using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContract;
using ConfectioneryContracts.ViewModels;

namespace ConfectioneryListImplement
{
    public class ClientStorage : IClientStorage
    {
        private readonly DataListSingleton _source;
        public ClientStorage()
        {
            _source = DataListSingleton.GetInstance();
        }

        public ClientViewModel? Delete(ClientBindingModel model)
		{
			for (int i = 0; i < _source.Clients.Count; ++i)
			{
				if (_source.Clients[i].Id == model.Id)
				{
					var element = _source.Clients[i];
					_source.Clients.RemoveAt(i);
					return element.GetViewModel;
				}
			}
			return null;
		}

		public ClientViewModel? GetElement(ClientSearchModel model)
        {
            foreach (var client in _source.Clients)
            {
				if (model.Id.HasValue && model.Id == client.Id)
					return client.GetViewModel;
				if (model.Email != null && model.Password != null && 
                    client.Email.Equals(model.Email) && client.Password.Equals(model.Password))
					return client.GetViewModel;
				if (model.Email != null && client.Email.Equals(model.Email))
					return client.GetViewModel;
			}
            return null;
        }

        public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
        {
            if (model == null)
            {
                return new();
            }
            // У нас нет каких либо специфических условий для выборки списка клиентов,
			// поэтому получаем лишь один элемент по модели
            var res = GetElement(model);
            return res != null ? new() { res } : new();
        }

        public List<ClientViewModel> GetFullList()
        {
			var result = new List<ClientViewModel>();
			foreach (var client in _source.Clients)
			{
				result.Add(client.GetViewModel);
			}
			return result;
		}

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

        public ClientViewModel? Update(ClientBindingModel model)
		{
			foreach (var client in _source.Clients)
			{
				if (client.Id == model.Id)
				{
					client.Update(model);
					return client.GetViewModel;
				}
			}
			return null;
		}
	}
}