using Microsoft.Extensions.Logging;
using GiftShopContracts.BindingModels;
using GiftShopContracts.BusinessLogicsContracts;
using GiftShopContracts.SearchModels;
using GiftShopContracts.StoragesContracts;
using GiftShopContracts.ViewModels;
using GiftShopDataModels.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GiftShopBusinessLogic.BusinessLogics
{
    public class ShopLogic: IShopLogic
    {
        private readonly ILogger _logger;
        private readonly IShopStorage _ShopStorage;
        public ShopLogic(ILogger<ShopLogic> logger, IShopStorage ShopStorage)
        {
            _logger = logger;
            _ShopStorage = ShopStorage;
        }
        public bool AddGift(ShopSearchModel model, IGiftModel gift, int quantity)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            if (quantity <= 0)
            {
                throw new ArgumentException("Количество добавляемого изделия должно быть больше 0", nameof(quantity));
            }

            _logger.LogInformation("AddGiftInShop. ShopName:{ShopName}.Id:{Id}", model.ShopName, model.Id);
            var element = _ShopStorage.GetElement(model);

            if (element == null)
            {
                _logger.LogWarning("AddGiftInShop element not found");
                return false;
            }
			if (element.MaxCapacity - element.ShopGifts.Select(x => x.Value.Item2).Sum() < quantity)
			{
				throw new ArgumentNullException("Магазин переполнен", nameof(quantity));
			}

			_logger.LogInformation("AddGiftInShop find. Id:{Id}", element.Id);

            if (element.ShopGifts.TryGetValue(gift.Id, out var pair))
            {
                element.ShopGifts[gift.Id] = (gift, quantity + pair.Item2);
                _logger.LogInformation("AddGiftInShop. Has been added {quantity} {gift} in {ShopName}", quantity, gift.GiftName, element.ShopName);
            }
            else
            {
                element.ShopGifts[gift.Id] = (gift, quantity);
                _logger.LogInformation("AddGiftInShop. Has been added {quantity} new gift {gift} in {ShopName}", quantity, gift.GiftName, element.ShopName);
            }

            _ShopStorage.Update(new()
            {
                Id = element.Id,
                ShopAdress = element.ShopAdress,
                ShopName = element.ShopName,
                OpeningDate = element.OpeningDate,
                ShopGifts = element.ShopGifts
            });
            return true;
        }

        public bool Create(ShopBindingModel model)
        {
            CheckModel(model);
            model.ShopGifts = new();

            if (_ShopStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }

            return true;
        }

        public bool Delete(ShopBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id:{Id}", model.Id);

            if (_ShopStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }

            return true;
        }
		//2
		public bool MakeSell(IGiftModel gift, int count)
		{
			return _ShopStorage.SellGifts(gift, count);
		}

		public ShopViewModel? ReadElement(ShopSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            _logger.LogInformation("ReadElement. ShopName:{ShopName}.Id:{ Id}", model.ShopName, model.Id);
            var element = _ShopStorage.GetElement(model);

            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }

            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
            return element;
        }

        public List<ShopViewModel>? ReadList(ShopSearchModel? model)
        {
            _logger.LogInformation("ReadList. ShopName:{ShopName}.Id:{ Id} ", model?.ShopName, model?.Id);

            var list = (model == null) ? _ShopStorage.GetFullList() : _ShopStorage.GetFilteredList(model);

            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }

            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }
        public bool MakeSupply(ShopSearchModel model, IGiftModel gift, int count)
        {

            if (model == null)
                throw new ArgumentNullException(nameof(model));
            if (gift == null)
                throw new ArgumentNullException(nameof(gift));
            if (count <= 0)
                throw new ArgumentNullException("Количество должно быть положительным числом");

            ShopViewModel curModel = _ShopStorage.GetElement(model);
            if (curModel == null)
                throw new ArgumentNullException(nameof(curModel));
            var countItems = curModel.ShopGifts.Select(x => x.Value.Item2).Sum();
            if (curModel.MaxCapacity - countItems >= count)
            {
                if (curModel.ShopGifts.TryGetValue(gift.Id, out var sameDocument))
                {
                    curModel.ShopGifts[gift.Id] = (gift, sameDocument.Item2 + count);
                    _logger.LogInformation("Same gift found by supply. Added {0} of {1} in {2} shop", count, gift.GiftName, curModel.ShopName);
                }
                else
                {
                    curModel.ShopGifts[gift.Id] = (gift, count);
                    _logger.LogInformation("New gift added by supply. Added {0} of {1} in {2} shop", count, gift.GiftName, curModel.ShopName);
                }
                _ShopStorage.Update(new()
                {
                    Id = curModel.Id,
                    ShopName = curModel.ShopName,
                    ShopAdress = curModel.ShopAdress,
                    OpeningDate = curModel.OpeningDate,
                    ShopGifts = curModel.ShopGifts,
                    MaxCapacity = curModel.MaxCapacity
                });
            }
            else
            {
                _logger.LogWarning("Required shop is overflowed");
                return false;
            }
            return true;
        }
        
        public bool Update(ShopBindingModel model)
        {
            CheckModel(model, false);

            if (string.IsNullOrEmpty(model.ShopName))
            {
                throw new ArgumentNullException("Нет названия магазина", nameof(model.ShopName));
            }

            if (_ShopStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(ShopBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            if (!withParams)
            {
                return;
            }

            if (string.IsNullOrEmpty(model.ShopName))
            {
                throw new ArgumentNullException("Нет названия магазина", nameof(model.ShopName));
            }

            _logger.LogInformation("Shop. ShopName:{0}.ShopAddress:{1}. Id: {2}", model.ShopName, model.ShopAdress, model.Id);
            var element = _ShopStorage.GetElement(new ShopSearchModel
            {
                ShopName = model.ShopName
            });

            if (element != null && element.Id != model.Id && element.ShopName == model.ShopName)
            {
                throw new InvalidOperationException("Магазин с таким названием уже есть");
            }
        }
    }
}