using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;

using Nice3point.Revit.Toolkit.External;

namespace ShrlAlgo.Addin.Test;

[Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public class InstancesCreator : ExternalCommand
{
    public override void Execute()
    {
        var doc = Document;
        var uidoc = UiDocument;
        //var uidoc = uiApplication.ActiveUIDocument;
        //var doc = uidoc.Document;
        var ids = uidoc.Selection.GetElementIds();

        using (Transaction ts = new(doc, "旋转"))
        {
            ts.Start();
            var collector = new FilteredElementCollector(doc, doc.ActiveView.Id).OfClass(typeof(TextNote));
            foreach (var id in ids)
            {
                var elem = doc.GetElement(id);
                var loc = elem.Location as LocationPoint;
                var point = loc.Point;
                XYZ flattenXY = new(loc.Point.X, loc.Point.Y, 0);
                var tempDistance = double.MaxValue;
                TextNote textNoteNearest = null;
                var vector = XYZ.BasisX;
                foreach (var element in collector)
                {
                    var textNote = element as TextNote;
                    XYZ flattenCoord = new(textNote.Coord.X, textNote.Coord.Y, 0);
                    var currentDistance = flattenCoord.DistanceTo(flattenXY);
                    if (currentDistance < tempDistance)
                    {
                        tempDistance = currentDistance;
                        textNoteNearest = textNote;
                        vector = textNote.BaseDirection;
                    }
                }
                if (textNoteNearest == null)
                {
                    continue;
                }
                var radian = XYZ.BasisX.AngleTo(vector);

                var crossProduct = XYZ.BasisX.CrossProduct(textNoteNearest.BaseDirection).Normalize();
                if (Math.Abs(radian - Math.PI) < 10E-6)
                {
                    ElementTransformUtils.RotateElement(doc, id, Line.CreateUnbound(point, XYZ.BasisZ), Math.PI);
                }
                if (crossProduct.IsAlmostEqualTo(XYZ.BasisZ))
                {
                    ElementTransformUtils.RotateElement(doc, id, Line.CreateUnbound(point, XYZ.BasisZ), radian);
                }
                if (crossProduct.IsAlmostEqualTo(-XYZ.BasisZ))
                {
                    ElementTransformUtils.RotateElement(doc, id, Line.CreateUnbound(point, XYZ.BasisZ), 2 * Math.PI - radian);
                }
            }
            ts.Commit();
        }

        //MainWindow window = new MainWindow(Document);
        //window.ShowDialog();
    }
}