""" XML helper functions.
"""
from typing import Optional
from typing import Tuple

from lxml import etree

from dbdeploy.base import config


def validate(
        xml_schema_file_path: str,
        xmlfile: str) -> Tuple[bool, Optional[str]]:
    """Validate file using given schema."""
    with open(xml_schema_file_path, 'r') as f:
        schema_root = etree.XML(f.read().encode())
        schema = etree.XMLSchema(schema_root)
        xmlparser = etree.XMLParser(schema=schema, encoding="utf-8")
        try:
            etree.fromstring(xmlfile.encode(), xmlparser)
            return True, None
        except etree.XMLSchemaError as err:
            return False, str(err)
        except etree.XMLSyntaxError as err:
            return False, str(err)


def get_schema_file_path(flow_name: str) -> Optional[str]:
    """Get input file schema."""
    return config.XML_SCHEMA_FILE.get(flow_name)