using System.Windows;

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

using Nice3point.Revit.Toolkit.External;



namespace ShrlAlgo.RvKits.RvMEP;

[Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public class MoveConnectCmd : ExternalCommand
{
    public override void Execute()
    {
        Reference baseReference;
        Reference moveReference;
        try
        {
            baseReference = UiDocument.Selection.PickObject(
                Autodesk.Revit.UI.Selection.ObjectType.Element,
                new FuncFilter(e => e.GetConnectors(true)?.Size > 0),
                "请选择基准的管线、管件、设备实例"
            );

            moveReference = UiDocument.Selection.PickObject(
                Autodesk.Revit.UI.Selection.ObjectType.Element,
                new FuncFilter(
                    e =>
                        e.Id != baseReference.ElementId
                            && e.GetConnectors(true)?.Size > 0
                ),
                "请选择需要移动连接的管线、管件、设备实例"
            );
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException)
        {
            return;
        }
        var baseElement = Document.GetElement(baseReference);
        var elementToMove = Document.GetElement(moveReference);
        var list = ConnectorAssist.GetNearestDomainConnectors(baseElement, elementToMove);
        if (list.Count != 2)
        {
            MessageBox.Show("缺少可连接的连接件", "提示");
            return;
        }
        Document.Invoke(
            _ =>
            {
                var conn1 = list[0];
                var conn2 = list.Last();
                //if (conn1.Domain != conn2.Domain)//类型不一样不能连接
                //{
                //    return;
                //}
                var origin1 = conn1.Origin;
                var origin2 = conn2.Origin;
                var direction1 = conn1.CoordinateSystem.BasisZ;
                var direction2 = conn2.CoordinateSystem.BasisZ;
                //夹角
                var radian = Math.Acos(direction1.DotProduct(direction2));
                //都是管线，角度小于135,主次分支对齐连接，仅支持中心对齐
                if (
                    baseElement is MEPCurve mainMEPCurve
                    && elementToMove is MEPCurve branchMEPCurve
                    && radian < 135.0.ToRadian()
                )
                {
                    //if ((conn2.Shape == ConnectorProfileType.Oval || conn2.Shape == ConnectorProfileType.Rectangular))
                    //{
                    //    var verticalJustification = mainMEPCurve.get_Parameter(BuiltInParameter.RBS_CURVE_VERT_OFFSET_PARAM);
                    //    var delta = XYZ.BasisZ * (branchMEPCurve.Height / 2 - mainMEPCurve.Height / 2);
                    //    //底部
                    //    if (verticalJustification.AsInteger() == 1)
                    //    {
                    //        origin2 -= delta;
                    //    }
                    //    //顶部
                    //    if (verticalJustification.AsInteger() == 2)
                    //    {
                    //        origin2 += delta;
                    //    }

                    //}
                    //管线所在的垂直于xoy平面的面法向
                    var normal = XYZ.BasisZ.CrossProduct(direction2);
                    //如果是立管，则取不移动的管线的方向，过移动管线做平面
                    if (normal.IsZeroLength())
                    {
                        normal = direction1;
                    }

                    var plane = Plane.CreateByNormalAndOrigin(normal, origin2);
                    //找到交点
                    var intersectPoint = plane.IntersectPoint(Line.CreateUnbound(origin1, direction1));
                    //不相交则直接移动
                    if (intersectPoint == null)
                    {
                        ElementTransformUtils.MoveElement(Document, elementToMove!.Id, origin1 - origin2);
                    }
                    else
                    {
                        //避免交点在原管线外，导致反向连接
                        if ((mainMEPCurve.GetCurve() as Line).IsInsideEx(intersectPoint, 0.5))
                        {
                            ElementTransformUtils.MoveElement(Document, elementToMove!.Id, intersectPoint - origin2);
                        }
                        else
                        {
                            ElementTransformUtils.MoveElement(Document, elementToMove!.Id, origin1 - origin2);
                        }
                    }
                    mainMEPCurve.ConnectTo(branchMEPCurve);
                }
                else
                {
                    if (baseElement is MEPCurve baseMEPCurve && elementToMove is MEPCurve moveMEPCurve)
                    {
                        if (
                            (
                                conn2.Shape == ConnectorProfileType.Oval
                                || conn2.Shape == ConnectorProfileType.Rectangular
                            )
                        )
                        {
                            var verticalJustification = baseMEPCurve.get_Parameter(
                                BuiltInParameter.RBS_CURVE_VERT_OFFSET_PARAM
                            );

                            var delta = XYZ.BasisZ * (baseMEPCurve.Height / 2 - moveMEPCurve.Height / 2);
                            //底部
                            if (verticalJustification.AsInteger() == 1)
                            {
                                origin2 += delta;
                            }
                            //顶部
                            if (verticalJustification.AsInteger() == 2)
                            {
                                origin2 -= delta;
                            }
                        }
                    }
                    var xyz = origin1 - origin2;

                    Document.InvokeSub(_ =>
                    {
                        if (!xyz.IsZeroLength())
                        {
                            ElementTransformUtils.MoveElement(Document, elementToMove!.Id, xyz);
                        }
                    });
                    if (direction1.IsAlmostEqualTo(direction2.Negate())) //对齐
                    {
                        conn1.ConnectByFitting(conn2);
                    }
                    else
                    {
                        var xyz2 = direction1.CrossProduct(direction2); //旋转轴方向
                        if (direction1.IsAlmostEqualTo(direction2))
                        {
                            xyz2 = conn1.CoordinateSystem.BasisY;
                        }
                        var line = Line.CreateUnbound(origin1, xyz2);
                        var angle = direction1.AngleTo(direction2);
                        //互补角
                        var complementaryAngle = Math.PI - angle;

                        ElementTransformUtils.RotateElement(Document, elementToMove!.Id, line, complementaryAngle);

                        conn1.ConnectByFitting(conn2);
                    }
                }
            },
            "移动连接"
        );
    }
}