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

namespace SchoolScheduleDataBaseImplement.Implements
{
	public class TeacherStorage : ITeacherStorage
	{
		public List<TeacherViewModel> GetFullList()
		{
			using var context = new SchoolScheduleDataBase();
			return context.Teachers.Include(x => x.Grade)
			.Select(x => x.GetViewModel)
		   .ToList();
		}
		public List<TeacherViewModel> GetFilteredList(TeacherSearchModel model)
		{
			using var context = new SchoolScheduleDataBase();
			return context.Teachers.Include(x => x.Grade)
			.Where(x => (!model.Id.HasValue || x.Id == model.Id) && (string.IsNullOrEmpty(model.FullName) || x.FullName == model.FullName))
		   .Select(x => x.GetViewModel)
		   .ToList();
		}
		public TeacherViewModel? GetElement(TeacherSearchModel model)
		{
			if (!model.Id.HasValue && string.IsNullOrEmpty(model.FullName))
			{
				return null;
			}
			using var context = new SchoolScheduleDataBase();
			return context.Teachers.Include(x => x.Grade)
			.FirstOrDefault(x => (!model.Id.HasValue || x.Id == model.Id) && (string.IsNullOrEmpty(model.FullName) || x.FullName == model.FullName))
			?.GetViewModel;
		}
		public TeacherViewModel? Insert(TeacherBindingModel model)
		{
			using var context = new SchoolScheduleDataBase();
			var newComponent = Teacher.Create(context, model);
			if (newComponent == null)
			{
				return null;
			}
			context.Teachers.Add(newComponent);
			context.SaveChanges();
			return newComponent.GetViewModel;
		}
		public TeacherViewModel? Update(TeacherBindingModel model)
		{
			using var context = new SchoolScheduleDataBase();
			var component = context.Teachers.FirstOrDefault(x => x.Id ==
		   model.Id);
			if (component == null)
			{
				return null;
			}
			component.Update(context, model);
			context.SaveChanges();
			return component.GetViewModel;
		}
		public TeacherViewModel? Delete(TeacherBindingModel model)
		{
			using var context = new SchoolScheduleDataBase();
			var element = context.Teachers.FirstOrDefault(rec => rec.Id ==
		   model.Id);
			if (element != null)
			{
				context.Teachers.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}
	}
}