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

namespace xFileService.DI
{
    public static class XDIHelperExtension
    {
        /// <summary>
        /// Register Service ...
        /// </summary>
        /// <param name="services"></param>
        /// <param name="repositoryType"></param>
        /// <param name="lifeTime"></param>
        public static void AddXFileService(
            this IServiceCollection services,
            XRepositoryType repositoryType,
            ServiceLifetime lifeTime = ServiceLifetime.Scoped
        )
        {
            AddFileService(
                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 AddXFileService<TContext>(
            this IServiceCollection services,
            XRepositoryType repositoryType,
            ServiceLifetime lifeTime = ServiceLifetime.Scoped
        )
        where TContext : XDbContext
        {
            AddFileService(
                services: services,
                lifeTime: lifeTime,
                contextType: typeof(TContext),
                repositoryType: repositoryType
            );
        }

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

            //
            pushHelper.AddHub<XFileDtoHub>(XFileServiceConstants.XFileDtoHub);
            pushHelper.AddHub<XFileEntityHub>(XFileServiceConstants.XFileEntityHub);

            //
            app.UseXPushService(pushHelper);
            #endregion

            //
            // Using XFile 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 = XFileServiceConstants.XFileServiceDILogTag;

        /// <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 AddFileService(
            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(XFileServiceHelper)
                        .InvokeGenericMethod<XRepositoryDescriptor>(
                            args: null,
                            runtimeType: contextType,
                            methodName: XFileServiceConstants.GetXFileEFRepositoryDescriptor
                    );
                    break;

                //
                case XRepositoryType.Mongo:
                    descriptor = XFileServiceHelper.GetXFileMongoRepositoryDescriptor();
                    break;

                //
                case XRepositoryType.InMemory:
                    descriptor = XFileServiceHelper.GetXFileInMemoryRepositoryDescriptor();
                    break;
            }

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

            //
            // Register Dto Services ...
            services.Add(
                new ServiceDescriptor(typeof(IXFileServiceProvider), typeof(XFileServiceProvider), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXFileRepositoryService), typeof(XFileRepositoryService), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXFileRepositoryProvider), typeof(XFileRepositoryProvider), lifeTime)
            );

            //
            // Register Additional Service ...
            services.Add(
                new ServiceDescriptor(typeof(IXFileTagProvider), typeof(XFileTagProvider), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXFileTagProvided), typeof(XFileTagProvided), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXFileProvider), typeof(XFileProvider), lifeTime)
            );

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