using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using KMBIM.Revit.Tools;
using Autodesk.Revit.UI.Selection;
using System.Windows.Forms;
using Autodesk.Revit.DB.Mechanical;
using System.Diagnostics;
using System.Drawing;
using KMBIM.Revit.Tools.Utils;
using Autodesk.Revit.DB.Plumbing;
using KMBIM.Utils;

namespace KMBIM
{
    /// <summary>
    /// Implements interface IExternalCommand of Revit API.
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class PipeConnectionCmd : IExternalCommand
    {
        UIApplication m_pUIApp;
        System.Drawing.Point m_pt1, m_pt2 = System.Drawing.Point.Empty;

        void DrawTask(System.Threading.CancellationToken ct)
        {
            while (!ct.IsCancellationRequested)
            {
                m_pt2 = Cursor.Position;
                if (m_pt2.X < m_pUIApp.DrawingAreaExtents.Left + 2 ||
                    m_pt2.X > m_pUIApp.DrawingAreaExtents.Right - 20 ||
                    m_pt2.Y > m_pUIApp.DrawingAreaExtents.Bottom - 20 ||
                    m_pt2.Y < m_pUIApp.DrawingAreaExtents.Top + 2)
                {
                    System.Threading.Thread.Sleep(20);
                    continue;
                }
                if (m_pt1 != System.Drawing.Point.Empty)
                    using (Graphics g = Graphics.FromHwnd(IntPtr.Zero))
                    {
                        g.DrawLine(Pens.Black, m_pt1, m_pt2);
                    }
                System.Threading.Thread.Sleep(20);
            }
        }


        public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData, ref string message, Autodesk.Revit.DB.ElementSet elements)
        {            
            try
            {
                if (!WorkMain.GetInstance().IsValid) return Autodesk.Revit.UI.Result.Succeeded;
                m_pUIApp = commandData.Application;
                UIDocument uidoc = m_pUIApp.ActiveUIDocument;
                Document doc = uidoc.Document;

                Selection sel1 = uidoc.Selection;
                List<XYZ> tempXYZ = new List<XYZ>(1);


                Element baseElement = null;
                Reference refPipe1 = null;
                try
                {
                    refPipe1 = uidoc.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element, "기준 커넥터 선택 :");
                    if (refPipe1 == null) return Result.Cancelled;
                    baseElement = uidoc.Document.GetElement(refPipe1);
                }
                catch (Exception) { }

                if (baseElement == null) return Result.Failed;

                Element targetElement = null;
                Reference refPipe2 = null;
                try
                {
                    refPipe2 = m_pUIApp.ActiveUIDocument.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element, "대상 커넥터 선택 :");
                    if (refPipe2 == null) return Result.Cancelled;
                    targetElement = m_pUIApp.ActiveUIDocument.Document.GetElement(refPipe2);
                }
                catch (Exception) { }

                if (targetElement == null) return Result.Failed;

                XYZ pick1 = refPipe1.GlobalPoint;
                XYZ pick2 = refPipe2.GlobalPoint;

                App.thisApp.OpenFormPipeConnector(m_pUIApp);  
                var wfPipeConnector = App.thisApp.m_wfPipeConnector;
                wfPipeConnector.uidoc = m_pUIApp.ActiveUIDocument;  
                App.thisApp.ShowFormPipeConnector(m_pUIApp, baseElement, pick1, targetElement, pick2);            
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            return Result.Succeeded;
        }

       


       
       

        //선택한 개체를 필터링할 수 있는 인터페이스 구현(= An interface that provides the ability to filter objects during a selection operation)
        public class PlanarFacesSelectionFilter : ISelectionFilter
        {
            Document doc = null;
            public PlanarFacesSelectionFilter(Document document)
            {
                doc = document;
            }

            public bool AllowElement(Element elem)
            {
                return true;
            }

            public bool AllowReference(Reference reference, XYZ position)
            {
                if (doc.GetElement(reference).GetGeometryObjectFromReference(reference) is PlanarFace)
                { return true; }
                return false;
            }
        }

        public List<Element> GetDuctLine(UIDocument uidoc, Document document)
        {
            ISelectionFilter selectionFilter = new PlanarFacesSelectionFilter(document);
            List<Element> elementList = new List<Element>();
            if (MessageBox.Show("Duct 생성하시려면 line 을 선택 후 \n좌측 하단의 Finsh 버튼을 클릭해주세요", "Duct 생성확인", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                IList<Reference> references = uidoc.Selection.PickObjects(ObjectType.Element, selectionFilter, "Select Multiple planar faces");
                foreach (Reference reference in references)
                {
                    Element element = uidoc.Document.GetElement(reference);
                    elementList.Add(element);
                }
            }

            return elementList;
        }

        

        

       


    }
}