Computer_Hardware_Store/HardwareShop/HardwareShopDatabaseImplement/Models/Purchase.cs

using HardwareShopContracts.BindingModels;
using HardwareShopContracts.ViewModels;
using HardwareShopDataModels.Enums;
using HardwareShopDataModels.Models;
using System.ComponentModel.DataAnnotations.Schema;
using System.Diagnostics;

namespace HardwareShopDatabaseImplement.Models
{
    public class Purchase : IPurchaseModel
    {
        public int Id { get; set; }

        public decimal Sum { get; set; }

        public PurchaseStatus PurchaseStatus { get; set; } = PurchaseStatus.Неизвестен;

        public DateTime? DatePurchase { get; set; }

        public int UserID { get; set; }

        public virtual User User { get; set; }

        [ForeignKey("PurchaseId")]
        public virtual List<PurchaseBuild>? Builds { get; set; }

        public Dictionary<int, (IBuildModel, int)>? _purchaseBuilds = null;

        [NotMapped]
        public Dictionary<int, (IBuildModel, int)>? PurchaseBuilds
        {
            get
            {
                if (_purchaseBuilds == null)
                {
                    _purchaseBuilds = Builds.ToDictionary(recPB => recPB.BuildID, recPB => (recPB.Build as IBuildModel, recPB.Count));
                }
                return _purchaseBuilds;
            }
        }

        [ForeignKey("PurchaseId")]
        public virtual List<PurchaseGood> Goods { get; set; } = new();

        public Dictionary<int, (IGoodModel, int)>? _purchaseGoods = null;
        [NotMapped]
        public Dictionary<int, (IGoodModel, int)>? PurchaseGoods
        {
            get
            {
                if (_purchaseGoods == null)
                {
                    _purchaseGoods = Goods.ToDictionary(recPG => recPG.GoodID, recPG => (recPG.Good as IGoodModel, recPG.Count));
                }
                return _purchaseGoods;
            }
        }

        public static Purchase Create(HardwareShopDatabase context, PurchaseBindingModel model)
        {
            return new Purchase()
            {
                Id = model.Id,
                Sum = model.Sum,
                PurchaseStatus = model.PurchaseStatus,
                DatePurchase = model.DatePurchase,
                UserID = model.UserID,
                Builds = model.PurchaseBuilds.Select(x => new PurchaseBuild
                {
                    Build = context.Builds.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList(),
                Goods = model.PurchaseGoods.Select(x => new PurchaseGood
                {
                    Good = context.Goods.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(PurchaseBindingModel model)
        {
            PurchaseStatus = model.PurchaseStatus;
            DatePurchase = model.DatePurchase;
        }

        public PurchaseViewModel GetViewModel => new()
        {
            Id = Id,
            Sum = Sum,
            PurchaseStatus = PurchaseStatus,
            DatePurchase = DatePurchase,
            UserID = UserID,
            UserEmail = User.Email,
            PurchaseBuilds = PurchaseBuilds,
            PurchaseGoods = PurchaseGoods
        };

        public void UpdateBuilds(HardwareShopDatabase context, PurchaseBindingModel model)
        {
            var purchaseBuilds = context.PurchasesBuilds.Where(rec => rec.PurchaseID == model.Id).ToList();
            if (purchaseBuilds != null && purchaseBuilds.Count > 0)
            {
                context.PurchasesBuilds.RemoveRange(purchaseBuilds.Where(rec => !model.PurchaseBuilds.ContainsKey(rec.BuildID)));
                context.SaveChanges();
                foreach (var updateBuild in purchaseBuilds)
                {
                    updateBuild.Count = model.PurchaseBuilds[updateBuild.BuildID].Item2;
                    model.PurchaseBuilds.Remove(updateBuild.BuildID);
                }
                context.SaveChanges();
            }
            var purchase = context.Purchases.First(x => x.Id == Id);
            foreach (var dc in model.PurchaseBuilds)
            {
                context.PurchasesBuilds.Add(new PurchaseBuild
                {
                    Purchase = purchase,
                    Build = context.Builds.First(x => x.Id == dc.Key),
                    Count = dc.Value.Item2
                });
                context.SaveChanges();
            }
            _purchaseBuilds = null;
        }

        public void UpdateGoods(HardwareShopDatabase context, PurchaseBindingModel model)
        {
            var purchaseGoods = context.PurchasesGoods.Where(rec => rec.PurchaseID == model.Id).ToList();
            if (purchaseGoods != null && purchaseGoods.Count > 0)
            {   // удалили те в бд, которых нет в модели
                context.PurchasesGoods.RemoveRange(purchaseGoods.Where(rec => !model.PurchaseGoods.ContainsKey(rec.GoodID)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateGood in purchaseGoods)
                {
                    updateGood.Count = model.PurchaseGoods[updateGood.GoodID].Item2;
                    model.PurchaseGoods.Remove(updateGood.GoodID);
                }
                context.SaveChanges();
            }
            var purchase = context.Purchases.First(x => x.Id == Id);
            //добавляем в бд блюда которые есть в моделе, но ещё нет в бд
            foreach (var dc in model.PurchaseGoods)
            {
                context.PurchasesGoods.Add(new PurchaseGood
                {
                    Purchase = purchase,
                    Good = context.Goods.First(x => x.Id == dc.Key),
                    Count = dc.Value.Item2
                });
                context.SaveChanges();
            }
            _purchaseGoods = null;
        }
    }
}