PIbd-23-Radaev-A.V.-GiftShop/GiftShop/GiftShopListImplement/Implements/ShopStorage.cs

using GiftShopContracts.BindingModels;
using GiftShopContracts.SearchModels;
using GiftShopContracts.StoragesContracts;
using GiftShopContracts.ViewModels;
using GiftShopListImplement.Models;
using GiftShopDataModels.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;

namespace GiftShopListImplement.Implements
{
    public class ShopStorage : IShopStorage
    {
        private readonly DataListSingleton _source;
        public ShopStorage()
        {
            _source = DataListSingleton.GetInstance();
        }
        public ShopViewModel? Delete(ShopBindingModel model)
        {
            for (int i = 0; i < _source.Shops.Count; ++i)
            {
                if (_source.Shops[i].Id == model.Id)
                {
                    var element = _source.Shops[i];
                    _source.Shops.RemoveAt(i);
                    return element.GetViewModel;
                }
            }
            return null;
        }

        public ShopViewModel? GetElement(ShopSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ShopName) && !model.Id.HasValue)
            {
                return null;
            }

            foreach (var shop in _source.Shops)
            {
                if ((!string.IsNullOrEmpty(model.ShopName) && shop.ShopName == model.ShopName) || (model.Id.HasValue && shop.Id == model.Id))
                {
                    return shop.GetViewModel;
                }
            }

            return null;
        }

        public List<ShopViewModel> GetFilteredList(ShopSearchModel model)
        {
            var result = new List<ShopViewModel>();

            if (string.IsNullOrEmpty(model.ShopName))
            {
                return result;
            }

            foreach (var shop in _source.Shops)
            {
                if (shop.ShopName.Contains(model.ShopName))
                {
                    result.Add(shop.GetViewModel);
                }
            }

            return result;
        }

        public List<ShopViewModel> GetFullList()
        {
            var result = new List<ShopViewModel>();

            foreach (var shop in _source.Shops)
            {
                result.Add(shop.GetViewModel);
            }

            return result;
        }

        public ShopViewModel? Insert(ShopBindingModel model)
        {
            model.Id = 1;

            foreach (var shop in _source.Shops)
            {
                if (model.Id <= shop.Id)
                {
                    model.Id = shop.Id + 1;
                }
            }

            var newShop = Shop.Create(model);

            if (newShop == null)
            {
                return null;
            }

            _source.Shops.Add(newShop);

            return newShop.GetViewModel;
        }

        public ShopViewModel? Update(ShopBindingModel model)
        {
            foreach (var shop in _source.Shops)
            {
                if (shop.Id == model.Id)
                {
                    shop.Update(model);
                    return shop.GetViewModel;
                }
            }

            return null;
        }
		public bool CheckAvailability(int giftId, int count)
		{
			int minus = _source.Shops.Select(x => x.ShopGifts.Select(y => (y.Value.Item1.Id == giftId ? y.Value.Item2 : 0)).Sum()).Sum();
			count -= minus;
			return count <= 0;
		}
		public bool SellGifts(IGiftModel model, int count)
        {

			var gift = _source.Gifts.FirstOrDefault(x => x.Id == model.Id);

			if (gift == null || !CheckAvailability(gift.Id, count))
			{
				return false;
			}

			for (int i = 0; i < _source.Shops.Count; i++)
            {
                var shop = _source.Shops[i];
                var gifts = shop.ShopGifts;

                foreach (var shopgift in gifts.Where(x => x.Value.Item1.Id == gift.Id))
                {
                    var min = Math.Min(shopgift.Value.Item2, count);
                    gifts[shopgift.Value.Item1.Id] = (shopgift.Value.Item1, shopgift.Value.Item2 - min);
                    count -= min;

                    if (count <= 0)
                    {
                        break;
                    }
                }

                shop.Update(new ShopBindingModel
                {
                    Id = shop.Id,
                    ShopName = shop.ShopName,
                    ShopAdress = shop.ShopAdress,
                    OpeningDate = shop.OpeningDate,
                    MaxCapacity = shop.MaxCapacity,
                    ShopGifts = gifts
                });
            }
            return true;
        }
    }
}