#!/usr/bin/env python3
#
# Copyright (C) 2024 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/>.
#
# Purpose: merges multiple flavor files into one

import sys

import tomli
import tomli_w

def load_flavor(file_path):
    with open(file_path, 'rb') as f:
        flavor_def = tomli.load(f)

    return flavor_def

# XXX: at the moment, this script is only used
# to produce a meta-flavor for collecting packages
# used in multiple flavors,
# so it ignores all other flavor fields for now
def merge_flavors(l, r):
    if 'packages' in r:
        l['packages'] += r['packages']

    for arch in r.get('architectures', []):
        if arch not in l['architectures']:
            l['architectures'][arch] = {}

        if 'packages' not in l['architectures'][arch]:
            l['architectures'][arch]['packages'] = []

        if 'packages' in r['architectures'][arch]:
            l['architectures'][arch]['packages'] += \
              r['architectures'][arch]['packages']

    return l

if __name__ == '__main__':
    if len(sys.argv) < 3:
        print("Please specify a base flavor and a list of flavor files to merge!")
        sys.exit(1)

    base_flavor = load_flavor(sys.argv[1])

    if 'architectures' not in base_flavor:
        base_flavor['architectures'] = {}

    if 'packages' not in base_flavor:
        base_flavor['packages'] = []

    flavor_files = sys.argv[2:]
    flavor_defs = map(load_flavor, flavor_files)

    for fd in flavor_defs:
        merge_flavors(base_flavor, fd)

    base_flavor['packages'] = list(set(base_flavor['packages']))
    for arch in base_flavor.get('architectures'):
        if 'packages' in base_flavor['architectures'][arch]:
            base_flavor['architectures'][arch]['packages'] = \
              list(set(base_flavor['architectures'][arch]['packages']))

    print(tomli_w.dumps(base_flavor))