// ==========================================================================
//  WebhookSender.cs
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex Group
//  All rights reserved.
// ==========================================================================

using System;
using System.Diagnostics;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Squidex.Infrastructure.Http;

namespace Squidex.Domain.Apps.Read.Webhooks
{
    public class WebhookSender
    {
        private static readonly TimeSpan Timeout = TimeSpan.FromSeconds(2);

        public virtual async Task<(string Dump, WebhookResult Result, TimeSpan Elapsed)> SendAsync(WebhookJob job)
        {
            try
            {
                var request = BuildRequest(job);
                HttpResponseMessage response = null;

                var responseString = string.Empty;

                var isTimeout = false;

                var watch = Stopwatch.StartNew();

                try
                {
                    using (var client = new HttpClient { Timeout = Timeout })
                    {
                        response = await client.SendAsync(request);
                    }
                }
                catch (TimeoutException)
                {
                    isTimeout = true;
                }
                catch (OperationCanceledException)
                {
                    isTimeout = true;
                }
                catch (Exception ex)
                {
                    responseString = ex.Message;
                }
                finally
                {
                    watch.Stop();
                }

                if (response != null)
                {
                    responseString = await response.Content.ReadAsStringAsync();
                }

                var dump = DumpFormatter.BuildDump(request, response, job.RequestBody, responseString, watch.Elapsed, isTimeout);

                var result = WebhookResult.Failed;

                if (isTimeout)
                {
                    result = WebhookResult.Timeout;
                }
                else if (response?.IsSuccessStatusCode == true)
                {
                    result = WebhookResult.Success;
                }

                return (dump, result, watch.Elapsed);
            }
            catch (Exception ex)
            {
                return (ex.Message, WebhookResult.Failed, TimeSpan.Zero);
            }
        }

        private static HttpRequestMessage BuildRequest(WebhookJob job)
        {
            var request = new HttpRequestMessage(HttpMethod.Post, job.RequestUrl)
            {
                Content = new StringContent(job.RequestBody, Encoding.UTF8, "application/json")
            };

            request.Headers.Add("X-Signature", job.RequestSignature);
            request.Headers.Add("User-Agent", "Squidex Webhook");

            return request;
        }
    }
}