using System;
using System.Threading;
using System.Threading.Tasks;
using LCU.API.Collections.RepoApi.Configuration;
using LCU.Shared.Collections.RepoApiLib.Hosted;
using LCU.Shared.Realtime.QueueLib.Models;
using LCU.Shared.Realtime.QueueLib.Queue;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Serilog;

namespace LCU.API.Collections.RepoApi.HostedServices
{
    public class HostedRepoTaskConsumer : BackgroundService, IQueueItemProcessor
    {
        private readonly IServiceScopeFactory _scopeFactory;
        private readonly IQueueConnectionConfig _configuration;
        private readonly IQueueConsumerConfig _consumerConfig;

        public HostedRepoTaskConsumer(IQueueConnectionConfig configuration, RepoApiConfiguration repoApiConfiguration, IServiceScopeFactory scopeFactory)
        {
            _configuration = configuration;
            _scopeFactory = scopeFactory;
            _consumerConfig = repoApiConfiguration.QueueConsumerConfigs["RepoProcessorTask"];
        }

        protected override async Task ExecuteAsync(CancellationToken cancellationToken)
        {
            Log.Information("Hosted Queue Producer is starting.");

            try
            {
                var proxyQueue = new QueueItemConsumer(_configuration, _consumerConfig, this);

                await proxyQueue.ProcessItems(cancellationToken, true, 0);
            }
            catch (TaskCanceledException ex) when (cancellationToken.IsCancellationRequested)
            {
                Log.Information(ex, "Repo Producer was shut down normally.");
            } 
            catch (Exception ex)
            {
                Log.Error(ex, "Error in main thread for HostedRepoTaskConsumer");
            }

            Log.Information("Hosted Repo Producer is stopping.");
        }

        public void HandleItem(QueueItem item)
        {
            var settings = new TaskSettings();

            using (var scope = _scopeFactory.CreateScope())
            {
                var queueProducerService = scope.ServiceProvider.GetRequiredService<IRepoQueueProducerService>();
                queueProducerService.ImportData(settings).GetAwaiter().GetResult();
            }
        }
    }
}