using System;
using System.Reflection;
using System.Windows;

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

using Sai.Toolkit.Revit.Assist;

namespace RvAddinTest;
[Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public class DeleteCmd : IExternalCommand
{
    public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
    {
        //程序UI界面
        var uiapp = commandData.Application;
        //获取元素（选择） 显示元素 视图（活动视图）管理（对象）
        var uidoc = uiapp.ActiveUIDocument;
        //程序
        var app = uiapp.Application;
        //获取位置和场地 视图（多个视图）管理 获取元素（Revit 项目里的全部元素）
        var doc = uidoc.Document;
        //获取所有打开文档
        var docset = uiapp.Application.Documents;
        //当前视图
        var view = doc.ActiveView;

        #region FilterExecute
        //if (doc.IsFamilyDocument)
        //{
        //    var manager = doc.FamilyManager;
        //    using (var trans = new Transaction(doc, "default"))
        //    {
        //        try
        //        {
        //            trans.Start();
        //            var param = manager.AddParameter(
        //                 "测试",
        //                 BuiltInParameterGroup.PG_ADSK_MODEL_PROPERTIES,
        //                 ParameterType.Number,
        //                 true);
        //            trans.Commit();
        //        }
        //        catch (Exception ex)
        //        {
        //            throw ex;
        //        }
        //    }
        //}
        var docType = doc.GetType();
        var method = docType.GetMethod("GetUnusedFamilies", BindingFlags.NonPublic | BindingFlags.Instance);
        if (method != null)
        {
            var unusedFamilyIds = method.Invoke(doc, null) as ISet<ElementId>;
            using (var trans = new Transaction(doc, nameof(DeleteCmd)))
            {
                trans.Start();
                //foreach (var id in unusedFamilyIds)
                //{
                //    doc.Delete(id);
                //}
                MessageBox.Show(unusedFamilyIds.Count.ToString());
                trans.Commit();
            }
        }
        //var instances = new FilteredElementCollector(doc).OfClass(typeof(Pipe)).ToElements();
        //using (Transaction trans = new Transaction(doc, "default"))
        //{
        //    try
        //    {
        //        trans.Start();
        //        var ids = new List<ElementId>();
        //        foreach (Pipe pipe in instances)
        //        {
        //            if (Math.Abs(pipe.Diameter - 32 / 304.8) < 10E-5)
        //            {
        //                ids.Add(pipe.Id);
        //            }
        //        }
        //        //doc.Delete(ids);
        //        uidoc.Selection.SetElementIds(ids);
        //        //Do Something.
        //        trans.Commit();
        //    }
        //    catch (Exception ex)
        //    {
        //        message = ex.Message;
        //        if (trans.GetStatus() == TransactionStatus.Started)
        //        {
        //            trans.RollBack();
        //        }
        //        return Result.Failed;
        //    }
        //}

        #endregion FilterExecute

        return Result.Succeeded;
    }
}