import json
from functools import partial
from os import listdir
from os.path import getmtime, join
from datetime import datetime
from sh import find, facter
from util import slurp, thread

# this script emits json on standard out that has information about tilde.town
# users. It denotes who has not updated their page from the default. It also
# reports the time this script was run. The user list is sorted by public_html update time.


DEFAULT_HTML = slurp("/etc/skel/public_html/index.html")

username_to_html_path = lambda u: "/home/{}/public_html".format(u)

def default_p(username):
    return DEFAULT_HTML == slurp(join(username_to_html_path(username), "index.html"))

def bounded_find(path):
    # find might return 1 but still have worked fine.
    return find(path, "-maxdepth" "3", _ok_code=[0,1])

def guarded_mtime(path):
    try:
        return getmtime(path.rstrip())
    except Exception as _:
        return 0

def modify_time(username):
    files_to_mtimes = partial(map, guarded_mtime)
    return thread(username,
                  username_to_html_path,
                  bounded_find,
                  files_to_mtimes,
                  list,
                  max)

def sort_user_list(usernames):
    return sorted(usernames, key=modify_time)

def user_generator():
    ignore_system_users = lambda f: f != "ubuntu" and f != "poetry"
    return filter(ignore_system_users, listdir("/home"))

def get_user_data():
    username_to_data = lambda u: {'username': u,
                                  'default': default_p(u),
                                  'favicon':'TODO'}
    live_p = lambda user: not user['default']

    all_users = thread(user_generator(),
                       sort_user_list,
                       reversed,
                       partial(map, username_to_data),
                       list)

    live_users = list(filter(live_p, all_users))

    active_user_count = int(facter("active_user_count").stdout.strip())

    return {'all_users': all_users,
            'num_users': len(all_users),
            'num_live_users': len(live_users),
            'active_user_count': active_user_count,
            'live_users': live_users,}

def get_data():
    user_data = get_user_data()
    data = {'generated_at': datetime.now().strftime('%Y-%m-%d %H:%M:%S')}
    data.update(user_data)
    return data

if __name__ == '__main__':
    print(json.dumps(get_data()))