using CarServiceContracts.BindingModels;
using CarServiceContracts.BusinessLogicsContracts;
using CarServiceContracts.SearchModels;
using CarServiceContracts.StorageContracts;
using CarServiceContracts.ViewModels;
using Microsoft.Extensions.Logging;

namespace CarServiceBusinessLogic.BusinessLogics
{
	public class ItemForRepairLogic : IItemForRepairLogic
	{
		private readonly ILogger _logger;
		private readonly IItemForRepairStorage _itemForRepairStorage;
		private readonly IItemStorage _itemStorage;
		public ItemForRepairLogic(ILogger<ItemForRepairLogic> logger, IItemForRepairStorage itemForRepairStorage, IItemStorage itemStorage)
		{
			_logger = logger;
			_itemForRepairStorage = itemForRepairStorage;
			_itemStorage = itemStorage;
		}
		public List<ItemForRepairViewModel>? ReadList(ItemForRepairSearchModel? model)
		{
			_logger.LogInformation("ReadList. Id: {Id}", model?.Id);
			var list = model == null ? _itemForRepairStorage.GetFullList() : _itemForRepairStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}
			_logger.LogInformation("ReadList. Count: {Count}", list.Count);
			return list;
		}
		public ItemForRepairViewModel? ReadElement(ItemForRepairSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement. Id: {Id}", model.Id);
			var element = _itemForRepairStorage.GetElement(model);
			if (element == null)
			{
				_logger.LogWarning("ReadElement element not found");
				return null;
			}
			_logger.LogInformation("ReadElement found. Id: {Id}", element.Id);
			return element;
		}
		public bool Create(ItemForRepairBindingModel model)
		{
			CheckModel(model);
			//При добавлении привязки уменьшаем количество нужной статьи затрат
			var item = _itemStorage.GetElement(new() { Id = model.ItemId });
			if (_itemStorage.UpdateCount(item, -model.Count) == null)
			{
				_logger.LogWarning("Insert operation failed while updating count");
				return false;
			}
			if (_itemForRepairStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}
		public bool Update(ItemForRepairBindingModel model)
		{
			CheckModel(model);
			//Возвращаем нужное количество старых статей затрат на склад
			var oldItem = _itemStorage.GetElement(new() { Id = (_itemForRepairStorage.GetElement(new() { Id = model.ItemId })?.ItemId ?? -1) });
			if (_itemStorage.UpdateCount(oldItem, model.Count) == null)
			{
				_logger.LogWarning("Insert operation failed while returning old intem on storage");
				return false;
			}
			//Списываем новую статью затрат со склада в новом количестве
			var newItem = _itemStorage.GetElement(new() { Id = model.ItemId });
			if (_itemStorage.UpdateCount(newItem, -model.Count) == null)
			{
				_logger.LogWarning("Insert operation failed while updating count");
				return false;
			}
			if (_itemForRepairStorage.Update(model) == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			return true;
		}
		public bool Delete(ItemForRepairBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Id:{Id}", model.Id);
			if (_itemForRepairStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}
		private void CheckModel(ItemForRepairBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			//Получаем текущее число статей затрат выбранного вида на складе
			int currentItemOnStorage = _itemStorage.GetElement(new() { Id = model.ItemId })?.Count ?? -1;
			//Если на складе осталось статей затрат выбранного вида меньше, чем нужно на заявку, отменяем добавление привязки
			if (currentItemOnStorage < model.Count)
			{
				_logger.LogWarning("Not enough items {Id} on storage", model.ItemId);
				throw new ArgumentException("На складе не хватает запчастей");
			}
			_logger.LogInformation("ItemForRepair. Id: {Id}", model.Id);
		}
	}
}