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

namespace xFileService.DI
{
    public static class XDIHelperExtension
    {
        /// <summary>
        /// Register Service ...
        /// </summary>
        /// <param name="services"></param>
        /// <param name="config"></param>
        public static void AddXFileService(
            this IServiceCollection services,
            ServiceLifetime lifeTime
        )
        {
            //
            AddFileService(
                services,
                lifeTime
            );
        }

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

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

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

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

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

            //
            // Check Dependencies Exists ...
            var isDependenciesPassed = !services
                .GetRegisteredService<IXStorageProvider>()
                .IsNull();
            if (!isDependenciesPassed)
            {
                //
                Log("AddFileService failed due Dependencies Issues, IXStorageProvider not provided ...");
                throw exception;
            }

            //
            // Check Repository Exists ...
            var isRepositoryExists = !services
                .GetRegisteredService<IXFileRepository>()
                .IsNull();
            if (!isRepositoryExists)
            {
                //
                Log("AddFileService failed, IXFileRepository not provided ...");
                throw exception;
            }

            //
            // Register Main Provider ...
            services.Add(new ServiceDescriptor(typeof(IXFileProvider), typeof(XFileProvider), lifeTime));

            //
            Log("AddFileService Succeed ...");
        }
        #endregion                
    }
}