detect/detect.gui/Classes/ViewModelItem.cs

using System.Collections.Generic;
using detect.gui.Commons;
using ReactiveUI;
using System.Linq;

namespace detect.gui.Classes;

public class ViewModelItem
{
    private readonly RoutingState _router;

    public string? ViewModelTypeName { get; init; }
    public string? Text { get; init; }
    public ViewModelItem? Parent { get; init; }
    public List<ViewModelItem> Children { get; set; } = new List<ViewModelItem>();
    public bool IsAuto { get; init; }
    public bool IsActived { get; set; }
    
    public object? Param { get; set; }

    public ViewModelItem(RoutingState router)
    {
        _router = router;
    }

    public void Goto(object? param = null)
    {
        var v = RouterHelper.GetViewModel(ViewModelTypeName!);
        if (v == null) return;

        IsActived = true;

        Parent?.Children.ForEach(i =>
        {
            if (ViewModelTypeName != i.ViewModelTypeName)
                i.IsActived = false;
        });

        var count = _router.NavigationStack.Count(x => x.GetType().Name == ViewModelTypeName);
        if (count != 0)
        {
            var r = _router.NavigationStack.First(x => x.GetType().Name == ViewModelTypeName);
            v.GetType().GetProperty("Item")!.SetValue(r, param);
            _router.NavigationStack.Remove(r);
            _router.Navigate.Execute(r);
        }
        else
        {
            if (Parent != null)
            {
                Parent.IsActived = true;
                var parentType = Parent.ViewModelTypeName?.GetTypeByName();
                var parentModel = parentType?.Assembly.CreateInstance(parentType.FullName!);
                if (parentModel != null)
                {
                    _router.NavigationStack.Add((IRoutableViewModel)parentModel);
                }
            }

            v.GetType().GetProperty("Item")!.SetValue(v, param);
            _router.Navigate.Execute(v);
        }

        var child = Children.FirstOrDefault(x => x.IsActived);
        if (child == null && Children.Any() && IsAuto)
            Children[0].Goto();
        else if (child != null && Children.Any())
        {
            var c = _router.NavigationStack.First(x => x.GetType().Name == child.ViewModelTypeName);
            _router.NavigationStack.Remove(c);
            _router.Navigate.Execute(c);
        }
    }

    public void Goback()
    {
        IsActived = false;

        var r = _router.NavigationStack.First(x => x.GetType().Name == ViewModelTypeName);
        _router.NavigationStack.Remove(r);

        if (Parent == null) return;

        var p = _router.NavigationStack.First(x => x.GetType().Name == Parent.ViewModelTypeName);
        _router.NavigationStack.Remove(p);
        _router.Navigate.Execute(p);
    }
}