using Microsoft.ApplicationInsights;
using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Channels;
using System.Threading.Tasks;

namespace Core.Telemetry
{
    public class SeqBackgroundService : BackgroundService
    {
        private readonly Channel<string> _channel;
        private readonly HttpClient _client;
        private readonly string _url;
        private readonly TelemetryClient _telemetryClient;

        public SeqBackgroundService(TelemetryClient telemetryClient, Configurations.IConfiguration configuration)
        {
            _telemetryClient = telemetryClient;
            _url = configuration["Seq:Url"]; // eller hvor din Seq URL kommer fra
            _client = new HttpClient();
            _channel = Channel.CreateUnbounded<string>();
        }

        public void EnqueueMessage(string message)
        {
            _channel.Writer.TryWrite(message);
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (!stoppingToken.IsCancellationRequested)
            {
                try
                {
                    await foreach (var message in _channel.Reader.ReadAllAsync(stoppingToken))
                    {
                        await _client.PostAsync(_url, new StringContent(message), stoppingToken);
                    }
                }
                catch (Exception ex)
                {
                    _telemetryClient.TrackException(ex);
                }
            }
        }

        public override async Task StopAsync(CancellationToken cancellationToken)
        {
            _channel.Writer.Complete();
            await base.StopAsync(cancellationToken);
        }
    }
}