PIbd-23_Elatomtsev_L.K._SUBD_Device/DeviceDatabaseImplement/Implements/StaffStorage.cs

using DeviceContracts.BindingModels;
using DeviceContracts.SearchModels;
using DeviceContracts.StoragesContracts;
using DeviceContracts.ViewModels;
using DeviceDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DeviceDatabaseImplement.Implements
{
    public class StaffStorage : IStaffStorage
    {
        public List<StaffViewModel> GetFullList()
        {
            using var context = new DeviceDatabase();
            return context.Staff.Select(x => x.GetViewModel).ToList();
        }
        public List<StaffViewModel> GetFilteredList(StaffSearchModel model)
        {
            if (string.IsNullOrEmpty(model.FullName) &&
                string.IsNullOrEmpty(model.Department) &&
                string.IsNullOrEmpty(model.Email))
            {
                return new();
            }
            using var context = new DeviceDatabase();
            return context.Staff
                .Where(x => (string.IsNullOrEmpty(model.FullName) || 
                x.FullName == model.FullName) && 
                (string.IsNullOrEmpty(model.Department) || 
                x.Department == model.Department) && 
                (string.IsNullOrEmpty(model.Email) || 
                x.Email == model.Email))
                .Select(x => x.GetViewModel).ToList();
        }
        public StaffViewModel? GetElement(StaffSearchModel model)
        {
            if (string.IsNullOrEmpty(model.FullName) &&
                string.IsNullOrEmpty(model.Department) &&
                string.IsNullOrEmpty(model.Email))
            {
                return null;
            }
            using var context = new DeviceDatabase();
            return context.Staff
                .FirstOrDefault(x => (string.IsNullOrEmpty(model.FullName) || 
                x.FullName == model.FullName) && 
                (string.IsNullOrEmpty(model.Department) || 
                x.Department == model.Department) && 
                (string.IsNullOrEmpty(model.Email) || x.Email == model.Email))
                ?.GetViewModel;
        }
        public StaffViewModel? Insert(StaffBindingModel model)
        {
            var newStaff = Staff.Create(model);
            if (newStaff == null)
            {
                return null;
            }
            using var context = new DeviceDatabase();
            context.Staff.Add(newStaff);
            context.SaveChanges();
            return newStaff.GetViewModel;
        }
        public StaffViewModel? Update(StaffBindingModel model)
        {
            using var context = new DeviceDatabase();
            var staff = context.Staff
                .FirstOrDefault(x => x.Id == model.Id);
            if (staff == null)
            {
                return null;
            }
            staff.Update(model);
            context.SaveChanges();
            return staff.GetViewModel;
        }
        public StaffViewModel? Delete(StaffBindingModel model)
        {
            using var context = new DeviceDatabase();
            var element = context.Staff
                .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Staff.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}