using EkzamenContracts.BindingModels;
using EkzamenContracts.SearchModels;
using EkzamenContracts.StoragesContract;
using EkzamenContracts.ViewModels;

namespace EkzamenDatabaseImplement
{
    public class GroupStorage : IGroupStorage
    {
        public GroupViewModel? Delete(GroupBindingModel model)
        {
            using var context = new ConfectioneryDatabase();
            var element = context.Groups.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                context.Groups.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public GroupViewModel? GetElement(GroupSearchModel model)
        {
            using var context = new ConfectioneryDatabase();
            if (!model.Id.HasValue)
            {
                return null;
            }
            return context.Groups.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?.GetViewModel;
        }

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

        public List<GroupViewModel> GetFullList()
        {
            using var context = new ConfectioneryDatabase();
            return context.Groups
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public GroupViewModel? Insert(GroupBindingModel model)
        {
            var newOrder = Group.Create(model);
            if (newOrder == null)
            {
                return null;
            }
            using var context = new ConfectioneryDatabase();
            context.Groups.Add(newOrder);
            context.SaveChanges();
            return newOrder.GetViewModel;
        }

        public GroupViewModel? Update(GroupBindingModel model)
        {
            using var context = new ConfectioneryDatabase();
            var order = context.Groups.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            context.SaveChanges();
            return order.GetViewModel;
        }
    }
}