#!/usr/bin/env python3
#
# Copyright (C) 2023 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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, see <http://www.gnu.org/licenses/>.
#
#

import sys
import json
from argparse import ArgumentParser
from argparse import ArgumentTypeError
from os import getcwd
from os import makedirs
from os.path import join
from os.path import abspath
from os.path import dirname
from os.path import basename
from xmltodict import parse

_here = dirname(__file__)

sys.path.append(join(_here, '..'))
from configtree import reference_tree_to_json, ConfigTreeError

xml_cache_json = 'xml_cache.json'
xml_tmp = join('/tmp', xml_cache_json)
pkg_cache = abspath(join(_here, 'pkg_cache'))
ref_cache = abspath(join(_here, 'cache.py'))

node_data_fields = ("node_type", "multi", "valueless", "default_value")

def trim_node_data(cache: dict):
    for k in list(cache):
        if k == "node_data":
            for l in list(cache[k]):
                if l not in node_data_fields:
                    del cache[k][l]
        else:
            if isinstance(cache[k], dict):
                trim_node_data(cache[k])

def non_trivial(s):
    if not s:
        raise ArgumentTypeError("Argument must be non empty string")
    if s == 'vyos-1x' and basename(getcwd()) != 'vyos-1x':
        # builds outside of vyos-1x must specify package name
        raise ArgumentTypeError("Specify package name")
    return s

def main():
    parser = ArgumentParser(description='generate and save dict from xml defintions')
    parser.add_argument('--xml-dir', type=str, required=True,
                        help='transcluded xml interface-definition directory')
    parser.add_argument('--package-name', type=non_trivial, default='vyos-1x',
                        help='name of current package')
    parser.add_argument('--output-path', help='path to generated cache')
    args = vars(parser.parse_args())

    xml_dir = abspath(args['xml_dir'])
    pkg_name = args['package_name'].replace('-','_')
    cache_name = pkg_name + '_cache.py'
    out_path = args['output_path']
    path = out_path if out_path is not None else pkg_cache
    xml_cache = abspath(join(path, cache_name))

    try:
        reference_tree_to_json(xml_dir, xml_tmp)
    except ConfigTreeError as e:
        print(e)
        sys.exit(1)

    with open(xml_tmp) as f:
        d = json.loads(f.read())

    trim_node_data(d)

    syntax_version = join(xml_dir, 'xml-component-version.xml')
    try:
        with open(syntax_version) as f:
            component = f.read()
    except FileNotFoundError:
        if pkg_name != 'vyos_1x':
            component = ''
        else:
            print("\nWARNING: missing xml-component-version.xml\n")
            sys.exit(1)

    if component:
        parsed = parse(component)
    else:
        parsed = None
    version = {}
    # addon package definitions may have empty (== 0) version info
    if parsed is not None and parsed['interfaceDefinition'] is not None:
        converted = parsed['interfaceDefinition']['syntaxVersion']
        if not isinstance(converted, list):
            converted = [converted]
        for i in converted:
            tmp = {i['@component']: i['@version']}
            version |= tmp

    version = {"component_version": version}

    d |= version

    with open(xml_cache, 'w') as f:
        f.write(f'reference = {str(d)}')

    print(cache_name)

if __name__ == '__main__':
    main()