using SushiBarContracts.BindingModels;
using SushiBarContracts.SearchModels;
using SushiBarContracts.StoragesContracts;
using SushiBarContracts.ViewModels;
using SushiBarFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SushiBarFileImplement.Implements
{
	public class OrderStorage : IOrderStorage
	{
		private readonly DataFileSingleton source;

		public OrderStorage()
		{
			source = DataFileSingleton.GetInstance();
		}

		public List<OrderViewModel> GetFullList() => source.Orders.Select(x => AttachSushiName(x.GetViewModel)).ToList();

		public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
		{
			if (model.DateFrom.HasValue)
			{
				return source.Orders.Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
					.Select(x => GetViewModel(x)).ToList();
			}
			if (model.ClientId.HasValue && !model.Id.HasValue)
			{
				return source.Orders.Where(x => x.ClientId == model.ClientId).Select(x => x.GetViewModel).ToList();
			}

			if (model.Id.HasValue)
			{
				return source.Orders.Where(x => x.Id.Equals(model.Id)).Select(x => GetViewModel(x)).ToList();
			}
			return new();
		}

		public OrderViewModel? GetElement(OrderSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return new();
			}
			return AttachSushiName(source.Orders.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel);
		}

		public OrderViewModel? Insert(OrderBindingModel model)
		{
			model.Id = source.Orders.Count > 0 ? source.Orders.Max(x => x.Id) + 1 : 1;
			var newOrder = Order.Create(model);
			if (newOrder == null)
			{
				return null;
			}
			source.Orders.Add(newOrder);
			source.SaveOrders();
			return AttachSushiName(newOrder.GetViewModel);
		}

		public OrderViewModel? Update(OrderBindingModel model)
		{
			var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
			if (order == null)
			{
				return null;
			}
			order.Update(model);
			source.SaveOrders();
			return AttachSushiName(order.GetViewModel);
		}

		public OrderViewModel? Delete(OrderBindingModel model)
		{
			var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
			if (order != null)
			{
				source.Orders.Remove(order);
				source.SaveOrders();
				return AttachSushiName(order.GetViewModel);
			}
			return null;
		}

		private OrderViewModel? AttachSushiName(OrderViewModel? model)
		{
			if (model == null)
			{
				return null;
			}
			var sushi = source.Sushis.FirstOrDefault(x => x.Id == model.SushiId);
			if (sushi != null)
			{
				model.SushiName = sushi.SushiName;
			}
			return model;
		}

		private OrderViewModel GetViewModel(Order order)
		{
			var viewModel = order.GetViewModel;

			var sushi = source.Sushis.FirstOrDefault(x => x.Id == order.SushiId);
			var client = source.Clients.FirstOrDefault(x => x.Id == order.ClientId);

			if (sushi != null)
			{
				viewModel.SushiName = sushi.SushiName;
			}
			if (client != null)
			{
				viewModel.ClientFIO = client.ClientFIO;
			}
			return viewModel;
		}
	}
}