using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TaskTrackerContracts.BindingModels;
using TaskTrackerContracts.BusinessLogicContracts;
using TaskTrackerContracts.SearchModels;
using TaskTrackerContracts.StoragesContracts;
using TaskTrackerContracts.ViewModels;

namespace TaskTrackerBusinessLogic
{
	public class EmployeeLogic : IEmployeeLogic
	{
		private readonly ILogger _logger;
		private readonly IEmployeeStorage _employeeStorage;
		public EmployeeLogic(ILogger<EmployeeLogic> logger, IEmployeeStorage
	   employeeStorage)
		{
			_logger = logger;
			_employeeStorage = employeeStorage;
		}
		public List<EmployeeViewModel>? ReadList(EmployeeSearchModel? model)
		{
			_logger.LogInformation("ReadList. EmployeeName:{EmployeeName}.Id:{ Id}", model?.Name, model?.Id);
			var list = model == null ? _employeeStorage.GetFullList() :
	_employeeStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}
			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
			return list;
		}
		public EmployeeViewModel? ReadElement(EmployeeSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement. EmployeeName:{EmployeeName}. Id:{ Id}", model.Name, model.Id);
			var element = _employeeStorage.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(EmployeeBindingModel model)
		{
			CheckModel(model);
			if (_employeeStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;

		}
		public bool Update(EmployeeBindingModel model)
		{
			CheckModel(model);
			if (_employeeStorage.Update(model) == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			return true;
		}
		public bool Delete(EmployeeBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Id:{Id}", model.Id);
			if (_employeeStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}
		private void CheckModel(EmployeeBindingModel model, bool withParams =
	   true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.Name))
			{
				throw new ArgumentNullException("Нет имени компании",
			   nameof(model.Name));
			}
			if (string.IsNullOrEmpty(model.Email))
			{
				throw new ArgumentNullException("ГДЕ EMAIL", nameof(model.Email));
			}
			if (string.IsNullOrEmpty(model.JobTitle))
			{
				throw new ArgumentNullException("ДОЛЖНОСТЬ?", nameof(model.JobTitle));
			}
			
			_logger.LogInformation("Employee. EmployeeName:{EmployeeName}.  Id: { Id}  ", model.Name, model.Id);
			var element = _employeeStorage.GetElement(new EmployeeSearchModel
			{
				Name = model.Name
			}) ;
			if (element != null && element.Id != model.Id)
			{
				throw new InvalidOperationException("Компонент с таким названием уже есть");
			}
		}
	}
}