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

using GiftShopContracts.BindingModels;
using GiftShopContracts.SearchModels;
using GiftShopContracts.StoragesContracts;
using GiftShopContracts.ViewModels;
using GiftShopListImplement.Models;

namespace GiftShopListImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataListSingleton _source;
        public OrderStorage()
        {
            _source = DataListSingleton.GetInstance();
        }
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            for (int i = 0; i < _source.Orders.Count; ++i)
            {
                if (_source.Orders[i].Id == model.Id)
                {
                    var element = _source.Orders[i];
                    _source.Orders.RemoveAt(i);
                    return element.GetViewModel;
                }
            }

            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            foreach (var order in _source.Orders)
            {
                if (model.Id.HasValue && order.Id == model.Id)
                {
                    return order.GetViewModel;
                }
            }

            return null;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
			List<OrderViewModel> list = new();
			if (!model.Id.HasValue || model.Id == 0)
			{
				foreach (Order order in _source.Orders)
				{
					if (order.DateCreate >= model.DateFrom && order.DateCreate <= model.DateTo)
					{
						list.Add(order.GetViewModel);
					}
				}
			}
			else
			{
				foreach (Order order in _source.Orders)
				{
					if (order.Id == model.Id)
					{
						list.Add(order.GetViewModel);
					}
				}
			}
			return list;
		}

        public List<OrderViewModel> GetFullList()
        {
			List<OrderViewModel> list = new();
			foreach (Order order in _source.Orders)
			{
				list.Add(order.GetViewModel);
			}
			return list;
		}

        public OrderViewModel? Insert(OrderBindingModel model)
        {
			model.Id = 1;
			foreach (Order order in _source.Orders)
			{
				if (model.Id <= order.Id)
				{
					model.Id = order.Id;
				}
			}
			Order? newOrder = Order.Create(model);
			if (newOrder == null)
			{
				return null;
			}
			_source.Orders.Add(newOrder);
			return newOrder.GetViewModel;
		}

        public OrderViewModel? Update(OrderBindingModel model)
        {
			foreach (Order order in _source.Orders)
			{
				if (order.Id == model.Id)
				{
					order.Update(model);
					return order.GetViewModel;
				}
			}
			return null;
        }
    }
}