PIbd-21_KozyrevSS_SewingDresses_Base/SewingDresses/SewingDressesFileImplement/Implements/DressStorage.cs

using SewingDressesContracts.BindingModels;
using SewingDressesContracts.SearchModels;
using SewingDressesContracts.StoragesContracts;
using SewingDressesContracts.ViewModels;
using SewingDressesDataModels.Models;
using SewingDressesFileImplement.Models;


namespace SewingDressesFileImplement.Implements
{
    public class DressStorage : IDressStorage
    {
        private readonly DataFileSingleton source;
        public DressStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public List<DressViewModel> GetFullList()
        {
            return source.Dresses.Select(x => x.GetViewModel).ToList();
        }
        public List<DressViewModel> GetFilteredList(DressSearchModel model)
        {
            return source.Dresses.Where(x => x.Id == model.Id)
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public DressViewModel? GetElement(DressSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            return source.Dresses.FirstOrDefault(x => (!string.IsNullOrEmpty(model.DressName) && x.DressName == model.DressName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }
        public DressViewModel? Insert(DressBindingModel model)
        {
            model.Id = source.Dresses.Count > 0 ? source.Dresses.Max(x => x.Id) + 1 : 1;
            var newDress = Dress.Create(model);
            if (newDress == null)
            {
                return null;
            }
            source.Dresses.Add(newDress);
            source.SaveDresses();
            return newDress.GetViewModel;
        }
        public DressViewModel? Update(DressBindingModel model)
        {
            var component = source.Dresses.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            source.SaveDresses();
            return component.GetViewModel;
        }
        public DressViewModel? Delete(DressBindingModel model)
        {
            var component = source.Dresses.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            source.Dresses.Remove(component);
            source.SaveDresses();
            return component.GetViewModel;
        }
    }
}