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

namespace SchoolScheduleDataBaseImplement.Implements
{
	public class StudentStorage : IStudentStorage
	{
		public List<StudentViewModel> GetFullList()
		{
			using var context = new SchoolScheduleDataBase();
			return context.Students.Include(x => x.Grade)
			.Select(x => x.GetViewModel)
		   .ToList();
		}
		public List<StudentViewModel> GetFilteredList(StudentSearchModel model)
		{
			using var context = new SchoolScheduleDataBase();
			return context.Students.Include(x => x.Grade)
			.Where(x => (!model.Id.HasValue || x.Id == model.Id) && (string.IsNullOrEmpty(model.FullName) || x.FullName == model.FullName) 
			&& (!model.GradeId.HasValue || x.GradeId == model.GradeId))
		   .Select(x => x.GetViewModel)
		   .ToList();
		}
		public StudentViewModel? GetElement(StudentSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}
			using var context = new SchoolScheduleDataBase();
			return context.Students.Include(x => x.Grade)
			.FirstOrDefault(x =>
			(model.Id.HasValue && x.Id == model.Id))
			?.GetViewModel;
		}
		public StudentViewModel? Insert(StudentBindingModel model)
		{
			using var context = new SchoolScheduleDataBase();
			var newComponent = Student.Create(context, model);
			if (newComponent == null)
			{
				return null;
			}
			context.Students.Add(newComponent);
			context.SaveChanges();
			return newComponent.GetViewModel;
		}
		public StudentViewModel? Update(StudentBindingModel model)
		{
			using var context = new SchoolScheduleDataBase();
			using var transaction = context.Database.BeginTransaction();
			try
			{
				var component = context.Students.FirstOrDefault(x => x.Id ==
		   model.Id);
				if (component == null)
				{
					return null;
				}
				if (component == null)
				{
					return null;
				}
				component.Update(context, model);
				context.SaveChanges();
				component.UpdateAttendance(context, model);
				transaction.Commit();
				return component.GetViewModel;
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}
		public StudentViewModel? Delete(StudentBindingModel model)
		{
			using var context = new SchoolScheduleDataBase();
			var element = context.Students.FirstOrDefault(rec => rec.Id ==
		   model.Id);
			if (element != null)
			{
				context.Students.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}

	}
}