@model NavigationModel
@using SmartStore.Core.Domain.Catalog;
@using SmartStore.Web.Models.Catalog;
@using SmartStore.Collections;

@functions {
    private string GetCssClassForNode(NodePathState state) 
    {
        var liClasses = new List<string>();

        if ((state & NodePathState.Parent) == NodePathState.Parent)
        {
            liClasses.Add("parent");
        }

        if ((state & NodePathState.Expanded) == NodePathState.Expanded)
        {
            liClasses.Add("expanded");
        }

        if ((state & NodePathState.Selected) == NodePathState.Selected)
        {
            liClasses.Add("selected");
        }

        return liClasses.Count > 0 ? String.Join(" ", liClasses) : null;
    }

    private bool ShouldRenderChildren(NodePathState state)
    {
        if (!((state & NodePathState.Parent) == NodePathState.Parent) || !Model.Path.Any())
            return false;

        if ((state & NodePathState.Expanded) == NodePathState.Expanded || (state & NodePathState.Selected) == NodePathState.Selected)
        {
            return true;
        }
        
        return false;
    }
}

@if (Model.Root.HasChildren)
{
    <div class="block block-bordered block-category-navigation">
        <div class="block-title">
            @T("Categories")
        </div>
        <div class="block-body listbox">
            <nav class="nav-category">
                @CreateMenu(Model.Root.Children, "level-1")
            </nav>
        </div>
    </div>
}

@helper CreateMenu(IEnumerable<TreeNode<MenuItem>> nodes, string menuSelector) {
    <ul class="@menuSelector">
        @foreach (var node in nodes)
        {
            var state = node.GetNodePathState(Model.Path);
			var url = node.Value.GenerateUrl(this.Url);
            <li class="@GetCssClassForNode(state)">
                <a href="@url">@node.Value.Text
                    @if ((node.Value.ElementsCount ?? 0) > 0)
                    {
                        <text> (@(node.Value.ElementsCount))</text>
                    }
                </a>
                @if (ShouldRenderChildren(state))
                {
                    @CreateMenu(node.Children, "sub-level-" + (node.Depth + 2))
                }
            </li>
        }
    </ul>
}