using System;
using System.Collections.Generic;
using System.Linq;

using Bentley.DgnPlatformNET;
using Bentley.DgnPlatformNET.Elements;
using Bentley.GeometryNET;
using Bentley.MstnPlatformNET;

using Mstn.Toolkit.Extensions;

namespace Mstn.Toolkit.Extensions
{
    public static class ElementExtensions
    {
        /// <summary>
        /// 元素应用变换
        /// </summary>
        /// <param name="elem"></param>
        /// <param name="transform3D"></param>
        public static void MakeTransform(this Element elem, DTransform3d transform3D)
        {
            Element newElement = Element.GetFromElementRef(elem.GetNativeElementRef());
            TransformInfo info = new TransformInfo(transform3D);
            newElement.ApplyTransform(info);
            newElement.ReplaceInModel(elem);
        }
        /// <summary>
        /// 提取曲面边界点
        /// </summary>
        /// <param name="eleMesh"></param>
        /// <returns></returns>
        public static HashSet<DPoint3d> ExtractBoundaryPoints(Element eleMesh)
        {
            var listPtNew = new HashSet<DPoint3d>();

            var query = MeshQuery.GetAsMeshQuery(eleMesh);
            PolyfaceHeader faceHeader = query.GetMeshData();

            if (faceHeader.IsClosedByEdgePairing)
            {
                foreach (var item in faceHeader.Point)
                {
                    listPtNew.Add(item);
                }
            }
            else
            {
                var face = PolyfaceHeader.RemoveDuplicateFaces(faceHeader, true);
                var curVector = face.ExtractBoundaryStrings(out var openPaths, out int closedPaths);
                foreach (var item in face.Point)
                {
                    listPtNew.Add(item);
                }
            }

            return listPtNew;
        }
        /// <summary>
        /// 设置颜色
        /// </summary>
        /// <param name="element"></param>
        /// <param name="colorIndex"></param>
        /// <returns></returns>
        public static Element SetSolidColor(this Element element, uint colorIndex)
        {
            if (element.ElementType == MSElementType.Solid)//判断元素类型是否为Solid
            {
                ElementPropertiesSetter setter = new ElementPropertiesSetter();//修改元素属性
                setter.SetColor(colorIndex);//设置索引值colorIndex的颜色为元素颜色
                setter.Apply(element);//将设置应用于指定元素
                return element;
            }
            return null;
        }
        /// <summary>
        /// 获取元素的图层，如果是一般单元，则按第一个子元素来获取
        /// </summary>
        /// <param name="element"></param>
        /// <returns></returns>
        public static LevelHandle GetLevel(this Element element)
        {
            ElementPropertiesGetter getter = new ElementPropertiesGetter(element);

            var lvlcache = Session.Instance.GetActiveDgnFile().GetLevelCache();
            //一般单元
            if (element.GetChildren().Count() > 0)
            {
                foreach (var elem in element.GetChildren())
                {
                    if (elem is DisplayableElement && !elem.IsInvisible)
                    {
                        return elem.GetLevel();
                    }
                }
            }
            return lvlcache.GetLevel(getter.Level, true);
        }
        /// <summary>
        /// 设置元素图层
        /// </summary>
        /// <param name="element"></param>
        /// <param name="leveName"></param>
        /// <remarks>图层名不存在时，则创建</remarks>
        /// <returns></returns>
        public static Element SetLevel(this Element element, string leveName)
        {
            Element oldElem = Element.GetFromElementRef(element.GetNativeElementRef());
            if (string.IsNullOrEmpty(leveName))
            {
                return element;
            }
            //获取指定名层
            DgnFile dgnfile = Session.Instance.GetActiveDgnFile();
            FileLevelCache lvlCache = dgnfile.GetLevelCache();
            LevelHandle lvlHandle = lvlCache.GetLevelByName(leveName);
            if (!lvlHandle.IsValid)//当前文件中不存在时创建
            {
                lvlCache.CreateLevel(leveName);
                lvlCache.Write();
                lvlHandle = lvlCache.GetLevelByName(leveName);
            }
            //设置元素的层属性写入模型中
            ElementPropertiesSetter eleSet = new ElementPropertiesSetter();
            eleSet.SetLevel(lvlHandle.LevelId);
            eleSet.Apply(element);
            element.ReplaceInModel(oldElem);
            return element;
        }
        /// <summary>
        /// 获取元素的长度
        /// </summary>
        /// <param name="elem">元素</param>
        /// <returns>长度值，单位mm</returns>
        public static double GetLength(this Element elem)
        {
            double length = default;

            if (elem is LineElement line)
            {
                length = line.GetCurveVector().SumOfLengths();
            }
            if (elem is ComplexStringElement complexString)
            {
                length = complexString.GetCurveVector().SumOfLengths();
            }
            if (elem is LineStringBaseElement lineStringBase)
            {
                length = lineStringBase.GetCurveVector().SumOfLengths();
            }
            if (elem is EllipseElement ellipseElement)
            {
                length = ellipseElement.GetCurveVector().SumOfLengths();
            }
            //if (elem is LineStringElement lineString)
            //{
            //    curve = lineString.GetCurveVector().SumOfLengths();
            //    //GetFilteredECPropValue(lineString, "ID-100-名称");
            //}
            //if (elem is ShapeElement shape)
            //{
            //    curve = shape.GetCurveVector().SumOfLengths();
            //}
            if (elem is ComplexShapeElement complexShape)
            {
                length = complexShape.GetCurveVector().SumOfLengths();
            }
            if (elem is BSplineCurveElement bSplineCurve)
            {
                length = bSplineCurve.GetCurveVector().SumOfLengths();
            }
            return Math.Round(length, MidpointRounding.AwayFromZero);
        }
        /// <summary>
        /// 获取元素的CurveVector
        /// </summary>
        /// <returns></returns>
        public static CurveVector GetCurveVector(this Element elem)
        {
            CurveVector curve = default;

            if (elem is LineElement line)
            {
                curve = line.GetCurveVector();
            }
            if (elem is ComplexStringElement complexString)
            {
                curve = complexString.GetCurveVector();
            }
            if (elem is LineStringBaseElement lineStringBase)
            {
                curve = lineStringBase.GetCurveVector();
            }
            if (elem is EllipseElement ellipseElement)
            {
                curve = ellipseElement.GetCurveVector();
            }
            //if (elem is LineStringElement lineString)
            //{
            //    curve = lineString.GetCurveVector();
            //    //GetFilteredECPropValue(lineString, "ID-100-名称");
            //}
            //if (elem is ShapeElement shape)
            //{
            //    curve = shape.GetCurveVector();
            //}
            if (elem is ComplexShapeElement complexShape)
            {
                curve = complexShape.GetCurveVector();

            }
            if (elem is BSplineCurveElement bSplineCurve)
            {
                curve = bSplineCurve.GetCurveVector();
            }

            return curve;
        }
        /// <summary>
        /// 获取元素中的圆弧
        /// </summary>
        /// <param leveName="elem"></param>
        /// <returns>若没有，则返回空列表</returns>
        public static List<DEllipse3d> GetArcs(this Element elem)
        {
            var list = new List<DEllipse3d>();
            foreach (var child in elem.GetCurveVector())
            {
                if (child.GetCurvePrimitiveType() == CurvePrimitive.CurvePrimitiveType.Arc)
                {
                    child.TryGetArc(out var arc);
                    list.Add(arc);
                }
            }
            return list;
        }
        /// <summary>
        /// 获取元素中线
        /// </summary>
        /// <param leveName="elem"></param>
        /// <returns></returns>
        public static List<DSegment3d> GetLines(this Element elem)
        {
            var list = new List<DSegment3d>();
            foreach (var child in elem.GetCurveVector())
            {
                if (child.GetCurvePrimitiveType() == CurvePrimitive.CurvePrimitiveType.Arc)
                {
                    child.TryGetLine(out var line);
                    list.Add(line);
                }
            }
            return list;
        }
    }
}