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

namespace PersonnelDepartmentDatabaseImplement.Implements
{
	public class DealStorage : IDealStorage
	{
		public DealViewModel? Delete(DealBindingModel model)
		{
			using var context = new PersonnelDepartmentDatabase();
			var element = context.Deals
				.FirstOrDefault(x => x.Id == model.Id);
			if (element == null)
			{
				return null;
			}
			context.Deals.Remove(element);
			return element.GetViewModel;
		}

		public DealViewModel? GetElement(DealSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}
			using var context = new PersonnelDepartmentDatabase();
			return context.Deals
				.Include(x => x.Employee)
				.Include(x => x.Department)
				.Include(x => x.Type)
				.Include(x => x.Employee)
				.FirstOrDefault(x => (model.Id.HasValue && model.Id == x.Id) ||
				(model.DateFrom != null && x.DateFrom == model.DateFrom) ||
				(model.DateTo != null && x.DateTo == model.DateTo) ||
				(model.EmployeeId.HasValue && x.EmployeeId == model.EmployeeId) ||
				(model.DepartmentId.HasValue && x.DepartmentId == model.DepartmentId) ||
				(model.PositionId.HasValue && x.PositionId == model.PositionId) ||
				(model.TypeId.HasValue && x.TypeId == model.TypeId))?.GetViewModel;
		}

		public List<DealViewModel> GetFilteredList(DealSearchModel model)
		{
			using var context = new PersonnelDepartmentDatabase();
			return context.Deals
				.Include(x => x.Employee)
				.Include(x => x.Department)
				.Include(x => x.Type)
				.Include(x => x.Employee)
				.Where(x => (model.Id.HasValue && model.Id == x.Id) ||
				(model.DateFrom != null && x.DateFrom == model.DateFrom) ||
				(model.DateTo != null && x.DateTo == model.DateTo) ||
				(model.EmployeeId.HasValue && x.EmployeeId == model.EmployeeId) ||
				(model.DepartmentId.HasValue && x.DepartmentId == model.DepartmentId) ||
				(model.PositionId.HasValue && x.PositionId == model.PositionId) ||
				(model.TypeId.HasValue && x.TypeId == model.TypeId))
				.Select(x => x.GetViewModel) .ToList();
		}

		public List<DealViewModel> GetFullList()
		{
			using var context = new PersonnelDepartmentDatabase();
			return context.Deals
				.Include(x => x.Department)
				.Include(x => x.Position)
				.Include(x => x.Employee)
				.Include(x => x.Type)
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public DealViewModel? Insert(DealBindingModel model)
		{
			var newElement = Deal.Create(model);
			if (newElement == null)
			{
				return null;
			}
			using var context = new PersonnelDepartmentDatabase();
			context.Deals.Add(newElement);
			context.SaveChanges();
			return newElement.GetViewModel;
		}

		public DealViewModel? Update(DealBindingModel model)
		{
			using var context = new PersonnelDepartmentDatabase();
			var element = context.Deals
				.Include(x => x.Department)
				.Include(x => x.Employee)
				.Include(x => x.Type)
				.Include (x => x.Position)
				.FirstOrDefault(x => x.Id == model.Id);
			if (element == null)
			{
				return null;
			}
			element.Update(model);
			context.SaveChanges();
			return element.GetViewModel;
		}
	}
}