CourseWorkElectronicsShop/ElectronicsShop/ElectronicsShopDataBaseImplement/Implements/OrderStorage.cs

using ElectronicsShopContracts.BindingModels;
using ElectronicsShopContracts.SearchModels;
using ElectronicsShopContracts.StorageContracts;
using ElectronicsShopContracts.ViewModels;
using ElectronicsShopDataBaseImplement.Models;
using Microsoft.EntityFrameworkCore;


namespace ElectronicsShopDataBaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public OrderViewModel? Insert(OrderBindingModel model)
        {
            using var context = new Database();
            var newComponent = Order.Create(context,model);
            if (newComponent == null)
            {
                return null;
            }
            context.Orders.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }

		public OrderViewModel? Update(OrderBindingModel model) {
			using var context = new Database();
            using var transcation = context.Database.BeginTransaction();
            try {
                var product = context.Orders.FirstOrDefault(rec => rec.ID == model.ID);
                if (product == null) {
                    return null;
                }
                product.UpdateProducts(context, model);
                transcation.Commit();
                return product.GetViewModel;
            }
            catch {
                transcation.Rollback();
                throw;
            }
		}

		public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new Database();
            var element = context.Orders.FirstOrDefault(rec => rec.ID == model.ID);
            if (element != null)
            {
                context.Orders.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.ID.HasValue)
            {
                return null;
            }
            using var context = new Database();
            return context.Orders
                .Include(x => x.Payments)
                .Include(x => x.Products)
                .ThenInclude(x => x._product)
                .FirstOrDefault(x => (model.ID.HasValue && x.ID == model.ID))?.GetViewModel;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
			using var context = new Database();
			if (!model.ID.HasValue && (model.DateFrom == null || model.DateTo == null))
            {
                return new();
            }
            else if (model.ClientID.HasValue) {
                return context.Orders
                    .Include (x => x.Products)
                    .Where(x => x.ClientID == model.ClientID)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            return context.Orders
                .Include(x => x.Products)
                .ThenInclude(x => x._product)
                .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<OrderViewModel> GetFullList()
        {
            using var context = new Database();
            return context.Orders
                .Include(x => x.Products)
                .ThenInclude(x => x._product).ToList()
                .Select(x => x.GetViewModel).ToList();
        }

	}
}