using System.ComponentModel.DataAnnotations;
using System.Linq;

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

using Nice3point.Revit.Toolkit.External.Handlers;

namespace Szmedi.RvKits.Civil;

public partial class FloorFinishesViewModel : ObservableValidator
{
    public FloorFinishesViewModel(List<FloorType> floorTypes)
    {
        FloorTypes = floorTypes;

        finishesHandler = new ActionEventHandler();
    }

    private readonly ActionEventHandler finishesHandler;

    private double floorOffset;

    [Required]
    [Range(-6000, 6000, ErrorMessage = "输入偏移量值范围有误")]
    //[CustomValidation(typeof(FloorFinishesViewModel), nameof(ValidateFloorOffset))]
    public double FloorOffset
    {
        get => floorOffset;
        set
        {
            SetProperty(ref floorOffset, value, true);
            PlaceFloorCommand.NotifyCanExecuteChanged();
        }
    }

    //自定义验证方法
    //public static ValidationResult ValidateFloorOffset(string floorOffset, ValidationContext context)
    //{
    //    FloorFinishesViewModel instance = (FloorFinishesViewModel)context.ObjectInstance;
    //    bool isValid = double.TryParse(floorOffset, out var _);
    //    if (isValid)
    //    {
    //        return ValidationResult.Success;
    //    }

    //    return new("输入内容不是数值。");
    //}

    [ObservableProperty]
    private bool rbAllRooms;

    [ObservableProperty]
    [NotifyCanExecuteChangedFor(nameof(PlaceFloorCommand))]
    private FloorType selectedFloorType;

    private bool CanPlace => SelectedFloorType != null && !HasErrors;

    public IList<FloorType> FloorTypes { get; }

    private IEnumerable<Room> selectedRooms;

    [RelayCommand(CanExecute = nameof(CanPlace))]
    private void PlaceFloor()
    {
        finishesHandler.Raise(app =>
        {
            UIDocument uidoc = app.ActiveUIDocument;
            GetRoomsToPlace(uidoc);
            CreateFloors(uidoc);
        });
    }

    public void CreateFloors(UIDocument uidoc)
    {
        Document document = uidoc.Document;
        document.Invoke(
            _ =>
            {
                foreach (Room room in selectedRooms)
                {
                    if (room != null && room.UnboundedHeight != 0.0)
                    {
                        //UnitFormatUtils.TryParse(doc.GetUnits(), UnitType.UT_Length, FloorOffset, out double value);

                        SpatialElementBoundaryOptions option = new()
                        {
                            SpatialElementBoundaryLocation = SpatialElementBoundaryLocation.Finish
                        };
                        IList<IList<BoundarySegment>> blist = room.GetBoundarySegments(option);
                        CurveArray curveArray = new();
                        foreach (BoundarySegment bs in blist[0])
                        {
                            curveArray.Append(bs.GetCurve());
                        }

                        Level level = document.GetElement(room.LevelId) as Level;
                        if (curveArray.Size != 0)
                        {
                            document.Create
                                .NewFloor(curveArray, SelectedFloorType, level, false)
                                .get_Parameter(BuiltInParameter.FLOOR_HEIGHTABOVELEVEL_PARAM)
                                .Set(FloorOffset / 304.8);
                        }
                    }
                }
            },
            "房间饰面"
        );
    }

    private void GetRoomsToPlace(UIDocument uidoc)
    {
        Document doc = uidoc.Document;
        selectedRooms = RbAllRooms
            ? (
                from elem in new FilteredElementCollector(doc, doc.ActiveView.Id).OfClass(typeof(SpatialElement))
                let room = elem as Room
                select room
            )
            : uidoc.Selection.PickElementsByRectangle(new GenericFilter<Room>(), "请框选以选择房间").OfType<Room>();
    }
}