@using Microsoft.AspNetCore.Http
@using Microsoft.AspNetCore.Http.Extensions;

@model Groceries.Data.Store
@{
    ViewBag.Title = "Edit Store";

    var returnUrl = Url.Action("Index", new { page = 1 });
    if (Context.Request.GetTypedHeaders().Referer is Uri referer && referer.Host == Context.Request.Host.Host)
    {
        var requestUrl = new UriBuilder
        {
            Scheme = Context.Request.Scheme,
            Host = Context.Request.Host.Host,
            Port = Context.Request.Host.Port.GetValueOrDefault(-1),
            Path = Context.Request.Path.ToString(),
            Query = Context.Request.QueryString.ToString(),
        }.Uri;

        if (referer != requestUrl)
        {
            returnUrl = referer.PathAndQuery;
        }
    }
}

<h1>Edit Store</h1>

<form method="post" asp-action="EditStore">
    <partial name="_StoreForm" />

    <div class="row">
        <button class="button button--primary" type="submit">Save</button>
        <a class="button" href="@returnUrl">Cancel</a>
    </div>
</form>