using ComputersShopContracts.BindingModels;
using ComputersShopContracts.SearchModels;
using ComputersShopContracts.StoragesContracts;
using ComputersShopContracts.ViewModels;
using ComputersShopListImplement;
using ComputersShopListImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OrdersShopListImplement.Implements
{
	public class OrderStorage : IOrderStorage
	{
		private readonly DataListSingleton _source;
		public OrderStorage()
		{
			_source = DataListSingleton.GetInstance();
		}
		public List<OrderViewModel> GetFullList()
		{
			var result = new List<OrderViewModel>();
			foreach (var Order in _source.Orders)
			{
				result.Add(GetViewModel(Order));
			}
			return result;
		}
		public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
		{
			var result = new List<OrderViewModel>();
			foreach (var order in _source.Orders)
			{
				if (order.Id == model.Id)
				{
					return new() { GetViewModel(order) };
				}
				else if (model.DateFrom.HasValue && model.DateTo.HasValue && model.DateFrom <= order.DateCreate.Date && order.DateCreate.Date <= model.DateTo)
				{
					result.Add(GetViewModel(order));
				}
				else if (model.ClientId.HasValue && order.ClientId == model.ClientId)
				{
					result.Add(GetViewModel(order));
				}
			}
			return result;
		}
		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 GetViewModel(Order);
				}
			}
			return null;
		}
		public OrderViewModel? Insert(OrderBindingModel model)
		{
			model.Id = 1;
			foreach (var Order in _source.Orders)
			{
				if (model.Id <= Order.Id)
				{
					model.Id = Order.Id + 1;
				}
			}
			var newOrder = Order.Create(model);
			if (newOrder == null)
			{
				return null;
			}
			_source.Orders.Add(newOrder);
			return GetViewModel(newOrder);
		}
		public OrderViewModel? Update(OrderBindingModel model)
		{
			foreach (var Order in _source.Orders)
			{
				if (Order.Id == model.Id)
				{
					Order.Update(model);
					return GetViewModel(Order);
				}
			}
			return null;
		}
		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 GetViewModel(element);
				}
			}
			return null;
		}

		private OrderViewModel GetViewModel(Order order)
        {
            var viewModel = order.GetViewModel;
            foreach (var comp in _source.Computers)
            {
                if (comp.Id == order.ComputerId)
                {
                    viewModel.ComputerName = comp.ComputerName;
                    break;
                }
            }
			foreach (var client in _source.Clients)
			{
				if (client.Id == order.ClientId)
				{
					viewModel.ClientFIO = client.ClientFIO;
					break;
				}
			}
			return viewModel;
        }
	}
}