PIbd-23-Radaev-A.V.-GiftShop/GiftShop/GiftShopFileImplement/Implements/ClientStorage.cs

using GiftShopContracts.BindingModels;
using GiftShopContracts.SearchModels;
using GiftShopContracts.StoragesContracts;
using GiftShopContracts.ViewModels;
using GiftShopFileImplement.Models;

namespace GiftShopFileImplement.Implements
{
    public class ClientStorage : IClientStorage
    {
        private readonly DataFileSingleton source;

        public ClientStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public List<ClientViewModel> GetFullList()
        {
            return source.Clients.Select(x => x.GetViewModel).ToList();
        }

        public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ClientFIO))
            {
                return new();
            }
            return source.Clients
                .Where(x => x.ClientFIO.Contains(model.ClientFIO))
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public ClientViewModel? GetElement(ClientSearchModel model)
        {
            if (model.Id.HasValue)
                return source.Clients
                    .FirstOrDefault(x => x.Id == model.Id)?
                    .GetViewModel;
            if (!string.IsNullOrEmpty(model.Email) && !string.IsNullOrEmpty(model.Password))
                return source.Clients
                    .FirstOrDefault(x => x.Email
                    .Equals(model.Email) && x.Password
                    .Equals(model.Password))?
                    .GetViewModel;
            if (!string.IsNullOrEmpty(model.Email))
                return source.Clients
                    .FirstOrDefault(x => x.Email.Equals(model.Email))?.GetViewModel;
            return null;
        }

        public ClientViewModel? Insert(ClientBindingModel model)
        {
            model.Id = source.Clients.Count > 0 ? source.Clients.Max(x => x.Id) + 1 : 1;
            var newClient = Client.Create(model);
            if (newClient == null)
            {
                return null;
            }
            source.Clients.Add(newClient);
            source.SaveClients();
            return newClient.GetViewModel;
        }

        public ClientViewModel? Update(ClientBindingModel model)
        {
            var ingredient = source.Clients.FirstOrDefault(x => x.Id == model.Id);
            if (ingredient == null)
            {
                return null;
            }
            ingredient.Update(model);
            source.SaveClients();
            return ingredient.GetViewModel;
        }

        public ClientViewModel? Delete(ClientBindingModel model)
        {
            var element = source.Clients.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                source.Clients.Remove(element);
                source.SaveClients();
                return element.GetViewModel;
            }
            return null;
        }
    }
}