestViewRefresh();
                }
            }
            catch (Exception ex)
            {
                LogManager.WriteLog($"[球体标记] 清除标记失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 获取所有球体标记的副本
        /// </summary>
        /// <returns>标记列表</returns>
        public List<CircleMarker> GetAllMarkers()
        {
            lock (_lockObject)
            {
                return new List<CircleMarker>(_circleMarkers);
            }
        }

        /// <summary>
        /// 根据序号更新一个已存在的球体标记
        /// </summary>
        public void UpdateMarker(int sequenceNumber, Color newColor, double newRadius)
        {
            try
            {
                lock (_lockObject)
                {
                    var markerToUpdate = _circleMarkers.FirstOrDefault(m => m.SequenceNumber == sequenceNumber);
                    if (markerToUpdate != null)
                    {
                        markerToUpdate.Color = newColor;
                        markerToUpdate.Radius = newRadius;
                        LogManager.WriteLog($"[球体标记] 更新标记: 序号={sequenceNumber}, 新颜色={newColor}, 新半径={newRadius:F2}");
                        RequestViewRefresh();
                    }
                }
            }
            catch (Exception ex)
            {
                LogManager.WriteLog($"[球体标记] 更新标记失败: {ex.Message}");
            }
        }

        #region 私有辅助方法

        /// <summary>
        /// 根据路径点类型和真实文档单位获取适当的半径
        /// 目标：路径点半径为0.5米物理尺寸，起点/终点为0.8米物理尺寸
        /// </summary>
        public double GetRadiusForPointType(PathPointType pointType)
        {
            // 基础半径（米为单位），起点和终点为0.5米，路径点为0.4米
            double baseRadiusInMeters = pointType == PathPointType.WayPoint ? 0.4 : 0.5;
            
            // 获取真实文档单位转换系数
            double metersToModelUnits = GetMetersToModelUnitsConversionFactor();
            
            // 转换为模型单位
            double radiusInModelUnits = baseRadiusInMeters * metersToModelUnits;
            
            //LogManager.WriteLog($"[半径计算] 类型={pointType}, 基础半径={baseRadiusInMeters}m, 转换系数={metersToModelUnits:F2}, 最终半径={radiusInModelUnits:F2}");
            
            return radiusInModelUnits;
        }

        /// <summary>
        /// 获取米转换为文档单位的转换系数
        /// 使用Navisworks API直接获取真实文档单位，而不是猜测
        /// </summary>
        private double GetMetersToModelUnitsConversionFactor()
        {
            try
            {
                var units = Application.ActiveDocument.Units;
                //LogManager.WriteLog($"[单位检测] API返回的文档单位: {units}");
                
                switch (units)
                {
                    case Units.Millimeters:
                        //LogManager.WriteLog("[单位检测] 确认为毫米单位，转换系数=1000");
                        return 1000.0; // 1米 = 1000毫米
                    case Units.Centimeters:
                        //LogManager.WriteLog("[单位检测] 确认为厘米单位，转换系数=100");
                        return 100.0; // 1米 = 100厘米
                    case Units.Meters:
                        //LogManager.WriteLog("[单位检测] 确认为米单位，转换系数=1");
                        return 1.0; // 1米 = 1米
                    case Units.Inches:
                        //LogManager.WriteLog("[单位检测] 确认为英寸单位，转换系数=39.37");
                        return 39.37; // 1米 = 39.37英寸
                    case Units.Feet:
                        //LogManager.WriteLog("[单位检测] 确认为英尺单位，转换系数=3.281");
                        return 3.281; // 1米 = 3.281英尺
                    case Units.Kilometers:
                        //LogManager.WriteLog("[单位检测] 确认为公里单位，转换系数=0.001");
                        return 0.001; // 1米 = 0.001公里
                    case Units.Micrometers:
                        //LogManager.WriteLog("[单位检测] 确认为微米单位，转换系数=1000000");
                        return 1000000.0; // 1米 = 1000000微米
                    case Units.Microinches:
                        //LogManager.WriteLog("[单位检测] 确认为微英寸单位，转换系数=39370078.74");
                        return 39370078.74; // 1米 = 39370078.74微英寸
                    case Units.Mils:
                        //LogManager.WriteLog("[单位检测] 确认为密尔单位，转换系数=39370.08");
                        return 39370.08; // 1米 = 39370.08密尔
                    case Units.Yards:
                        //LogManager.WriteLog("[单位检测] 确认为码单位，转换系数=1.094");
                        return 1.094; // 1米 = 1.094码
                    case Units.Miles:
                        //LogManager.WriteLog("[单位检测] 确认为英里单位，转换系数=0.000621");
                        return 0.000621; // 1米 = 0.000621英里
                    default:
                        //LogManager.WriteLog($"[单位检测] 未知单位类型: {units}，使用默认米单位，转换系数=1");
                        return 1.0;
                }
            }
            catch (Exception ex)
            {
                LogManager.WriteLog($"[单位检测] API调用失败: {ex.Message}");
                LogManager.WriteLog("[单位检测] 使用默认米单位，转换系数=1");
                return 1.0;
            }
        }

        /// <summary>
        /// 根据路径点类型获取颜色
        /// </summary>
        public Color GetColorForPointType(PathPointType pointType)
        {
            switch (pointType)
            {
                case PathPointType.StartPoint:
                    return Color.Green; // 起点绿色
                case PathPointType.EndPoint:
                    return Color.Red; // 终点红色
                case PathPointType.WayPoint:
                default:
                    return new Color(1.0, 0.0, 1.0); // 路径点洋红色RGB(1,0,1) - 高对比度避免与蓝色通道冲突
            }
        }

        /// <summary>
        /// 计算两点间距离
        /// </summary>
        private double CalculateDistance(Point3D point1, Point3D point2)
        {
            var dx = point1.X - point2.X;
            var dy = point1.Y - point2.Y;
            var dz = point1.Z - point2.Z;
            return Math.Sqrt(dx * dx + dy * dy + dz * dz);
        }

        /// <summary>
        /// 请求视图刷新
        /// </summary>
        private void RequestViewRefresh()
        {
            try
            {
                if (Application.ActiveDocument?.ActiveView != null)
                {
                    Application.ActiveDocument.ActiveView.RequestDelayedRedraw(ViewRedrawRequests.Render);
                }
            }
            catch (Exception ex)
            {
                LogManager.WriteLog($"[球体标记] 视图刷新失败: {ex.Message}");
            }
        }

        #endregion

        #region 清理资源

        /// <summary>
        /// 清理资源
        /// </summary>
        public void CleanUp()
        {
            ClearAllMarkers();
        }

        #endregion
    }

    /// <summary>
    /// 圆形标记数据结构
    /// </summary>
    public class CircleMarker
    {
        /// <summary>
        /// 圆心坐标
        /// </summary>
        public Point3D Center { get; set; }

        /// <summary>
        /// 圆面法向量
        /// </summary>
        public Vector3D Normal { get; set; }

        /// <summary>
        /// 圆形半径
        /// </summary>
        public double Radius { get; set; }

        /// <summary>
        /// 圆形颜色
        /// </summary>
        public Color Color { get; set; }

        /// <summary>
        /// 不透明度 (1.0 = 完全不透明, 0.0 = 完全透明)
        /// </summary>
        public double Alpha { get; set; }

        /// <summary>
        /// 是否填充
        /// </summary>
        public bool Filled { get; set; }

        /// <summary>
        /// 路径点类型
        /// </summary>
        public PathPointType PointType { get; set; }

        /// <summary>
        /// 序号
        /// </summary>
        public int SequenceNumber { get; set; }

        /// <summary>
        /// 创建时间
        /// </summary>
        public DateTime CreatedTime { get; set; }

        public override string ToString()
        {
            return $"CircleMarker[序号={SequenceNumber}, 类型={PointType}, 中心=({Center.X:F2},{Center.Y:F2},{Center.Z:F2}), 半径={Radius:F2}]";
        }
    }
}