using AircraftPlantContracts.BindingModels;
using AircraftPlantContracts.SearchModels;
using AircraftPlantContracts.StoragesContracts;
using AircraftPlantContracts.ViewModels;
using AircraftPlantDataModels.Models;
using AircraftPlantFileImplement;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace AircraftPlantFileImplement
{
    public class ShopStorage : IShopStorage
    {
        private readonly DataFileSingleton _source;
        public ShopStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }
        public List<ShopViewModel> GetFullList()
        {
            return _source.Shops
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public List<ShopViewModel> GetFilteredList(ShopSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ShopName))
            {
                return new();
            }

            return _source.Shops
                .Where(x => x.ShopName.Contains(model.ShopName))
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public ShopViewModel? GetElement(ShopSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ShopName) && !model.Id.HasValue)
            {
                return null;
            }

            return _source.Shops
                .FirstOrDefault(x =>
                    (!string.IsNullOrEmpty(model.ShopName) &&
                    x.ShopName == model.ShopName) ||
                    (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }
        public ShopViewModel? Insert(ShopBindingModel model)
        {
            model.Id = _source.Shops.Count > 0 ? _source.Shops.Max(x => x.Id) + 1 : 1;

            var newShop = Shop.Create(model);
            if (newShop == null)
            {
                return null;
            }

            _source.Shops.Add(newShop);
            _source.SaveShops();
            return newShop.GetViewModel;
        }
        public ShopViewModel? Update(ShopBindingModel model)
        {
            var shop = _source.Shops.FirstOrDefault(x => x.Id == model.Id);
            if (shop == null)
            {
                return null;
            }

            shop.Update(model);
            _source.SaveShops();
            return shop.GetViewModel;
        }
        public ShopViewModel? Delete(ShopBindingModel model)
        {
            var element = _source.Shops.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                _source.Shops.Remove(element);
                _source.SaveShops();
                return element.GetViewModel;
            }
            return null;
        }
        public bool SellPlanes(IPlaneModel model, int count)
        {
            var plane = _source.Planes.FirstOrDefault(x => x.Id == model.Id);
            if (plane == null || !CheckCount(model, count))
            {
                return false;
            }

            foreach (var shop in _source.Shops)
            {
                var planes = shop.ShopPlanes;
                foreach (var elem in planes.Where(x => x.Value.Item1.Id == plane.Id))
                {
                    var selling = Math.Min(elem.Value.Item2, count);
                    planes[elem.Value.Item1.Id] = (elem.Value.Item1, elem.Value.Item2 - selling);
                    count -= selling;

                    if (count <= 0)
                    {
                        break;
                    }
                }

                shop.Update(new ShopBindingModel
                {
                    Id = model.Id,
                    ShopName = shop.ShopName,
                    Address = shop.Address,
                    DateOpening = shop.DateOpening,
                    ShopPlanes = planes,
                    MaxPlanes = shop.MaxPlanes
                });
            }

            _source.SaveShops();
            return true;
        }
        public bool CheckCount(IPlaneModel model, int count)
        {
            int store = _source.Shops
                .Select(x => x.ShopPlanes
                    .Select(y => (y.Value.Item1.Id == model.Id ? y.Value.Item2 : 0))
                .Sum()).Sum();
            return store >= count;
        }
    }
}