import subprocess

def pullTags():
    result = subprocess.run(['git', 'fetch', '--tags'], stdout=subprocess.PIPE)

def getCurrentTag():
    result = subprocess.run(['git', 'rev-parse', 'HEAD'], stdout=subprocess.PIPE)
    result = result.stdout.decode('utf-8')[:-1]

    result = subprocess.run(['git', 'name-rev', '--tags', '--name-only', result], stdout=subprocess.PIPE)
    result = result.stdout.decode('utf-8')[:-1]

    return result

def checkTag():
    pullTags()

    result = subprocess.run(['git', 'tag'], stdout=subprocess.PIPE)
    result = result.stdout.decode('utf-8')[:-1].split('\n')

    latest_tag = getCurrentTag()

    for tag in result:
        if float(tag[1:]) > float(latest_tag[1:]):
            latest_tag = tag

    return latest_tag

def update(recursive=False):
    current_tag = getCurrentTag()
    latest_tag = checkTag()

    if recursive:
        print(current_tag, latest_tag)

    if current_tag != latest_tag:
        print("update")
        result = subprocess.run(['git', 'checkout', latest_tag], stdout=subprocess.PIPE)
        update(recursive=True)
    else:
        print("no update nessesary")

    result = subprocess.run(['systemctl', 'restart', 'hardware-monitor.service'], stdout=subprocess.PIPE)

if __name__ == "__main__":
    update()