using System;
using Microsoft.Extensions.DependencyInjection;
using xCommons.Extensions;
using xExceptions.Constants;
using xWebinarService.Interfaces;
using xWebinarService.Interfaces.Entities;
using xWebinarService.Providers;

namespace xWebinarService.DI {
    public static class XDIHelperExtension
    {
        /// <summary>
        /// Register Module Provided Service on DI
        /// </summary>
        /// <param name="services"></param>
        /// <param name="config"></param>
        public static void AddXWebinarService(
            this IServiceCollection services,
            ServiceLifetime lifeTime
        )
        {
            //
            AddWebinarService(
                services,
                lifeTime
            );
        }

        //
        #region Private ...
        /// <summary>
        /// a LogTag for XWebinarService ...
        /// </summary>
        private static string XLogTag = "XWebinarService";

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

        /// <summary>
        /// Register Push Service ...
        /// </summary>
        /// <param name="services"></param>
        /// <param name="lifeTime"></param>
        private static void AddWebinarService(
            IServiceCollection services,
            ServiceLifetime lifeTime
        )
        {
            //
            var exception = XException.InvalidArgs.ToException(); ;

            //
            // Services ...
            var isServicesExists = !services.IsNull();
            if (!isServicesExists)
            {
                //
                Log("AddWebinarService failed, services not provided ...");
                throw exception;
            }

            //
            // Lifetime ...
            var isLifetimeExists = !lifeTime.IsNull();
            if (!isLifetimeExists)
            {
                //
                Log("AddWebinarService failed, lifetime not provided ...");
                throw exception;
            }

            //
            // Check String Repository Exists ...
            var isWebinarRepositoryExists = !services
                .GetRegisteredService<IXWebinarRepository>()
                .IsNull() &&
                !services.GetRegisteredService<IXWebinarSubscriberRepository>()
                .IsNull();
            if (!isWebinarRepositoryExists)
            {
                //
                Log("AddWebinarService failed, IXWebinarRepository or IXWebinarSubscriberRepository not provided ...");
                throw exception;
            }

            //
            // Register Resource Providers ...
            services.Add(new ServiceDescriptor(typeof(IXWebinarTitleResourceProvider), typeof(XWebinarTitleResourceProvider), lifeTime));
            services.Add(new ServiceDescriptor(typeof(IXWebinarDescriptionResourceProvider), typeof(XWebinarDescriptionResourceProvider), lifeTime));

            //
            // Register Main Provider ...
            services.Add(new ServiceDescriptor(typeof(IXWebinarProvider), typeof(XWebinarProvider), lifeTime));
            
            //
            Log("AddWebinarService Succeed ...");
        }
        #endregion
        
    }
}