ISEbd-21_Tukaeva_A_A_School/School/SchoolDatabaseImplements/Implements/EmployeeStorage.cs

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

namespace SchoolDatabaseImplement.Implements
{
	public class EmployeeStorage : IEmployeeStorage
	{
		public List<EmployeeViewModel> GetFullList()
		{
			using var context = new SchoolDatabase();
			return context.Employees
			.Select(x => x.GetViewModel)
			.ToList();
		}
		public List<EmployeeViewModel> GetFilteredList(EmployeeSearchModel model)
		{
			if (model == null)
			{
				return null;
			}
			if (model.Id.HasValue)
			{
				var res = GetElement(model);
				return res != null ? new() { res } : new();
			}
			if (model.EmployeeName != null)
			{
				using var context = new SchoolDatabase();
				return context.Employees
				.Where(rec => rec.EmployeeName.Contains(model.EmployeeName))
				.Select(x => x.GetViewModel)
				.ToList();
			}
			return new();
		}
		public EmployeeViewModel? GetElement(EmployeeSearchModel model)
		{
			using var context = new SchoolDatabase();
			if (model.Id.HasValue)
				return context.Employees.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
			if (model.EmployeeName != null && model.EmployeePassword != null)
				return context.Employees
					.FirstOrDefault(x => x.EmployeeName.Equals(model.EmployeeName)
									  && x.EmployeePassword.Equals(model.EmployeePassword))
					?.GetViewModel;
			if (model.EmployeeName != null)
				return context.Employees.FirstOrDefault(x => x.EmployeeName.Contains(model.EmployeeName))?.GetViewModel;
			return null;
		}
		public EmployeeViewModel? Insert(EmployeeBindingModel model)
		{
			using var context = new SchoolDatabase();
			var res = Employee.Create(model);
			if (res != null)
			{
				context.Employees.Add(res);
				context.SaveChanges();
			}
			return res?.GetViewModel;
		}
		public EmployeeViewModel? Update(EmployeeBindingModel model)
		{
			using var context = new SchoolDatabase();
			var res = context.Employees.FirstOrDefault(x => x.Id == model.Id);
			res?.Update(model);
			context.SaveChanges();
			return res?.GetViewModel;
		}
		public EmployeeViewModel? Delete(EmployeeBindingModel model)
		{
			using var context = new SchoolDatabase();
			var res = context.Employees.FirstOrDefault(x => x.Id == model.Id);
			if (res != null)
			{
				context.Employees.Remove(res);
				context.SaveChanges();
			}
			return res?.GetViewModel;
		}	
	}
}