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

namespace ConfectioneryFileImplement
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton _source;
        public OrderStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }

        public OrderViewModel? Delete(OrderBindingModel model)
        {
            var element = _source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                _source.Orders.Remove(element);
                _source.SaveOrders();
                return element.GetViewModel;
            }
            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            return _source.Orders.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?.GetViewModel;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            var result = GetElement(model);
            return result != null ? new() { result } : new();
        }

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

        public OrderViewModel? Insert(OrderBindingModel model)
        {
            model.Id = _source.Orders.Count > 0 ? _source.Orders.Max(x => x.Id) + 1 : 1;
            var newOrder = Order.Create(model);
            if (newOrder == null)
            {
                return null;
            }
            _source.Orders.Add(newOrder);
            _source.SaveOrders();
            return newOrder.GetViewModel;
        }

        public OrderViewModel? Update(OrderBindingModel model)
        {
            var pastry = _source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (pastry == null)
            {
                return null;
            }
            pastry.Update(model);
            _source.SaveOrders();
            return pastry.GetViewModel;
        }
    }
}