using Microsoft.Extensions.Logging;
using PARR.EsppTemplateSync.Services;
using PARR.EsppTemplateSync.Settings;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System.Text;

namespace PARR.EsppTemplateSync
{
    internal class TemplateMQSyncer : ITemplateSyncer
    {
        private readonly ILogger<TemplateMQSyncer> logger;
        private readonly IManager manager;
        private readonly GlobalSettings globalSettings;
        private IConnection connection;
        private RabbitMQ.Client.IModel channel;

        public TemplateMQSyncer(
            ILogger<TemplateMQSyncer> logger,
            IManager manager,
            GlobalSettings globalSettings
            )
        {
            this.logger = logger;
            this.manager = manager;
            this.globalSettings = globalSettings;
            if (globalSettings.MqSettings == null)
            {
                logger.LogError("Нет секции настроек хранилища. MqSettings, EsppTemplates");
                throw new Exception("Нет секции настроек хранилища. MqSettings, EsppTemplates");
            }
            var factory = new ConnectionFactory { HostName = globalSettings.MqSettings.HostName };
            factory.UserName = globalSettings.MqSettings.UserName;
            factory.Password = globalSettings.MqSettings.Password;
            factory.AutomaticRecoveryEnabled = true;
            factory.DispatchConsumersAsync = true;
            connection = factory.CreateConnection();
            channel = connection.CreateModel();
            Dictionary<String, Object> args = new Dictionary<String, Object>();
            args.Add("x-queue-mode", "lazy");

            channel.QueueDeclare(queue: globalSettings.MqSettings.QueueName,
                               durable: true,
                               exclusive: false,
                               autoDelete: false,
                               arguments: args);
        }
        public async Task StartAsync()
        {
            logger.LogInformation($"Запущена проверка очереди {globalSettings.MqSettings!.QueueName}. Интервал: {globalSettings.MqSettings!.CheckIntervalSeconds} секунд.");

            CancellationTokenSource cancelTokenSource = new CancellationTokenSource();
            CancellationToken token = cancelTokenSource.Token;
            Task task = new Task(() => { GetMessages(); }, token);
            task.Start();
            await task.WaitAsync(token);
        }

        private void GetMessages()
        {

            var consumer = new AsyncEventingBasicConsumer(channel);
            consumer.Received += async (ch, ea) =>
            {
                var content = Encoding.UTF8.GetString(ea.Body.ToArray());

                // Обрабатываем полученное сообщение
                await manager.ManageStringAsync(content);
                
                channel.BasicAck(ea.DeliveryTag, false);
                await Task.Yield();
            };

            channel.BasicConsume(globalSettings.MqSettings!.QueueName, false, consumer);

        }



        public void Stop()
        {
            channel.Close();
            connection.Close();
            logger.LogInformation($"=== === === Соединение с очередью {globalSettings.MqSettings!.QueueName} закрыто === === ===");
        }

    }
}