using ComputerShopContracts.BindingModels;
using ComputerShopContracts.SearchModels;
using ComputerShopContracts.StorageContracts;
using ComputerShopContracts.ViewModels;
using ComputerShopDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputerShopDatabaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new ComputerShopDatabase();
            var element = context.Orders.FirstOrDefault(rec => rec.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 ComputerShopDatabase();
            return context.Orders.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?.GetViewModel;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            
            if (!model.ClientId.HasValue)
			{
				return new();
			}
			using var context = new ComputerShopDatabase();
			if (model.DateFrom.HasValue & model.DateTo.HasValue)
            {
                return context.Orders
                .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                .Include(x => x.OrderComponents).Include(x => x.Client)
                .Select(x => x.GetViewModel)
                .ToList();
            }

			return context.Orders
				.Include(x => x.Components)
				.ThenInclude(x => x.Component)
				.Where(x => x.ClientId == model.ClientId)
				.Select(x => x.GetViewModel)
				.ToList();
            
		}

        public List<OrderViewModel> GetFullList()
        {
            using var context = new ComputerShopDatabase();
			return context.Orders
				.Include(x => x.OrderComponents).Include(x => x.Client)
				.Select(x => x.GetViewModel)
				.ToList();
		}

        public OrderViewModel? Insert(OrderBindingModel model)
        {
			using var context = new ComputerShopDatabase();
			var newOrder = Order.Create(context, model);

            if (newOrder == null)
            {
                return null;
            }
            context.Orders.Add(newOrder);
            context.SaveChanges();
            return newOrder.GetViewModel;
		}

        public OrderViewModel? Update(OrderBindingModel model)
        {
            using var context = new ComputerShopDatabase();
            var order = context.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            context.SaveChanges();
            return order.GetViewModel;
        }

        public ComponentViewModel? GetComponentsByOrder(OrderSearchModel model)
        {
			using var context = new ComputerShopDatabase();
            var order_components = context.OrderComponents.FirstOrDefault(x => x.OrderId == model.Id);
			if (order_components == null)
			{
				return null;
			}
			var components = context.Components.FirstOrDefault(x => x.Id == order_components.Id);
			if (components == null)
			{
				return null;
			}
			return components.GetViewModel;
		}
    }
}