using Contracts.BindingModel;
using Contracts.SearchModel;
using Contracts.StorageContracts;
using Contracts.ViewModel;
using DatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplement.Implements
{
    public class DisciplineStorage : IDisciplineStorage
    {
        public List<DisciplineViewModel> GetFullList()
        {
            using var context = new ElegevContext();

            return context.Disciplines
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public DisciplineViewModel? GetElement(DisciplineSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            using var context = new ElegevContext();

            return context.Disciplines
                .FirstOrDefault(x =>(model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        public DisciplineViewModel? Insert(DisciplineBindingModel model)
        {
            var newDiscipline = Discipline.Create(model);

            if (newDiscipline == null)
            {
                return null;
            }

            using var context = new ElegevContext();

            context.Disciplines.Add(newDiscipline);
            context.SaveChanges();

            return newDiscipline.GetViewModel;
        }

        public DisciplineViewModel? Update(DisciplineBindingModel model)
        {
            using var context = new ElegevContext();

            var discipline = context.Disciplines
                .FirstOrDefault(x => x.Id == model.Id);

            if (discipline == null)
            {
                return null;
            }

            discipline.Update(model);
            context.SaveChanges();

            return discipline.GetViewModel;
        }

        public DisciplineViewModel? Delete(DisciplineBindingModel model)
        {
            using var context = new ElegevContext();

            var element = context.Disciplines
                .FirstOrDefault(rec => rec.Id == model.Id);

            if (element != null)
            {
                context.Disciplines.Remove(element);
                context.SaveChanges();

                return element.GetViewModel;
            }

            return null;
        }
    }
}