using Microsoft.Extensions.Logging;
using PlumbingRepairContracts.BindingModels;
using PlumbingRepairContracts.BusinessLogicsContracts;
using PlumbingRepairContracts.SearchModels;
using PlumbingRepairContracts.StoragesContracts;
using PlumbingRepairContracts.ViewModels;
using PlumbingRepairDataModels.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace PlumbingRepairBusinessLogic.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;
        }
        public bool StoreReplenishment(ShopSearchModel shopModel, IWorkModel workModel, int count)
        {
            if (shopModel == null)
            {
                throw new ArgumentNullException(nameof(shopModel));
            }
            if (workModel == null)
            {
                throw new ArgumentNullException(nameof(workModel));
            }
            if (count <= 0)
            {
                throw new ArgumentNullException("Количество товаров должно быть больше 0", nameof(count));
            }
            _logger.LogInformation("StoreReplenishment. ShopName:{ShopName}. Id:{Id}", shopModel.ShopName, shopModel.Id);
            var element = _shopStorage.GetElement(shopModel);
            if (element == null)
            {
                throw new InvalidOperationException("Ошибка. Элемент не найден");
            }
            if(element.maxCountWorks - element.ShopWorks.Sum(x => x.Value.Item2) < count)
            {
                throw new InvalidOperationException("Ошибка. Нет места в магазине");
            }
            if(element.ShopWorks.ContainsKey(workModel.Id))
            {
                var oldWorks = element.ShopWorks[workModel.Id];
                oldWorks.Item2 += count;
                element.ShopWorks[workModel.Id] = oldWorks;
                _logger.LogInformation("StoreReplenishment. Added {count} '{work}' to '{ShopName}' shop", count, workModel.WorkName,shopModel.ShopName);
            }
            else
            {
                element.ShopWorks.Add(workModel.Id,(workModel, count));
                _logger.LogInformation("StoreReplenishment. Added {count} new '{work}' to '{ShopName}' shop", count, workModel.WorkName, shopModel.ShopName);
            }
            if(_shopStorage.Update(new ShopBindingModel()
            {
                Id = element.Id,
                ShopName = element.ShopName,
                Address = element.Address,
                DateOpening = element.DateOpening,
                maxCountWorks = element.maxCountWorks,
                ShopWorks= element.ShopWorks,
            }) == null)
            {
                _logger.LogInformation("StoreReplenishment. Update operation failed");
                return false;
            }
            return true;
            
        }

        public bool CheckAndSupply(IWorkModel model, int count)
        {
            if (count<0)
            {
                _logger.LogWarning("Checksupply operation error. Works count < 0.");
                return false;
            }
            var shopList = _shopStorage.GetFullList();
            int shopsCapacity = shopList.Sum(x => x.maxCountWorks);
            int currentWorks = shopList.Select(x => x.ShopWorks.Sum(x => x.Value.Item2)).Sum();
            int freespace = shopsCapacity - currentWorks;
            if ( freespace < count)
            {
                _logger.LogWarning("Checksupply operation error. No space for a new work.");
                return false;
            }
            foreach (var shop in shopList)
            {
                int freePlaces = shop.maxCountWorks - shop.ShopWorks.Select(x => x.Value.Item2).Sum();
                if (freePlaces == 0)
                {
                    continue;
                }
                if( freePlaces - count >= 0)
                {
                    if (StoreReplenishment(new() { Id = shop.Id }, model, count))
                        count = 0;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (freePlaces - count < 0)
                {
                    if (StoreReplenishment(new() { Id = shop.Id }, model, freePlaces))
                        count-= freePlaces;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (count == 0)
                    return true;
            }
            return false;
        }
        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 (string.IsNullOrEmpty(model.Address))
            {
                throw new ArgumentNullException("Нет адреса магазина", nameof(model.ShopName));
            }
            if (model.maxCountWorks < 0)
            {
                throw new InvalidOperationException("Максимальное количество работ магазина отрицательно");
            }
            _logger.LogInformation("Shop. ShopName:{ShopName}. Address:{Address}. Id:{Id}", model.ShopName, model.Address, model.Id);
            var element = _shopStorage.GetElement(new ShopSearchModel
            {
                ShopName = model.ShopName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Компонент с таким названием уже есть");
            }
        }
        public bool SellWork(IWorkModel model, int count)
        {
            return _shopStorage.SellWork(model, count);
        }
    }
}