Coursach/Course/DatabaseImplement/Implements/GuarantorStorage.cs

using Contracts.BindingModels;
using Contracts.SearchModels;
using Contracts.StoragesContracts;
using Contracts.ViewModels;
using DatabaseImplement.Models;

namespace DatabaseImplement.Implements
{
	public class GuarantorStorage : IGuarantorStorage
	{
		public GuarantorViewModel? Delete(GuarantorBindingModel model)
		{
			using var context = new FactoryGoWorkDatabase();
			var newGuarantor = context.Guarantors.FirstOrDefault(x => x.Id == model.Id);
			if (newGuarantor == null)
				return null;
			context.Guarantors.Remove(newGuarantor);
			context.SaveChanges();
			return newGuarantor.GetViewModel;
		}

		public GuarantorViewModel? GetElement(GuarantorSearchModel model)
		{
			if (!model.Id.HasValue && string.IsNullOrEmpty(model.Login)) { return null; }
			using var context = new FactoryGoWorkDatabase();
			return context.Guarantors.FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id) || (!string.IsNullOrEmpty(model.Login) && x.Login.Equals(model.Login)))?.GetViewModel; ;
		}

		public List<GuarantorViewModel> GetFilteredList(GuarantorSearchModel model)
		{
			if (!model.Id.HasValue && string.IsNullOrEmpty(model.Login))
				return new();
			using var context = new FactoryGoWorkDatabase();
			if (model.Id.HasValue)
			{
				return context.Guarantors.Where(x => x.Id == model.Id).Select(x => x.GetViewModel).ToList();
			}
			else
			{
				return context.Guarantors.Where(x => x.Login.Equals(model.Login)).Select(x => x.GetViewModel).ToList();
			}
		}

		public List<GuarantorViewModel> GetFullList()
		{
			using var context = new FactoryGoWorkDatabase();
			return context.Guarantors.Select(x => x.GetViewModel).ToList();
		}

		public GuarantorViewModel? Insert(GuarantorBindingModel model)
		{
			using var context = new FactoryGoWorkDatabase();
			var newGuarantor = Guarantor.Create(model);
			if (newGuarantor == null)
				return null;
			context.Guarantors.Add(newGuarantor);
			context.SaveChanges();
			return newGuarantor.GetViewModel;
		}

		public GuarantorViewModel? Update(GuarantorBindingModel model)
		{
			using var context = new FactoryGoWorkDatabase();
			var newGuarantor = context.Guarantors.FirstOrDefault(x => x.Id == model.Id);
			if (newGuarantor == null)
				return null;
			newGuarantor.Update(model);
			context.SaveChanges();
			return newGuarantor.GetViewModel;
		}
	}
}