CourseWork_CompShop/ComputerShopProvider/ComputerShopDatabaseImplement/Implements/PurchaseStorage.cs

using ComputerShopContracts.BindingModels;
using ComputerShopContracts.SearchModels;
using ComputerShopContracts.StorageContracts;
using ComputerShopContracts.ViewModels;
using ComputerShopDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputerShopDatabaseImplement.Implements
{
    public class PurchaseStorage : IPurchaseStorage
    {
        public PurchaseViewModel? GetElement(PurchaseSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new ComputerShopDatabase();
            return context.Purchases.Include(x => x.Component)
                .FirstOrDefault(x => 
                (model.Id.HasValue && x.Id == 
                model.Id))
                ?.GetViewModel;
        }

        public List<PurchaseViewModel> GetFilteredList(PurchaseSearchModel model)
        {
            if (!model.Id.HasValue && !model.DateFrom.HasValue && !model.DateTo.HasValue && !model.ClientId.HasValue && !model.DateFrom.HasValue && !model.DateTo.HasValue)
            {
                return new();
            }
            using var context = new ComputerShopDatabase();
            if (model.DateFrom.HasValue && model.DateTo.HasValue)
                return context.Purchases
                    .Include(x => x.Component)
                    .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                    .Select(x => x.GetViewModel)
                    .ToList();
            if (model.ClientId.HasValue)
            {
                return context.Purchases
                    .Include(x => x.Client)
                    .Where(x => x.ClientId == model.ClientId)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            return context.Purchases
            .Where(x => x.Id == model.Id)
            .Include(x => x.Component)
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public List<PurchaseViewModel> GetFullList()
        {
            using var context = new ComputerShopDatabase();
            return context.Purchases.Include(x => x.Component).Select(x => x.GetViewModel).ToList();
        }

        public PurchaseViewModel? Insert(PurchaseBindingModel model)
        {
            var newOrder = Purchase.Create(model);
            if (newOrder == null)
            {
                return null;
            }
            using var context = new ComputerShopDatabase();
            context.Purchases.Add(newOrder);
            context.SaveChanges();
            return context.Purchases.Include(x => x.Component).FirstOrDefault(x => x.Id == newOrder.Id)?.GetViewModel;
        }

        public PurchaseViewModel? Update(PurchaseBindingModel model)
        {
            using var context = new ComputerShopDatabase();
            var order = context.Purchases.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            context.SaveChanges();
            return context.Purchases.Include(x => x.Component).FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }
        public PurchaseViewModel? Delete(PurchaseBindingModel model)
        {
            using var context = new ComputerShopDatabase();
            var element = context.Purchases.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Purchases.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}