# -*- coding: utf-8 -*-
#
#    Copyright 2019-2020 Fabien Bourgeois <fabien@yaltik.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as
#    published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

""" XML helpers and macros """

from os import path
import xml.etree.ElementTree as ET
from xml.dom import minidom
from typing import Dict, List, Union, Any


# TODO: fix MyPy / typing
# REF and test xml_write

data XMLDictElement(tag: XMLText, attrs: XMLAttrs, children: List[Any])

XMLText = Union[str, unicode]
XMLAttrs = Dict[str, str]
XMLChild = Union[XMLDictElement, XMLText, List]


def xmlroot(tree: Dict[str, Any]) -> ET.Element:
    """ Special process for root XML Node """
    rootel = (tree['tag'], tree['attrs']) |*> ET.Element
    if 'children' in tree:
      (rootel, tree['children']) |*> xmlchild
    return rootel

def xmlchild(parent: ET.Element, children: XMLDictElement) -> None:
    """ Handling of children (ie non root) XML Nodes with/o text and
    subchildren (recursive) """
    case children:
        match _ is XMLText:
            parent.text = children
        match _ is XMLDictElement:
            attrs = {unicode(k): unicode(v) for [k, v] in children.attrs.items()}
            new_parent = (parent, children.tag, attrs) |*> ET.SubElement
            subchildren = children.children
            if subchildren:
                (new_parent, subchildren) |*> xmlchild
        match _ is list:
            ((xmlchild$ <| parent), children) |*> map |> consume
    else:
        raise TypeError('Invalid arguments for xmlchild')


def xmln(tag: XMLText = '',
         attrs: XMLAttrs = {},
         children: Union[str, List] = []) -> XMLDictElement:
    """ XMLNode with default children, not attributes """
    case children:
        match c is str:
            return XMLDictElement(tag=tag, attrs=attrs, children=[c])
            # return {'tag': tag, 'attrs': attrs, 'children': [c]}
        match c is list:
            return XMLDictElement(tag=tag, attrs=attrs, children=c)
            # return {'tag': tag, 'attrs': attrs, 'children': c}
    else:
      raise TypeError('Invalid arguments for xmln')

def xml_write(filepath, tree):
    """ Write XML file according to filename and given tree """
    if filepath.endswith('.py'): # if .pyc, no need to generate XML
        output_xml = minidom.parseString(ET.tostring(tree)).toprettyxml(indent='    ')
        output_path = path.dirname(path.abspath(filepath))
        fpath = '%s/%s' % (output_path, path.basename(filepath).replace('.py', '_views.xml'))
        with open(fpath, 'w') as output_file:
            output_file.write(output_xml)