CourseWork_KPO/CandidateReviewDatabaseImplement/Implements/CriterionStorage.cs

using CandidateReviewContracts.BindingModels;
using CandidateReviewContracts.SearchModels;
using CandidateReviewContracts.StoragesContracts;
using CandidateReviewContracts.ViewModels;
using CandidateReviewDatabaseImplement.Models;

namespace CandidateReviewDatabaseImplement.Implements
{
    public class CriterionStorage : ICriterionStorage
    {
        public List<CriterionViewModel> GetFullList()
        {
            using var context = new CandidateReviewDatabase();
            return context.Criterions
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public List<CriterionViewModel> GetFilteredList(CriterionSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name))
            {
                return new();
            }
            using var context = new CandidateReviewDatabase();
            return context.Criterions
                .Where(x => x.Name.Contains(model.Name))
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public CriterionViewModel? GetElement(CriterionSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new CandidateReviewDatabase();
            return context.Criterions
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Name) && x.Name == model.Name) || (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }
        public CriterionViewModel? Insert(CriterionBindingModel model)
        {
            var newCriterion = Criterion.Create(model);
            if (newCriterion == null)
            {
                return null;
            }
            using var context = new CandidateReviewDatabase();
            context.Criterions.Add(newCriterion);
            context.SaveChanges();
            return newCriterion.GetViewModel;
        }
        public CriterionViewModel? Update(CriterionBindingModel model)
        {
            using var context = new CandidateReviewDatabase();
            var criterion = context.Criterions.FirstOrDefault(x => x.Id == model.Id);
            if (criterion == null)
            {
                return null;
            }
            criterion.Update(model);
            context.SaveChanges();
            return criterion.GetViewModel;
        }
        public CriterionViewModel? Delete(CriterionBindingModel model)
        {
            using var context = new CandidateReviewDatabase();
            var element = context.Criterions.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Criterions.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}