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

import os
import re
import subprocess
import sys
from kapisi_lib import *

rolepath='../roles/Chappaai/files'
dnsfilepath=rolepath+"/dns"
dhcpfilepath=rolepath+"/dhcp"
entryset={}

def WriteDHCPEntries(replica_domain,dhcpfile):
    ### Create the DHCP 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 entryset
    for host in entryset:
        # Entries should be:
        # dhcp-host=mac,ip,fqdn
        dhcpfile.write('dhcp-host=' + entryset[host][1] + ',' + entryset[host][0] + ',' + host + '.' + replica_domain + '\n')

def WriteDNSEntries(replica_domain,dnsfile):
    ### Create the DNS 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 entryset
    for host in entryset:
        # Entries should be:
        # ip host fqdn
        dnsfile.write(entryset[host][0] + ' ' + host + '.' + replica_domain + ' ' + host + '\n')

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

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

    # Parse the yaml
    with open(file, 'r') as stream:
        content = yaml.safe_load(stream)
        replica_domain = content['all']['vars']['replica_domain']
        external_domain = content['all']['vars']['external_domain']

        # Clear the DNS file
        with open(dhcpfilepath,'w') as dhcpfile:
            dhcpfile.write('dhcp-range='+content['all']['vars']['dhcprange']+'\n')
            dhcpfile.write('dhcp-option=option:dns-server,'+content['all']['vars']['dns']+'\n\n')
            dhcpfile.write('dhcp-range='+content['all']['vars']['staticrange']+'\n')
            WriteDHCPEntries(replica_domain,dhcpfile)
        with open(dnsfilepath,'w') as dnsfile:
            dnsfile.write(content['all']['vars']['webfront']+' '+external_domain+' '+content['all']['vars']['external_subdomains'].replace(' ','.'+external_domain+' ')+'.'+external_domain+' '+content['all']['vars']['hosted_domains']+"\n")
            WriteDNSEntries(replica_domain,dnsfile)
            print('Files should be in '+rolepath);

### Main function
# param sys.argv: Input arguments
if __name__ == '__main__':
    if len(sys.argv) < 2:
        print("You need to supply an inventory file.")
        sys.exit(1)
    if len(sys.argv) == 3:
        entryset = TrackIPEntries(sys.argv[1],sys.argv[2])
    else:
        entryset = TrackIPEntries(sys.argv[1])
    GenerateFiles(sys.argv[1])
    #dumper.dump(entryset)
    sys.exit(0)