using gehGassi.Core.Interfaces;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using gehGassi.Domain.Common;
using gehGassi.Domain.Dogs;
using gehGassi.Domain.Subscriptions;
using Microsoft.EntityFrameworkCore;

namespace gehGassi.Core.Services
{
    /// <summary>
    /// Service für Abonnements
    /// </summary>
    public class SubscriptionService : ServiceBase<Subscription>, ISubscriptionService
    {
        private readonly IRepository<SubscriptionWithNames> _namesRepository;
        private readonly IRepository<AppUserSubscription> _appUserSubscriptionRepository;
        private readonly IRepository<AppUserSubscriptionWithNames> _appUserSubscriptionNamesRepository;

        /// <summary>
        /// Erstellt eine neue Instanz
        /// </summary>
        /// <param name="unitOfWork">Instanz eines IUnitOfWork</param>
        public SubscriptionService(IUnitOfWork unitOfWork) : base(unitOfWork)
        {
            _namesRepository = unitOfWork.GetRepository<SubscriptionWithNames>();
            _appUserSubscriptionRepository = unitOfWork.GetRepository<AppUserSubscription>();
            _appUserSubscriptionNamesRepository = unitOfWork.GetRepository<AppUserSubscriptionWithNames>();
        }

        /// <summary>
        /// Gibt eine gefilterte Liste von Abonnements zurück
        /// </summary>
        /// <param name="filter">Filterbegriff der in bestimmten Feldern gesucht wird</param>
        /// <returns>List betroffener Abonnements</returns>
        public IQueryable<Subscription> Filter(string filter)
        {
            return Repository.Query(c => c.Name.Contains(filter) || c.NameLocalized.Contains(filter));
        }

        /// <summary>
        /// Erstellen eines Abonnements
        /// </summary>
        /// <returns>Abonnement</returns>
        public Subscription Create()
        {
            var item = new Subscription()
            {
                Id = Guid.NewGuid().ToString("N"),
            };
            return item;
        }

        /// <summary>
        /// Gibt eine gefilterte Liste von Abonnements zurück.
        /// </summary>
        /// <param name="filter">Filterbegriff der in bestimmten Feldern gesucht wird</param>
        /// <returns>List betroffener Abonnements</returns>
        public async Task<List<Subscription>> SearchAsync(string filter)
        {
            return (await Repository.FindAsync(c => c.NameLocalized.Contains(filter) && c.Deleted == false)).ToList();
        }

        /// <summary>
        /// Gibt eine gefilterte Liste von Abonnements mit Namen zurück in einer gewählten Sprache
        /// </summary>
        /// <param name="filter">Filterbegriff der in bestimmten Feldern gesucht wird</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <param name="includeDeleted">Sollen gelöschte inkludiert werden?</param>
        /// <returns>Liste betroffener Abonnements</returns>
        public IQueryable<SubscriptionWithNames> FilterWithNames(string filter, string language, string fallback, bool includeDeleted)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _namesRepository.QueryStoredProcedure("SELECT * FROM tv_SubscriptionsWithNames({0},{1})", c => c.Name.Contains(filter) || c.Description.Contains(filter), language, fallback);

            if (!includeDeleted)
                baseQuery = baseQuery.Where(c => c.Deleted == false);

            return baseQuery;
        }

        /// <summary>
        /// Gibt eine Liste von Abonnements zurück, welche dem gesuchten AppMode entsprechend und aktiv sind
        /// </summary>
        /// <param name="appMode">Gesuchter App mode</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <returns>Liste Abonnements</returns>
        public async Task<List<SubscriptionWithNames>> GetAllAsync(AppMode appMode, string language, string fallback)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _namesRepository.QueryStoredProcedure("SELECT * FROM tv_SubscriptionsWithNames({0},{1})", c => c.AppMode == appMode && c.Enabled && c.Deleted == false, language, fallback);
            var list = await baseQuery.ToListAsync();

            return list;
        }

        /// <summary>
        /// Gibt eine gefilterte Liste von Abonnements mit Namen zurück in einer gewählten Sprache
        /// </summary>
        /// <param name="filter">Filterbegriff der in bestimmten Feldern gesucht wird</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <returns>Liste betroffener Abonnements</returns>
        public IQueryable<AppUserSubscriptionWithNames> FilterAppUserSubscritionsWithNames(string filter, string language, string fallback)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _appUserSubscriptionNamesRepository.QueryStoredProcedure("SELECT * FROM tv_AppUserSubscriptionsWithNames({0},{1})", c => c.AppUserName.Contains(filter), language, fallback);

            return baseQuery;
        }

        /// <summary>
        /// Gibt eine Liste von Abonnements zurück, welche ein App-User abonniert hat
        /// </summary>
        /// <param name="appUserId">App user id</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <returns>Liste betroffener Abonnement-Buchungen</returns>
        public async Task<List<AppUserSubscriptionWithNames>> GetAllAppUserSubscriptionsAsync(string appUserId, string language, string fallback)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _appUserSubscriptionNamesRepository.QueryStoredProcedure("SELECT * FROM tv_AppUserSubscriptionsWithNames({0},{1})", c => c.AppUserId == appUserId, language, fallback);
            return await baseQuery.ToListAsync();
        }

        /// <summary>
        /// Gibt eine Liste von Abonnements zurück, welche ein App-User abonniert hat die gültig und aktiv sind
        /// </summary>
        /// <param name="appUserId">App user id</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <returns>Liste betroffener Abonnement-Buchungen</returns>
        public async Task<List<AppUserSubscriptionWithNames>> GetAllAppUserSubscriptionsValidAsync(string appUserId, string language, string fallback)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _appUserSubscriptionNamesRepository.QueryStoredProcedure("SELECT * FROM tv_AppUserSubscriptionsWithNames({0},{1})", c => c.AppUserId == appUserId && c.IsValid, language, fallback);
            return await baseQuery.ToListAsync();
        }

        /// <summary>
        /// Gibt eine Abonnementbuchung mit Namen zurück
        /// </summary>
        /// <param name="id">Id der Buchung</param>
        /// <param name="language"></param>
        /// <param name="fallback"></param>
        /// <returns>AppUserSubscriptionWithNames</returns>
        public async Task<AppUserSubscriptionWithNames> GetAppUserSubscriptionAsync(long id, string language, string fallback)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _appUserSubscriptionNamesRepository.QueryStoredProcedure("SELECT * FROM tv_AppUserSubscriptionsWithNames({0},{1})", c => c.Id == id, language, fallback);
            return await baseQuery.FirstOrDefaultAsync();
        }

        /// <summary>
        /// Erstellen eines Abonnements für einen App-User
        /// </summary>
        /// <returns>Abonnement</returns>
        public AppUserSubscription CreateAppUserSubscription()
        {
            var item = new AppUserSubscription()
            {
                
            };
            return item;
        }

        /// <summary>
        /// Gibt ein App-User-Abonnement zurück
        /// </summary>
        /// <param name="id">AppUserSubcription  id</param>
        /// <returns>AppUserSubscription</returns>
        public async Task<AppUserSubscription> GetAppUserSubscriptionAsync(long id)
        {
            return await _appUserSubscriptionRepository.GetAsync(id);
        }

        /// <summary>
        /// Gibt ein App-User-Abonnement zurück
        /// </summary>
        /// <param name="appUserId">App user id</param>
        /// <param name="subscriptionId">Abo-Id</param>
        /// <returns>AppUserSubscription oder null, wenn nicht gefunden</returns>
        public async Task<AppUserSubscription> GetAppUserSubscriptionAsync(string appUserId, string subscriptionId)
        {
            return await _appUserSubscriptionRepository.FirstOrDefaultAsync(c => c.AppUserId == appUserId && c.SubscriptionId == subscriptionId);
        }

        /// <summary>
        /// Fügt eine Entität zum Repository hinzu
        /// </summary>
        /// <param name="entity">Entität</param>
        public void AddAppUserSubscription(AppUserSubscription entity)
        {
            _appUserSubscriptionRepository.Add(entity);
        }

        /// <summary>
        /// Entfernt eine Entität aus dem Repository
        /// </summary>
        /// <param name="entity">Zu entfernende Entität</param>
        public void RemoveAppUserSubscription(AppUserSubscription entity)
        {
            _appUserSubscriptionRepository.Remove(entity);
        }

        /// <summary>
        /// Prüft ob ein App-User ein Abonnement hat für einen AppMode das noch gültig ist
        /// </summary>
        /// <param name="appUserId">App user id</param>
        /// <param name="appMode">AppMode</param>
        /// <returns>true wenn ja, false else</returns>
        public async Task<bool> AppUserHasActiveBookingAsync(string appUserId, AppMode appMode)
        {
            var baseQuery = _appUserSubscriptionNamesRepository.QueryStoredProcedure("SELECT * FROM tv_AppUserSubscriptionsWithNames({0},{1})", c => c.AppUserId == appUserId && c.SubscriptionAppMode == appMode && c.IsValid, "DE", "DE");
            var items = await baseQuery.CountAsync();
            return items != 0;
        }

        /// <summary>
        /// Setzt Abo-Buchungen die abgelaufen sind auf ungültig
        /// </summary>
        /// <returns></returns>
        public async Task<int> InvalidateExipredAppUserSubscriptionsAsync(DateTimeOffset date)
        {
            var items = await _appUserSubscriptionRepository.FindAsync(c => c.IsValid && c.ExpirationDateWithGrace <= date);
            foreach (var item in items)
            {
                item.IsValid = false;
            }
            return items.Count();
        }
    }
}