@using Microsoft.AspNetCore.Components.Routing
@using Oqtane.Themes
@using Oqtane.Services
@using Oqtane.Models;
@using Oqtane.Security
@namespace Oqtane.Themes.Controls
@inherits ThemeObjectBase
@inject IPageService PageService
@inject IUserService UserService

<ul class="nav flex-column">
    @if (parent != null)
    {
        string url = NavigateUrl();
        <li class="nav-item px-3">
            <NavLink class="nav-link" href="@parent.Path" Match="NavLinkMatch.All">
                <span class="oi oi-media-skip-backward" aria-hidden="true"></span> Back
            </NavLink>
        </li>
    }
    @foreach (var p in pages)
    {
        if (p.IsNavigation && UserSecurity.IsAuthorized(PageState.User, "View", p.Permissions))
        {
            string url = NavigateUrl(p.Path);
            <li class="nav-item px-3">
                <NavLink @key="@p.PageId" class="nav-link" href="@url" Match="NavLinkMatch.All">
                    <span class="oi @p.Icon" aria-hidden="true"></span> @p.Name
                </NavLink>
            </li>
        }
    }
</ul>

@code {
    List<Page> pages;
    Page parent = null;

    protected override Task OnParametersSetAsync()
    {
        // if current page has no children
        if (PageState.Pages.Where(item => item.ParentId == PageState.Page.PageId).FirstOrDefault() == null)
        {
            // display list of pages which have same parent as current page
            pages = PageState.Pages.Where(item => item.ParentId == PageState.Page.ParentId).OrderBy(item => item.Order).ToList();
            // if current page has parent
            if (PageState.Page.ParentId != null)
            {
                parent = PageState.Pages.Where(item => item.PageId == PageState.Page.ParentId).FirstOrDefault();
            }
        }
        else
        {
            // display list of pages which are children of current page
            pages = PageState.Pages.Where(item => item.ParentId == PageState.Page.PageId).OrderBy(item => item.Order).ToList();
            // current page is parent
            parent = PageState.Pages.Where(item => item.ParentId == PageState.Page.ParentId).FirstOrDefault();
        }
        return Task.CompletedTask;
    }
}