#!/usr/bin/python3
import json
import sys
import re

from catalog_update.upgrade_strategy import datetime_versioning


RE_STABLE_VERSION = re.compile(r'^(\d+\.){4}\d+$')


def newer_mapping(image_tags):
    key = list(image_tags.keys())[0]
    temp_tags = {t: t for t in image_tags[key] if RE_STABLE_VERSION.fullmatch(t)}
    tags = {}
    for tag in temp_tags:
        tag = tag.split('.')
        for i in range(len(tag)):
            # Add leading zero to single digit numbers
            if len(tag[i]) == 1:
                tag[i] = '0' + tag[i]
        tag = '.'.join(tag)
        tags[tag] = tag

    version = datetime_versioning(list(tags), '%y.%m.%d.%H.%M')
    if not version:
        return {}

    return {
        'tags': {key: tags[version]},
        'app_version': version,
    }


if __name__ == '__main__':
    try:
        versions_json = json.loads(sys.stdin.read())
    except ValueError:
        raise ValueError('Invalid json specified')

    print(json.dumps(newer_mapping(versions_json)))