//
// (C) Copyright 2003-2017 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
// that both that copyright notice and the limited warranty and
// restricted rights notice below appear in all supporting
// documentation.
//
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// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
// Use, duplication, or disclosure by the U.S. Government is subject to
// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
// (Rights in Technical Data and Computer Software), as applicable.
//


using System;
using System.Collections.Generic;
using System.Text;
using Autodesk.Revit.DB;
using Autodesk.Revit;
using Element = Autodesk.Revit.DB.Element;
using KMBIM.Revit.Tools.Utils;
using KDCS.Utils;

namespace KMBIM
{
    /// <summary>
    /// This class is used to detect the obstructions of a Line or a ray.
    /// </summary>
    class Detector
    {
        /// <summary>
        /// Revit Document.
        /// </summary>
        private Document m_rvtDoc;

        /// <summary>
        /// Revit 3D view.
        /// </summary>
        private View3D m_view3d;

        /// <summary>
        /// Constructor, initialize all the fields.
        /// </summary>
        /// <param name="rvtDoc">Revit Document</param>
        public Detector(Document rvtDoc)
        {
            m_rvtDoc = rvtDoc;
            FilteredElementCollector collector = new FilteredElementCollector(m_rvtDoc);
            FilteredElementIterator iter = collector.OfClass(typeof(View3D)).GetElementIterator();
            iter.Reset();
            while (iter.MoveNext())
            {
                m_view3d = iter.Current as View3D;
                if (null != m_view3d && !m_view3d.IsTemplate)
                    break;
            }
        }

        public View3D GetView3d()
        {
            return m_view3d;
        }

       


        /// <summary>
        /// Return all the obstructions which intersect with a bound line.
        /// </summary>
        /// <param name="boundLine">Bound line</param>
        /// <returns>Obstructions intersected with the bound line</returns>
        public List<ReferenceWithContext> Obstructions(Line lineSeg, KDCSIntersectorElement kdcs_itse)
        {
            ElementId eId = kdcs_itse.Id;
            List<ReferenceWithContext> result = new List<ReferenceWithContext>();

            ReferenceIntersector referenceIntersector = null;            
            // ¿¬°áµÈ Revit ¸ðµ¨ÀÎ °æ¿ì ºö(°Å´õ) °£¼· È®ÀÎ
            if (kdcs_itse.GetLinkDocument() != null)
            {
                List<BuiltInCategory> builtInCats = new List<BuiltInCategory>();
                builtInCats.Add(BuiltInCategory.OST_StructuralFraming);
                ElementMulticategoryFilter intersectFilter = new ElementMulticategoryFilter(builtInCats);
                referenceIntersector = new ReferenceIntersector(intersectFilter, FindReferenceTarget.Face, m_view3d);
                referenceIntersector.FindReferencesInRevitLinks = true;
               
                // ÁÖ¾îÁø ¿ä¼Ò(eId)ÀÌ Á¡°ú ¹æÇâÀ¸·Î ¸¸µé¾îÁø ±¤¼±°ú ±³Â÷ÇÏ´Â Áö È®ÀÎ
                Line vline = Line.CreateBound(lineSeg.GetEndPoint(0) - lineSeg.Direction * 0.32, lineSeg.GetEndPoint(0) + lineSeg.Direction * 0.32);
            }
            else
            {
                referenceIntersector = new ReferenceIntersector(eId, FindReferenceTarget.Face, m_view3d);               
            }




            List<XYZ> pts = new List<XYZ>();
            // ÁÖ¾îÁø ¿ä¼Ò(eId)ÀÌ Á¡°ú ¹æÇâÀ¸·Î ¸¸µé¾îÁø ±¤¼±°ú ±³Â÷ÇÏ´Â Áö È®ÀÎ
            IList<ReferenceWithContext> obstructionsOnUnboundLine = referenceIntersector.Find(lineSeg.GetEndPoint(0), lineSeg.Direction);
            foreach (ReferenceWithContext gRefWithContext in obstructionsOnUnboundLine)
            {
                Reference gRef = gRefWithContext.GetReference();
                XYZ itr = null;
                if (kdcs_itse.GetRevitLinkInstance() != null)
                {
                    if (gRef.LinkedElementId != eId) continue;
                    RevitLinkInstance rli = m_rvtDoc.GetElement(gRef.ElementId) as RevitLinkInstance;
                    if (rli != null)
                    {
                        itr = rli.GetTransform().OfPoint(gRef.GlobalPoint);
                    }
                    else itr = gRef.GlobalPoint;

                }
                else
                {
                    itr = gRef.GlobalPoint;
                }
                    
                    
                if (lineSeg.Distance(itr) < 1e-9)
                {
                    if (!InArray(result, gRefWithContext))
                    {
                        pts.Add(itr);
                        result.Add(gRefWithContext);
                    }
                }
            }
            if (pts.Count >= 2)
            {
                   
                //Util.CreateModelLine(m_rvtDoc, pts[0], pts[1]);
            }

           

           

            result.Sort(CompareReferencesWithContext);
            return result;
        }


    

        /// <summary>
        /// Judge whether a given Reference is in a Reference list.
        /// Give two References, if their Proximity and Element Id is equal, 
        /// we say the two reference is equal.
        /// </summary>
        /// <param name="arr">Reference Array</param>
        /// <param name="entry">Reference</param>
        /// <returns>True of false</returns>
        private bool InArray(List<ReferenceWithContext> arr, ReferenceWithContext entry)
        {
            foreach (ReferenceWithContext tmp in arr)
            {
                if (Math.Abs(tmp.Proximity - entry.Proximity) < 1e-9 &&
                    tmp.GetReference().ElementId == entry.GetReference().ElementId)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Used to compare two references, just compare their ProximityParameter.
        /// </summary>
        /// <param name="a">First Reference to compare</param>
        /// <param name="b">Second Reference to compare</param>
        /// <returns>-1, 0, or 1</returns>
        public int CompareReferencesWithContext(ReferenceWithContext a, ReferenceWithContext b)
        {
            if (a.Proximity > b.Proximity)
            {
                return 1;
            }

            if (a.Proximity < b.Proximity)
            {
                return -1;
            }

            return 0;
        }
    }
}