using System;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using xCommons.Extensions;
using xEventService.Configuration;
using xEventService.Constants;
using xEventService.Extensions;
using xEventService.Interfaces;
using xEventService.Providers;
using xExceptions.Constants;

namespace xEventService.DI
{
    public static partial class XDIHelperExtension
    {
        /// <summary>
        /// Extract EventService Configurations ...
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static XEventServiceConfiguration GetXEventServiceConfiguration(
            this IConfiguration source
        )
        {
            //
            var configSection = source
                .GetSection(ConfigurationNodeNames.EVENT_SERVICE_NODE_NAME);
            var result = configSection.Get<XEventServiceConfiguration>();

            //
            return result;
        }

        /// <summary>
        /// Register Event Service Configurations ...
        /// </summary>
        /// <param name="services"></param>
        /// <param name="configuration"></param>
        public static void AddXEventServiceConfiguration(
            this IServiceCollection services,
            IConfiguration configuration
        )
        {
            //
            var config = configuration.GetXEventServiceConfiguration();
            services.AddXEventServiceConfiguration(config);
        }

        /// <summary>
        /// Register Event Service Configurations ...
        /// </summary>
        /// <param name="services"></param>
        /// <param name="configuration"></param>
        public static void AddXEventServiceConfiguration(
            this IServiceCollection services,
            XEventServiceConfiguration configuration
        )
        {
            //
            // Validate ...
            var isValid = configuration.IsValid() &&
                (configuration.Broker == XEventBroker.XKafka ||
                (configuration.Broker == XEventBroker.XZeroMQ &&
                configuration.ZeroMQ.IsValid()) ||
                (configuration.Broker == XEventBroker.XRabbitMQ &&
                configuration.RabbitMQ.IsValid()));
            if (!isValid)
            {
                //
                Log("Registration Failed, due Invalid Configuration ...");
                XException.InvalidConfiguration.Throw();
            }

            //
            // Register Configuration as Singleton ...
            services.AddSingleton(configuration);
        }

        //
        #region Private ...
        /// <summary>
        /// a LogTag for Service ...
        /// </summary>
        private static string XLogTag = XEventServiceConstants.XEventServiceDILogTag;

        /// <summary>
        /// print a log in Console ...
        /// </summary>
        /// <param name="message"></param>
        private static void Log(string message)
        {
            Console.WriteLine($"{XLogTag} => {message}");
        }
        #endregion
    }
}