#!/usr/bin/env python3

import os
import sys
import subprocess
import configparser
import re
from lib.zulip_tools import parse_lsb_release, assert_running_as_root

assert_running_as_root()
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

force = False
extra_args = sys.argv[1:]

if len(extra_args) and extra_args[0] in ('-f', '--force'):
    force = True
    extra_args = extra_args[1:]

config = configparser.RawConfigParser()
config.read("/etc/zulip/zulip.conf")

if not os.path.exists("/etc/puppet/hiera.yaml"):
    codename = parse_lsb_release()['DISTRIB_CODENAME']
    if codename in ["trusty", "stretch", "xenial"]:
        # Suppress warnings in old puppet about hiera.yaml not existing.
        open("/etc/puppet/hiera.yaml", "a").close()

puppet_config = """
Exec { path => "/usr/sbin:/usr/bin:/sbin:/bin" }
"""

for pclass in re.split(r'\s*,\s*', config.get('machine', 'puppet_classes')):
    puppet_config += "include %s\n" % (pclass,)

# We use the puppet configuration from the same Zulip checkout as this script
scripts_path = os.path.join(BASE_DIR, "scripts")
puppet_module_path = os.path.join(BASE_DIR, "puppet")
puppet_cmd = ["puppet", "apply", "--modulepath", puppet_module_path, "-e", puppet_config]
puppet_cmd += extra_args

# Set the scripts path to be a factor so it can be used by puppet code
puppet_env = os.environ.copy()
puppet_env["FACTER_zulip_scripts_path"] = scripts_path

if not force:
    subprocess.check_call(puppet_cmd + ['--noop', '--show_diff'], env=puppet_env)

    do_apply = None
    while do_apply != 'y':
        sys.stdout.write("Apply changes? [y/N] ")
        sys.stdout.flush()
        do_apply = sys.stdin.readline().strip().lower()
        if do_apply == '' or do_apply == 'n':
            sys.exit(0)

ret = subprocess.call(puppet_cmd + ['--detailed-exitcodes'], env=puppet_env)
# ret = 0 => no changes, no errors
# ret = 2 => changes, no errors
# ret = 4 => no changes, yes errors
# ret = 6 => changes, yes errors
if ret != 0 and ret != 2:
    sys.exit(1)