using Microsoft.EntityFrameworkCore;
using SchoolContracts.BindingModel;
using SchoolContracts.SearchModel;
using SchoolContracts.StoragesContracts;
using SchoolContracts.ViewModels;
using SchoolDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SchoolDatabaseImplement.Implements
{
	public class LessonStorage : ILessonStorage
	{
		public List<LessonViewModel> GetFullList()
		{
			using var context = new SchoolDatabase();
			return context.Lessons
				.Include (x => x.Employee)
				.Select(x => x.GetViewModel)
				.ToList();
		}
		public List<LessonViewModel> GetFilteredList(LessonSearchModel model)
		{
			using var context = new SchoolDatabase();
			return context.Lessons
			.Where(x => x.Id == model.Id)
			.Include(x => x.Employee)
			.Select(x => x.GetViewModel)
			.ToList();
		}
		public LessonViewModel? GetElement(LessonSearchModel model)
		{
			using var context = new SchoolDatabase();
			if (model.Id.HasValue)//сначала ищем по Id
			{
				return context.Lessons
					.Include(x => x.Employee)
					.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
			}
			if (!string.IsNullOrEmpty(model.LessonName))//затем по названию
			{
				return context.Lessons
					   .Include(x => x.Employee)
					.FirstOrDefault(x => x.LessonName == model.LessonName)?.GetViewModel;
			}
			return null;
		}
		public LessonViewModel? Insert(LessonBindingModel model)
		{
			using var context = new SchoolDatabase();
			var newLesson = Lesson.Create(context, model);
			if (newLesson == null)
			{
				return null;
			}
			context.Lessons.Add(newLesson);
			context.SaveChanges();
			return newLesson.GetViewModel;
		}
		public LessonViewModel? Update(LessonBindingModel model)
		{
			using var context = new SchoolDatabase();
			var lesson = context.Lessons.FirstOrDefault(x => x.Id == model.Id);
			if (lesson == null)
			{
				return null;
			}
			lesson.Update(model);
			context.SaveChanges();
			return lesson.GetViewModel;
		}
		public LessonViewModel? Delete(LessonBindingModel model)
		{
			using var context = new SchoolDatabase();
			var element = context.Lessons.FirstOrDefault(rec => rec.Id == model.Id);
			if (element != null)
			{
				context.Lessons.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}
	}
}