// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using AngleSharp.Dom;
using AngleSharp.Dom.Html;

namespace Microsoft.AspNetCore.Mvc.FunctionalTests
{
    public static class IHtmlDocumentExtensions
    {
        public static IElement RequiredQuerySelector(this IHtmlDocument document, string selector)
        {
            var element = document.QuerySelector(selector);
            if (element == null)
            {
                throw new ArgumentException($"Document does not contain element that matches the selector {selector}: " + Environment.NewLine + document.DocumentElement.OuterHtml);
            }

            return element;
        }

        public static string RetrieveAntiforgeryToken(this IHtmlDocument htmlDocument)
        {
            var hiddenInputs = htmlDocument.QuerySelectorAll("form input[type=hidden]");
            foreach (var input in hiddenInputs)
            {
                if (!input.HasAttribute("name"))
                {
                    continue;
                }

                var name = input.GetAttribute("name");
                if (name == "__RequestVerificationToken" || name == "HtmlEncode[[__RequestVerificationToken]]")
                {
                    return input.GetAttribute("value");
                }
            }

            throw new Exception($"Antiforgery token could not be located in {htmlDocument.Source.Text}.");
        }
    }
}