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 RequestStorage : IRequestStorage
	{
		public List<RequestViewModel> GetFullList()
		{
			using var context = new ComputerShopDatabase();
			return context.Requests
				.Include(x => x.Assembly)
				.ToList()
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public RequestViewModel? GetElement(RequestSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}
			using var context = new ComputerShopDatabase();
			return context.Requests
				.Include(x => x.Assembly)
				.FirstOrDefault(x => x.Id == model.Id)
				?.GetViewModel;
		}

		public RequestViewModel? Insert(RequestBindingModel model)
		{
			using var context = new ComputerShopDatabase();
			var newRequest = Request.Create(context, model);
			if (newRequest == null)
			{
				return null;
			}
			context.Requests.Add(newRequest);
			context.SaveChanges();
			return newRequest.GetViewModel;
		}

		public RequestViewModel? Update(RequestBindingModel model)
		{
			using var context = new ComputerShopDatabase();
			using var transaction = context.Database.BeginTransaction();
			try
			{
				var request = context.Requests.FirstOrDefault(x => x.Id == model.Id);
				if (request == null)
				{
					return null;
				}
				request.Update(model);
				context.SaveChanges();
				transaction.Commit();
				return request.GetViewModel;
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}

		public RequestViewModel? Delete(RequestBindingModel model)
		{
			using var context = new ComputerShopDatabase();
			var request = context.Requests
				.FirstOrDefault(y => y.Id == model.Id);
			if (request != null)
			{
				context.Requests.Remove(request);
				context.SaveChanges();
				return request.GetViewModel;
			}
			return null;
		}

		public bool ConnectRequestAssembly(int requestId, int assemblyId)
		{
			using var context = new ComputerShopDatabase();
			var request = context.Requests.FirstOrDefault(x => x.Id == requestId);
			var assembly = context.Assemblies.FirstOrDefault(x => x.Id == assemblyId);
			if (request == null || assembly == null)
			{
				return false;
			}
			request.ConnectAssembly(context, assemblyId);
			context.SaveChanges();
			return true;
		}
	}
}