using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContracts;
using ConfectioneryContracts.ViewModels;
using ConfectioneryFileImplement.Models;
namespace ConfectioneryFileImplement.Implements
{
    public class PastryStorage : IPastryStorage
    {
        private readonly DataFileSingleton source;
        public PastryStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public List<PastryViewModel> GetFullList()
        {
            return source.Pastries
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<PastryViewModel> GetFilteredList(PastrySearchModel model)
        {
            if (string.IsNullOrEmpty(model.PastryName))
            {
                return new();
            }
            return source.Pastries
                .Where(x => x.PastryName.Contains(model.PastryName))
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public PastryViewModel? GetElement(PastrySearchModel model)
        {
            if (string.IsNullOrEmpty(model.PastryName) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Pastries.FirstOrDefault(x => (!string.IsNullOrEmpty(
                model.PastryName) && x.PastryName == model.PastryName) || 
                (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }
        public PastryViewModel? Insert(PastryBindingModel model)
        {
            model.Id = source.Pastries.Count > 0 ? 
                source.Pastries.Max(x => x.Id) + 1 : 1;
            var newPastry = Pastry.Create(model);
            if (newPastry == null)
            {
                return null;
            }
            source.Pastries.Add(newPastry);
            source.SavePastries();
            return newPastry.GetViewModel;
        }
        public PastryViewModel? Update(PastryBindingModel model)
        {
            var Pastry = source.Pastries.FirstOrDefault(x => x.Id == model.Id);
            if (Pastry == null)
            {
                return null;
            }
            Pastry.Update(model);
            source.SavePastries();
            return Pastry.GetViewModel;
        }
        public PastryViewModel? Delete(PastryBindingModel model)
        {
            var Pastry = source.Pastries.FirstOrDefault(x => x.Id == model.Id);
            if (Pastry != null)
            {
                source.Pastries.Remove(Pastry);
                source.SavePastries();
                return Pastry.GetViewModel;
            }
            return null;
        }
    }
}