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

namespace DinerDataBaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new DinerDataBase();
            var element = context.Orders.FirstOrDefault(x => x.ID == model.ID);
            if (element != null)
            {
                context.Orders.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.ID.HasValue) { 
                return null; 
            } 
            using var context = new DinerDataBase();
            return context.Orders
                .Include(x => x.Snack)
                .Include(x => x.Client)
                .FirstOrDefault(x => (model.ID.HasValue && x.ID == model.ID))
                ?.GetViewModel;
        }

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

			return new();
		}

        public List<OrderViewModel> GetFullList()
        {
            using var context = new DinerDataBase();
            return context.Orders.Include(x => x.Snack).Include(x => x.Client).Select(x => x.GetViewModel).ToList();
		}
        public OrderViewModel? Insert(OrderBindingModel model)
        {
            using var context = new DinerDataBase();
            var newOrder = Order.Create(model);
            if (newOrder == null) { 
                return null; 
            }
            context.Orders.Add(newOrder);
            context.SaveChanges();
			return context.Orders.Include(x => x.Snack)
								 .Include(x => x.Client)
				                 .FirstOrDefault(x => x.ID == newOrder.ID)?.GetViewModel;
		}
        public OrderViewModel? Update(OrderBindingModel model) {
            using var context = new DinerDataBase();
            var order = context.Orders.FirstOrDefault(x => x.ID == model.ID);
            if (order == null) { return null; }
            order.Update(model);
            context.SaveChanges();
            return order.GetViewModel;
        }
       
    }
}