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

namespace ConfectioneryDatabaseImplement.Implements
{
	public class OrderStorage : IOrderStorage
	{
		public OrderViewModel? Delete(OrderBindingModel model)
		{
			using var context = new ConfectioneryDatabase();

			var element = context.Orders.FirstOrDefault(rec => rec.Id == model.Id);

			if (element != null)
			{
				context.Orders.Remove(element);
				context.SaveChanges();

				return GetViewModel(element);
			}

			return null;
		}

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

			using var context = new ConfectioneryDatabase();

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

		public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
		{
            using var context = new ConfectioneryDatabase();
            if (model.Id.HasValue)
            {
                return context.Orders
                    .Include(x => x.Pastry)
                    .Where(x => x.Id == model.Id)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else if (model.DateFrom != null && model.DateTo != null)
            {
                return context.Orders
                    .Include(x => x.Pastry)
                    .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else
            {
                return new();
            }
        }

		public List<OrderViewModel> GetFullList()
		{
			using var context = new ConfectioneryDatabase();

			return context.Orders.Select(x => GetViewModel(x)).ToList();
		}

		public OrderViewModel? Insert(OrderBindingModel model)
		{
			var newOrder = Order.Create(model);
			if (newOrder == null)
			{
				return null;
			}

			using var context = new ConfectioneryDatabase();

			context.Orders.Add(newOrder);
			context.SaveChanges();
			return GetViewModel(newOrder);
		}

		public OrderViewModel? Update(OrderBindingModel model)
		{
			using var context = new ConfectioneryDatabase();

			var order = context.Orders.FirstOrDefault(x => x.Id == model.Id);

			if (order == null)
			{
				return null;
			}

			order.Update(model);
			context.SaveChanges();

			return GetViewModel(order);
		}

		private static OrderViewModel GetViewModel(Order order)
		{
			var viewModel = order.GetViewModel;
			using var context = new ConfectioneryDatabase();
			var element = context.Pastries.FirstOrDefault(x => x.Id == order.PastryId);
			viewModel.PastryName = element.PastryName;
			return viewModel;
		}
	}
}