#!/usr/bin/env python3
# File: generate-pihole-dns-dhcp.py
#
# Description: This file generates the DNS and DHCP files for pihole.
#
# Package: AniNIX/Ubiqtorate
# Copyright: WTFPL
#
# Author: DarkFeather <darkfeather@aninix.net>

import os
import subprocess
import sys
import yaml

rolepath='../roles/Sharingan/files'
monfilepath=rolepath+"/monit/checks/availability"

def WriteMonitoringEntry(content,hosttype,hostclass):
    ### Create the ping-based monitoring entry
    # param content: the yaml content to parse
    # param hosttype: managed or unmanaged
    # param hostclass: the type of host as classified in the yaml
    global monfile

    with open(monfilepath,'a') as monfile:

        # Write host entries
        for host in content['all']['children'][hosttype]['children'][hostclass]['hosts']:
            try:
                hostname= host + '.' + content['all']['vars']['replica_domain']
                monfile.write('check program ' + host + '_ping_mon with path "/usr/lib/monitoring-plugins/check_ping -H ' + hostname + ' -w 100,50% -c 1000,100% -p 3 -t 60 -4"\n')
                monfile.write('    if status != 0 for 3 times within 5 cycles then exec "/etc/monit.d/scripts/critical ' + hostname + ' is not online."\n\n')
            except:
                print(host + ' is not complete for monitoring.')

def WriteSSHMonitoringEntry(content,hosttype,hostclass):
    ### Create the ping-based monitoring entry
    # param content: the yaml content to parse
    # param hosttype: managed or unmanaged
    # param hostclass: the type of host as classified in the yaml
    global monfile

    with open(monfilepath,'a') as monfile:

        # Write host entries
        for host in content['all']['children'][hosttype]['children'][hostclass]['hosts']:
            try:
                hostname= host + '.' + content['all']['vars']['replica_domain']
                monfile.write('check program ' + host + '_ssh_mon with path "/usr/lib/monitoring-plugins/check_ssh -H ' + hostname + '"\n')
                monfile.write('    if status != 0 for 3 times within 5 cycles then exec "/etc/monit.d/scripts/critical ' + hostname + ' is not responding to SSH."\n\n')
            except:
                print(host + ' is not complete for monitoring.')

def GenerateFiles(file):
    ### Open the file and parse it
    # param file: the file to work on
    global monfilepath

    if not os.path.isdir(rolepath):
        os.mkdir(rolepath)

    # Parse the yaml
    with open(file, 'r') as stream:
        content = yaml.safe_load(stream)

    if os.path.isfile(monfilepath): os.remove(monfilepath)

    # Add DNS entries for each host
    hosttype = 'managed'
    for hostclass in ['physical','virtual','geth_hubs']:
        #WriteMonitoringEntry(content,hosttype,hostclass)
        WriteSSHMonitoringEntry(content,hosttype,hostclass)
    hosttype = 'unmanaged'
    for hostclass in ['ovas','appliances']:
        WriteMonitoringEntry(content,hosttype,hostclass)

if __name__ == '__main__':
    if len(sys.argv) != 2:
        print("You need to supply an inventory file.")
        sys.exit(1)
    GenerateFiles(sys.argv[1])
    sys.exit(0)