using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace KMBIM
{
    public class LinkedFunction
    {
        
        public IEnumerable<ExternalFileReference> GetLinkedFileReference(Autodesk.Revit.DB.Document doc)
        {
            var collector = new FilteredElementCollector(doc);
            List<ExternalFileReference> linkedElements = collector
                .OfClass(typeof(RevitLinkType))
                .Select(x => x.GetExternalFileReference())
                .ToList();

            return linkedElements;
        }

        public IEnumerable<Autodesk.Revit.DB.Document> GetLinkedDocuments(Autodesk.Revit.DB.Document doc)
        {
            var linkedFiles = GetLinkedFileReference(doc);
            var linkedFileNames = linkedFiles
                .Select(x => ModelPathUtils
                .ConvertModelPathToUserVisiblePath(
                x.GetAbsolutePath())).ToList();

            return doc.Application.Documents
                .Cast<Autodesk.Revit.DB.Document>()
                .Where(document => linkedFileNames.Any(
                    filename => document.PathName.Equals(filename)));
        }

        public void SelectFaceInLinkedFile(UIApplication uiapp, out PlanarFace pFace, out Reference pickRefer)
        {
            Document doc = uiapp.ActiveUIDocument.Document;
            pFace = null;
            pickRefer = null;

            IEnumerable<Autodesk.Revit.DB.Document> doc2 = GetLinkedDocuments(doc);
            Selection sel = uiapp.ActiveUIDocument.Selection;
                        
            try
            {
                bool loop = true;
                while (loop)
                {
                    pickRefer = sel.PickObject(ObjectType.PointOnElement, "면 선택 :");

                    Element elem = doc.GetElement(pickRefer.ElementId);

                    XYZ pos = pickRefer.GlobalPoint;

                    string s = pickRefer.ConvertToStableRepresentation(doc);
                    string[] tab_str = s.Split(':');
                    string id = tab_str[tab_str.Length - 3];

                    int ID;
                    Int32.TryParse(id, out ID);

                    Type et = elem.GetType();

                    if (typeof(RevitLinkType) == et || typeof(RevitLinkInstance) == et || typeof(Instance) == et)
                    {
                        foreach (Autodesk.Revit.DB.Document d in doc2)
                        {
                            if (elem.Name.Contains(d.Title))
                            {
                                Element element = d.GetElement(new ElementId(ID));
                                Options opts = new Options();
                                opts.ComputeReferences = true;

                                //MessageBox.Show(element.Name, element.get_Geometry(opts).ToString());
                                GeometryElement geoElem = element.get_Geometry(opts);
                                if (geoElem == null)
                                {
                                    MessageBox.Show("선택한 객체가 면이 아닙니다.", "오류");
                                    break;
                                }
                                GeometryObject obj = geoElem.First();

                                foreach (GeometryObject obj2 in element.get_Geometry(opts))
                                {
                                    if (obj2 is Solid)
                                    {
                                        Solid solid2 = obj2 as Solid;
                                        foreach (Face face2 in solid2.Faces)
                                        {
                                            try
                                            {
                                                if (face2.Project(pos).XYZPoint.DistanceTo(pos) == 0)
                                                {
                                                    pFace = face2 as PlanarFace;
                                                    return;
                                                }

                                            }
                                            catch
                                            {

                                            }
                                        }
                                    }
                                }

                            }
                        }
                    }
                    else//링크 인스턴스가 아닌경우
                    {
                        //선택한 면 Face로 변경
                        GeometryObject geoObject = doc.GetElement(pickRefer).GetGeometryObjectFromReference(pickRefer);
                        if (geoObject == null)
                        {
                            MessageBox.Show("선택한 객체가 면이 아닙니다.", "오류");
                        }
                        else
                        {
                            //Face rface = geoObject as Face;
                            pFace = geoObject as PlanarFace;
                            if (pFace == null)
                                MessageBox.Show("선택한 객체가 면이 아닙니다.", "오류");
                            else
                                return;
                        }
                        
                    }
                }
                
            }
            catch
            {

            }
            
            return;
        }
    }


}