@model PagingData
@{
    bool has_previous = Model.CurrentPage > 0;
    bool has_next = Model.CurrentPage < Model.LastPage;

    int first_page = Math.Max( 0 , Model.CurrentPage - 3 );
    int last_page = Math.Min( first_page + 6 , Model.LastPage );
    if ( last_page - first_page < 6 )
        first_page = Math.Max( 0 , last_page - 6 );

    bool show_dots_before = first_page > 0;
    if ( show_dots_before ) 
        first_page += 2; // shift first page to make room for [1][...]

    bool show_dots_after = last_page < Model.LastPage;
    if (show_dots_after)
        last_page -= 2; // shift last page to make room for [...][last]
}

@if ( Model.LastPage > 0 )
{
<nav>
    <ul class="pagination justify-content-center pagination-sm">
    
        <li class="page-item @(has_previous ? "" : "disabled")">
          <a class="page-link" href="@Model.Url( Model.CurrentPage - 1 )" tabindex="-1">Previous</a>
        </li>

    @if ( show_dots_before )
    {
        <li class="page-item"><a class="page-link" href="@Model.Url( 0 )">1</a></li>
        <li class="page-item disabled"><span class="page-link">...</span></li>
    }

    @for ( int p = first_page ; p <= last_page; p++ )
    {
        if ( Model.CurrentPage == p )
        {
            <li class="page-item active"><span class="page-link">@(p+1)</span></li>
        }
        else
        {
            <li class="page-item"><a class="page-link" href="@Model.Url( p )">@(p+1)</a></li>
        }
    }

    @if ( show_dots_after )
    {
        <li class="page-item disabled"><span class="page-link">...</span></li>
        <li class="page-item"><a class="page-link" href="@Model.Url( Model.LastPage )">@( Model.LastPage + 1 )</a></li>
    }

        <li class="page-item @(has_next ? "" : "disabled")">
          <a class="page-link" href="@Model.Url( Model.CurrentPage + 1 )" tabindex="-1">Next</a>
        </li>

    </ul>
</nav>
}