"""load XML file from directory

Created by:
EOLE (http://eole.orion.education.fr)
Copyright (C) 2005-2018

Forked by:
Cadoles (http://www.cadoles.com)
Copyright (C) 2019-2021

distribued with GPL-2 or later license

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
"""
from typing import List
from os.path import join, isfile
from os import listdir

from lxml.etree import DTD, parse, XMLSyntaxError  # pylint: disable=E0611

from .i18n import _
from .error import DictConsistencyError


class XMLReflector:
    """Helper class for loading the Creole XML file,
    parsing it, validating against the Creole DTD,
    writing the xml result on the disk
    """
    def __init__(self,
                 rougailconfig: 'RougailConfig',
                 ) -> None:
        """Loads the Creole DTD

        :raises IOError: if the DTD is not found

        :param dtdfilename: the full filename of the Creole DTD
        """
        dtdfilename = rougailconfig['dtdfilename']
        if not isfile(dtdfilename):
            raise IOError(_("no such DTD file: {}").format(dtdfilename))
        with open(dtdfilename, 'r') as dtdfd:
            self.dtd = DTD(dtdfd)

    def load_xml_from_folders(self,
                              xmlfolders: List[str],
                              ):
        """Loads all the XML files located in the xmlfolders' list

        :param xmlfolders: list of full folder's name
        """
        for xmlfolder in xmlfolders:
            filenames = [join(xmlfolder, filename) for filename in listdir(xmlfolder) if \
                         filename.endswith('.xml')]
            filenames.sort()
            if not filenames:
                raise DictConsistencyError(_('there is no XML file'), 77, [xmlfolder])
            for xmlfile in filenames:
                try:
                    document = parse(xmlfile)
                except XMLSyntaxError as err:
                    raise DictConsistencyError(_(f'not a XML file: {err}'), 52, [xmlfile]) from err
                if not self.dtd.validate(document):
                    dtd_error = self.dtd.error_log.filter_from_errors()[0]
                    msg = _(f'not a valid XML file: {dtd_error}')
                    raise DictConsistencyError(msg, 43, [xmlfile])
                yield xmlfile, document.getroot()