using System.Collections.ObjectModel;
using System.Windows;

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

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

using Nice3point.Revit.Toolkit.External.Handlers;



namespace ShrlAlgoToolkit.RevitAddins.RvView;

public partial class SectionBoxControllerViewModel : ObservableObject
{
    public SectionBoxControllerViewModel(UIApplication uiapp)
    {
        uiapp.ViewActivated -= Application_ViewActivated;
        uiapp.ViewActivated += Application_ViewActivated;

        if (uiapp.ActiveUIDocument.ActiveView is View3D view3d)
        {
            using var trans = new Transaction(uiapp.ActiveUIDocument.Document, "激活剖面框");
            trans.Start();
            if (!view3d.IsSectionBoxActive)
            {
                view3d.IsSectionBoxActive = true;
            }
            //defaultSectionBox = view3D.GetSectionBox();
            trans.Commit();
            CanModify = true;
        }
        else
        {
            CanModify = false;
        }
        setSectionBoxHandler = new ActionEventHandler();
        this.uiapp = uiapp;
    }

    private void Application_ViewActivated(object sender, Autodesk.Revit.UI.Events.ViewActivatedEventArgs e)
    {
        CanModify = e.CurrentActiveView is View3D view3d && view3d.IsSectionBoxActive;
    }

    [ObservableProperty]
    [NotifyCanExecuteChangedFor(nameof(RevitAddins.RvView.SectionBoxControllerViewModel.RecordSectionBoxCommand), nameof(RevitAddins.RvView.SectionBoxControllerViewModel.UpdateSectionBoxCommand))]
    private bool canModify;
    [ObservableProperty]
    private SectionBoxType sectionBoxType;
    [ObservableProperty]
    private bool needExtend;
    /// <summary>
    /// 记录剖面框修改
    /// </summary>
    public ObservableCollection<SectionBox> BoundingBoxes { get; set; } = [];

    private readonly ActionEventHandler setSectionBoxHandler;
    private readonly UIApplication uiapp;
    private int index = 1;

    [RelayCommand(CanExecute = nameof(RevitAddins.RvView.SectionBoxControllerViewModel.CanModify))]
    private void RecordSectionBox()
    {
        if (uiapp.ActiveUIDocument.Document.ActiveView is View3D { IsSectionBoxActive: true } view3D)
        {
            BoundingBoxes.Insert(0, new SectionBox($"剖面框 {index}", view3D.GetSectionBox()));
            index++;
        }
    }
    [RelayCommand]
    private void RemoveSectionBox(SectionBox sectionBox)
    {
        BoundingBoxes.Remove(sectionBox);
    }
    [RelayCommand]
    private void ResetSectionBox()
    {
        setSectionBoxHandler.Raise(uiapp =>
        {
            var uidoc = uiapp.ActiveUIDocument;
            switch (SectionBoxType)
            {
                case SectionBoxType.Element:
                    ResetSectionBoxByElement(uidoc);
                    break;
                case SectionBoxType.Rectangle:
                    ResetSectionBoxByRectangle(uidoc);
                    break;
                case SectionBoxType.ViewSection:
                    ResetSectionBoxByViewSection(uidoc);
                    break;
                default:
                    break;
            }

        });
    }
    /// <summary>
    /// 重设元素剖面框
    /// </summary>
    private void ResetSectionBoxByElement(UIDocument uidoc)
    {
        var doc = uidoc.Document;
        doc.Invoke(
            ts =>
            {
                if (doc.ActiveView is not View3D view3D)
                {
                    var viewFamilyType = doc.OfClass<ViewFamilyType>()
                        .Cast<ViewFamilyType>()
                        .FirstOrDefault(vft => vft.ViewFamily == ViewFamily.ThreeDimensional);
                    view3D = View3D.CreateIsometric(doc, viewFamilyType.Id);
                    view3D.DisplayStyle = DisplayStyle.ShadingWithEdges;
                    view3D.DetailLevel = ViewDetailLevel.Fine;
                }
                var elements = uidoc.GetSelectedElements();
                if (elements.Count == 0)
                {
                    return;
                }
                XYZ gmax = XYZ.Zero;
                XYZ gmin = XYZ.Zero;

                doc.InvokeSub(
                    sub =>
                    {
                        //var boundingBox = elements[0].get_BoundingBox(view3D);
                        //var maxX = boundingBox.Max.X;
                        //var maxY = boundingBox.Max.Y;
                        //var maxZ = boundingBox.Max.Z;
                        //var minX = boundingBox.Min.X;
                        //var minY = boundingBox.Min.Y;
                        //var minZ = boundingBox.Min.Z;
                        //foreach (var elem in elements)
                        //{
                        //    var box = elem.get_BoundingBox(view3D);
                        //    maxX = Math.Max(box.Max.X, maxX);
                        //    maxY = Math.Max(box.Max.Y, maxY);
                        //    maxZ = Math.Max(box.Max.Z, maxZ);
                        //    minX = Math.Min(box.Min.X, minX);
                        //    minY = Math.Min(box.Min.Y, minY);
                        //    minZ = Math.Min(box.Min.Z, minZ);
                        //}
                        var elementIds = elements.Select(e => e.Id).ToList();
                        var g = doc.Create.NewGroup(elementIds);
                        var boundingBox = g.get_BoundingBox(null);
                        gmax = g.get_BoundingBox(null).Max;
                        gmin = g.get_BoundingBox(null).Min;
                        sub.RollBack();
                        if (!boundingBox.Enabled)
                        {
                            MessageBox.Show("当前三维剖面框不可用", "错误");
                        }
                    });

                //var newbox = new BoundingBoxXYZ
                //{
                //    Max = new XYZ(maxX, maxY, maxZ),
                //    Min = new XYZ(minX, minY, minZ)
                //};
                var newbox = new BoundingBoxXYZ
                {
                    Max = gmax,
                    Min = gmin
                };
                //XYZ origin = new XYZ(0, 0, 0);
                //XYZ axis = new XYZ(0, 0, 1);
                //Transform rotate = Transform.CreateRotationAtPoint(axis, 2, origin);
                //box.Transform = box.Transform.Multiply(rotate);
                newbox = NeedExtend ? newbox.Extend() : newbox;
                view3D?.SetSectionBox(newbox);
                ts.Commit();
                uidoc.ActiveView = view3D;
            },
            "重设(元素)剖面框");

    }
    /// <summary>
    /// 重设框选剖面框
    /// </summary>
    private void ResetSectionBoxByRectangle(UIDocument uidoc)
    {
        var doc = uidoc.Document;
        doc.Invoke(
            ts =>
            {
                if (uidoc.ActiveView is not ViewPlan viewPlane)
                {
                    MessageBox.Show("请在平面上框选范围", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                    return;
                }
                var box = uidoc.Selection.PickBox(Autodesk.Revit.UI.Selection.PickBoxStyle.Directional);
                var max = box.Max;
                var min = box.Min;

                var currentLevel = viewPlane.GenLevel;
                var level = doc.OfClass<Level>()
                    .Cast<Level>()
                    .OrderBy(l => l.Elevation)
                    .FirstOrDefault(l => l.Elevation > currentLevel.Elevation);

                var boundMax = new XYZ(Math.Max(max.X, min.X), Math.Max(max.Y, min.Y), level.Elevation);
                var boundMin = new XYZ(Math.Min(max.X, min.X), Math.Min(max.Y, min.Y), min.Z);
                var bounding = new BoundingBoxXYZ() { Max = boundMax, Min = boundMin };
                var viewFamilyType = doc.OfClass<ViewFamilyType>()
                    .Cast<ViewFamilyType>()
                    .FirstOrDefault(vft => vft.ViewFamily == ViewFamily.ThreeDimensional);
                var view3D = View3D.CreateIsometric(doc, viewFamilyType.Id);
                view3D.IsSectionBoxActive = true;
                bounding = NeedExtend ? bounding : bounding.Extend();

                view3D.SetSectionBox(bounding);
                view3D.DisplayStyle = DisplayStyle.ShadingWithEdges;
                view3D.DetailLevel = ViewDetailLevel.Fine;
                ts.Commit();
                uidoc.ActiveView = view3D;

            },
            "重设(框选)剖面框");
    }
    /// <summary>
    /// 重设剖面视图范围的剖面框
    /// </summary>
    private void ResetSectionBoxByViewSection(UIDocument uidoc)
    {
        var reference = uidoc.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element, new FuncFilter(elem => elem.Category?.GetHashCode() == -2000278), "请选择剖面视图");
        var doc = uidoc.Document;
        var element = doc.GetElement(reference);
        if (element != null)
        {
            doc.Invoke(
                ts =>
                {
                    var viewFamilyType = doc.OfClass<ViewFamilyType>()
                       .Cast<ViewFamilyType>()
                       .FirstOrDefault(vft => vft.ViewFamily == ViewFamily.ThreeDimensional);
                    //新建的三维视图
                    var view3D = View3D.CreateIsometric(doc, viewFamilyType.Id);
                    if (doc.ActiveView is not ViewSection viewSection)
                    {
                        viewSection = doc.OfClass<View>().Cast<View>().FirstOrDefault(v => v.Name == element.Name && v.ViewType == ViewType.Section && !v.IsTemplate) as ViewSection;
                    }
                    view3D.IsSectionBoxActive = true;
                    doc.Regenerate();
                    //最新添加的即是当前复制视图的剖面框
                    //var cropBoxElement = view3D.OfCategory(BuiltInCategory.OST_SectionBox).Last();
                    //实际位置的BoundingBox
                    //var bounding = element.get_BoundingBox(viewSection);
                    //相对剖面的BoundingBox,准确的剖面框大小,具有transform
                    var boundingBox = viewSection.CropBox;
                    //var b = Transform.CreateRotationAtPoint(viewSection.RightDirection, Math.PI / 2, viewSection.Origin);
                    //重新构造一个变换，由于视图的变换r x v = u满足左手定则，与全局坐标系右手定则不一样，将其坐标轴修改为全局坐标系的一样的右手定则
                    var transform = Transform.Identity;
                    transform.BasisX = viewSection.RightDirection;
                    //Y轴取反
                    transform.BasisY = -viewSection.ViewDirection;
                    transform.BasisZ = viewSection.UpDirection;
                    transform.Origin = boundingBox.Transform.Origin;
                    //boundingBox.Max.Z固定等于0，因为ViewDirection朝外面向用户，Min的Z值始终小于0，即反向
                    var max = new XYZ(boundingBox.Max.X, -boundingBox.Min.Z, boundingBox.Max.Y);
                    var min = new XYZ(boundingBox.Min.X, -boundingBox.Max.Z, boundingBox.Min.Y);
                    boundingBox.Max = max;
                    boundingBox.Min = min;
                    boundingBox.Transform = transform;

                    boundingBox = NeedExtend ? boundingBox : boundingBox.Extend();
                    view3D.SetSectionBox(boundingBox);
                    //ElementTransformUtils.MoveElement(doc, cropBoxElement.Id, viewSection.Origin);
                    view3D.DisplayStyle = DisplayStyle.ShadingWithEdges;
                    view3D.DetailLevel = ViewDetailLevel.Fine;

                    ts.Commit();
                    uidoc.ActiveView = view3D;
                },
                "重设(剖面)剖面框");
        }
    }
    [RelayCommand(CanExecute = nameof(RevitAddins.RvView.SectionBoxControllerViewModel.CanModify))]
    private void UpdateSectionBox(object obj)
    {
        if (obj is BoundingBoxXYZ boundingBoxXyz)
        {
            setSectionBoxHandler.Raise(uiapp =>
            {
                var uidoc = uiapp.ActiveUIDocument;
                if (uidoc.ActiveView is View3D view3d)
                {
                    uidoc.Document.Invoke(_ =>
                    {
                        view3d?.SetSectionBox(boundingBoxXyz);

                    }, "更新剖面框");
                }
            });
        }
    }
}

public class SectionBox(string name, BoundingBoxXYZ bounding)
{
    public string Name { get; set; } = name;

    public BoundingBoxXYZ Bounding { get; set; } = bounding;
}
public enum SectionBoxType
{
    Element,
    Rectangle,
    ViewSection,
}