using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using gehGassi.Core.Interfaces;
using gehGassi.Domain.Advertisements;
using gehGassi.Domain.Common;
using gehGassi.Domain.News;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using NetTopologySuite.Geometries;
using NetTopologySuite;

namespace gehGassi.Core.Services
{
    /// <summary>
    /// Service für die Verwaltung von Listungen
    /// </summary>
    public class ListingService : ServiceBase<Listing>, IListingService
    {
        private readonly IOptions<ListingOptions> _listingOptions;
        private readonly IRepository<ListingWithNames> _namesRepository;

        /// <summary>
        /// Erstellt eine Instanz
        /// </summary>
        /// <param name="unitOfWork">Instanz einer IUnitOfWork</param>
        /// <param name="listingOptions">Instanz von ListingOptions</param>
        public ListingService(IUnitOfWork unitOfWork, IOptions<ListingOptions> listingOptions) : base(unitOfWork)
        {
            _listingOptions = listingOptions;
            _namesRepository = unitOfWork.GetRepository<ListingWithNames>();
        }

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

        /// <summary>
        /// Erstellen einer Listung
        /// </summary>
        /// <returns>Listung</returns>
        public Listing Create()
        {
            var item = new Listing()
            {
                Id = Guid.NewGuid().ToString("N"),
                Created = DateTimeOffset.UtcNow
            };
            return item;
        }

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

        /// <summary>
        /// Gibt eine gefilterte Liste von Listings 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>
        /// <param name="excludeDraft">Sollen Entitäten im Draft-Status (Cart) ausgeblendet werden?</param>
        /// <returns>Liste betroffener Listings</returns>
        public IQueryable<ListingWithNames> FilterWithNames(string filter, string language, string fallback, bool includeDeleted, bool excludeDraft)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

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

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

            if (excludeDraft)
                baseQuery = baseQuery.Where(c => c.Status != ListingStatus.Draft);

            return baseQuery;
        }

        /// <summary>
        /// Gibt eine gefilterte Liste von Listings mit Namen für Kunden zurück in einer gewählten Sprache
        /// </summary>
        /// <param name="customerId">Id des Kunden</param>
        /// <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>
        /// <param name="excludeDraft">Sollen Entitäten im Draft-Status (Cart) ausgeblendet werden?</param>
        /// <returns>Liste betroffener Listings</returns>
        public IQueryable<ListingWithNames> FilterWithNamesCustomer(long customerId, string filter, string language, string fallback, bool includeDeleted, bool excludeDraft)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _namesRepository.QueryStoredProcedure("SELECT * FROM tv_ListingsWithNames({0},{1})", c => c.CustomerId == customerId && (c.Name.Contains(filter) || c.CustomerName.Contains(filter)), language, fallback);

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

            if (excludeDraft)
                baseQuery = baseQuery.Where(c => c.Status != ListingStatus.Draft);

            return baseQuery;
        }

        /// <summary>
        /// Löschen von Listungen basierend auf einer Branche
        /// </summary>
        /// <param name="branchId">Id der Branche</param>
        /// <param name="forceDelete">Wenn true, dann wirklich löschen, auf gelöscht setzen sonst</param>
        /// <returns>Task</returns>
        public async Task DeleteByBranchAsync(string branchId, bool forceDelete)
        {
            var items = await Repository.FindAsync(c => c.BranchId == branchId).ConfigureAwait(false);
            foreach (var listing in items)
            {
                if(!forceDelete)
                    listing.Deleted = true;
                else
                    Repository.Remove(listing);
            }
        }

        /// <summary>
        /// Prüfen der Verfügbarkeit einer Listung für eine Buchung
        /// </summary>
        /// <param name="customerId">Id des Kunden</param>
        /// <param name="branchId">Id der Branche</param>
        /// <param name="listingType">Listungs-Typ</param>
        /// <param name="startDate">Startdatum</param>
        /// <param name="endDate">Enddatum</param>
        /// <param name="countryIso">ISO2 des Landes</param>
        /// <param name="ignoreId">Id die ignoriert werden soll</param>
        /// <returns>ListingValidationResult</returns>
        public async Task<ListingValidationResult> IsAvailableAsync(long customerId, string branchId, ListingType listingType, DateTimeOffset startDate, DateTimeOffset endDate, string countryIso, string ignoreId)
        {
            var result = new ListingValidationResult()
            {
                Valid = true,
                Booked = 0,
                Reserved = 0,
                ErrorCode = ListingValidationError.None
            };

            //anpassung --> alle Listungstypen berücksichtigen. Es darf nur eine Listung je Kunde je Land und Branche geben. Der Listungstyp ist dabei egal.
            //var customerCount = await Repository.CountAsync(c => c.Id != ignoreId && c.Deleted == false && c.BranchId == branchId && c.ListingType == listingType && c.CustomerId == customerId && c.Address.CountryCode == countryIso && (c.Status == ListingStatus.ToPay || c.Status == ListingStatus.Booked || c.Status == ListingStatus.Running) && ((startDate >= c.StartDate && startDate <= c.EndDate) || (endDate >= c.StartDate && endDate <= c.EndDate)));
            var customerCount = await Repository.CountAsync(c => c.Id != ignoreId && c.Deleted == false && c.BranchId == branchId && c.CustomerId == customerId && c.Address.CountryCode == countryIso && (c.Status == ListingStatus.ToPay || c.Status == ListingStatus.Booked || c.Status == ListingStatus.Running) && ((startDate >= c.StartDate && startDate <= c.EndDate) || (endDate >= c.StartDate && endDate <= c.EndDate)));
            var bookedCount = await Repository.CountAsync(c => c.Id != ignoreId && c.Deleted == false && c.BranchId == branchId && c.ListingType == listingType && c.CustomerId != customerId && c.Address.CountryCode == countryIso && (c.Status == ListingStatus.ToPay || c.Status == ListingStatus.Booked || c.Status == ListingStatus.Running) && ((startDate >= c.StartDate && startDate <= c.EndDate) || (endDate >= c.StartDate && endDate <= c.EndDate)));
            var reservedCount = await Repository.CountAsync(c => c.Id != ignoreId && c.Deleted == false && c.BranchId == branchId && c.ListingType == listingType && c.CustomerId != customerId && c.Address.CountryCode == countryIso && c.ReservedUntil != null);

            result.Booked = bookedCount;
            result.Reserved = reservedCount;
            var total = bookedCount + reservedCount;

            if (customerCount > 0)
            {
                result.ErrorCode = ListingValidationError.AlreadyBooked;
                result.Valid = false;
            }
            else
            {
                switch (listingType)
                {
                    case ListingType.Base:
                        if (total >= _listingOptions.Value.Base)
                        {
                            result.ErrorCode = ListingValidationError.NoSlotsAvailable;
                            result.Valid = false;
                        }
                        break;
                    case ListingType.Silver:
                        if (total >= _listingOptions.Value.Silver)
                        {
                            result.ErrorCode = ListingValidationError.NoSlotsAvailable;
                            result.Valid = false;
                        }
                        break;
                    case ListingType.Gold:
                        if (total >= _listingOptions.Value.Gold)
                        {
                            result.ErrorCode = ListingValidationError.NoSlotsAvailable;
                            result.Valid = false;
                        }
                        break;
                    case ListingType.Platin:
                        if (total >= _listingOptions.Value.Platin)
                        {
                            result.ErrorCode = ListingValidationError.NoSlotsAvailable;
                            result.Valid = false;
                        }
                        break;
                    default:
                        throw new ArgumentOutOfRangeException(nameof(listingType), listingType, null);
                }
            }

            return result;
        }

        /// <summary>
        /// Gibt die Anzahl von Listungen zurück
        /// </summary>
        /// <param name="includeDeleted">Sollen gelöschte inkludiert werden?</param>
        /// <param name="excludeDraft">Sollen Entitäten im Draft-Status (Cart) ausgeblendet werden?</param>
        /// <returns>Anzahl Listungen</returns>
        public async Task<int> CountAsync(bool includeDeleted, bool excludeDraft)
        {
            var query = Repository.Query(c => c.Id != "");
            if (!includeDeleted)
                query = query.Where(c => c.Deleted == false);
            if(excludeDraft)
                query = query.Where(c => c.Status != ListingStatus.Draft);
            return await query.CountAsync().ConfigureAwait(false);
        }

        /// <summary>
        /// Gibt die Anzahl von Listungen in einem Status zurück
        /// </summary>
        /// <param name="status">Gesuchter Status</param>
        /// <param name="includeDeleted">Sollen gelöschte inkludiert werden?</param>
        /// <returns>Anzahl Listungen</returns>
        public async Task<int> CountAsync(ListingStatus status, bool includeDeleted)
        {
            var query = Repository.Query(c => c.Status == status);
            if (!includeDeleted)
                query = query.Where(c => c.Deleted == false);
            return await query.CountAsync().ConfigureAwait(false);
        }

        /// <summary>
        /// Prüft ob sich eine Listung bereits im Warenkorb befindet.
        /// Listungen mit bestimmten Parametern dürfen nur einmal vorkommen
        /// </summary>
        /// <param name="cartId">Id des Warenkorb</param>
        /// <param name="customerId">Id des Kunden</param>
        /// <param name="branchId">Id der Branche</param>
        /// <param name="listingType">Listungs-Typ</param>
        /// <param name="startDate">Startdatum</param>
        /// <param name="endDate">Enddatum</param>
        /// <param name="countryIso">ISO2 des Landes</param>
        /// <param name="ignoreId">Id die ignoriert werden soll</param>
        /// <returns>True wenn die Listung gefunden wurde, false sonst</returns>
        public async Task<bool> CheckListingInCartAsync(long cartId, long customerId, string branchId, ListingType listingType, DateTimeOffset startDate, DateTimeOffset endDate, string countryIso, string ignoreId)
        {
            //anpassung --> alle Listungstypen berücksichtigen. Es darf nur eine Listung je Kunde je Land und Branche geben. Der Listungstyp ist dabei egal.
            //var count = await Repository.CountAsync(c => c.Id != ignoreId && c.Deleted == false && c.CartId == cartId && c.BranchId == branchId && c.ListingType == listingType && c.CustomerId == customerId && c.Address.CountryCode == countryIso && c.Status == ListingStatus.Draft && ((startDate >= c.StartDate && startDate <= c.EndDate) || (endDate >= c.StartDate && endDate <= c.EndDate)));
            var count = await Repository.CountAsync(c => c.Id != ignoreId && c.Deleted == false && c.CartId == cartId && c.BranchId == branchId && c.CustomerId == customerId && c.Address.CountryCode == countryIso && c.Status == ListingStatus.Draft && ((startDate >= c.StartDate && startDate <= c.EndDate) || (endDate >= c.StartDate && endDate <= c.EndDate)));
            return count != 0;
        }

        /// <summary>
        /// Gibt eine Listung für einen Artikel im Warenkorb zurück
        /// </summary>
        /// <param name="cartItemId">Id des Artikels im Warenkorb</param>
        /// <returns>Listing oder null, wenn nicht gefunden</returns>
        public async Task<Listing> GetByCartItemAsync(long cartItemId)
        {
            return await Repository.FirstOrDefaultAsync(c => c.CartItemId == cartItemId && c.Status == ListingStatus.Draft);
        }

        /// <summary>
        /// Gibt eine Listung für einen Artikel in einer Bestellung zurück
        /// </summary>
        /// <param name="orderItemId">Id des Artikels in der Bestellung</param>
        /// <returns>Listing oder null, wenn nicht gefunden</returns>
        public async Task<Listing> GetByOrderItemAsync(long orderItemId)
        {
            return await Repository.FirstOrDefaultAsync(c => c.OrderItemId == orderItemId);
        }

        /// <summary>
        /// Setzen des Status von Listungen nach Bestellung
        /// </summary>
        /// <param name="orderId">Id der Bestellung</param>
        /// <param name="status">Zu setzender Status</param>
        /// <param name="reservedDate">Datum das für die Reservierung gesetzt werden soll</param>
        /// <returns>Anzahl betroffener Listungen</returns>
        public async Task<int> SetStatusByOrderAsync(long orderId, ListingStatus status, DateTimeOffset? reservedDate)
        {
            var listings = await Repository.FindAsync(c => c.OrderId == orderId);
            foreach (var listing in listings)
            {
                listing.Status = status;
                listing.ReservedUntil = reservedDate;
            }

            return listings.Count();
        }

        /// <summary>
        /// Setzen des Bezahlstatus von Listingen nach Bestellung
        /// </summary>
        /// <param name="orderId">Id der Bestellung</param>
        /// <param name="status">Zu setzender Status</param>
        /// <returns>Anzahl betroffener Listungen</returns>
        public async Task<int> SetPaymentStatusByOrderAsync(long orderId, PaymentStatus status)
        {
            var listings = await Repository.FindAsync(c => c.OrderId == orderId);
            foreach (var listing in listings)
            {
                listing.PaymentStatus = status;
            }

            return listings.Count();
        }

        /// <summary>
        /// Zurücksetzen von Reservierungen wenn eine Zeit erreicht ist
        /// </summary>
        /// <param name="reservedDate">Obere Grenze der Reservierung</param>
        /// <returns>Anzahl betroffener Listungen</returns>
        public async Task<int> ResetReservedAsync(DateTimeOffset reservedDate)
        {
            var listings = await Repository.FindAsync(c => c.Status == ListingStatus.Reserverd && ((c.ReservedUntil.HasValue && c.ReservedUntil < reservedDate) || c.ReservedUntil == null));
            foreach (var listing in listings)
            {
                listing.ReservedUntil = null;
                listing.Status = ListingStatus.Draft;
            }

            return listings.Count();
        }

        /// <summary>
        /// Gibt eine Liste von Listungen zurück für die Anzeige der Partner in der Nähe
        /// </summary>
        /// <param name="country">Land</param>
        /// <param name="state">Bundesland</param>
        /// <param name="lat">Optional: Breitengrad</param>
        /// <param name="lng">Optional: Längengrad</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <param name="skip">Datensätze auslassen</param>
        /// <param name="take">Datensätze nehmen</param>
        /// <returns>Liste passender Listungen und gesamt verfügbar</returns>
        public async Task<(int total, List<ListingWithNames> list)> GetNearForAppAsync(string country, string state, double lat, double lng, string language, string fallback, int skip, int take)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();
            if (!string.IsNullOrWhiteSpace(country))
                country = country.ToUpperInvariant();
            if (!string.IsNullOrWhiteSpace(state))
                state = state.ToUpperInvariant();
            var geometryFactory = NtsGeometryServices.Instance.CreateGeometryFactory(srid: 4326);
            var location = geometryFactory.CreatePoint(new Coordinate(lng, lat));

            var baseQuery = _namesRepository.QueryStoredProcedure("SELECT * FROM tv_ListingsWithNames({0},{1})", c => c.Deleted == false && c.Status == ListingStatus.Running && c.BranchOnlineStatus == OnlineStatus.Online &&
                                                                                                                      (c.GeoMode == GeoMode.None ||
                                                                                                                       (c.GeoMode == GeoMode.Country && c.Address_CountryCode == country) ||
                                                                                                                       (c.GeoMode == GeoMode.CountryAndState && c.Address_CountryCode == country && c.Address_State == state) ||
                                                                                                                       (c.GeoMode == GeoMode.Location && c.Location.IsWithinDistance(location, c.Radius * 1000))), language, fallback);


            var total = await baseQuery.CountAsync().ConfigureAwait(false);
            //TODO: noch überlegen wie wir eine Lokalisierung machen können
            baseQuery = baseQuery.OrderBy(c => c.ListingLocation.Distance(location));
            baseQuery = baseQuery.Skip(skip).Take(take);
            var list = await baseQuery.ToListAsync().ConfigureAwait(false);

            return (total, list);

        }

        /// <summary>
        /// Gibt eine Liste von Listungen zurück für eine Branche zurück.
        /// Die Sortierung erfolgt nach Listungstyp und dann nach Distanz
        /// </summary>
        /// <param name="branchId">Id der Branche</param>
        /// <param name="filter">Optional: Filter für Name und/oder Ort</param>
        /// <param name="listingCountry">Optional: Listings-Land</param>
        /// <param name="country">Land</param>
        /// <param name="state">Bundesland</param>
        /// <param name="lat">Optional: Breitengrad</param>
        /// <param name="lng">Optional: Längengrad</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <param name="skip">Datensätze auslassen</param>
        /// <param name="take">Datensätze nehmen</param>
        /// <returns>Liste passender Listungen</returns>
        public async Task<(int total, List<ListingWithNames> list)> GetByBranchForAppAsync(string branchId, string filter, string listingCountry, string country, string state, double lat, double lng, string language, string fallback, int skip, int take)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();
            if (!string.IsNullOrWhiteSpace(country))
                country = country.ToUpperInvariant();
            if (!string.IsNullOrWhiteSpace(state))
                state = state.ToUpperInvariant();
            if (!string.IsNullOrWhiteSpace(listingCountry))
                listingCountry = listingCountry.ToUpperInvariant();
            var geometryFactory = NtsGeometryServices.Instance.CreateGeometryFactory(srid: 4326);
            var location = geometryFactory.CreatePoint(new Coordinate(lng, lat));

            var baseQuery = _namesRepository.QueryStoredProcedure("SELECT * FROM tv_ListingsWithNames({0},{1})", c => c.BranchId == branchId && c.Deleted == false && c.Status == ListingStatus.Running && c.BranchOnlineStatus == OnlineStatus.Online &&
                                                                                                                      (c.GeoMode == GeoMode.None ||
                                                                                                                       (c.GeoMode == GeoMode.Country && c.Address_CountryCode == country) ||
                                                                                                                       (c.GeoMode == GeoMode.CountryAndState && c.Address_CountryCode == country && c.Address_State == state) ||
                                                                                                                       (c.GeoMode == GeoMode.Location && c.Location.IsWithinDistance(location, c.Radius * 1000))), language, fallback);
            if (!string.IsNullOrWhiteSpace(filter))
            {
                baseQuery = baseQuery.Where(c => c.Name.Contains(filter) || c.ListingAddress_City.Contains(filter));
            }
            if (!string.IsNullOrWhiteSpace(listingCountry))
            {
                baseQuery = baseQuery.Where(c => c.ListingAddress_CountryCode == listingCountry);
            }

            var total = await baseQuery.CountAsync().ConfigureAwait(false);
            
            var list = await baseQuery.OrderByDescending(c => c.ListingType).ThenBy(c => c.ListingLocation.Distance(location)).Skip(skip).Take(take).ToListAsync().ConfigureAwait(false);
            return (total, list);
        }

        /// <summary>
        /// Gibt eine Listung in einer gewünschten Sprache zurück
        /// </summary>
        /// <param name="id">Id der Listung</param>
        /// <param name="language">Gewünschte Sprache</param>
        /// <param name="fallback">Fallback Sprache</param>
        /// <returns>Gefundene Werbung, null sonst</returns>
        public async Task<ListingWithNames> GetRunningWithNamesAsync(string id, string language, string fallback)
        {
            language = language.ToUpperInvariant();
            fallback = fallback.ToUpperInvariant();

            var baseQuery = _namesRepository.QueryStoredProcedure("SELECT * FROM tv_ListingsWithNames({0},{1})", c => c.Id == id && c.Deleted == false && c.Status == ListingStatus.Running && c.EndDate > DateTimeOffset.UtcNow, language, fallback);
            var result = await baseQuery.FirstOrDefaultAsync().ConfigureAwait(false);
            return result;
        }

        /// <summary>
        /// Starten von gebuchten Listungen wenn diese das Start-Datum erreicht haben
        /// </summary>
        /// <returns>Anzahl gestartete Listungen</returns>
        public async Task<int> StartBookedAsnyc()
        {
            var listings = await Repository.FindAsync(c => c.Status == ListingStatus.Booked && c.Deleted == false && c.StartDate <= DateTimeOffset.UtcNow && c.EndDate.Value >= DateTimeOffset.UtcNow);
            foreach (var listing in listings)
            {
                listing.Status = ListingStatus.Running;
            }

            return listings.Count();
        }

        /// <summary>
        /// Stoppen von abgelaufenen Listungen wenn diese das Enddatum erreicht haben
        /// </summary>
        /// <returns>Anzahl gestoppte Listungen</returns>
        public async Task<int> StopRunningAsync()
        {
            var listings = await Repository.FindAsync(c => c.Status == ListingStatus.Running && c.Deleted == false && c.EndDate.Value <= DateTimeOffset.UtcNow);
            foreach (var listing in listings)
            {
                listing.Status = ListingStatus.Ended;
            }

            return listings.Count();
        }
    }
}