// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

// ReSharper disable UnusedMember.Local
#pragma warning disable CS8602

using System;
using System.Diagnostics;
using System.Reflection;
using System.Net;

namespace SpaceWizards.HttpListener
{
    // TODO https://github.com/dotnet/runtime/issues/19348
    internal static class CookieExtensions
    {
        private static Func<Cookie, string>? s_toServerStringFunc;

        public static string ToServerString(this Cookie cookie)
        {
            s_toServerStringFunc ??= (Func<Cookie, string>)typeof(Cookie).GetMethod("ToServerString", BindingFlags.Instance | BindingFlags.NonPublic)!.CreateDelegate(typeof(Func<Cookie, string>));
            Debug.Assert(s_toServerStringFunc != null, "Reflection failed for Cookie.ToServerString().");
            return s_toServerStringFunc(cookie);
        }

        private static Func<Cookie, Cookie>? s_cloneFunc;

        public static Cookie Clone(this Cookie cookie)
        {
            s_cloneFunc ??= (Func<Cookie, Cookie>)typeof(Cookie).GetMethod("Clone", BindingFlags.Instance | BindingFlags.NonPublic)!.CreateDelegate(typeof(Func<Cookie, Cookie>));
            Debug.Assert(s_cloneFunc != null, "Reflection failed for Cookie.Clone().");
            return s_cloneFunc(cookie);
        }

        private enum CookieVariant
        {
            Unknown,
            Plain,
            Rfc2109,
            Rfc2965,
            Default = Rfc2109
        }

        private static Func<Cookie, CookieVariant>? s_getVariantFunc;

        public static bool IsRfc2965Variant(this Cookie cookie)
        {
            s_getVariantFunc ??= (Func<Cookie, CookieVariant>)typeof(Cookie).GetProperty("Variant", BindingFlags.Instance | BindingFlags.NonPublic)!.GetGetMethod(true)!.CreateDelegate(typeof(Func<Cookie, CookieVariant>));
            Debug.Assert(s_getVariantFunc != null, "Reflection failed for Cookie.Variant.");
            return s_getVariantFunc(cookie) == CookieVariant.Rfc2965;
        }
    }

    internal static class CookieCollectionExtensions
    {
        private static Func<CookieCollection, Cookie, bool, int>? s_internalAddFunc;

        public static int InternalAdd(this CookieCollection cookieCollection, Cookie cookie, bool isStrict)
        {
            s_internalAddFunc ??= (Func<CookieCollection, Cookie, bool, int>)typeof(CookieCollection).GetMethod("InternalAdd", BindingFlags.Instance | BindingFlags.NonPublic)!.CreateDelegate(typeof(Func<CookieCollection, Cookie, bool, int>));
            Debug.Assert(s_internalAddFunc != null, "Reflection failed for CookieCollection.InternalAdd().");
            return s_internalAddFunc(cookieCollection, cookie, isStrict);
        }
    }
}