# -*- coding: utf-8 -*-

import bcrypt
import dns.exception
import dns.resolver
import os
import requests
import socket
import ssl
import subprocess

NULL_IP = '[100::1]'

def compile_url(domain, port, proto='https'):
    port = ':{}'.format(port) if (proto == 'https' and port != '443') or (proto == 'http' and port != '80') else ''
    host = '{}{}'.format(domain, port)
    return '{}://{}'.format(proto, host) if proto is not None else host

def get_container_ip(app):
    # Return an IP address of a container. If the container is not running, return address from IPv6 discard prefix instead
    try:
        return subprocess.run(['/usr/bin/docker', 'inspect', '-f', '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}', app], check=True, stdout=subprocess.PIPE).stdout.decode().strip()
    except:
        return NULL_IP

def get_local_ipv4():
    # Return first routable IPv4 address
    try:
        return subprocess.run(['/sbin/ip', 'route', 'get', '1'], check=True, stdout=subprocess.PIPE).stdout.decode().split()[-1]
    except:
        return None

def get_local_ipv6():
    # Return first routable IPv6 address
    try:
        return subprocess.run(['/sbin/ip', 'route', 'get', '2003::'], check=True, stdout=subprocess.PIPE).stdout.decode().split()[-3]
    except:
        return None

def get_external_ip(family):
    # Return external IP address of given family via 3rd party service
    allowed_gai_family = requests.packages.urllib3.util.connection.allowed_gai_family
    try:
        requests.packages.urllib3.util.connection.allowed_gai_family = lambda: family
        return requests.get('https://tools.dasm.cz/myip.php', timeout=5).text
    except:
        return None
    finally:
        requests.packages.urllib3.util.connection.allowed_gai_family = allowed_gai_family

def get_external_ipv4():
    # Return external IPv4 address
    return get_external_ip(socket.AF_INET)

def get_external_ipv6():
    # Return external IPv6 address
    return get_external_ip(socket.AF_INET6)

resolver = dns.resolver.Resolver()
resolver.timeout = 3
resolver.lifetime = 3
resolver.nameservers = ['8.8.8.8', '8.8.4.4', '2001:4860:4860::8888', '2001:4860:4860::8844']

def resolve_ip(domain, type):
    # Resolve domain name using Google Public DNS
    try:
        return resolver.query(domain, type)[0].address
    except dns.exception.Timeout:
        raise
    except:
        return None

def ping_url(url):
    try:
        return requests.post('https://tools.dasm.cz/vm-ping.php', data = {'url': url}, timeout=5).text == 'vm-pong'
    except requests.exceptions.Timeout:
        raise
    except:
        return False

def is_service_started(app):
    # Check OpenRC service status without calling any binary
    return os.path.exists(os.path.join('/run/openrc/started', app))

def is_service_autostarted(app):
    # Check OpenRC service enablement
    return os.path.exists(os.path.join('/etc/runlevels/default', app))

def start_service(service):
    subprocess.run(['/sbin/service', service, 'start'], check=True)

def stop_service(service):
    subprocess.run(['/sbin/service', service, 'stop'], check=True)

def restart_service(service):
    subprocess.run(['/sbin/service', service, 'restart'])

def reload_nginx():
    subprocess.run(['/sbin/service', 'nginx', 'reload'])

def restart_nginx():
    restart_service('nginx')

def get_cert_info(cert):
    data = ssl._ssl._test_decode_cert(cert)
    data['subject'] = dict(data['subject'][i][0] for i in range(len(data['subject'])))
    data['issuer'] = dict(data['issuer'][i][0] for i in range(len(data['issuer'])))
    return data

def adminpwd_hash(password):
    return bcrypt.hashpw(password.encode(), bcrypt.gensalt()).decode()

def adminpwd_verify(password, hash):
    return bcrypt.checkpw(password.encode(), hash.encode())

def update_luks_password(oldpassword, newpassword):
    input = '{}\n{}'.format(oldpassword, newpassword).encode()
    subprocess.run(['cryptsetup', 'luksChangeKey', '/dev/sda2'], input=input, check=True)

def shutdown_vm():
    subprocess.run(['/sbin/poweroff'])

def reboot_vm():
    subprocess.run(['/sbin/reboot'])