using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

using CommunityToolkit.Mvvm.ComponentModel;

using CommunityToolkit.Mvvm.Input;

using Nice3point.Revit.Toolkit.External.Handlers;

using System;
using System.Diagnostics;

using System.Linq;

namespace Szmedi.RvKits.MEPTools
{
    public partial class QuickViewSectionViewModel(UIDocument uidoc) : ObservableObject
    {
        private readonly ActionEventHandler handler = new();

        [ObservableProperty]
        private bool isParallel = true;

        private readonly List<ViewSection> viewSections = [];

        [RelayCommand]
        private void DeleteViewSection()
        {
            handler.Raise(
                uiapp =>
                {
                    var uidoc = uiapp.ActiveUIDocument;
                    var doc = uidoc.Document;
                    doc.Invoke(
                        ts =>
                        {
                            for (var i = viewSections.Count - 1; i >= 0; i--)
                            {
                                var view = viewSections[i];
                                if (view.IsValidObject)
                                {
                                    var uiView = uidoc.GetOpenUIViews().FirstOrDefault(ui => ui.ViewId == view.Id);

                                    uiView?.Close();
                                    viewSections.Remove(view);
                                    doc.Delete(view.Id);

                                }
                            }
                        }, "删除快速剖面");
                });
        }

        [RelayCommand]
        private void CreateViewSection()
        {
            try
            {
                var reference = uidoc.Selection
                    .PickObject(
                        Autodesk.Revit.UI.Selection.ObjectType.Element,
                        new FuncFilter(elem => elem.GetLocCurve() is Line l && l.Direction.Z < 0.001),
                        "请选择基于线的实例");
                var element = uidoc.Document.GetElement(reference);
                if (element != null)
                {
                    var lc = element.Location as LocationCurve;
                    var line = lc.Curve as Line;
                    var doc = uidoc.Document;
                    var viewfamilyType = doc.OfType<ViewFamilyType>()
                                .Cast<ViewFamilyType>()
                                .Where(t => t.ViewFamily == ViewFamily.Section)
                                .FirstOrDefault();
                    var bb = element.get_BoundingBox(null);
                    var minZ = bb.Min.Z;
                    var maxZ = bb.Max.Z;

                    var baseLength = (bb.Max - bb.Min).GetLength();

                    ViewSection viewSection = null;
                    BoundingBoxXYZ sectionBox;
                    var offset = 2.0;
                    var t = Transform.Identity;
                    Debug.WriteLine($"Length：{baseLength}");
                    Debug.WriteLine($"Offset：{offset}");
                    Debug.WriteLine("拾取对象：");

                    Debug.WriteLine($"Min：{bb.Min}");
                    Debug.WriteLine($"Max：{bb.Max}");

                    t.Origin = line.Evaluate(0.5, true).Flatten();
                    Debug.WriteLine("定义剖面：");
                    Debug.WriteLine($"Transform.Origin：{t.Origin}");
                    t.BasisY = XYZ.BasisZ;//UpDirection
                    var viewName = $"剖面-({element.Category.Name})-({element.Id})";
                    var min = new XYZ(-baseLength / 2, minZ - offset, -offset);
                    var max = new XYZ(baseLength / 2, maxZ + offset, offset);
                    Debug.WriteLine($"Min：{min}");
                    Debug.WriteLine($"Max：{max}");

                    var dir = line.Direction.Flatten();
                    if (IsParallel)
                    {
                        viewName = $"{viewName}-平行";
                        //与生成的最终剖面视图的RightDirection反向(定义Transform)
                        t.BasisX = dir;
                        //与生成的最终剖面视图的ViewDirection反向(定义Transform)
                        t.BasisZ = dir.CrossProduct(XYZ.BasisZ);
                        Debug.WriteLine($"Transform.BasisX：{t.BasisX}");
                        Debug.WriteLine($"Transform.BasisZ：{t.BasisZ}");

                        sectionBox = new BoundingBoxXYZ
                        {
                            Transform = t,
                            Min = min,
                            Max = max
                        };
                    }
                    else
                    {
                        //var transform = line.ComputeDerivatives(0.5, true);//求导切向为BasisX
                        viewName = $"{viewName}-正交";
                        t.BasisX = XYZ.BasisZ.CrossProduct(dir);
                        t.BasisZ = dir;
                        //var min = new XYZ(-baseLength / 2, minZ - offset, -offset);
                        //var max = new XYZ(baseLength / 2, maxZ + offset, offset);

                        Debug.WriteLine($"Transform.BasisX：{t.BasisX}");
                        Debug.WriteLine($"Transform.BasisZ：{t.BasisZ}");

                        sectionBox = new BoundingBoxXYZ
                        {
                            Transform = t,
                            Min = min,
                            Max = max
                        };
                    }
                    handler.Raise(
                          _ =>
                          {
                              doc.Invoke(
                               ts =>
                               {
                                   viewSection = ViewSection.CreateSection(uidoc.Document, viewfamilyType.Id, sectionBox);
                                   viewSection.DisplayStyle = DisplayStyle.ShadingWithEdges;
                                   viewSection.DetailLevel = ViewDetailLevel.Fine;
                                   var isExistName = false;
                                   try
                                   {
                                       viewSection.Name = viewName;
                                   }
                                   catch (Autodesk.Revit.Exceptions.ArgumentException)
                                   {
                                       isExistName = true;
                                   }
                                   if (isExistName)
                                   {
                                       for (var i = 0; i < 100; i++)
                                       {
                                           try
                                           {
                                               viewSection.Name = $"{viewName} {i + 1}";
                                               break;
                                           }
                                           catch (Autodesk.Revit.Exceptions.ArgumentException)
                                           {
                                           }
                                       }
                                   }
                                   ts.Commit();
                                   Debug.WriteLine("生成后：");

                                   Debug.WriteLine($"CropBox.Origin：{viewSection.CropBox.Transform.Origin}");
                                   Debug.WriteLine($"CropBox.BasisX：{viewSection.CropBox.Transform.BasisX}");
                                   Debug.WriteLine($"CropBox.BasisZ：{viewSection.CropBox.Transform.BasisZ}");

                                   Debug.WriteLine($"CropBox.Min：{viewSection.CropBox.Min}");
                                   Debug.WriteLine($"CropBox.Max：{viewSection.CropBox.Max}");

                                   Debug.WriteLine($"RightDirection：{viewSection.RightDirection}");
                                   Debug.WriteLine($"ViewDirection：{viewSection.ViewDirection}");

                                   if (viewSection != null)
                                   {
                                       uidoc.ActiveView = viewSection;
                                       uidoc.Selection.SetElementIds([element.Id]);
                                   }
                               });
                          });
                }
            }
            catch (Autodesk.Revit.Exceptions.OperationCanceledException)
            {

            }
            catch
            {

            }
        }

    }
}