using Microsoft.Extensions.Logging;
using SushiBarContracts.BindingModels;
using SushiBarContracts.BusinessLogicsContracts;
using SushiBarContracts.SearchModels;
using SushiBarContracts.StoragesContracts;
using SushiBarContracts.ViewModels;
using SushiBarDataModels.Models;

namespace SushiBarBusinessLogic.BusinessLogics
{
    public class StoreLogic : IStoreLogic
    {
        private readonly ILogger _logger;
        private readonly IStoreStorage _storeStorage;

        public StoreLogic(ILogger<StoreLogic> logger, IStoreStorage storeStorage)
        {
            _logger = logger;
            _storeStorage = storeStorage;
        }

        public bool AddPackage(StoreSearchModel model, ISushiModel sushi, int quantity)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            if (quantity <= 0)
            {
                throw new ArgumentException("Quantity must be more then zero", nameof(quantity));
            }

            _logger.LogInformation("AddPackageInStore. StoreName:{StoreName}.Id:{ Id}", model.StoreName, model.Id);

            var element = _storeStorage.GetElement(model);

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

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

            if (element.Sushis.TryGetValue(sushi.Id, out var pair))
            {
                element.Sushis[sushi.Id] = (sushi, quantity + pair.Item2);
                _logger.LogInformation("AddPackageInStore. Has been added {quantity} {package} in {StoreName}", quantity, sushi.SushiName, element.StoreName);
            }
            else
            {
                element.Sushis[sushi.Id] = (sushi, quantity);
                _logger.LogInformation("AddPastryInShop. Has been added {quantity} new Package {package} in {StoreName}", quantity, sushi.SushiName, element.StoreName);
            }

            _storeStorage.Update(new()
            {
                Id = element.Id,
                StoreAddress = element.StoreAddress,
                StoreName = element.StoreName,
                OpeningDate = element.OpeningDate,
                Sushis = element.Sushis,
                maxSushi = element.maxSushi
            });
            return true;
        }

        public bool Create(StoreBindingModel model)
        {
            CheckModel(model);
            model.Sushis = new();

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

            return true;
        }

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

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

            return true;
        }

        public bool SupplySushi(StoreSearchModel model, ISushiModel sushi, int quantity)
        {
            if (model == null || sushi == null || quantity <= 0)
            {
                throw new ArgumentNullException();
            }

            var store = _storeStorage.GetElement(model);
            if (store == null)
            {
                _logger.LogWarning("Required store element not found in storage");
                return false;
            }
            
            _logger.LogInformation("Shop element found. ID: {0}, Name: {1}", store.Id, store.StoreName);
            int countSushi = store.Sushis.Sum(s => s.Value.Item2);
            if (store.maxSushi - countSushi >= quantity)
            {
                if (store.Sushis.TryGetValue(sushi.Id, out var pair))
                {
                    store.Sushis[sushi.Id] = (sushi, quantity + pair.Item2);
                    _logger.LogInformation("AddPackageInStore. Has been added {quantity} {package} in {StoreName}", quantity, sushi.SushiName, store.StoreName);
                }
                else
                {
                    store.Sushis[sushi.Id] = (sushi, quantity);
                    _logger.LogInformation("AddPastryInShop. Has been added {quantity} new Package {package} in {StoreName}", quantity, sushi.SushiName, store.StoreName);
                }

                _storeStorage.Update(new()
                {
                    Id = store.Id,
                    StoreAddress = store.StoreAddress,
                    StoreName = store.StoreName,
                    OpeningDate = store.OpeningDate,
                    Sushis = store.Sushis,
                    maxSushi = store.maxSushi
                });
            }
            else
            {
                _logger.LogWarning("Required shop is overflowed");
                return false;
            }
            return true;
        }

        public bool CheckToSupply(ISushiModel sushi, int quantity)
        {
            if (quantity <= 0)
            {
                _logger.LogWarning("Check then supply operation error. Document count < 0.");
                return false;
            }

            int countSushi = 0;
            foreach (var store in _storeStorage.GetFullList())
            {
                countSushi += store.maxSushi;
                countSushi = store.Sushis.Values.Aggregate(countSushi, (current, valueTuple) => current - valueTuple.Item2);
            }

            if (countSushi - quantity < 0)
            {
                _logger.LogWarning("Check then supply operation error. There's no place for new docs in stores.");
                return false;
            }

            foreach (var store in _storeStorage.GetFullList())
            {
                countSushi = store.Sushis.Values.Aggregate(store.maxSushi, (current, valueTuple) => current - valueTuple.Item2);
                if (countSushi == 0)
                {
                    continue;
                }

                if (countSushi - quantity >= 0)
                {
                    if (SupplySushi(new() { Id = store.Id }, sushi, countSushi))
                        countSushi = 0;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (countSushi - quantity < 0)
                {
                    if (SupplySushi(new StoreSearchModel { Id = store.Id }, sushi, countSushi)) 
                        quantity -= countSushi;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (countSushi <= 0)
                {
                    return true;
                }
            }

            return false;
        }

        public bool SellSushi(ISushiModel model, int quantity)
        {
            return _storeStorage.SellSushi(model, quantity);
        }

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

            _logger.LogInformation("ReadElement. StoreName:{StoreName}.Id:{ Id}", model.StoreName, model.Id);
            var element = _storeStorage.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<StoreViewModel>? ReadList(StoreSearchModel? model)
        {
            _logger.LogInformation("ReadList. StoreName:{StoreName}.Id:{ Id} ", model?.StoreName, model?.Id);

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

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

            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

        public bool Update(StoreBindingModel model)
        {
            CheckModel(model, false);

            if (string.IsNullOrEmpty(model.StoreName))
            {
                throw new ArgumentNullException("Store name is empty!", nameof(model.StoreName));
            }

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

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

            if (!withParams)
            {
                return;
            }

            if (string.IsNullOrEmpty(model.StoreName))
            {
                throw new ArgumentNullException("Store name is empty!", nameof(model.StoreName));
            }

            _logger.LogInformation("Store. StoreName:{0}.StoreAdress:{1}. Id: {2}", model.StoreName, model.StoreAddress, model.Id);
            var element = _storeStorage.GetElement(new StoreSearchModel
            {
                StoreName = model.StoreName
            });

            if (element != null && element.Id != model.Id && element.StoreName == model.StoreName)
            {
                throw new InvalidOperationException("This name of store is already exists!");
            }
        }
    }
}