PIbd22_Kuznetsov_A.V._SewingDresses/SewingDresses/SewingDressesFileImplement/Implements/ClientStorage.cs

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

namespace SewingDressesFileImplement.Implements
{
    public class ClientStorage : IClientStorage
    {
        private readonly DataFileSingleton _source;

        public ClientStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }
        public ClientViewModel? Insert(ClientBindingModel model)
        {
            model.Id = _source.Clients.Count > 0 ? _source.Clients.Max(client => client.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 client = _source.Clients.FirstOrDefault(x => x.Id == model.Id);
            if (client == null) { return null; };
            client.Update(model);
            _source.SaveClients();
            return client.GetViewModel;
        }
        public ClientViewModel? Delete(ClientBindingModel model)
        {
            var client = _source.Clients.FirstOrDefault(client => client.Id == model.Id);
            if (client == null) { return null; }
            _source.Clients.Remove(client);
            _source.SaveClients();
            return client.GetViewModel;
        }

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

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

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