import os
import time


def read_conf():
    import tomllib
    with open('/etc/jellyfin-fml.toml', 'rb') as fp:
        conf = tomllib.load(fp)
    return (conf['configuration']['mq_host'],
            conf['configuration']['mq_user'],
            conf['configuration']['mq_password'])


def remaining_space_gb():
    from shutil import disk_usage
    total, used, free = disk_usage("/")
    return free / 1024**3


def all_transcodes():
    folder_path = '/var/lib/jellyfin/transcodes'
    files = os.listdir(folder_path)
    a = []
    for file in files:
        file_path = os.path.join(folder_path, file)
        creation_time = os.path.getctime(file_path)
        space = os.path.getsize(file_path)
        a.append((file, creation_time, space))
    return a


def pop(files):
    if a:
        a.sort(key=lambda t: t[1])
        return a[0]
    else:
        return None


def send_to_mq(mq_host, mq_user, mq_pass, space_rem, transcode_space):
    import pika
    import json
    creds = pika.PlainCredentials(mq_user, mq_pass)
    params = pika.ConnectionParameters(mq_host, 5672, "/", creds)
    conn = pika.BlockingConnection(params)
    channel = conn.channel()

    space_rem = round(space_rem, 2)
    msg = f'Paperino, manca spazio su disco: {space_rem}|{transcode_space}'
    ROOM_ID = '!KABwGlTSmXAbzCOhCX:goulash.lezzo.org'

    response = {
        'content': msg,
        'source_message_id': None,
        'room_id': ROOM_ID,
        'as_reply': False,
        'as_markdown': False,
    }
    mq_msg = json.dumps(response).encode()

    # channel.queue_declare(queue='jellyfin-fml')
    channel.basic_publish(exchange='', routing_key='lanonna', body=mq_msg)
    conn.close()


def main(mq_host, mq_user, mq_pass):
    while True:
        space_rem = remaining_space_gb()

        if space_rem >= 1.0:
            time.sleep(60)
        else:
            files = all_transcodes()
            total_space = sum(map(lambda t: t[2], files))
            send_to_mq(mq_host, mq_user, mq_pass, space_rem, total_space)

            while remaining_space_gb() < 2.0:
                file = pop(files)
                if not file:
                    break
                else:
                    os.remove(file)
                    files = all_transcodes()


if __name__ == '__main__':
    mq_host, mq_user, mq_pass = read_conf()
    main(mq_host, mq_user, mq_pass)