PIbd-21_CourseWork_Polyclinic_BeSick/Polyclinic/PolyclinicDatabaseImplement/Implements/CourseStorage.cs

using Microsoft.EntityFrameworkCore;
using PolyclinicContracts.BindingModels;
using PolyclinicContracts.SearchModels;
using PolyclinicContracts.StoragesContracts;
using PolyclinicContracts.ViewModels;
using PolyclinicDatabaseImplement.Models;
using SecuritySystemDatabaseImplement;

namespace PolyclinicDatabaseImplement.Implements
{
    public class CourseStorage : ICourseStorage
    {
        public CourseViewModel? Delete(CourseBindingModel model)
        {
            using var context = new PolyclinicDatabase();
            var element = context.Courses.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Courses.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public CourseViewModel? GetElement(CourseSearchModel model)
        {
            return GetFilteredList(model).FirstOrDefault();
        }

        public List<CourseViewModel> GetFilteredList(CourseSearchModel model)
        {
            var elements = GetFullList();
            if (model.Id != null)
            {
                elements = elements.Where(x => x.Id == model.Id).ToList();
            }
            return elements;
        }

        public List<CourseViewModel> GetFullList()
        {
            using var context = new PolyclinicDatabase();
            return context.Courses
                .Include(x => x.Diagnoses)
                .ThenInclude(x => x.Diagnose)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public CourseViewModel? Insert(CourseBindingModel model)
        {
            using var context = new PolyclinicDatabase();
            var element = Course.Create(context, model);
            if (element == null)
            {
                return null;
            }
            context.Courses.Add(element);
            context.SaveChanges();
            return element.GetViewModel;
        }

        public CourseViewModel? Update(CourseBindingModel model)
        {
            using var context = new PolyclinicDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var element = context.Courses.FirstOrDefault(x => x.Id == model.Id);
                if (element == null)
                {
                    return null;
                }
                element.Update(model);
                context.SaveChanges();
                element.UpdateDiagnoses(context, model);
                transaction.Commit();
                return element.GetViewModel;
            }
            catch (Exception ex)
            {
                transaction.Rollback();
                throw;
            }
        }
    }
}