using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Wicture.DbRESTFul;
using Wicture.DbRESTFul.Configuration;

namespace JiaZhiQuan.Common.Messaging
{
    public static class MessagingService
    {
        private static IEnumerable<IConsumer> consumers;
        private static List<Producer> producers;

        public static IApplicationBuilder UserMessageConsumption(this IApplicationBuilder app)
        {
            if (!ConfigurationManager.Settings.Document.ContainsKey(KafkaClientConfig.ConfigSectionName))
            {
                LoggerManager.Logger.Info("No configuration found, ignore message consumption.");
                return app;
            }

            var aft = app.ApplicationServices.GetRequiredService<IHostApplicationLifetime>();
            try
            {
                consumers = app.ApplicationServices.GetServices<IConsumer>();
                if (consumers?.Count() > 0)
                {
                    aft.ApplicationStopping.Register(() =>
                    {
                        consumers.ForEach(c => c.Dispose());
                    });

                    foreach (var consumer in consumers)
                    {
                        consumer.Init();
                        LoggerManager.Logger.Info($"Initialized consumer `{consumer.GetType().Name}`");
                    }
                }
            }
            catch (Exception ex)
            {
                LoggerManager.Logger.Error(ex, "Failed to init consumers.");
            }
            aft.ApplicationStopping.Register(() =>
            {
                producers?.ForEach(p => p?.Dispose());
            });

            return app;
        }

        public static void RegisterProducer(Producer producer)
        {
            if (producers == null) producers = new List<Producer>();
            producers.Add(producer);
        }
    }
}