using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using RabbitMQ.Client;
using xCommons.Extensions;
using xEventService.Configuration;
using xEventService.Extensions;
using xExceptions.Constants;

namespace xEventService.Providers
{
    /// <summary>
    /// an Abstract Kafka Consumer Service ...
    /// </summary>
    public class XRabbitMQConsumerServiceBase : BackgroundService
    {
        protected readonly IModel channel;
        protected readonly IConnection connection;
        protected readonly XEventServiceConfiguration configuration;
        protected readonly ILogger<XRabbitMQConsumerServiceBase> logger;

        public XRabbitMQConsumerServiceBase(
            XEventServiceConfiguration configuration,
            ILogger<XRabbitMQConsumerServiceBase> logger
        )
        {
            //
            this.logger = logger;
            this.configuration = configuration;

            //
            // Validate ...
            if (!configuration.IsValid() ||
                !configuration.RabbitMQ.IsValid() ||
                configuration.Broker != Constants.XEventBroker.XRabbitMQ
            )
            {
                XException.InvalidConfiguration.Throw();
            }
        }
    
        public abstract Task HandleMessageAsync(
            XEventMessage message,
            CancellationToken cancellationToken = default
        );    
    }
}