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


namespace TravelCompanyFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton _source;
        public OrderStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }
        public List<OrderViewModel> GetFullList()
        {
            return _source.Orders
            .Select(x => InsertTravelName(x.GetViewModel))
           .ToList();
        }
        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue && !model.DateFrom.HasValue && !model.DateTo.HasValue)
            {
                return new();
            }
            if (!model.DateFrom.HasValue || !model.DateTo.HasValue)
            {
                return _source.Orders
                .Where(x => x.Id == model.Id)
                .Select(x => InsertTravelName(x.GetViewModel))
                .ToList();
            }
            else
            {
                return _source.Orders
                .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                .Select(x => InsertTravelName(x.GetViewModel))
                .ToList();
            }
            
        }
        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            return InsertTravelName(_source.Orders
            .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
            ?.GetViewModel);
        }
        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 InsertTravelName(newOrder.GetViewModel);
        }
        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 InsertTravelName(order.GetViewModel);
        }
        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 InsertTravelName(element.GetViewModel);
            }
            return null;
        }

        public OrderViewModel InsertTravelName(OrderViewModel fullModel)
        {
            string? travelName = _source.Travels.FirstOrDefault(x => x.Id == fullModel?.TravelId)?.TravelName;
            if (travelName != null) fullModel.TravelName = travelName;
            return fullModel;
        }
    }
}