using BeautySaloonContracts.BindingModels;
using BeautySaloonContracts.SearchModels;
using BeautySaloonContracts.StoragesContracts;
using BeautySaloonContracts.ViewModels;

namespace BeautySaloonDatabaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new NewdbContext();
            var element = context.Orders
                .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Orders.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            using var context = new NewdbContext();
            if (model.Id.HasValue)
                return context.Orders
                    .FirstOrDefault(x => x.Id == model.Id)?
                    .GetViewModel;
            return null;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            using var context = new NewdbContext();
            if (model.ClientId.HasValue)
                return context.Orders
                    .Where(x => x.ClientId == model.ClientId)
                    .Select(x => x.GetViewModel)
                    .ToList();
            if (model.EmployeeId.HasValue)
                return context.Orders
                    .Where(x => x.EmployeeId == model.EmployeeId)
                    .Select(x => x.GetViewModel)
                    .ToList();
            if (model.Date.HasValue)
                return context.Orders
                    .Where(x => x.Date == model.Date)
                    .Select(x => x.GetViewModel)
                    .ToList();
            return new();
        }

        public List<OrderViewModel> GetFullList()
        {
            using var context = new NewdbContext();
            return context.Orders
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

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

        public OrderViewModel? Update(OrderBindingModel model)
        {
            using var context = new NewdbContext();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var order = context.Orders.FirstOrDefault(rec => rec.Id == model.Id);
                if (order == null)
                {
                    return null;
                }
                order.Update(model);
                context.SaveChanges();
                order.UpdateServices(context, model);
                transaction.Commit();
                return order.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
    }
}