using System;
using Microsoft.Extensions.DependencyInjection;
using xExceptions.Constants;
using xCommons.Extensions;
using xDataService.Constants;
using xDataService.Db;
using xDataService.DI;
using xDataService.Models;
using xStringService.Helpers;
using xCommons.Helpers;
using Microsoft.AspNetCore.Builder;
using xStringService.Interfaces.Dtos;
using xStringService.Providers.Dtos;
using xStringService.Interfaces.Entities;
using xStringService.Providers.Entities;
using xPushService.Helpers;
using xPushService.DI;
using xStringService.Interfaces;
using xStringService.Providers;
using xStringService.Constants;

namespace xStringService.DI
{
    public static class XDIHelperExtension
    {
        /// <summary>
        /// Register Service ...
        /// </summary>
        /// <param name="services"></param>
        /// <param name="repositoryType"></param>
        /// <param name="lifeTime"></param>
        public static void AddXStringService(
            this IServiceCollection services,
            XRepositoryType repositoryType,
            ServiceLifetime lifeTime = ServiceLifetime.Scoped
        )
        {
            AddStringService(
                contextType: null,
                services: services,
                lifeTime: lifeTime,
                repositoryType: repositoryType
            );
        }

        /// <summary>
        /// Register Service ...
        /// </summary>
        /// <typeparam name="TContext"></typeparam>
        /// <param name="services"></param>
        /// <param name="repositoryType"></param>
        /// <param name="lifeTime"></param>
        public static void AddXStringService<TContext>(
            this IServiceCollection services,
            XRepositoryType repositoryType,
            ServiceLifetime lifeTime = ServiceLifetime.Scoped
        )
        where TContext : XDbContext
        {
            AddStringService(
                services: services,
                lifeTime: lifeTime,
                contextType: typeof(TContext),
                repositoryType: repositoryType
            );
        }

        /// <summary>
        /// Use XStringService Middleware ... 
        /// </summary>
        /// <param name="app"></param>
        /// <param name="isDevelopmentEnvironment"></param>
        public static void UseXStringService(
            this IApplicationBuilder app,
            bool isDevelopmentEnvironment = false
        )
        {
            //
            #region  Using XString Hubs ...
            //
            var pushHelper = new XPushServiceHelper();

            //
            pushHelper.AddHub<XStringDtoHub>(XStringServiceConstants.XStringDtoHub);
            pushHelper.AddHub<XStringEntityHub>(XStringServiceConstants.XStringEntityHub);

            //
            app.UseXPushService(pushHelper);
            #endregion

            //
            // Using XString Repository Descriptor ...
            if (!descriptor.IsNull())
            {
                //
                app.UseXRepository(
                    descriptor: descriptor,
                    isDevelopmentEnvironment: isDevelopmentEnvironment
                );
            }
        }

        //
        #region Private ...
        private static XRepositoryDescriptor descriptor = null;

        /// <summary>
        /// a LogTag for Service ...
        /// </summary>
        private static string XLogTag = XStringServiceConstants.XStringServiceDILogTag;

        /// <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="repositoryType"></param>
        /// <param name="contextType"></param>
        /// <param name="lifeTime"></param>
        private static void AddStringService(
            IServiceCollection services,
            XRepositoryType repositoryType,
            Type contextType = null,
            ServiceLifetime lifeTime = ServiceLifetime.Scoped
        )
        {
            //
            var exception = XException.InvalidArgs.ToException(); ;

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

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

            //
            // Validate Repository Type ...
            var isRepositoryTypeValid =
                (repositoryType == XRepositoryType.EF &&
                !contextType.IsNull()) ||
                ((repositoryType == XRepositoryType.Mongo || 
                    repositoryType == XRepositoryType.InMemory) &&
                contextType.IsNull());
            if (!isRepositoryTypeValid)
            {
                //
                Log("Service Registration failed, Invalid Repository Type and Context Type ...");
                throw exception;                
            }

            //
            // Maske Instance of Repository Descriptor 
            // Based on Provided Type ...
            switch(repositoryType)
            {
                //
                case XRepositoryType.EF:
                //
                descriptor = typeof(XStringServiceHelper)
                    .InvokeGenericMethod<XRepositoryDescriptor>(
                        args: null,
                        runtimeType: contextType,
                        methodName: XStringServiceConstants.GetXStringEFRepositoryDescriptor
                );
                break;

                //
                case XRepositoryType.Mongo:
                descriptor = XStringServiceHelper.GetXStringMongoRepositoryDescriptor();
                break;

                //
                case XRepositoryType.InMemory:
                descriptor = XStringServiceHelper.GetXStringInMemoryRepositoryDescriptor();
                break;
            }

            //
            // Register XString Repository Descriptor ...
            services.AddXRepository(
                lifeTime: lifeTime,
                descriptor: descriptor
            );

            //
            // Register Dto Services ...
            services.Add(
                new ServiceDescriptor(typeof(IXStringServiceProvider), typeof(XStringServiceProvider), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXStringRepositoryService), typeof(XStringRepositoryService), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXStringRepositoryProvider), typeof(XStringRepositoryProvider), lifeTime)
            );

            //
            // Register XString Provider ...
            services.Add(
                new ServiceDescriptor(typeof(IXStringProvider), typeof(XStringProvider), lifeTime)
            );

            //
            Log("Service Regitration Succeed ...");
        }
        #endregion
    }
}