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


namespace TaskTrackerDatabaseImplement.Implements
{
	public class EmployeeStorage : IEmployeeStorage
	{
		public EmployeeViewModel? Delete(EmployeeBindingModel model)
		{

			using var context = new TasktrackerContext();
			var element = context.Employees.Include(x => x.Company)
			.FirstOrDefault(rec => rec.Id == model.Id);
			if (element != null)
			{
				context.Employees.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}

		public EmployeeViewModel? GetElement(EmployeeSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}
			using var context = new TasktrackerContext();
			return context.Employees.Include(x => x.Company)
			 .FirstOrDefault(x =>
			(model.Id.HasValue && x.Id ==
			model.Id))
			?.GetViewModel;
		}

		public List<EmployeeViewModel> GetFilteredList(EmployeeSearchModel model)
		{
			if (!model.Id.HasValue && !model.CompanyId.HasValue)
			{
				return new();
			}
			using var context = new TasktrackerContext();
			return context.Employees
			  .Include(x => x.Company)
					.Where(x => x.CompanyId == model.CompanyId)
			  .Select(x => x.GetViewModel)
			  .ToList();
			
		}

		public List<EmployeeViewModel> GetFullList()
		{
			using var context = new TasktrackerContext();
			return context.Employees.Include(x => x.Company)
			.ToList()
			.Select(x => x.GetViewModel)
			.ToList();
		}

		public EmployeeViewModel? Insert(EmployeeBindingModel model)
		{
			using var context = new TasktrackerContext();
			var newProduct = Employee.Create(model);
			if (newProduct == null)
			{
				return null;
			}
			context.Employees.Add(newProduct);
			context.SaveChanges();
			return context.Employees.Include(x => x.Company).FirstOrDefault(x => x.Id == newProduct.Id)?.GetViewModel;
		}

		public EmployeeViewModel? Update(EmployeeBindingModel model)
		{
			using var context = new TasktrackerContext();

			var product = context.Employees.Include(x => x.Company).FirstOrDefault(rec =>
			rec.Id == model.Id);
			if (product == null)
			{
				return null;
			}
			product.Update(model);
			context.SaveChanges();

			return product.GetViewModel;
		}
	}
}