using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContracts;
using ConfectioneryContracts.ViewModels;
using ConfectioneryFileImplement.Models;

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

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

		public List<OrderViewModel> GetFullList()
		{
			return source.Orders
					.Select(x => AddInfo(x.GetViewModel))
					.ToList();
		}

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

		public OrderViewModel? GetElement(OrderSearchModel model)
		{
			if (!model.Id.HasValue && !model.ImplementerId.HasValue)
			{
				return null;
			}
			var order = source.Orders.FirstOrDefault(x =>
				model.ImplementerId.HasValue && x.ImplementerId == model.ImplementerId && model.Status != null && x.Status.Equals(model.Status)
				|| model.Status == null && model.ImplementerId.HasValue && x.ImplementerId == model.ImplementerId
				|| model.Id.HasValue && x.Id == model.Id);
			return order?.GetViewModel != null ? AddInfo(order.GetViewModel) : null;
		}

		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 AddInfo(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 AddInfo(order.GetViewModel);
		}

		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 AddInfo(element.GetViewModel);
			}
			return null;
		}

		private OrderViewModel AddInfo(OrderViewModel model)
		{
			var selectedPastry = source.Pastrys.FirstOrDefault(x => x.Id == model.PastryId);
			model.PastryName = selectedPastry?.PastryName ?? string.Empty;
			var selectedClient = source.Clients.FirstOrDefault(x => x.Id == model.ClientId);
			model.ClientFIO = selectedClient?.ClientFIO ?? string.Empty;
			return model;
		}
	}
}