using CarpentryWorkshopContracts.BindingModels;
using CarpentryWorkshopContracts.SearchModels;
using CarpentryWorkshopContracts.StoragesContracts;
using CarpentryWorkshopContracts.ViewModels;
using CarpentryWorkshopFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CarpentryWorkshopFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton source;
        public OrderStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
		public List<OrderViewModel> GetFullList()
		{
			return source.Orders.Select(x => GetViewModel(x)).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 null;
			}

			return source.Orders.FirstOrDefault(x =>
				(model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
		}

		private OrderViewModel GetViewModel(Order order)
		{
			var viewModel = order.GetViewModel;
			var wood = source
				.Woods.FirstOrDefault(x => x.Id == order.WoodId);
			var client = source
				.Clients.FirstOrDefault(x => x.Id == order.ClientId);

			if (wood != null)
				viewModel.WoodName = wood.WoodName;
			if (client != null)
				viewModel.ClientFIO = client.ClientFIO;
			return viewModel;
		}

		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 GetViewModel(newOrder);
		}

		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 GetViewModel(order);
		}

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