#!/usr/bin/env python3
# This file is placed in the Public Domain.
#
# pylint: disable=C,R,W0201,W0212,W0105,W0613,W0406,W0611,E0102


"daemon"


import getpass
import os
import pwd
import sys


from rssbot.locate import Storage
from rssbot.errors import Errors
from rssbot.object import Default, cdir
from rssbot.reacts import forever, init


Cfg         = Default()
Cfg.mod     = "cmd,err,irc,rss,thr"
Cfg.name    = "rssbot"
Storage.wd  = os.path.expanduser(f"~/.{Cfg.name}")
Cfg.pidfile = os.path.join(Storage.wd, f"{Cfg.name}.pid")
Cfg.version = "3"
Cfg.user    = getpass.getuser()


from rssbot import modules


def daemon(pidfile, verbose=False):
    pid = os.fork()
    if pid != 0:
        os._exit(0)
    os.setsid()
    pid2 = os.fork()
    if pid2 != 0:
        os._exit(0)
    if not verbose:
        with open('/dev/null', 'r', encoding="utf-8") as sis:
            os.dup2(sis.fileno(), sys.stdin.fileno())
        with open('/dev/null', 'a+', encoding="utf-8") as sos:
            os.dup2(sos.fileno(), sys.stdout.fileno())
        with open('/dev/null', 'a+', encoding="utf-8") as ses:
            os.dup2(ses.fileno(), sys.stderr.fileno())
    os.umask(0)
    os.chdir("/")
    if os.path.exists(pidfile):
        os.unlink(pidfile)
    cdir(os.path.dirname(pidfile))
    with open(pidfile, "w", encoding="utf-8") as fds:
        fds.write(str(os.getpid()))


def privileges(username):
    pwnam = pwd.getpwnam(username)
    os.setgid(pwnam.pw_gid)
    os.setuid(pwnam.pw_uid)


def main():
    daemon(Cfg.pidfile)
    privileges(Cfg.user)
    init(modules, Cfg.mod)
    forever()


if __name__ == "__main__":
    main()
