#!/usr/bin/env python
# Copyright 2024 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import os
import tempfile
import shutil

import sh

tmp_dir = tempfile.mkdtemp()
os.chdir(tmp_dir)

print 'Downloading timezone data to {}'.format(tmp_dir)

sh.wget('--retr-symlinks', 'ftp://ftp.iana.org/tz/tz*-latest.tar.gz')

print 'Download complete'
print sh.ls('-la', 'tzdata-latest.tar.gz').strip()

sh.tar('-xvzf', 'tzdata-latest.tar.gz')

# backward goes last so we can just always do backreferences for links
sh.cat('africa', 'antarctica', 'asia', 'australasia', 'europe', 'etcetera', 'northamerica', 'southamerica', 'backward', _out='timezones_olson.txt')
print 'Updated database written to {}'.format(os.path.realpath('timezones_olson.txt'))