using Contracts.BindingModels;
using Contracts.SearchModels;
using Contracts.StorageContracts;
using Contracts.ViewModels;
using DatabaseImplements.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplements.Implements
{
    public class DeliveryStorage : IDeliveryStorage
    {
        public DeliveryViewModel? Delete(DeliveryBindingModel model)
        {
            using var context = new DeliveryDataBase();
            var element = context.Deliverys.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Deliverys.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public DeliveryViewModel? GetElement(DeliverySearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new DeliveryDataBase();
            return context.Deliverys.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }

        public List<DeliveryViewModel> GetFilteredList(DeliverySearchModel model)
        {
            using var context = new DeliveryDataBase();
            return context.Deliverys
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public List<DeliveryViewModel> GetFullList()
        {
            using var context = new DeliveryDataBase();
            return context.Deliverys
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public DeliveryViewModel? Insert(DeliveryBindingModel model)
        {
            using var context = new DeliveryDataBase();
            using var transaction = context.Database.BeginTransaction();
            {
                try
                {
                    var newDl = Delivery.Create(model);
                    if (newDl == null)
                    {
                        transaction.Rollback();
                        return null;
                    }
                    context.Deliverys.Add(newDl);

                    context.SaveChanges();
                    context.Database.CommitTransaction();

                    return newDl.GetViewModel;
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    return null;
                }
            }
        }

        public DeliveryViewModel? Update(DeliveryBindingModel model)
        {
            using var context = new DeliveryDataBase();
            using var transaction = context.Database.BeginTransaction();
            {
                try
                {
                    var dl = context.Deliverys.FirstOrDefault(x => x.Id == model.Id);
                    if (dl == null)
                    {
                        transaction.Rollback();
                        return null;
                    }
                    dl.Update(model);

                    context.SaveChanges();
                    context.Database.CommitTransaction();

                    return dl.GetViewModel;
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    return null;
                }
            }
        }
    }
}