using TravelCompanyContracts.BindingModels;
using TravelCompanyContracts.SearchModels;
using TravelCompanyContracts.StoragesContracts;
using TravelCompanyContracts.ViewModels;
using TravelCompanyFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TravelCompanyFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton source;

        public OrderStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue && !model.ImplementerId.HasValue)
            {
                return null;
            }
			var order = source.Orders.FirstOrDefault(x =>
				model.ImplementerId.HasValue && x.ImplementerId == model.ImplementerId && model.Status != null && x.Status.Equals(model.Status)
				|| model.Status == null && model.ImplementerId.HasValue && x.ImplementerId == model.ImplementerId
				|| model.Id.HasValue && x.Id == model.Id);
			return order?.GetViewModel != null ? GetViewModel(source.Orders.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)) : null;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue && !model.DateFrom.HasValue)
            {
                return new();
            }
            if (model.DateFrom.HasValue)
            {
                return source.Orders
                              .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                              .Select(x => x.GetViewModel)
                              .ToList();
            }
			else if (model.ClientId.HasValue)
			{
				return source.Orders
							  .Where(x => x.ClientId == model.ClientId)
							  .Select(x => x.GetViewModel)
							  .ToList();
			}
			else if (model.ImplementerId.HasValue)
			{
				return source.Orders
							  .Where(x => x.ImplementerId == model.ImplementerId)
							  .Select(x => x.GetViewModel)
							  .ToList();
			}
			else if (model.Status != null)
			{
				return source.Orders
							  .Where(x => x.Status.Equals(model.Status))
							  .Select(x => x.GetViewModel)
							  .ToList();
			}
			return source.Orders.Where(x => x.Id == model.Id).Select(x => GetViewModel(x)).ToList();
        }

        public List<OrderViewModel> GetFullList()
        {
            return source.Orders.Select(x => GetViewModel(x)).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 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 order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            source.SaveOrders();
            return GetViewModel(order);
        }

        private OrderViewModel GetViewModel(Order order)
        {
            var viewModel = order.GetViewModel;
            var travel = source.Travels.FirstOrDefault(x => x.Id == order.TravelId);
            viewModel.TravelName = travel?.TravelName;
            return viewModel;
        }
    }
}