using AutoMapper;
using DigitalData.Core.Abstractions;
using DigitalData.Core.Abstractions.Application;
using DigitalData.Core.Abstractions.Infrastructure;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;

namespace DigitalData.Core.Application
{
    /// <summary>
    /// Provides extension methods to <see cref="IServiceCollection"/> for registering Clean Architecture CRUD related services and repositories.
    /// </summary>
    public static class DIExtensions
    {
        /// <summary>
        /// Adds a basic CRUD service for a specific DTO and entity type to the service collection.
        /// </summary>
        /// <typeparam name="TDto">The DTO type the service operates on.</typeparam>
        /// <typeparam name="TEntity">The entity type corresponding to the DTO.</typeparam>
        /// <typeparam name="TId">The type of the entity's identifier.</typeparam>
        /// <typeparam name="TProfile">The AutoMapper profile type for configuring mappings between the DTO and the entity.</typeparam>
        /// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
        /// <param name="configureService">An optional action to configure additional services for the CRUD service.</param>
        /// <returns>The original <see cref="IServiceCollection"/> instance, allowing further configuration.</returns>
        public static IServiceCollection AddCleanBasicCRUDService<TCRUDRepository, TDto, TEntity, TId, TProfile>(this IServiceCollection services, Action<IServiceCollection>? configureService = null)
            where TCRUDRepository : ICRUDRepository<TEntity, TId> where TDto : class, IUnique<TId> where TEntity : class, IUnique<TId> where TProfile : Profile
        {
            services.AddScoped<IBasicCRUDService<TDto, TEntity, TId>, BasicCRUDService<TCRUDRepository, TDto, TEntity, TId>>();
            configureService?.Invoke(services);

            services.AddAutoMapper(typeof(TProfile).Assembly);

            return services;
        }

        /// <summary>
        /// Adds a CRUD service for managing create, read, update, and delete operations for a specific set of DTOs and an entity type to the service collection.
        /// </summary>
        /// <typeparam name="TCRUDRepository">The repository type that provides CRUD operations for entities of type TEntity.</typeparam>
        /// <typeparam name="TCreateDto">The DTO type used for create operations.</typeparam>
        /// <typeparam name="TReadDto">The DTO type used for read operations.</typeparam>
        /// <typeparam name="TUpdateDto">The DTO type used for update operations.</typeparam>
        /// <typeparam name="TEntity">The entity type corresponding to the DTOs.</typeparam>
        /// <typeparam name="TId">The type of the entity's identifier.</typeparam>
        /// <typeparam name="TProfile">The AutoMapper profile type for configuring mappings between the DTOs and the entity.</typeparam>
        /// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
        /// <param name="configureService">An optional action to configure additional services for the CRUD service.</param>
        /// <returns>The original <see cref="IServiceCollection"/> instance, allowing further configuration.</returns>
        public static IServiceCollection AddCleanCRUDService<TCRUDRepository, TCreateDto, TReadDto, TUpdateDto, TEntity, TId, TProfile>(this IServiceCollection services, Action<IServiceCollection>? configureService = null)
            where TCRUDRepository : ICRUDRepository<TEntity, TId> where TCreateDto : class where TReadDto : class where TUpdateDto : class, IUnique<TId> where TEntity : class, IUnique<TId> where TProfile : Profile
        {
            services.AddScoped<ICRUDService<TCreateDto, TReadDto, TUpdateDto, TEntity, TId>, CRUDService<TCRUDRepository, TCreateDto, TReadDto, TUpdateDto, TEntity, TId>>();
            configureService?.Invoke(services);

            services.AddAutoMapper(typeof(TProfile).Assembly);

            return services;
        }

        /// <summary>
        /// Adds the directory search service to the <see cref="IServiceCollection"/>.
        /// </summary>
        /// <param name="service">The <see cref="IServiceCollection"/> to add services to.</param>
        /// <param name="directorySearchOptions">
        /// Optional. An instance of <see cref="DirectorySearchOptions"/> to configure the directory search service.
        /// If not provided, the options need to be configured separately.
        /// </param>
        /// <returns>The updated <see cref="IServiceCollection"/>.</returns>
        /// <remarks>
        /// This method adds the necessary services for directory search functionality, including memory caching.
        /// If <paramref name="directorySearchOptions"/> is not provided, ensure to configure the options separately
        /// using the <see cref="IOptions{TOptions}"/> pattern.
        /// </remarks>
        public static IServiceCollection AddDirectorySearchService(this IServiceCollection service, DirectorySearchOptions? directorySearchOptions = null)
        {
            if(directorySearchOptions is not null)
                service.AddSingleton(Options.Create(directorySearchOptions));

            return service
                .AddMemoryCache()
                .AddScoped<IDirectorySearchService, DirectorySearchService>();
        }

        /// <summary>
        /// Adds the JWT service to the <see cref="IServiceCollection"/>.
        /// </summary>
        /// <typeparam name="TClaimValue">The type of the claim value used in the JWT token.</typeparam>
        /// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
        /// <param name="tokenDescriptorFactory">A function that takes a claim value of type <typeparamref name="TClaimValue"/> and returns a <see cref="SecurityTokenDescriptor"/> used to configure the JWT token.</param>
        /// <returns>The original <see cref="IServiceCollection"/> instance, allowing further configuration.</returns>
        /// <remarks>
        /// This method adds the necessary services for handling JWT tokens. The <paramref name="tokenDescriptorFactory"/> function is used to generate the <see cref="SecurityTokenDescriptor"/> which is essential for creating the JWT tokens.
        /// </remarks>
        public static IServiceCollection AddJWTService<TClaimValue>(this IServiceCollection services, Func<TClaimValue, SecurityTokenDescriptor> tokenDescriptorFactory)
        {
            return services.AddScoped<IJWTService<TClaimValue>, JWTService<TClaimValue>>(provider => new (tokenDescriptorFactory));
        }
    }
}