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

using Autodesk.Revit.UI.Selection;

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


namespace Szmedi.Toolkit.RvExtensions;

public static class UIDocumentExtensions
{
    /// <summary>
    ///     运行命令选择元素或选择元素执行操作
    /// </summary>
    public static List<Element> GetSelectedElems(
        this UIDocument uidoc,
        string prompt = "请选择元素",
        ISelectionFilter filter = null,
        ObjectType type = ObjectType.Element
    )
    {
        //取到当前文档。
        Document doc = uidoc.Document;
        //取到当前文档的选择集。
        List<Element> collection = uidoc.Selection.GetElementIds().Select(id => doc.GetElement(id)).ToList();
        if (collection.Any())
        {
            return collection;
        }
        try
        {
            IList<Reference> references =
                filter == null ? uidoc.Selection.PickObjects(type, prompt) : uidoc.Selection.PickObjects(type, filter, prompt);

            collection = references.Select(refer => doc.GetElement(refer)).ToList();
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException) { }

        return collection;
    }

    /// <summary>
    ///     重复命令
    /// </summary>
    /// <param name="uidoc"></param>
    /// <param name="action"></param>
    /// <returns></returns>
    public static void RepeatCommand(this UIDocument uidoc, Action action)
    {
        try
        {
            action?.Invoke();

            uidoc.RepeatCommand(action);
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException) { }
    }

    /// <summary>
    /// 按类型选择元素
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="uidoc"></param>
    /// <param name="prompt"></param>
    /// <param name="objectType"></param>
    /// <returns></returns>
    public static T SelectObject<T>(this UIDocument uidoc, string prompt = "请选择元素", ObjectType objectType = ObjectType.Element)
        where T : Element
    {
        try
        {
            Reference reference = uidoc.Selection.PickObject(objectType, new GenericFilter<T>(), prompt);
            return uidoc.Document.GetElement(reference) as T;
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException)
        {
            return null;
        }
    }

    /// <summary>
    /// 按类型框选元素
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="uidoc"></param>
    /// <param name="prompt"></param>
    /// <returns></returns>
    public static IList<T> SelectObjectsByRectangle<T>(this UIDocument uidoc, string prompt = "请框选元素")
        where T : Element
    {
        try
        {
            return uidoc.Selection.PickElementsByRectangle(new GenericFilter<T>(), prompt).Cast<T>().ToList();
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException)
        {
            return null;
        }
    }
    /// <summary>
    /// 选择元素
    /// </summary>
    /// <param name="uidoc"></param>
    /// <param name="prompt"></param>
    /// <param name="objectType"></param>
    /// <returns></returns>
    public static Element SelectObject(
        this UIDocument uidoc,
        FuncFilter funcFilter,
        string prompt = "请选择元素",
        ObjectType objectType = ObjectType.Element
    )
    {
        try
        {
            var reference = uidoc.Selection.PickObject(objectType, funcFilter, prompt);
            return uidoc.Document.GetElement(reference);
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException)
        {
            return null;
        }
    }
    public static List<Element> SelectObjects(
        this UIDocument uidoc,
        FuncFilter funcFilter,
        string prompt = "请选择元素",
        ObjectType objectType = ObjectType.Element
    )
    {
        try
        {
            var references = uidoc.Selection.PickObjects(objectType, funcFilter, prompt);
            return [.. references.Select(uidoc.Document.GetElement)];
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException)
        {
            return null;
        }
    }

    /// <summary>
    /// 按类型选择多个元素
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="uidoc"></param>
    /// <param name="objectType"></param>
    /// <param name="prompt"></param>
    /// <returns></returns>
    public static List<T> SelectObjects<T>(this UIDocument uidoc, string prompt = "请选择多个元素", ObjectType objectType = ObjectType.Element)
        where T : Element
    {
        try
        {
            IList<Reference> references = uidoc.Selection.PickObjects(objectType, new GenericFilter<T>(), prompt);

            return references.Select(refer => uidoc.Document.GetElement(refer) as T).ToList();
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException)
        {
            return [];
        }
    }
}