using System.IO;
using System.Text;

using Autodesk.Revit.DB;

namespace Sai.Toolkit.Revit.Assist;

public static class ImportInstanceAssist
{
    /// <summary>
    /// 获取块参照
    /// </summary>
    /// <param name="dwg"></param>
    /// <param name="reference">选择的块参考</param>
    /// <returns></returns>
    public static List<GeometryInstance> GetBlocksByRef(this ImportInstance dwg, Reference reference)
    {
        var geoElem = dwg.get_Geometry(new Options());
        //dwg块
        var geoObj = dwg.GetGeometryObjectFromReference(reference);
        GeometryInstance referBlock = null;
        foreach (var obj in geoElem)
        {
            if (obj is GeometryInstance dwgGeo) //dwg几何实例
            {
                foreach (var block in dwgGeo.SymbolGeometry) //块
                {
                    if (block is GeometryInstance ins)
                    {
                        if (ins.GetHashCode() == geoObj.GetHashCode())
                        {
                            referBlock = ins;
                            break;
                        }

                        foreach (var subBlock in ins.SymbolGeometry) //嵌套块/子块
                        {
                            if (subBlock is GeometryInstance subIns && subIns.GetHashCode() == geoObj.GetHashCode())
                            {
                                referBlock = ins;
                                break;
                            }
                        }
                    }
                }
            }
        }

        if (referBlock == null)
        {
            return null;
        }

        List<GeometryInstance> blocks = [];
        foreach (var obj in geoElem)
        {
            if (obj is GeometryInstance dwgGeo)
            {
                foreach (var block in dwgGeo.SymbolGeometry) //图元
                {
#if REVIT2018 || REVIT2020
                    if (block is GeometryInstance ins && ins.Symbol.Name == referBlock.Symbol.Name)
                    {
                        blocks.Add(ins);
                    }
#elif REVIT2025
                    if (block is GeometryInstance ins && ins.GetSymbolGeometryId().SymbolId == referBlock.GetSymbolGeometryId().SymbolId)
                    {
                        blocks.Add(ins);
                    }
#endif

                }
            }
        }
        return blocks;
    }
    public static CurveByPoints ConvertToMassCurve(this ImportInstance importInstance)
    {
        var famdoc = importInstance.Document;
        var curves = importInstance.GetCurves();
        var array = new ReferencePointArray();
        foreach (var c in curves)
        {
            var referencePoint = famdoc.FamilyCreate.NewReferencePoint(c.GetEndPoint(0));
            array.Append(referencePoint);
        }
        array.Append(famdoc.FamilyCreate.NewReferencePoint(curves.Last().GetEndPoint(1)));

        return famdoc.FamilyCreate.NewCurveByPoints(array);
    }
    /// <summary>
    /// 获取dwg的曲线
    /// </summary>
    /// <param name="importInstance"></param>
    /// <returns></returns>
    public static List<Curve> GetCurves(this ImportInstance importInstance)
    {
        List<Curve> curves = [];
        var geoElem = importInstance.get_Geometry(new Options());
        foreach (var geomObj in geoElem)
        {
            var geomInstance = geomObj as GeometryInstance;

            if (geomInstance != null)
            {
                foreach (var instObj in geomInstance.GetInstanceGeometry())
                {
                    //polyLine拆成线
                    if (instObj is PolyLine line)
                    {
                        var poly = line.GetCoordinates();
                        for (var i = 0; i < poly.Count - 1; i++)
                        {
                            var l = Line.CreateBound(poly[i], poly[i + 1]);
                            curves.Add(l);
                        }
                    }

                    if (instObj is Arc arc)
                    {
                        curves.Add(arc);
                    }
                }
            }
        }

        return curves;
    }

    /// <summary>
    /// 获取包含的图块，图层
    /// </summary>
    /// <param name="dwg"></param>
    public static StringBuilder GetDwgInfo(this ImportInstance dwg)
    {
        StringBuilder sb = new();
        var geoElem = dwg.get_Geometry(new Options());
        foreach (var obj in geoElem)
        {
            if (obj is GeometryInstance instance) //dwg
            {
                foreach (var obj1 in instance.SymbolGeometry) //图元
                {
                    if (obj1 is GeometryInstance block)
                    {
                        var graphicsStyle = dwg.Document.GetElement(obj1.GraphicsStyleId) as GraphicsStyle;
                        var layerName = graphicsStyle?.GraphicsStyleCategory.Name;
#if REVIT2018 || REVIT2020
                        sb.AppendLine($"{block.Symbol.Name}({obj1.GraphicsStyleId})-{layerName}-{block.Symbol.UniqueId}");
#elif REVIT2025
                        var id = block.GetSymbolGeometryId().SymbolId;
                        var elem = dwg.Document.GetElement(id);
                        sb.AppendLine($"{elem.Name}({obj1.GraphicsStyleId})-{layerName}-{elem.UniqueId}");
#endif
                    }
                }
            }
        }
        return sb;
    }

    /// <summary>
    /// 获取dwg所在的路径
    /// </summary>
    /// <param name="dwg"></param>
    /// <returns></returns>
    public static string GetDwgPath(this ImportInstance dwg)
    {
        var cadLinkType = dwg.Document.GetElement(dwg.GetTypeId()) as CADLinkType;
        var filePath = cadLinkType?.GetExternalFileReference().GetLinkedFileStatus() == LinkedFileStatus.Loaded
            ? ModelPathUtils.ConvertModelPathToUserVisiblePath(cadLinkType?.GetExternalFileReference().GetAbsolutePath())
            : throw new InvalidOperationException("该dwg不是链接");
        return !File.Exists(filePath) ? throw new InvalidOperationException("链接文件路径不存在") : filePath;
    }
    /// <summary>
    /// 获取参考所在的图层名称
    /// </summary>
    /// <param name="dwg"></param>
    /// <param name="reference"></param>
    /// <returns></returns>
    public static string GetLayerName(this ImportInstance dwg, Reference reference)
    {
        var obj = dwg.GetGeometryObjectFromReference(reference);
        var style = dwg.Document.GetElement(obj.GraphicsStyleId) as GraphicsStyle;
        return style?.GraphicsStyleCategory.Name;
    }

    /// <summary>
    /// 获取变换
    /// </summary>
    /// <param name="importInstance"></param>
    /// <param name="reference"></param>
    /// <returns></returns>
    public static Transform GetTransform(this ImportInstance importInstance, Reference reference)
    {
        var geoObj = importInstance.GetGeometryObjectFromReference(reference);
        var geomInstance = geoObj as GeometryInstance;
        return geomInstance?.Transform;
    }
}