using System;
using System.Collections.Generic;
using System.Linq;

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

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

using Nice3point.Revit.Toolkit.External.Handlers;


namespace Sai.RvKits.RvMEP
{
    public partial class RotateMEPViewModel : ObservableObject
    {
        [ObservableProperty]
        private double angle;
        [ObservableProperty]
        private bool isSingleSelect = true;
        [RelayCommand]
        private void RotateInstance()
        {
            rotateHandler.Raise(
                uiapp =>
                {
                    var uidoc = uiapp.ActiveUIDocument;
                    var doc = uidoc.Document;
                    ICollection<ElementId> elemIds = [];
                    if (uidoc.Selection.GetElementIds().Any())
                    {
                        elemIds = uidoc.Selection.GetElementIds();
                    }
                    else
                    {
                        if (IsSingleSelect)
                        {
                            var r = uidoc.Selection.PickObject(ObjectType.Element, new FuncFilter(e =>
                            {
                                return e is FamilyInstance && e.GetConnectors().OfType<Connector>().Any(c => c.IsConnected);
                            }), "请选择可以连管的构件");

                            elemIds.Add(r.ElementId);
                        }
                        else
                        {
                            elemIds = uidoc.Selection.PickObjects(ObjectType.Element, new FuncFilter(e =>
                            {
                                return e is FamilyInstance && e.GetConnectors().OfType<Connector>().Any(c => c.IsConnected);
                            }), "请选择可以连管的构件，并完成").Select(r => doc.GetElement(r).Id).ToList();
                        }
                    }

                    foreach (var id in uidoc.Selection.GetElementIds())
                    {
                        var elem = uidoc.Document.GetElement(id);

                        var referConn = elem.GetConnectors().OfType<Connector>().FirstOrDefault(c => c.IsConnected);

                        if (referConn != null)
                        {
                            doc.Invoke(
                                ts =>
                                {
                                    ElementTransformUtils.RotateElement(
                                        doc,
                                        elem.Id,
                                        Line.CreateUnbound(
                                                referConn.CoordinateSystem.Origin,
                                    referConn.CoordinateSystem.BasisZ),
                                        Angle.ToRadian());
                                }, "旋转");
                        }
                    }
                });
        }
        readonly ActionEventHandler rotateHandler = new();
    }
}