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

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

using Nice3point.Revit.Toolkit.External.Handlers;

using RandomColorGenerator;


namespace Sai.RvKits.RvMEP;

public partial class HeadroomCheckViewModel : ObservableObject
{
    private readonly UIApplication uiapp;

    public HeadroomCheckViewModel(UIApplication uiapp)
    {
        this.uiapp = uiapp;
        document = uiapp.ActiveUIDocument.Document;
        Rooms = GetRoomItems();
        checkHeadroom = new ActionEventHandler();
        generateRoom3d = new ActionEventHandler();
    }
    private readonly ActionEventHandler checkHeadroom;
    private readonly ActionEventHandler generateRoom3d;
    private readonly Document document;

    [ObservableProperty]
    private List<RoomCheckItem> rooms;
    private List<RoomCheckItem> GetRoomItems()
    {
        var roomItems = new List<RoomCheckItem>();
        var allRooms = uiapp.ActiveUIDocument.Document.OfClass<SpatialElement>().OfType<Room>();
        var groups = allRooms.GroupBy(r => r.Name);
        IEnumerable<IGrouping<string, Room>> enumerable = groups as IGrouping<string, Room>[] ?? groups.ToArray();
        var colors = GetRandomColors(enumerable.Count());
        for (int i = 0; i < enumerable.Count(); i++)
        {
            var group = enumerable.ElementAt(i);
            var color = colors.ElementAt(i);
            foreach (var room in group)
            {
                var r = new RoomCheckItem()
                {
                    Room = room,
                    Name = room.Name,
                    Color = color,
                };
                roomItems.Add(r);
            }
        }
        return roomItems;
    }
    private static IEnumerable<Color> GetRandomColors(int count)
    {
        var colors = RandomColor.GetColors(ColorScheme.Random, Luminosity.Light, count);

        return colors.Select(color => new Color(color.R, color.G, color.B));
    }
    private bool CanClick()
    {
        return Rooms.Any();
    }
    [RelayCommand(CanExecute = nameof(CanClick))]
    private void AnalysisHeadroom()
    {
        checkHeadroom.Raise(_ =>
        {
            var view = document.ActiveView;
            //var elev = view.GenLevel.Bottom;
            document.Invoke(_ =>
            {
                ElementClassFilter filter = new(typeof(Floor));
                foreach (var item in Rooms)
                {
                    var room = item.Room;
                    Level baseLevel = room.Level;
                    var levels = document.OfClass<Level>().Cast<Level>();
                    Level aboveLevel = null;
                    double tempElev = double.MaxValue;
                    foreach (var level in levels)
                    {
                        if (level.Elevation > baseLevel.Elevation && (level.Elevation - baseLevel.Elevation) < tempElev)
                        {
                            aboveLevel = level;
                            tempElev = level.Elevation;
                        }
                    }

                    Element hitBottomElement = null;
                    Element hitTopElement = null;
                    document.XRayFindNearest(filter, FindReferenceTarget.Element, room.GetLocXYZ(), -XYZ.BasisZ, ref hitBottomElement);
                    document.XRayFindNearest(filter, FindReferenceTarget.Element, room.GetLocXYZ(), XYZ.BasisZ, ref hitTopElement);
                    if (hitBottomElement is Floor bottomFloor && bottomFloor.LevelId == baseLevel.Id)//击中的楼板是上层的楼板
                    {
                        //绝对标高
                        var baseOffset = bottomFloor.get_Parameter(BuiltInParameter.STRUCTURAL_ELEVATION_AT_BOTTOM).AsDouble();
                        //底部偏移
                        room.BaseOffset = baseOffset - baseLevel.Elevation;
                    }
                    else//找不到楼板则为0
                    {
                        room.BaseOffset = 0;
                    }

                    if (hitTopElement is Floor topFloor && topFloor.LevelId == aboveLevel?.Id)//击中的楼板是当前的楼板
                    {
                        //绝对标高
                        var limitOffset = topFloor.get_Parameter(BuiltInParameter.STRUCTURAL_ELEVATION_AT_TOP).AsDouble();
                        //高度偏移
                        room.LimitOffset = limitOffset - room.UpperLimit.Elevation;
                        //全部高度
                        //view.GetViewRange().GetLevelId(PlanViewPlane.TopClipPlane)
                        //item.Room
                    }
                    else//找不到楼板则为上部标高
                    {
                        room.LimitOffset = aboveLevel.Elevation - room.UpperLimit.Elevation;
                    }
                    document.Regenerate();
                    var elements = room.GetIntersectElements().Where(e => e is MEPCurve || e.Category.Id == new ElementId(BuiltInCategory.OST_StructuralFraming));
                    foreach (var elem in elements)
                    {
                        var boundingBox = elem.get_BoundingBox(view);
                        //最低绝对标高
                        var roomTopOffset = boundingBox.Min.Z;
                        room.LimitOffset = roomTopOffset - room.UpperLimit.Elevation;
                    }
                }
            });
        });
    }
    [RelayCommand(CanExecute = nameof(CanClick))]
    private void GenerateRoom3D()
    {
        document.Invoke(_ =>
        {
            var list = new List<GeometryObject>();
            DirectShape ds = DirectShape.CreateElement(document, new ElementId(BuiltInCategory.OST_GenericModel));
            FillPatternElement solidFillPattern = document
                .OfClass<FillPatternElement>()
                .Cast<FillPatternElement>()
                .FirstOrDefault(a => a.GetFillPattern().IsSolidFill);
            foreach (var item in Rooms)
            {
                list.Add(item.Room.GetSolid());
                Color color = item.Color;
                //TextNote.Create(document, viewId, position, text, options)
                OverrideGraphicSettings ogs = new();
                ogs.SetProjectionLineColor(color);
#if REVIT2018
                ogs.SetSurfaceTransparency(50);
                ogs.SetProjectionFillColor(color);
                ogs.SetProjectionFillPatternId(solidFillPattern.Id);

                ogs.SetCutFillColor(color);
                ogs.SetCutFillPatternId(solidFillPattern.Id);
                document.ActiveView.SetElementOverrides(ds.Id, ogs);
#else
                ogs.SetSurfaceBackgroundPatternColor(color);
                ogs.SetSurfaceForegroundPatternId(solidFillPattern.Id);
                ogs.SetSurfaceForegroundPatternColor(color);

                ogs.SetCutBackgroundPatternColor(color);
                ogs.SetCutForegroundPatternColor(color);
                ogs.SetCutForegroundPatternId(solidFillPattern.Id);
                ogs.SetSurfaceTransparency(50);
                document.ActiveView.SetElementOverrides(ds.Id, ogs);
#endif
            }
            ds.AppendShape(list);
        }, "创建三维房间实体");
    }
}