using LawFirmContracts.BindingModels;
using LawFirmContracts.SearchModels;
using LawFirmContracts.StoragesContracts;
using LawFirmContracts.ViewModels;
using LawFirmFileImplement.Models;

namespace LawFirmFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton source;
        public OrderStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public List<OrderViewModel> GetFullList()
        {
            return source.Orders.Select(x => GetViewModel(x)).ToList();
        }
        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
			if (!model.Id.HasValue && model.DateFrom.HasValue && model.DateTo.HasValue)
			{
				return source.Orders
					.Where(x => model.DateFrom <= x.DateCreate.Date && x.DateCreate <= model.DateTo)
					.Select(x => x.GetViewModel)
					.ToList();
			}
			if (!model.Id.HasValue && model.ClientId.HasValue)
			{
				return source.Orders
					.Where(x => x.ClientId == model.ClientId)
					.Select(x => x.GetViewModel)
					.ToList();
			}
            if (!model.Id.HasValue && model.OrderStatus.HasValue)
            {
                return source.Orders
                    .Where(x => model.OrderStatus == x.Status)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            var result = GetElement(model);
            return result != null ? new() { result } : new();
		}
		public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            if (model.ImplementerId.HasValue && model.OrderStatus.HasValue)
            {
                return source.Orders
                    .FirstOrDefault(x => x.ImplementerId == model.ImplementerId &&
                                         model.OrderStatus == x.Status)
                    ?.GetViewModel;
            }
            if (model.ImplementerId.HasValue)
            {
                return source.Orders
                    .FirstOrDefault(x => x.ImplementerId == model.ImplementerId)
                    ?.GetViewModel;
            }
            return source.Orders.FirstOrDefault(x =>
                (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }
        private OrderViewModel GetViewModel(Order order)
        {
            var viewModel = order.GetViewModel;
            var document = source.Documents.FirstOrDefault(x => x.Id == order.DocumentId);
            if (document != null)
            {
                viewModel.DocumentName = document.DocumentName;
            }
            return viewModel;
        }
        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 GetViewModel(newOrder);
        }
        public OrderViewModel? Update(OrderBindingModel model)
        {
            var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            source.SaveOrders();
            return GetViewModel(order);
        }
        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 GetViewModel(element);
            }
            return null;
        }
    }
}