using System.Diagnostics;

using Autodesk.Revit.DB;

namespace ShrlAlgoToolkit.RevitCore.Assists
{
    public class GeometryAssist
    {
        /// <summary>
        /// 获取多个元素的合并包围盒
        /// </summary>
        /// <param name="elements">元素集合</param>
        /// <returns>合并后的 BoundingBoxXYZ，如果集合为空或无有效包围盒则返回 null</returns>
        public static BoundingBoxXYZ GetCombinedBoundingBox(IEnumerable<Element> elements)
        {
            if (elements == null) return null;

            double minX = double.MaxValue;
            double minY = double.MaxValue;
            double minZ = double.MaxValue;

            double maxX = double.MinValue;
            double maxY = double.MinValue;
            double maxZ = double.MinValue;

            bool hasValidBox = false;

            foreach (var elem in elements)
            {
                // 传入 null 表示获取模型坐标系下的包围盒
                BoundingBoxXYZ box = elem.get_BoundingBox(null);

                // 注意：有些元素（如某些基准面或未放置的族实例）可能返回 null
                if (box == null) continue;

                // 比较并更新最小值
                if (box.Min.X < minX) minX = box.Min.X;
                if (box.Min.Y < minY) minY = box.Min.Y;
                if (box.Min.Z < minZ) minZ = box.Min.Z;

                // 比较并更新最大值
                if (box.Max.X > maxX) maxX = box.Max.X;
                if (box.Max.Y > maxY) maxY = box.Max.Y;
                if (box.Max.Z > maxZ) maxZ = box.Max.Z;

                hasValidBox = true;
            }

            if (!hasValidBox) return null;

            // 构造新的包围盒
            BoundingBoxXYZ combinedBox = new BoundingBoxXYZ();
            combinedBox.Min = new XYZ(minX, minY, minZ);
            combinedBox.Max = new XYZ(maxX, maxY, maxZ);

            return combinedBox;
        }
        /// <summary>
        /// 对曲线列表进行排序，使其正确排序和定向，形成线串。
        /// </summary>
        public static void SortCurvesContiguous(IList<Curve> curves, bool debug_output = false)
        {
            const double inch = 1.0 / 12.0;
            const double sixteenth = inch / 16.0;
            int n = curves.Count;
            for (int i = 0; i < n; ++i)
            {
                Curve curve = curves[i];
                XYZ endPoint = curve.GetEndPoint(1);

                XYZ p;

                // 查找起点 = 终点的曲线

                bool found = (i + 1 >= n);

                for (int j = i + 1; j < n; ++j)
                {
                    p = curves[j].GetEndPoint(0);

                    // 如果匹配 end->start、
                    // 这是下一条曲线

                    if (sixteenth > p.DistanceTo(endPoint))
                    {
                        if (debug_output)
                        {
                            Debug.Print("{0} 起始点, 换成 {1}", j, i + 1);
                        }

                        if (i + 1 != j)
                        {
                            Curve tmp = curves[i + 1];
                            curves[i + 1] = curves[j];
                            curves[j] = tmp;
                        }
                        found = true;
                        break;
                    }

                    p = curves[j].GetEndPoint(1);

                    // 如果有匹配结果 end->end、
                    // 反转下一条曲线

                    if (sixteenth > p.DistanceTo(endPoint))
                    {
                        if (i + 1 == j)
                        {
                            if (debug_output)
                            {
                                Debug.Print("{0} 终点, 反向 {1}", j, i + 1);
                            }

                            curves[i + 1] = curves[j].CreateReversed();
                        }
                        else
                        {
                            if (debug_output)
                            {
                                Debug.Print("{0} 终点, 倒换 {1}", j, i + 1);
                            }

                            Curve tmp = curves[i + 1];
                            curves[i + 1] = curves[j].CreateReversed();
                            curves[j] = tmp;
                        }
                        found = true;
                        break;
                    }
                }
                if (!found)
                {
                    throw new Exception("SortCurvesContiguous:" + " 非连续输入曲线");
                }
            }
        }
        public static void CreateDirectShape(
            Document doc,
            List<XYZ> vertices,
            List<Face> faces,
            ElementId graphicsStyleId,
            ElementId categoryId,
            string appGuid,
            string shapeName
        )
        {
            var nFaces = 0;
            var builder = new TessellatedShapeBuilder { LogString = shapeName };
            var corners = new List<XYZ>();
            builder.OpenConnectedFaceSet(false);
            foreach (var f in faces)
            {
                builder.LogInteger = nFaces;
                //if (corners.Capacity < f.Indices.Count)//设置corner的Capacity值，减少内存开销
                //{
                //    corners = new ErrorModels<XYZ>(f.Indices.Count);
                //}
                //corners.Clear();
                //foreach (Index i in f.Indices)
                //{
                //    if (i.vertex >= vertices.Count)
                //    {
                //        return;
                //    }
                //    corners.Add(vertices[i.vertex]);
                //}
                try
                {
                    builder.AddFace(new TessellatedFace(corners, ElementId.InvalidElementId));
                }
                catch (Autodesk.Revit.Exceptions.ArgumentException) { }
            }

            builder.CloseConnectedFaceSet();
            builder.Target = TessellatedShapeBuilderTarget.AnyGeometry;
            builder.Fallback = TessellatedShapeBuilderFallback.Mesh;
            builder.GraphicsStyleId = graphicsStyleId;
            builder.Build();
            var ds = DirectShape.CreateElement(doc, categoryId);
            ds.ApplicationId = appGuid;
            ds.ApplicationDataId = shapeName;
            ds.SetShape(builder.GetBuildResult().GetGeometricalObjects());
            ds.Name = shapeName;
        }

        //public BRepBuilder CreateGeo()
        //{
        //BRepBuilder bRepBuilder=new BRepBuilder(BRepType.Solid);
        //BRepBuilderEdgeGeometry.Create();
        //BRepBuilderSurfaceGeometry.Create();
        //BRepBuilderSurfaceGeometry.CreateNURBSSurface();
        //}
        public static void CreateDirectShapeFromCylinder(Document doc)
        {
            // Naming convention for faces and edges: we assume that x is to the left and pointing down, y is horizontal and pointing to the right, z is up
            var brepBuilder = new BRepBuilder(BRepType.Solid);

            // The surfaces of the four faces.
            var basis = new Frame(new XYZ(50, -100, 0), new XYZ(0, 1, 0), new XYZ(-1, 0, 0), new XYZ(0, 0, 1));
            var cylSurf = CylindricalSurface.Create(basis, 50);
            var top = Plane.CreateByNormalAndOrigin(new XYZ(0, 0, 1), new XYZ(0, 0, 100)); // normal points outside the cylinder
            var bottom = Plane.CreateByNormalAndOrigin(new XYZ(0, 0, 1), new XYZ(0, 0, 0)); // normal points inside the cylinder

            // Add the four faces
            var frontCylFaceId = brepBuilder.AddFace(BRepBuilderSurfaceGeometry.Create(cylSurf, null), false);
            var backCylFaceId = brepBuilder.AddFace(BRepBuilderSurfaceGeometry.Create(cylSurf, null), false);
            var topFaceId = brepBuilder.AddFace(BRepBuilderSurfaceGeometry.Create(top, null), false);
            var bottomFaceId = brepBuilder.AddFace(BRepBuilderSurfaceGeometry.Create(bottom, null), true);

            // Geometry for the four semi-circular edges and two vertical linear edges
            var frontEdgeBottom = BRepBuilderEdgeGeometry.Create(Arc.Create(new XYZ(0, -100, 0), new XYZ(100, -100, 0), new XYZ(50, -50, 0)));
            var backEdgeBottom = BRepBuilderEdgeGeometry.Create(Arc.Create(new XYZ(100, -100, 0), new XYZ(0, -100, 0), new XYZ(50, -150, 0)));

            var frontEdgeTop = BRepBuilderEdgeGeometry.Create(Arc.Create(new XYZ(0, -100, 100), new XYZ(100, -100, 100), new XYZ(50, -50, 100)));
            var backEdgeTop = BRepBuilderEdgeGeometry.Create(Arc.Create(new XYZ(0, -100, 100), new XYZ(100, -100, 100), new XYZ(50, -150, 100)));

            var linearEdgeFront = BRepBuilderEdgeGeometry.Create(new XYZ(100, -100, 0), new XYZ(100, -100, 100));
            var linearEdgeBack = BRepBuilderEdgeGeometry.Create(new XYZ(0, -100, 0), new XYZ(0, -100, 100));

            // Add the six edges
            var frontEdgeBottomId = brepBuilder.AddEdge(frontEdgeBottom);
            var frontEdgeTopId = brepBuilder.AddEdge(frontEdgeTop);
            var linearEdgeFrontId = brepBuilder.AddEdge(linearEdgeFront);
            var linearEdgeBackId = brepBuilder.AddEdge(linearEdgeBack);
            var backEdgeBottomId = brepBuilder.AddEdge(backEdgeBottom);
            var backEdgeTopId = brepBuilder.AddEdge(backEdgeTop);

            // Loops of the four faces
            var loopIdTop = brepBuilder.AddLoop(topFaceId);
            var loopIdBottom = brepBuilder.AddLoop(bottomFaceId);
            var loopIdFront = brepBuilder.AddLoop(frontCylFaceId);
            var loopIdBack = brepBuilder.AddLoop(backCylFaceId);

            // Add coedges for the loop of the front face
            brepBuilder.AddCoEdge(loopIdFront, linearEdgeBackId, false);
            brepBuilder.AddCoEdge(loopIdFront, frontEdgeTopId, false);
            brepBuilder.AddCoEdge(loopIdFront, linearEdgeFrontId, true);
            brepBuilder.AddCoEdge(loopIdFront, frontEdgeBottomId, true);
            brepBuilder.FinishLoop(loopIdFront);
            brepBuilder.FinishFace(frontCylFaceId);

            // Add coedges for the loop of the back face
            brepBuilder.AddCoEdge(loopIdBack, linearEdgeBackId, true);
            brepBuilder.AddCoEdge(loopIdBack, backEdgeBottomId, true);
            brepBuilder.AddCoEdge(loopIdBack, linearEdgeFrontId, false);
            brepBuilder.AddCoEdge(loopIdBack, backEdgeTopId, true);
            brepBuilder.FinishLoop(loopIdBack);
            brepBuilder.FinishFace(backCylFaceId);

            // Add coedges for the loop of the top face
            brepBuilder.AddCoEdge(loopIdTop, backEdgeTopId, false);
            brepBuilder.AddCoEdge(loopIdTop, frontEdgeTopId, true);
            brepBuilder.FinishLoop(loopIdTop);
            brepBuilder.FinishFace(topFaceId);

            // Add coedges for the loop of the bottom face
            brepBuilder.AddCoEdge(loopIdBottom, frontEdgeBottomId, false);
            brepBuilder.AddCoEdge(loopIdBottom, backEdgeBottomId, false);
            brepBuilder.FinishLoop(loopIdBottom);
            brepBuilder.FinishFace(bottomFaceId);

            brepBuilder.Finish();

            using var tr = new Transaction(doc, "Create a DirectShape");
            tr.Start();
            var ds = DirectShape.CreateElement(doc, new ElementId(BuiltInCategory.OST_GenericModel));
            ds.SetShape(brepBuilder);
            tr.Commit();
        }
    }
}