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 ShopLogic : IShopLogic
    {
        private readonly ILogger _logger;
        private readonly IShopStorage _shopStorage;
        public ShopLogic(ILogger<ShopLogic> logger, IShopStorage shopStorage)
        {
            _logger = logger;
            _shopStorage = shopStorage;
        }
        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 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 bool Create(ShopBindingModel model)
        {
            CheckModel(model);
            if (_shopStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(ShopBindingModel model)
        {
            CheckModel(model);
            if (_shopStorage.Update(model) == null)
            {
                _logger.LogWarning("Update 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;
        }
        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));
            }
            if (model.MaxCountSushi < 0)
            {
                throw new ArgumentException(
                    "Максимальное количество суши в магазине не может быть меньше нуля",
                    nameof(model.MaxCountSushi));
            }
            _logger.LogInformation("Shop. ShopName:{0}.Address:{1}. Id: {2}",
                model.ShopName, model.Address, 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");
            }
        }

        public bool AddSushiInShop(ShopSearchModel model, ISushiModel sushi, int count)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (count <= 0)
            {
                throw new ArgumentException("Количество суши должно быть больше 0", nameof(count));
            }
            _logger.LogInformation("AddSushiInShop. ShopName:{ShopName}.Id:{ Id}",
                model.ShopName, model.Id);
            var element = _shopStorage.GetElement(model);
            if (element == null)
            {
                _logger.LogWarning("AddSushiInShop element not found");
                return false;
            }
            if (element.MaxCountSushi - 
                element.ListSushi.Select(x => x.Value.Item2).Sum() < count)
            {
                throw new ArgumentNullException("Магазин переполнен", nameof(count));
            }
            _logger.LogInformation("AddSushiInShop find. Id:{Id}", element.Id);

            if (element.ListSushi.TryGetValue(sushi.Id, out var pair))
            {
                element.ListSushi[sushi.Id] = (sushi, count + pair.Item2);
                _logger.LogInformation(
                    "AddSushiInShop. Added {count} {sushi} to '{ShopName}' shop",
                    count, sushi.SushiName, element.ShopName);
            }
            else
            {
                element.ListSushi[sushi.Id] = (sushi, count);
                _logger.LogInformation(
                    "AddSushiInShop. Added {count} new sushi {sushi} to '{ShopName}' shop",
                    count, sushi.SushiName, element.ShopName);
            }
            _shopStorage.Update(new() {
                Id = element.Id,
                Address = element.Address,
                ShopName = element.ShopName,
                DateOpening = element.DateOpening,
                MaxCountSushi = element.MaxCountSushi,
                ListSushi = element.ListSushi,
            });
            return true;
        }

        public bool AddSushi(ISushiModel model, int count)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (count <= 0)
            {
                throw new ArgumentException("Количество суши должно быть больше 0", nameof(count));
            }
            var freeCount = _shopStorage.GetFullList()
                .Select(x => x.MaxCountSushi - x.ListSushi
                .Select(p => p.Value.Item2).Sum()).Sum() - count;
            if (freeCount < 0)
            {
                _logger.LogInformation("AddSushi. Не удалось добавить изделия в магазины, они переполнены.");
                return false;
            }
            foreach (var shop in _shopStorage.GetFullList())
            {
                int countFree = shop.MaxCountSushi - shop.ListSushi.Select(x => x.Value.Item2).Sum();
                if (countFree < count)
                {
                    if (!AddSushiInShop(new() { Id = shop.Id }, model, countFree))
                    {
                        _logger.LogWarning("AddSushiInShop operation failed.");
                        return false;
                    }
                    count -= countFree;
                }
                else
                {
                    if (!AddSushiInShop(new() { Id = shop.Id }, model, count))
                    {
                        _logger.LogWarning("AddSushiInShop operation failed.");
                        return false;
                    }
                    count = 0;
                }
                if (count == 0)
                {
                    return true;
                }
            }
            _logger.LogWarning("AddSushi operation failed.");
            return false;
        }

        public bool SellSushi(ISushiModel model, int count)
        {
            return _shopStorage.SellSushi(model, count);
        }
    }
}