using System;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using JetBrains.Annotations;
using WireMock.HttpsCertificate;
using WireMock.Validation;

namespace WireMock.Http
{
    internal static class HttpClientHelper
    {
        public static HttpClient CreateHttpClient(string clientX509Certificate2ThumbprintOrSubjectName = null)
        {
#if NETSTANDARD
            var handler = new HttpClientHandler
            {
                CheckCertificateRevocationList = false,
                SslProtocols = System.Security.Authentication.SslProtocols.Tls12 | System.Security.Authentication.SslProtocols.Tls11 | System.Security.Authentication.SslProtocols.Tls,
                ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => true,
                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
            };
#elif NET46
            var handler = new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => true,
                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
            };
            ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;
#else
            var handler = new WebRequestHandler
            {
                ServerCertificateValidationCallback = (sender, certificate, chain, errors) => true,
                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
            };
            ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;
#endif

            if (!string.IsNullOrEmpty(clientX509Certificate2ThumbprintOrSubjectName))
            {
                handler.ClientCertificateOptions = ClientCertificateOption.Manual;

                var x509Certificate2 = ClientCertificateHelper.GetCertificate(clientX509Certificate2ThumbprintOrSubjectName);
                handler.ClientCertificates.Add(x509Certificate2);
            }

            // For proxy we shouldn't follow auto redirects
            handler.AllowAutoRedirect = false;

            // If UseCookies enabled, httpClient ignores Cookie header
            handler.UseCookies = false;

            var client = new HttpClient(handler);
#if NET452 || NET46
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
#endif
            return client;
        }

        public static async Task<ResponseMessage> SendAsync([NotNull] HttpClient client, [NotNull] RequestMessage requestMessage, string url)
        {
            Check.NotNull(client, nameof(client));
            Check.NotNull(requestMessage, nameof(requestMessage));

            var originalUri = new Uri(requestMessage.Url);
            var requiredUri = new Uri(url);

            // Create HttpRequestMessage
            var httpRequestMessage = HttpRequestMessageHelper.Create(requestMessage, url);

            // Call the URL
            var httpResponseMessage = await client.SendAsync(httpRequestMessage, HttpCompletionOption.ResponseContentRead);

            // Create ResponseMessage
            return await HttpResponseMessageHelper.Create(httpResponseMessage, requiredUri, originalUri);
        }
    }
}