using IceCreamShopContracts.BindingModels;
using IceCreamShopContracts.SearchModels;
using IceCreamShopContracts.StoragesContracts;
using IceCreamShopContracts.ViewModels;
using IceCreamShopDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IceCreamShopDatabaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public List<OrderViewModel> GetFullList()
        {
            using var context = new IceCreamShopDataBase();
            return context.Orders
            .Select(x => AccessIceCreamStorage(x.GetViewModel))
           .ToList();
        }
        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            using var context = new IceCreamShopDataBase();
            return context.Orders
            .Where(x => x.Id == model.Id)
           .Select(x => AccessIceCreamStorage(x.GetViewModel))
           .ToList();
        }
        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new IceCreamShopDataBase();
            return AccessIceCreamStorage(context.Orders.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel);
        }
        public OrderViewModel? Insert(OrderBindingModel model)
        {
            var newOrder = Order.Create(model);
            if (newOrder == null)
            {
                return null;
            }
            using var context = new IceCreamShopDataBase();
            context.Orders.Add(newOrder);
            context.SaveChanges();
            return AccessIceCreamStorage(newOrder.GetViewModel);
        }
        public OrderViewModel? Update(OrderBindingModel model)
        {
            using var context = new IceCreamShopDataBase();
            var order = context.Orders.FirstOrDefault(x => x.Id ==
           model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            context.SaveChanges();
            return AccessIceCreamStorage(order.GetViewModel);
        }
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new IceCreamShopDataBase();
            var element = context.Orders.FirstOrDefault(rec => rec.Id ==
           model.Id);
            if (element != null)
            {
                context.Orders.Remove(element);
                context.SaveChanges();
                return AccessIceCreamStorage(element.GetViewModel);
            }
            return null;
        }

        public static OrderViewModel AccessIceCreamStorage(OrderViewModel model)
        {
            if (model == null)
                return null;
            using var context = new IceCreamShopDataBase();
            var iceCream = context.IceCreams.FirstOrDefault(x => (x.Id == model.IceCreamId));
            if (iceCream == null)
                return model;
            model.IceCreamName = iceCream.IceCreamName;
            return model;
        }
    }
}