#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Sep 27 14:20:58 2019

@author: tanya
"""

import os
import sys
import logging
import pandas as pd
sys.path.append(os.getcwd())


class ExceptionsHandler:
    '''
    '''
    def __init__(self):
        '''
        '''

    def check_is_file(self, path):
        '''
        '''
        if not os.path.isfile(path):
            err = "File {} not found".format(path)
            self._log.error(err)
            raise FileNotFoundError(err)

    def _check_column_abscence(self, columns: (str, list), data: pd.DataFrame,
                               error_or_warning: str, logger = None):
        '''
        '''
        if logger is None:
            logger = logging.getLogger()
        if isinstance(columns, str):
            columns = [columns]

        for column in columns:

            if column not in data.columns:
                err = ("{} is not an internal column name".format(column))
                getattr(logger, error_or_warning)(err)

                if error_or_warning == "error":
                    raise Exception(err)

    def error_column_abscence(self, columns: (str, list), data: pd.DataFrame, logger = None):
        '''
        '''
        return self._check_column_abscence(columns=columns,
                                           data=data,
                                           error_or_warning="error",
                                           logger=logger)

    def warn_column_abscence(self, columns: (str, list), data: pd.DataFrame, logger = None):
        '''
        '''
        return self._check_column_abscence(columns=columns,
                                           data=data,
                                           error_or_warning="warning",
                                           logger=logger)