using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using xAiModels.Providers.Entities;
using xDataService.Constants;
using xDataService.Db;
using xPushService.Helpers;

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

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

            //
            // XAiConversation ...
            pushHelper.AddHub<XAiConversationEntityHub>("categoryDto");
            pushHelper.AddHub<XAiDataServiceEntityHub>("categoryEntity");

            //
            // SubCategory ...
            pushHelper.AddHub<XSubCategoryDtoHub>("subCategoryDto");
            pushHelper.AddHub<XSubCategoryEntityHub>("subCategoryEntity");

            //
            app.UseXPushService(pushHelper);
            #endregion

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

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

            //
            // Create an Scope for Services Acces ...
            // Handle Seeding Category/SubCategory Resources ...
            using (var scope = app.ApplicationServices.CreateScope())
            {
                //
                // Retrieve Configuratuions ...
                var categoryProvider = scope.ServiceProvider.GetService<IXAiDataServiceProvider>();
                var subCategoryProvider = scope.ServiceProvider.GetService<IXSubCategoryProvider>();
                var configuration = scope.ServiceProvider.GetService<XAiDataServiceServiceConfiguration>();
                if (!configuration.IsNullOrDefault() &&
                    !categoryProvider.IsNullOrDefault() &&
                    !subCategoryDescriptor.IsNullOrDefault()
                )
                {
                    //
                    // Logging ...
                    Log("Start Seeding ...");

                    //
                    // Count Data in Category ...
                    var hasCategory = (categoryProvider.Count().GetAwaiter().GetResult()) > 0;
                    var hasSubCategory = (subCategoryProvider.Count().GetAwaiter().GetResult()) > 0;

                    //
                    // Seed Category Resources ...
                    var canSeed =
                        !hasCategory &&
                        configuration.Categories.HasChild();
                    if (canSeed)
                    {
                        //
                        // Loop through Provided items ...
                        foreach (var cat in configuration.Categories)
                        {
                            //
                            try
                            {
                                //
                                Log($"Start Seeding Category: {cat.Titles.Locales.ToArray()[0].Value} ...");

                                //
                                categoryProvider.Refresh(
                                    resource: cat,
                                    userInfo: null,
                                    connectionId: null,
                                    cancellationToken: default
                                )
                                .GetAwaiter()
                                .GetResult();

                                //
                                Log($"Seeding Category: {cat.Titles.Locales.ToArray()[0].Value} Finished Successfully ...");
                            }
                            catch (Exception ex)
                            {
                                Log($"Seeding Category: {cat.Titles.Locales.ToArray()[0].Value} Failed due: {ex.Message} ...");
                            }
                        }
                    }

                    //
                    // Seed SubCategory Resources ...
                    canSeed =
                        !hasSubCategory &&
                        configuration.SubCategories.HasChild();
                    if (canSeed)
                    {
                        //
                        // Loop through Provided items ...
                        foreach (var subcat in configuration.SubCategories)
                        {
                            //
                            try
                            {
                                //
                                Log($"Start Seeding SubCategory: {subcat.Titles.Locales.ToArray()[0].Value} ...");

                                //
                                subCategoryProvider.Refresh(
                                    userInfo: null,
                                    resource: subcat,
                                    connectionId: null,
                                    cancellationToken: default
                                )
                                .GetAwaiter()
                                .GetResult();

                                //
                                Log($"Seeding SubCategory: {subcat.Titles.Locales.ToArray()[0].Value} Finished Successfully ...");
                            }
                            catch (Exception ex)
                            {
                                Log($"Seeding SubCategory: {subcat.Titles.Locales.ToArray()[0].Value} Failed due: {ex.Message} ...");
                            }
                        }
                    }

                    //
                    Log("Finish Seeding ...");
                }
            }
        }

        //
        #region Private ...
        private static XRepositoryDescriptor categoryDescriptor = null;
        private static XRepositoryDescriptor subCategoryDescriptor = null;

        /// <summary>
        /// a LogTag for Service ...
        /// </summary>
        private static string XLogTag = "XAiDataServiceService";

        /// <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 AddCategoryService(
            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:
                    //
                    // Category ...
                    categoryDescriptor = typeof(XAiDataServiceServiceHelper)
                        .InvokeGenericMethod<XRepositoryDescriptor>(
                            methodName: "GetXAiDataServiceEFRepositoryDescriptor",
                            runtimeType: contextType,
                            args: null
                    );

                    //
                    // SubCategory ...
                    subCategoryDescriptor = typeof(XAiDataServiceServiceHelper)
                        .InvokeGenericMethod<XRepositoryDescriptor>(
                            methodName: "GetXSubCategoryEFRepositoryDescriptor",
                            runtimeType: contextType,
                            args: null
                    );
                    break;

                //
                case XRepositoryType.Mongo:
                    //
                    // Category ...
                    categoryDescriptor = XAiDataServiceServiceHelper.GetXAiDataServiceMongoRepositoryDescriptor();

                    //
                    // SubCategory ...
                    subCategoryDescriptor = XAiDataServiceServiceHelper.GetXSubCategoryMongoRepositoryDescriptor();
                    break;

                //
                case XRepositoryType.InMemory:
                    //
                    // Category ...
                    categoryDescriptor = XAiDataServiceServiceHelper.GetXAiDataServiceInMemoryRepositoryDescriptor();

                    //
                    // SubCategory ...
                    subCategoryDescriptor = XAiDataServiceServiceHelper.GetXSubCategoryInMemoryRepositoryDescriptor();
                    break;
            }

            //
            // Register Category Repository Descriptor ...
            if (!categoryDescriptor.IsNull())
            {
                //
                services.AddXRepository(
                    lifeTime: lifeTime,
                    descriptor: categoryDescriptor
                );
            }

            //
            // Register SubCategory Repository Descriptor ...
            if (!subCategoryDescriptor.IsNull())
            {
                //
                services.AddXRepository(
                    lifeTime: lifeTime,
                    descriptor: subCategoryDescriptor
                );
            }

            //
            #region Register Services ...            
            //
            #region Category ...
            //
            // Models ...
            services.Add(
                new ServiceDescriptor(typeof(IXAiDataServiceServiceProvider), typeof(XAiDataServiceServiceProvider), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXAiDataServiceRepositoryService), typeof(XAiDataServiceRepositoryService), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXAiDataServiceRepositoryProvider), typeof(XAiDataServiceRepositoryProvider), lifeTime)
            );

            //
            // Resource Providers ...
            services.Add(
                new ServiceDescriptor(typeof(IXAiDataServiceTitleResourceProvider), typeof(XAiDataServiceTitleResourceProvider), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXAiDataServiceDescriptionResourceProvider), typeof(XAiDataServiceDescriptionResourceProvider), lifeTime)
            );

            //
            // Reference Providers ...
            services.Add(
                new ServiceDescriptor(typeof(IXAiDataServiceSubCategoryReferenceProvider), typeof(XAiDataServiceSubCategoryReferenceProvider), lifeTime)
            );

            //
            // Provider ...
            services.Add(
                new ServiceDescriptor(typeof(IXAiDataServiceProvider), typeof(XAiDataServiceProvider), lifeTime)
            );
            #endregion

            //
            #region SubCategory ...
            //
            // Models ...
            services.Add(
                new ServiceDescriptor(typeof(IXSubCategoryServiceProvider), typeof(XSubCategoryServiceProvider), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXSubCategoryRepositoryService), typeof(XSubCategoryRepositoryService), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXSubCategoryRepositoryProvider), typeof(XSubCategoryRepositoryProvider), lifeTime)
            );

            //
            // Resource Providers ...
            services.Add(
                new ServiceDescriptor(typeof(IXSubCategoryTitleResourceProvider), typeof(XSubCategoryTitleResourceProvider), lifeTime)
            );
            services.Add(
                new ServiceDescriptor(typeof(IXSubCategoryDescriptionResourceProvider), typeof(XSubCategoryDescriptionResourceProvider), lifeTime)
            );

            //
            // Provider ...
            services.Add(
                new ServiceDescriptor(typeof(IXSubCategoryProvider), typeof(XSubCategoryProvider), lifeTime)
            );
            #endregion
            #endregion

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