using System;
using System.Collections.Generic;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using CadParamPluging.Common;

namespace CadParamPluging.Cad
{
    public static class BlockRawFreeForgeRoundHeadDrawer
    {
        public static void Draw(CadContext ctx, ParamBag bag, Point3d center, double scaleFactor = 1.0)
        {
            if (ctx == null) throw new ArgumentNullException(nameof(ctx));
            if (bag == null) throw new ArgumentNullException(nameof(bag));

            var effectiveBag = scaleFactor < 1.0 ? ScaleParamBag(bag, scaleFactor) : bag;

            var db = ctx.Database;
            var tr = ctx.Transaction;

            var prevDb = HostApplicationServices.WorkingDatabase;
            HostApplicationServices.WorkingDatabase = db;
            BlockTableRecord btr;
            try
            {
                var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
                btr = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
            }
            finally
            {
                HostApplicationServices.WorkingDatabase = prevDb;
            }

            var context = new FeatureDrivenDrawer.DrawingContext
            {
                Ctx = ctx,
                Bag = effectiveBag,
                OriginalBag = bag,
                Center = center,
                DeliveryStatus = "毛料态",
                StructuralFeature = "方体",
                SpecialCondition = "有圆头",
                ProcessMethod = "自由锻",
                Btr = btr,
                Style = new DrawingStyleManager(db, tr)
            };

            DrawBlockRawFreeForgeRoundHeadCore(context);
        }

        private static void DrawBlockRawFreeForgeRoundHeadCore(FeatureDrivenDrawer.DrawingContext ctx)
        {
            var bag = ctx.Bag;
            
            // BoxSize1 (Width - 总长度)
            // BoxSize2 (Height - 高度/直径)
            var width = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize1);
            var height = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize2);

            if (!width.HasValue || width.Value <= 0 || !height.HasValue || height.Value <= 0)
            {
                return;
            }

            double H = height.Value;
            double W = width.Value;
            
            // 外轮廓圆弧：高度固定为 H/5
            // 依据用户新需求 (2026-01-29): 黄色部分(圆弧高)是粉色部分(总高H)的1/5
            double arcHeight = H / 5.0;
            
            // 视觉比例：总宽度映射
            double visualTotalW = H * 3.0; // 保持视觉宽高比约 3:1
            
            // 绘图坐标计算 (保持居中)
            double ox = ctx.Center.X - visualTotalW / 2.0;  // 左边界 (圆弧最左端)
            double oy = ctx.Center.Y - H / 2.0;             // 底边

            // 内框边界（从左圆弧弦线到右圆弧弦线）
            // 注意：ox 是圆弧顶点，xInnerLeft 应该是弦线位置
            double xInnerLeft = ox + arcHeight;
            double xInnerRight = ox + visualTotalW - arcHeight;
            double innerWidth = xInnerRight - xInnerLeft;

            // 获取圆头处圆角半径 (BoxRoundHeadFilletRadiusMax) - 用于外侧圆角
            // 依据用户需求：外侧圆角由“圆头处圆角半径”控制
            var headFilletParam = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxRoundHeadFilletRadiusMax);
            double headFilletR = headFilletParam.HasValue && headFilletParam.Value > 0 
                ? headFilletParam.Value 
                : 0;

            // 获取内框圆角参数：优先取 UnspecifiedFilletRadiusMax，如果没有则取 BoxFilletRadiusMax - 用于内部剖面
            var innerFilletParam = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyUnspecifiedFilletRadiusMax);
            if (!innerFilletParam.HasValue || innerFilletParam.Value <= 0)
            {
                innerFilletParam = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxFilletRadiusMax);
            }

            double sectionFilletR = innerFilletParam.HasValue && innerFilletParam.Value > 0 
                ? innerFilletParam.Value 
                : 0;

            // 2. 绘制分段式内框（左、中、右三段）以支持中间剖面区域的独立圆角
            // 中间区域（剖面）作为主体，如果设置了圆角，四个角都应为圆角
            
            // 计算视觉上的剖面宽度
            // 依据用户需求：尺寸3 (BoxSize3) 对应剖面的宽
            var size3 = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize3);
            double visualSectionWidth;
            
            if (size3.HasValue && size3.Value > 0)
            {
                // 按比例映射：VisualW / PhysicalW
                double scale = visualTotalW / W;
                visualSectionWidth = size3.Value * scale;
                
                // 限制最大宽度，防止出错
                if (visualSectionWidth > innerWidth * 0.95)
                {
                    visualSectionWidth = innerWidth * 0.95;
                }
            }
            else
            {
                // 降级策略
                visualSectionWidth = innerWidth / 3.0;
            }

            // 居中布置剖面
            double sectionOffset = (innerWidth - visualSectionWidth) / 2.0;
            double xSectionLeft = xInnerLeft + sectionOffset;
            double xSectionRight = xSectionLeft + visualSectionWidth;

            // 绘制中间剖面框（带圆角）
            // 使用 sectionFilletR
            DrawBoxSectionContourWithFillet(ctx, xSectionLeft, xSectionRight, oy, H, sectionFilletR);

            // Calculate effective head fillet R (clamped by side frame width)
            double sideFrameWidth = xSectionLeft - xInnerLeft;
            double maxR = Math.Min(sideFrameWidth * 0.5, H * 0.5);
            double effectiveHeadR = Math.Min(headFilletR, maxR);

            double Rm = (H * H) / (8.0 * arcHeight) + arcHeight / 2.0;
            double D_tangent = (Rm >= effectiveHeadR) ? Math.Sqrt(Math.Max(0, (Rm - effectiveHeadR) * (Rm - effectiveHeadR) - (H / 2.0 - effectiveHeadR) * (H / 2.0 - effectiveHeadR))) : (Rm - arcHeight);
            
            double xf_left = effectiveHeadR > 0 ? (xInnerLeft + Rm - arcHeight) - D_tangent : xInnerLeft;
            double xf_right = effectiveHeadR > 0 ? (xInnerRight - Rm + arcHeight) + D_tangent : xInnerRight;

            double xc_left = xInnerLeft + Rm - arcHeight;
            double fx_L_tang = effectiveHeadR > 0 ? xc_left + (Rm / (Rm - effectiveHeadR)) * (xf_left - xc_left) : xInnerLeft;
            double fy_L_tangBot = effectiveHeadR > 0 ? (oy + H / 2.0) + (Rm / (Rm - effectiveHeadR)) * ((oy + effectiveHeadR) - (oy + H / 2.0)) : oy;

            double xc_right = xInnerRight - Rm + arcHeight;
            double fx_R_tang = effectiveHeadR > 0 ? xc_right + (Rm / (Rm - effectiveHeadR)) * (xf_right - xc_right) : xInnerRight;
            double fy_R_tangBot = effectiveHeadR > 0 ? (oy + H / 2.0) + (Rm / (Rm - effectiveHeadR)) * ((oy + effectiveHeadR) - (oy + H / 2.0)) : oy;

            // 绘制左侧框线（只画横向连接线）
            DrawBoxSideFrame(ctx, xf_left, xSectionLeft + sectionFilletR, oy, H, 0, isLeft: true);

            // 绘制右侧框线（只画横向连接线）
            DrawBoxSideFrame(ctx, xSectionRight - sectionFilletR, xf_right, oy, H, 0, isLeft: false);

            // 1. 绘制完整锻件外轮廓（方体有圆头 - 白色，大圆弧及外侧平滑过渡圆角）
            DrawBlockRoundHeadOutline(ctx, ox, oy, visualTotalW, H, arcHeight, effectiveHeadR, xf_left, xf_right);

            // 绘制圆角的斜向标注（如果存在圆角）：4-R<=*
            if (effectiveHeadR > 0)
            {
                // 左上角
                double yTop = oy + H;
                double cxLeft = xf_left;
                double cyLeft = yTop - effectiveHeadR;
                DrawHeadFilletRadiusLeader(ctx, cxLeft, cyLeft, effectiveHeadR, true);

                // 根据需求，左右都标注了的话，只保留一个（左上角），去除右上角标注
                // 右上角
                // double cxRight = xInnerRight - effectiveHeadR;
                // DrawHeadFilletRadiusLeader(ctx, cxRight, cyLeft, effectiveHeadR, false);
            }

            // 3. 剖面填充 - 只在中间区域
            // 使用 sectionFilletR
            if (sectionFilletR > 0.01)
            {
                DrawRingSectionHatchWithFillet(ctx, xSectionLeft, xSectionRight, oy, H, sectionFilletR);
            }
            else
            {
                DrawBlockSectionHatch(ctx, xSectionLeft, xSectionRight, oy, H);
            }

            // 5. 零件轮廓框（黄色双点划线矩形 - 在内框内，与锻件有一定间距）
            var widthPrime = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize1Prime);
            var heightPrime = bag.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize2Prime);
            if (widthPrime.HasValue && widthPrime.Value > 0 && heightPrime.HasValue && heightPrime.Value > 0)
            {
                double partH = heightPrime.Value;
                double partW = widthPrime.Value;
                
                // 计算零件在视觉上的宽度比例
                double partWidthRatio = partW / W;
                double visualPartW = innerWidth * partWidthRatio;
                if (visualPartW > innerWidth) visualPartW = innerWidth * 0.9;
                
                // 零件在锻件内居中
                double partOffsetX = (innerWidth - visualPartW) / 2.0;
                double partOffsetY = (H - partH) / 2.0;
                
                double xPartLeft = xInnerLeft + partOffsetX;
                double yPartBottom = oy + partOffsetY;
                
                DrawBlockPartContour(ctx, xPartLeft, yPartBottom, visualPartW, partH);
            }

            // 6. 宽度标注 (BoxSize1) - 位于底部
            // 标注从锻件最左端到最右端 (BoxSize1 对应 锻件总宽)
            {
                var val = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize1) ?? W;
                var str = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize1);
                var tolPlus = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize1TolPlus);
                var tolMinus = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize1TolMinus);
                var tolPlusStr = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize1TolPlus);
                var tolMinusStr = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize1TolMinus);

                var dimText = FeatureDrivenDrawer.BuildDimensionText(FeatureDrivenDrawer.FormatDimNumber(val, str), tolPlus, tolMinus, tolPlusStr, tolMinusStr);

                // 添加零件尺寸 (Prime) 到下方，用括号包裹
                var valPrime = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize1Prime);
                if (valPrime.HasValue && valPrime.Value > 0)
                {
                    dimText += $"\\X({FeatureDrivenDrawer.FormatDimNumber(valPrime.Value, null)})";
                }

                // 修正：标注需涵盖内框宽度 (矩形部分)
                
                // 修正：引线起点改为内框边界 (xInnerLeft/Right) 和高度底部上移圆角半径，确保闭合到白色线框
                // 修正：引线起点严格匹配倒角与圆弧相切处的极限点坐标 (fx_L_tang, fy_L_tangBot)
                AddLinearDim(
                    ctx,
                    new Point3d(fx_L_tang, fy_L_tangBot, 0),
                    new Point3d(fx_R_tang, fy_R_tangBot, 0),
                    new Point3d((fx_L_tang + fx_R_tang) / 2, oy - 25, 0),
                    0,
                    dimText);
            }

            // 7. 高度标注 (BoxSize2) - 位于右侧
            // 标注从锻件顶部到底部
            {
                var val = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize2) ?? H;
                var str = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize2);
                var tolPlus = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize2TolPlus);
                var tolMinus = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize2TolMinus);
                var tolPlusStr = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize2TolPlus);
                var tolMinusStr = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize2TolMinus);

                var dimText = FeatureDrivenDrawer.BuildDimensionText(FeatureDrivenDrawer.FormatDimNumber(val, str), tolPlus, tolMinus, tolPlusStr, tolMinusStr);
                
                // 添加零件尺寸 (Prime) 到下方
                var valPrime = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize2Prime);
                if (valPrime.HasValue && valPrime.Value > 0)
                {
                     dimText += $"\\X({FeatureDrivenDrawer.FormatDimNumber(valPrime.Value, null)})";
                }

                // 标注从圆弧最外侧开始（避免与圆弧轮廓线重叠）
                double xOuterRight = ox + visualTotalW;
                // 修正：标注界线起点应从圆弧顶端开始，往内缩进一个圆弧高度 arcHeight + headFilletR，定位在弦线上
                double xDimOrigin = xOuterRight - (arcHeight + headFilletR);

                AddLinearDim(
                    ctx,
                    new Point3d(xDimOrigin, oy, 0),
                    new Point3d(xDimOrigin, oy + H, 0),
                    new Point3d(xOuterRight + 20, oy + H / 2, 0),
                    90,
                    dimText);
            }

            // 8. 中间矩形宽度标注 (BoxSize3) - 位于上方
            // 对应剖面区域宽度
            {
                var val = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize3) ?? 0;
                var str = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize3);
                
                // 只有当有值时才标注
                if (val > 0)
                {
                    var tolPlus = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize3TolPlus);
                    var tolMinus = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize3TolMinus);
                    var tolPlusStr = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize3TolPlus);
                    var tolMinusStr = ctx.OriginalBag?.GetString(FeatureDrivenDrawer.KeyBoxSize3TolMinus);

                    var dimText = FeatureDrivenDrawer.BuildDimensionText(FeatureDrivenDrawer.FormatDimNumber(val, str), tolPlus, tolMinus, tolPlusStr, tolMinusStr);

                    // 添加零件尺寸 (Prime) 到下方
                    var valPrime = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxSize3Prime);
                    if (valPrime.HasValue && valPrime.Value > 0)
                    {
                        dimText += $"\\X({FeatureDrivenDrawer.FormatDimNumber(valPrime.Value, null)})";
                    }

                    // 修正：引线向下延伸 sectionFilletR，以接触直边
                    // sectionFilletR 是剖面处的圆角半径
                    double dimYStart = oy + H - sectionFilletR;
                    AddLinearDim(
                        ctx,
                        new Point3d(xSectionLeft, dimYStart, 0),
                        new Point3d(xSectionRight, dimYStart, 0),
                        new Point3d((xSectionLeft + xSectionRight) / 2, oy + H + 15, 0),
                        0,
                        dimText);
                }
            }

            // 9. 硬度符号 - 从剖面右侧引出
            var hardnessVal = bag.GetString(FeatureDrivenDrawer.KeyHardness);
            if (!string.IsNullOrWhiteSpace(hardnessVal) && hardnessVal != "空")
            {
                double xStart = xSectionRight;
                double yStart = oy + H * 0.25;
                FeatureDrivenDrawer.DrawHardnessSymbol(ctx, xStart, yStart, hardnessVal);
            }

            // 10. 标刻内容引线 - 从剖面左侧引出
            var markingText = bag.GetString(FeatureDrivenDrawer.KeyMarkingContent);
            if (!string.IsNullOrWhiteSpace(markingText))
            {
                double xTarget = xSectionLeft;
                double yTarget = oy + H * 0.75;
                DrawSpecialHBLeaderToTop(ctx, xTarget, yTarget, markingText);
            }
        }

        private static void DrawBlockRoundHeadOutline(FeatureDrivenDrawer.DrawingContext ctx, double ox, double oy, double totalWidth, double height, double arcHeight, double innerFilletR, double xf_left, double xf_right)
        {
            try
            {
                double H = height;
                double r = innerFilletR;
                double w = arcHeight;
                if (w < 0.1) return;

                double Rm = (H * H) / (8.0 * w) + w / 2.0;

                // Left side
                double xInnerLeft = ox + w;
                double xc_left = xInnerLeft + Rm - w;

                Point2d C_m_L = new Point2d(xc_left, oy + H / 2.0);
                Point2d C_fTop_L = new Point2d(xf_left, oy + H - r);
                Point2d C_fBot_L = new Point2d(xf_left, oy + r);

                double fx_L_tangTop = r > 0 ? C_m_L.X + (Rm / (Rm - r)) * (C_fTop_L.X - C_m_L.X) : xInnerLeft;
                double fy_L_tangTop = r > 0 ? C_m_L.Y + (Rm / (Rm - r)) * (C_fTop_L.Y - C_m_L.Y) : oy + H;
                
                double fx_L_tangBot = r > 0 ? C_m_L.X + (Rm / (Rm - r)) * (C_fBot_L.X - C_m_L.X) : xInnerLeft;
                double fy_L_tangBot = r > 0 ? C_m_L.Y + (Rm / (Rm - r)) * (C_fBot_L.Y - C_m_L.Y) : oy;

                var leftPoly = new Polyline();
                if (r > 0.01)
                {
                    double angTop1 = Math.PI / 2.0;
                    double angTop2 = Math.Atan2(fy_L_tangTop - C_fTop_L.Y, fx_L_tangTop - C_fTop_L.X);
                    double diffTop = angTop2 - angTop1;
                    while (diffTop < 0) diffTop += Math.PI * 2;
                    while (diffTop >= Math.PI * 2) diffTop -= Math.PI * 2;
                    double bulgeTop = Math.Tan(diffTop / 4.0);

                    double angM1 = Math.Atan2(fy_L_tangTop - C_m_L.Y, fx_L_tangTop - C_m_L.X);
                    double angM2 = Math.Atan2(fy_L_tangBot - C_m_L.Y, fx_L_tangBot - C_m_L.X);
                    double diffM = angM2 - angM1;
                    while (diffM < 0) diffM += Math.PI * 2;
                    while (diffM >= Math.PI * 2) diffM -= Math.PI * 2;
                    double bulgeM = Math.Tan(diffM / 4.0);

                    double angBot1 = Math.Atan2(fy_L_tangBot - C_fBot_L.Y, fx_L_tangBot - C_fBot_L.X);
                    double angBot2 = -Math.PI / 2.0;
                    double diffBot = angBot2 - angBot1;
                    while (diffBot < 0) diffBot += Math.PI * 2;
                    while (diffBot >= Math.PI * 2) diffBot -= Math.PI * 2;
                    double bulgeBot = Math.Tan(diffBot / 4.0);

                    leftPoly.AddVertexAt(0, new Point2d(xf_left, oy + H), bulgeTop, 0, 0);
                    leftPoly.AddVertexAt(1, new Point2d(fx_L_tangTop, fy_L_tangTop), bulgeM, 0, 0);
                    leftPoly.AddVertexAt(2, new Point2d(fx_L_tangBot, fy_L_tangBot), bulgeBot, 0, 0);
                    leftPoly.AddVertexAt(3, new Point2d(xf_left, oy), 0, 0, 0);
                }
                else
                {
                    double angM1 = Math.Atan2(oy + H - C_m_L.Y, xInnerLeft - C_m_L.X);
                    double angM2 = Math.Atan2(oy - C_m_L.Y, xInnerLeft - C_m_L.X);
                    double diffM = angM2 - angM1;
                    while (diffM < 0) diffM += Math.PI * 2;
                    while (diffM >= Math.PI * 2) diffM -= Math.PI * 2;
                    double bulgeM = Math.Tan(diffM / 4.0);

                    leftPoly.AddVertexAt(0, new Point2d(xInnerLeft, oy + H), bulgeM, 0, 0);
                    leftPoly.AddVertexAt(1, new Point2d(xInnerLeft, oy), 0, 0, 0);
                }

                ctx.Style?.Apply(leftPoly, DrawingStyleManager.Role.OutlineBold);
                ctx.Btr.AppendEntity(leftPoly);
                ctx.Tr.AddNewlyCreatedDBObject(leftPoly, true);

                var leftClosureLine = new Line(new Point3d(fx_L_tangTop, fy_L_tangTop, 0), new Point3d(fx_L_tangBot, fy_L_tangBot, 0));
                ctx.Style?.Apply(leftClosureLine, DrawingStyleManager.Role.OutlineBold);
                ctx.Btr.AppendEntity(leftClosureLine);
                ctx.Tr.AddNewlyCreatedDBObject(leftClosureLine, true);

                // Right side
                double xInnerRight = ox + totalWidth - w;
                double xc_right = xInnerRight - Rm + w;

                Point2d C_m_R = new Point2d(xc_right, oy + H / 2.0);
                Point2d C_fTop_R = new Point2d(xf_right, oy + H - r);
                Point2d C_fBot_R = new Point2d(xf_right, oy + r);

                double fx_R_tangTop = r > 0 ? C_m_R.X + (Rm / (Rm - r)) * (C_fTop_R.X - C_m_R.X) : xInnerRight;
                double fy_R_tangTop = r > 0 ? C_m_R.Y + (Rm / (Rm - r)) * (C_fTop_R.Y - C_m_R.Y) : oy + H;
                
                double fx_R_tangBot = r > 0 ? C_m_R.X + (Rm / (Rm - r)) * (C_fBot_R.X - C_m_R.X) : xInnerRight;
                double fy_R_tangBot = r > 0 ? C_m_R.Y + (Rm / (Rm - r)) * (C_fBot_R.Y - C_m_R.Y) : oy;

                var rightPoly = new Polyline();
                if (r > 0.01)
                {
                    double angBot1 = -Math.PI / 2.0;
                    double angBot2 = Math.Atan2(fy_R_tangBot - C_fBot_R.Y, fx_R_tangBot - C_fBot_R.X);
                    double diffBot = angBot2 - angBot1;
                    while (diffBot < 0) diffBot += Math.PI * 2;
                    while (diffBot >= Math.PI * 2) diffBot -= Math.PI * 2;
                    double bulgeBot = Math.Tan(diffBot / 4.0);

                    double angM1 = Math.Atan2(fy_R_tangBot - C_m_R.Y, fx_R_tangBot - C_m_R.X);
                    double angM2 = Math.Atan2(fy_R_tangTop - C_m_R.Y, fx_R_tangTop - C_m_R.X);
                    double diffM = angM2 - angM1;
                    while (diffM < 0) diffM += Math.PI * 2;
                    while (diffM >= Math.PI * 2) diffM -= Math.PI * 2;
                    double bulgeM = Math.Tan(diffM / 4.0);

                    double angTop1 = Math.Atan2(fy_R_tangTop - C_fTop_R.Y, fx_R_tangTop - C_fTop_R.X);
                    double angTop2 = Math.PI / 2.0;
                    double diffTop = angTop2 - angTop1;
                    while (diffTop < 0) diffTop += Math.PI * 2;
                    while (diffTop >= Math.PI * 2) diffTop -= Math.PI * 2;
                    double bulgeTop = Math.Tan(diffTop / 4.0);

                    rightPoly.AddVertexAt(0, new Point2d(xf_right, oy), bulgeBot, 0, 0);
                    rightPoly.AddVertexAt(1, new Point2d(fx_R_tangBot, fy_R_tangBot), bulgeM, 0, 0);
                    rightPoly.AddVertexAt(2, new Point2d(fx_R_tangTop, fy_R_tangTop), bulgeTop, 0, 0);
                    rightPoly.AddVertexAt(3, new Point2d(xf_right, oy + H), 0, 0, 0);
                }
                else
                {
                    double angM1 = Math.Atan2(oy - C_m_R.Y, xInnerRight - C_m_R.X);
                    double angM2 = Math.Atan2(oy + H - C_m_R.Y, xInnerRight - C_m_R.X);
                    double diffM = angM2 - angM1;
                    while (diffM < 0) diffM += Math.PI * 2;
                    while (diffM >= Math.PI * 2) diffM -= Math.PI * 2;
                    double bulgeM = Math.Tan(diffM / 4.0);

                    rightPoly.AddVertexAt(0, new Point2d(xInnerRight, oy), bulgeM, 0, 0);
                    rightPoly.AddVertexAt(1, new Point2d(xInnerRight, oy + H), 0, 0, 0);
                }

                ctx.Style?.Apply(rightPoly, DrawingStyleManager.Role.OutlineBold);
                ctx.Btr.AppendEntity(rightPoly);
                ctx.Tr.AddNewlyCreatedDBObject(rightPoly, true);

                var rightClosureLine = new Line(new Point3d(fx_R_tangTop, fy_R_tangTop, 0), new Point3d(fx_R_tangBot, fy_R_tangBot, 0));
                ctx.Style?.Apply(rightClosureLine, DrawingStyleManager.Role.OutlineBold);
                ctx.Btr.AppendEntity(rightClosureLine);
                ctx.Tr.AddNewlyCreatedDBObject(rightClosureLine, true);
            }
            catch { }
        }

        private static void DrawBoxSectionContourWithFillet(FeatureDrivenDrawer.DrawingContext ctx, double xLeft, double xRight, double yBottom, double height, double filletR)
        {
            var yTop = yBottom + height;
            var width = xRight - xLeft;
            
            var maxR = Math.Min(width * 0.5, height * 0.5);
            var r = Math.Min(filletR, maxR);
            
            if (r <= 0.01)
            {
                var poly = new Polyline();
                poly.AddVertexAt(0, new Point2d(xLeft, yBottom), 0, 0, 0);
                poly.AddVertexAt(1, new Point2d(xRight, yBottom), 0, 0, 0);
                poly.AddVertexAt(2, new Point2d(xRight, yTop), 0, 0, 0);
                poly.AddVertexAt(3, new Point2d(xLeft, yTop), 0, 0, 0);
                poly.Closed = true;
                
                ctx.Style?.Apply(poly, DrawingStyleManager.Role.OutlineBold);
                ctx.Btr.AppendEntity(poly);
                ctx.Tr.AddNewlyCreatedDBObject(poly, true);
                return;
            }

            var bulge = Math.Tan(Math.PI / 8.0);

            var polyFillet = new Polyline();
            
            polyFillet.AddVertexAt(0, new Point2d(xLeft + r, yBottom), 0, 0, 0);
            polyFillet.AddVertexAt(1, new Point2d(xRight - r, yBottom), bulge, 0, 0); 
            polyFillet.AddVertexAt(2, new Point2d(xRight, yBottom + r), 0, 0, 0);
            polyFillet.AddVertexAt(3, new Point2d(xRight, yTop - r), bulge, 0, 0);
            polyFillet.AddVertexAt(4, new Point2d(xRight - r, yTop), 0, 0, 0);
            polyFillet.AddVertexAt(5, new Point2d(xLeft + r, yTop), bulge, 0, 0);
            polyFillet.AddVertexAt(6, new Point2d(xLeft, yTop - r), 0, 0, 0);
            polyFillet.AddVertexAt(7, new Point2d(xLeft, yBottom + r), bulge, 0, 0);
            
            polyFillet.Closed = true;

            ctx.Style?.Apply(polyFillet, DrawingStyleManager.Role.OutlineBold);
            ctx.Btr.AppendEntity(polyFillet);
            ctx.Tr.AddNewlyCreatedDBObject(polyFillet, true);
        }

        private static void DrawBoxSideFrame(FeatureDrivenDrawer.DrawingContext ctx, double xStart, double xEnd, double yBottom, double height, double filletR, bool isLeft)
        {
            var yTop = yBottom + height;
            var width = Math.Abs(xEnd - xStart);
            if (width < 0.1) return;

            var topPoly = new Polyline();
            topPoly.AddVertexAt(0, new Point2d(xStart, yTop), 0, 0, 0);
            topPoly.AddVertexAt(1, new Point2d(xEnd, yTop), 0, 0, 0);
            
            ctx.Style?.Apply(topPoly, DrawingStyleManager.Role.OutlineBold);
            ctx.Btr.AppendEntity(topPoly);
            ctx.Tr.AddNewlyCreatedDBObject(topPoly, true);

            var botPoly = new Polyline();
            botPoly.AddVertexAt(0, new Point2d(xStart, yBottom), 0, 0, 0);
            botPoly.AddVertexAt(1, new Point2d(xEnd, yBottom), 0, 0, 0);

            ctx.Style?.Apply(botPoly, DrawingStyleManager.Role.OutlineBold);
            ctx.Btr.AppendEntity(botPoly);
            ctx.Tr.AddNewlyCreatedDBObject(botPoly, true);
        }

        private static void DrawRingSectionHatchWithFillet(FeatureDrivenDrawer.DrawingContext ctx, double xInnerRight, double xOuterRight, double yBottom, double height, double filletR)
        {
            if (xOuterRight <= xInnerRight)
            {
                return;
            }

            var availableWidth = xOuterRight - xInnerRight;
            var maxR = Math.Min(availableWidth * 0.5, height * 0.5);
            var r = Math.Min(filletR, maxR);
            if (r <= 0.01)
            {
                DrawBlockSectionHatch(ctx, xInnerRight, xOuterRight, yBottom, height);
                return;
            }

            try
            {
                var yTop = yBottom + height;
                var bulge = Math.Tan(Math.PI / 8.0);

                var boundary = new Polyline();
                boundary.AddVertexAt(0, new Point2d(xInnerRight + r, yBottom), 0, 0, 0);
                boundary.AddVertexAt(1, new Point2d(xOuterRight - r, yBottom), bulge, 0, 0);
                boundary.AddVertexAt(2, new Point2d(xOuterRight, yBottom + r), 0, 0, 0);
                boundary.AddVertexAt(3, new Point2d(xOuterRight, yTop - r), bulge, 0, 0);
                boundary.AddVertexAt(4, new Point2d(xOuterRight - r, yTop), 0, 0, 0);
                boundary.AddVertexAt(5, new Point2d(xInnerRight + r, yTop), bulge, 0, 0);
                boundary.AddVertexAt(6, new Point2d(xInnerRight, yTop - r), 0, 0, 0);
                boundary.AddVertexAt(7, new Point2d(xInnerRight, yBottom + r), bulge, 0, 0);
                boundary.Closed = true;

                ctx.Btr.AppendEntity(boundary);
                ctx.Tr.AddNewlyCreatedDBObject(boundary, true);

                var hatch = new Hatch();
                hatch.SetDatabaseDefaults();
                hatch.Normal = new Vector3d(0, 0, 1);
                hatch.Elevation = 0.0;

                ctx.Btr.AppendEntity(hatch);
                ctx.Tr.AddNewlyCreatedDBObject(hatch, true);

                hatch.SetHatchPattern(HatchPatternType.PreDefined, "ANSI31");
                hatch.PatternScale = 10;
                hatch.PatternAngle = 0;
                hatch.Associative = false;
                ctx.Style?.Apply(hatch, DrawingStyleManager.Role.Hatch);

                var ids = new ObjectIdCollection();
                ids.Add(boundary.ObjectId);
                hatch.AppendLoop(HatchLoopTypes.External, ids);
                hatch.EvaluateHatch(true);

                try
                {
                    boundary.Erase(true);
                }
                catch { }
            }
            catch { }
        }

        private static void DrawBlockSectionHatch(FeatureDrivenDrawer.DrawingContext ctx, double xLeft, double xRight, double yBottom, double height)
        {
            if (xRight <= xLeft)
            {
                return;
            }

            try
            {
                var boundary = new Polyline();
                boundary.AddVertexAt(0, new Point2d(xLeft, yBottom), 0, 0, 0);
                boundary.AddVertexAt(1, new Point2d(xRight, yBottom), 0, 0, 0);
                boundary.AddVertexAt(2, new Point2d(xRight, yBottom + height), 0, 0, 0);
                boundary.AddVertexAt(3, new Point2d(xLeft, yBottom + height), 0, 0, 0);
                boundary.Closed = true;
                ctx.Btr.AppendEntity(boundary);
                ctx.Tr.AddNewlyCreatedDBObject(boundary, true);

                var hatch = new Hatch();
                hatch.SetDatabaseDefaults();
                hatch.Normal = new Vector3d(0, 0, 1);
                hatch.Elevation = 0.0;

                ctx.Btr.AppendEntity(hatch);
                ctx.Tr.AddNewlyCreatedDBObject(hatch, true);

                hatch.SetHatchPattern(HatchPatternType.PreDefined, "ANSI31");
                hatch.PatternScale = 10;
                hatch.PatternAngle = 0;
                hatch.Associative = false;
                ctx.Style?.Apply(hatch, DrawingStyleManager.Role.Hatch);

                var ids = new ObjectIdCollection();
                ids.Add(boundary.ObjectId);
                hatch.AppendLoop(HatchLoopTypes.External, ids);
                hatch.EvaluateHatch(true);

                try
                {
                    boundary.Erase(true);
                }
                catch { }
            }
            catch { }
        }

        private static void DrawBlockPartContour(FeatureDrivenDrawer.DrawingContext ctx, double x, double y, double width, double height)
        {
            try
            {
                var poly = new Polyline();
                poly.AddVertexAt(0, new Point2d(x, y), 0, 0, 0);
                poly.AddVertexAt(1, new Point2d(x + width, y), 0, 0, 0);
                poly.AddVertexAt(2, new Point2d(x + width, y + height), 0, 0, 0);
                poly.AddVertexAt(3, new Point2d(x, y + height), 0, 0, 0);
                poly.Closed = true;
                
                ctx.Style?.Apply(poly, DrawingStyleManager.Role.PartContour);
                ctx.Btr.AppendEntity(poly);
                ctx.Tr.AddNewlyCreatedDBObject(poly, true);
            }
            catch { }
        }

        private static void DrawHeadFilletRadiusLeader(FeatureDrivenDrawer.DrawingContext ctx, double cx, double cy, double r, bool isLeftSection)
        {
            try
            {
                var val = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyBoxRoundHeadFilletRadiusMax);
                if (!val.HasValue || val.Value <= 0) return;

                // 左上角向左上(135)，右上角向右上(45)
                double angleDeg = isLeftSection ? 135 : 45;
                double angleRad = angleDeg * Math.PI / 180.0;
                
                // 起点（外圆角，引线从圆弧表面引出）
                double px = cx + r * Math.Cos(angleRad);
                double py = cy + r * Math.Sin(angleRad);

                // 终点
                double ex = px + 25 * Math.Cos(angleRad);
                double ey = py + 25 * Math.Sin(angleRad);

                // 画直线
                var line = new Line(new Point3d(px, py, 0), new Point3d(ex, ey, 0));
                ctx.Style?.Apply(line, DrawingStyleManager.Role.Dimension);
                line.ColorIndex = 4; // Cyan
                ctx.Btr.AppendEntity(line);
                ctx.Tr.AddNewlyCreatedDBObject(line, true);

                // 绘制实心箭头
                double arrowLength = 5.0; // 箭头长度，加长
                double arrowWidth = 1.5;  // 箭头宽度，加宽
                double baseX = px + arrowLength * Math.Cos(angleRad);
                double baseY = py + arrowLength * Math.Sin(angleRad);
                
                double perpAngle = angleRad + Math.PI / 2;
                double p1X = baseX + (arrowWidth / 2) * Math.Cos(perpAngle);
                double p1Y = baseY + (arrowWidth / 2) * Math.Sin(perpAngle);
                double p2X = baseX - (arrowWidth / 2) * Math.Cos(perpAngle);
                double p2Y = baseY - (arrowWidth / 2) * Math.Sin(perpAngle);
                
                var arrow = new Solid(new Point3d(px, py, 0), new Point3d(p1X, p1Y, 0), new Point3d(p2X, p2Y, 0));
                arrow.ColorIndex = 4;
                ctx.Btr.AppendEntity(arrow);
                ctx.Tr.AddNewlyCreatedDBObject(arrow, true);

                // 文字（与线对齐）
                var textStr = $"4-R\\U+2264{val.Value}";
                var text = new DBText();
                text.TextString = textStr;
                text.Height = 3.5;
                text.ColorIndex = 4; // Cyan
                
                // 倾斜文字角度
                double textRotation = angleRad;
                if (isLeftSection)
                {
                    // 左侧角度是 135，文字应该 -45度(减去180)保证从左向右读
                    textRotation = angleRad - Math.PI; 
                }
                text.Rotation = textRotation; 
                
                // 对齐设置
                text.HorizontalMode = TextHorizontalMode.TextCenter;
                text.VerticalMode = TextVerticalMode.TextBottom;
                
                // 计算文字放置点，紧贴在线端上方
                double offsetX = 2.0 * Math.Cos(textRotation + Math.PI / 2);
                double offsetY = 2.0 * Math.Sin(textRotation + Math.PI / 2);
                
                var tp = new Point3d(ex + offsetX, ey + offsetY, 0);
                text.AlignmentPoint = tp;
                text.Position = tp;

                ctx.Style?.Apply(text, DrawingStyleManager.Role.Text);
                text.ColorIndex = 4;

                ctx.Btr.AppendEntity(text);
                ctx.Tr.AddNewlyCreatedDBObject(text, true);
            }
            catch
            {
                // ignore
            }
        }

        private static void DrawSpecialHBLeaderToTop(FeatureDrivenDrawer.DrawingContext ctx, double xTarget, double yTarget, string textContent)
        {
            try
            {
                var p1 = new Point3d(xTarget, yTarget, 0);
                var p2 = new Point3d(xTarget - 10, yTarget + 10, 0);
                
                double textLen = (string.IsNullOrEmpty(textContent) ? 10 : textContent.Length) * 2.5; 
                if (textLen < 20) textLen = 20; 

                var p3 = new Point3d(p2.X - textLen, p2.Y, 0);

                var leader = new Leader();
                leader.SetDatabaseDefaults();
                leader.AppendVertex(p1);
                leader.AppendVertex(p2);
                leader.AppendVertex(p3);
                leader.HasArrowHead = true;
                leader.ColorIndex = 7; // 白色
                leader.Layer = "0";

                ctx.Btr.AppendEntity(leader);
                ctx.Tr.AddNewlyCreatedDBObject(leader, true);

                var text = new DBText();
                text.TextString = textContent;
                text.Height = 3.5;
                text.ColorIndex = 7; 
                text.Layer = "0";
                
                text.HorizontalMode = TextHorizontalMode.TextLeft;
                text.VerticalMode = TextVerticalMode.TextBottom;
                text.AlignmentPoint = new Point3d(p3.X, p3.Y + 1.0, 0); 
                text.Position = text.AlignmentPoint;

                ctx.Btr.AppendEntity(text);
                ctx.Tr.AddNewlyCreatedDBObject(text, true);
            }
            catch { }
        }

        private static void AddLinearDim(FeatureDrivenDrawer.DrawingContext ctx, Point3d pt1, Point3d pt2, Point3d dimLinePt, 
            double rotationDeg, string textOverride, Action<Dimension, FeatureDrivenDrawer.DrawingContext> customizer = null)
        {
            try
            {
                var prevDb = HostApplicationServices.WorkingDatabase;
                HostApplicationServices.WorkingDatabase = ctx.Db;
                try
                {
                    double rotRad = rotationDeg * Math.PI / 180.0;
                    var dim = new RotatedDimension(rotRad, pt1, pt2, dimLinePt, textOverride, ctx.Db.Dimstyle);
                    try { dim.SetDatabaseDefaults(); } catch { }
                    dim.ColorIndex = 3; 

                    if (!string.IsNullOrEmpty(textOverride))
                    {
                        dim.DimensionText = textOverride;
                    }

                    try { dim.Normal = Vector3d.ZAxis; } catch { }
                    TryApplyDimSizeOverrides(dim);
                    TryApplyDimLayoutOverrides(dim);
                    
                    customizer?.Invoke(dim, ctx);

                    ctx.Style?.Apply(dim, DrawingStyleManager.Role.Dimension);
                    dim.ColorIndex = 3; 

                    ctx.Btr.AppendEntity(dim);
                    ctx.Tr.AddNewlyCreatedDBObject(dim, true);
                    try { dim.RecomputeDimensionBlock(true); } catch { }
                }
                finally
                {
                    HostApplicationServices.WorkingDatabase = prevDb;
                }
            }
            catch { }
        }

        private static void TryApplyDimSizeOverrides(Dimension dim)
        {
            if (dim == null) return;
            TrySetDimProp(dim, "Dimtxt", 3.5);
            TrySetDimProp(dim, "Dimasz", 2.5);
            TrySetDimProp(dim, "Dimgap", 1.0);
            TrySetDimProp(dim, "Dimexe", 1.0);
            TrySetDimProp(dim, "Dimexo", 0.0);
            TrySetDimProp(dim, "Dimtofl", true);
            TrySetDimProp(dim, "Dimatfit", 3);
            TrySetDimProp(dim, "Dimtad", 1);
            TrySetDimProp(dim, "Dimclrd", 3);
            TrySetDimProp(dim, "Dimclre", 3);
            TrySetDimProp(dim, "Dimclrt", 3);
        }

        private static void TryApplyDimLayoutOverrides(Dimension dim)
        {
            if (dim == null) return;
            TrySetDimProp(dim, "Dimtih", false);
            TrySetDimProp(dim, "Dimtoh", false);
            TrySetDimProp(dim, "Dimse1", false);
            TrySetDimProp(dim, "Dimse2", false);
        }

        private static void TrySetDimProp(object obj, string propName, double value)
        {
            if (obj == null) return;
            try
            {
                var prop = obj.GetType().GetProperty(propName);
                if (prop != null && prop.CanWrite && prop.PropertyType == typeof(double))
                    prop.SetValue(obj, value, null);
            }
            catch { }
        }

        private static void TrySetDimProp(object obj, string propName, bool value)
        {
            if (obj == null) return;
            try
            {
                var prop = obj.GetType().GetProperty(propName);
                if (prop != null && prop.CanWrite && prop.PropertyType == typeof(bool))
                    prop.SetValue(obj, value, null);
            }
            catch { }
        }
        
        private static void TrySetDimProp(object obj, string propName, int value)
        {
            if (obj == null) return;
            try
            {
                var prop = obj.GetType().GetProperty(propName);
                if (prop != null && prop.CanWrite && prop.PropertyType == typeof(int))
                    prop.SetValue(obj, value, null);
            }
            catch { }
        }

         private static ParamBag ScaleParamBag(ParamBag original, double scaleFactor)
        {
            if (original == null || Math.Abs(scaleFactor - 1.0) < 0.000001) return original;
            var newBag = new ParamBag();
            foreach(var k in original.GetKeys())
            {
                var v = original.GetString(k);
                if (k.Contains("Diameter") || k.Contains("Length") || k.Contains("Radius") || k.Contains("Prime") || k.Contains("Height") || k.Contains("Thickness") || k.Contains("Size"))
                {
                    if (double.TryParse(v, out var d))
                    {
                        newBag.Set(k, (d * scaleFactor).ToString("0.###"));
                    }
                    else { newBag.Set(k, v); }
                }
                else { newBag.Set(k, v); }
            }
            return newBag;
        }

    }
}