using BeWo.Data.Access;
using BeWo.Data.Entities;
using System;
using System.Collections.Generic;
using System.Linq;

namespace BeWo.Service.ServiceUtils.DistanceCalculator
{
    public static class AddressRouteManager
    {
        public static IDistanceAPI DistanceAPI { get; set; }

        static AddressRouteManager()
        {
            DistanceAPI =
                //new GoogleDistanceMatrixApi(); 
                new OpenrouteServiceAPI();
        }

        public static AddressRouteMatrix GetMatrix(Address[] origins, Address[] destinations)
        {
            var routes = DAOFactory.GenericDAO.GetAll<AddressRoute>();
            var matrix = new AddressRouteMatrix(origins, destinations);

            LoadExistingData(ref matrix, routes, out var needUpdate);

            var requests = needUpdate.Union(matrix.GetUnkownRoutes()).ToList();

            // Alles aktuell
            if (!requests.Any())
                return matrix;

            var ori2req = requests.Select(x => x.Origin).ToHashSet();
            var des2req = requests.Select(x => x.Destination).ToHashSet();

            DistanceAPI.RequestMissingData(ref matrix, ori2req, des2req);
            
            foreach (var req in requests)
            {
                var route = matrix.GetRoute(req.Origin, req.Destination);

                if (route is null)
                    throw new NotImplementedException("Unerwartetes Verhalten #4314513094871");

                route.Origin_Version = route.Origin.Version.Value;
                route.Destination_Version = route.Destination.Version.Value;

                if (!route.Version.HasValue)
                {
                    // Neu
                    DAOFactory.GenericDAO.Insert(req);
                }
                else
                {
                    // Update
                    DAOFactory.GenericDAO.Update(req);
                }
            }

            return matrix;
        }

        public static void LoadExistingData(ref AddressRouteMatrix matrix, IList<AddressRoute> routes, out List<AddressRoute> needUpdate)
        {
            needUpdate = new List<AddressRoute>();

            foreach (var route in routes)
            {
                var origin = route.Origin;
                var destination = route.Destination;

                if (!matrix.CanUseRoute(origin, destination))
                    continue;

                if (origin.Version == route.Origin_Version && destination.Version == route.Destination_Version)
                {
                    // Ist aktuell
                    matrix.SetRoute(origin, destination, route);
                }
                else
                {
                    // Braucht Update
                    matrix.SetRoute(origin, destination, route);
                    needUpdate.Add(route);
                }
            }
        }

        public static string AddressToString(Address address)
        {
            return $"{address.Street}, {address.PostalCode}, {address.Town}, {address.State}, {address.Country}";
        }
    }
}