Romanov_E.V._CourseWork_VeterinaryClinic/VeterinaryClinicDatabaseImplement/Implements/MedicineStorage.cs

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using VeterinaryClinicContracts.BindingModels;
using VeterinaryClinicContracts.SearchModels;
using VeterinaryClinicContracts.StorageContracts;
using VeterinaryClinicContracts.ViewModels;
using VeterinaryClinicDatabaseImplement.Models;

namespace VeterinaryClinicDatabaseImplement.Implements
{
    public class MedicineStorage : IMedicineStorage
    {
        public MedicineViewModel? Delete(MedicineBindingModel model)
        {
            using var context = new VeterinaryClinicDatabase();
            var element = context.Medicines
            .Include(x => x.Medications)
            .Include(x => x.Orders)
            .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Medicines.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;

        }

        public MedicineViewModel? GetElement(MedicineSearchModel model)
        {
            if (string.IsNullOrEmpty(model.MedicineName) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new VeterinaryClinicDatabase();
            return context.Medicines
             .Include(x => x.Medications)
             .ThenInclude(x => x.Medication)
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.MedicineName) &&
            x.MedicineName == model.MedicineName) || (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }

        public List<MedicineViewModel> GetFilteredList(MedicineSearchModel model)
        {
            if (string.IsNullOrEmpty(model.MedicineName))
            {
                return new();
            }
            using var context = new VeterinaryClinicDatabase();
            return context.Medicines
             .Include(x => x.Medications)
            .ThenInclude(x => x.Medication)
            .Where(x => x.MedicineName.Contains(model.MedicineName))
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public List<MedicineViewModel> GetFullList()
        {
            using var context = new VeterinaryClinicDatabase();
            return context.Medicines
             .Include(x => x.Medications)
             .ThenInclude(x => x.Medication)
             .ToList()
             .Select(x => x.GetViewModel)
             .ToList();
        }

        public MedicineViewModel? Insert(MedicineBindingModel model)
        {
            using var context = new VeterinaryClinicDatabase();
            var newMedicine = Medicine.Create(context, model);
            if (newMedicine == null)
            {
                return null;
            }
            context.Medicines.Add(newMedicine);
            context.SaveChanges();
            return newMedicine.GetViewModel;
        }

        public MedicineViewModel? Update(MedicineBindingModel model)
        {
            using var context = new VeterinaryClinicDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var Medicine = context.Medicines.FirstOrDefault(rec =>
                rec.Id == model.Id);
                if (Medicine == null)
                {
                    return null;
                }
                Medicine.Update(model);
                context.SaveChanges();
                Medicine.UpdateMedications(context, model);
                transaction.Commit();
                return Medicine.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
    }
}