#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import argparse
import os
import sys
import json
import requests

import django

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "dnmgmt.settings")
sys.path.append("..")
django.setup()

from django.db.models import Count
from domains.models import Domain, ReverseZone


__VERSION__ = '0.1'


def _parser():
	parser = argparse.ArgumentParser(
	             #prog='foo',
	             #description='do some awesome foo',
	)

	#parser.add_argument("-p", "--port", default=2323, type=int, help="Your port")
	#parser.add_argument("-v", "--verbose", default=False, action="store_true", help="Be more verbose")

	parser.add_argument("--version", action="version", version="%(prog)s " + __VERSION__)

	return parser

def mergeDomains(domains, zoneData):
	rrAdd = []
	rrData = zoneData['rrsets']

	for domain, rrType, records in domains:
		found = False
		pdnsDom = list(filter(lambda _x: _x['name'] == domain and _x['type'] == rrType, rrData))
		if len(pdnsDom) > 0:
			rrSet = set(_x['content'] for _x in pdnsDom[0]['records'])
			if rrSet == set(records):
				found = True

		if not found:
			# new domain!
			rrAdd.append({
				"name": domain,
				"type": rrType,
				"ttl": 60*60,
				"changetype": "REPLACE",
				"records": [{"content": record, "disabled": False} for record in records],
			})

	return rrAdd


def removeOldDomains(domains, zoneData):
	rrDel = []

	for entry in zoneData['rrsets']:
		# search for name/type in domain dict. if non-existtant mark for deletion
		# this could be much more efficient with a dict! name: [rrset...]
		if not any(entry['name'] == _x[0] and entry['type'] == _x[1] for _x in domains):
			rrDel.append({
				"changetype": "DELETE",
				"name": entry["name"],
				"type": entry["type"],
			})

	return rrDel

def handleNameserver(ns, servers, usedNameservers, domains):
	servers.append(ns.name)

	if ns.name not in usedNameservers and (ns.glueIPv4 or ns.glueIPv6):
		usedNameservers.append(ns.name)
		if ns.glueIPv4:
			domains.append((ns.name, "A", [ns.glueIPv4]))
		if ns.glueIPv6:
			domains.append((ns.name, "AAAA", [ns.glueIPv6]))


def main():
	parser = _parser()
	args = parser.parse_args()
	print(args)

	s = requests.Session()
	s.headers = {
		'X-API-Key': 'bei2aequ2OBi',
		'Accept': 'application/json'
	}

	print(" --> TLD dn.")
	zoneData = s.get("http://potatos.portal.dn:8081/api/v1/servers/localhost/zones/dn.").json()

	domains = []
	usedNameservers = []
	qs = Domain.objects.annotate(nsCount=Count('nameservers')).filter(nsCount__gt=0).order_by("name")

	# cycle through all domains
	for domain in qs:
		print("    %s" % (domain.name))
		servers = []
		for ns in domain.nameservers.all():
			servers.append(ns.name)

			if ns.name not in usedNameservers and (ns.glueIPv4 or ns.glueIPv6):
				# FIXME: find dns glue record duplicates in whois webif
				usedNameservers.append(ns.name)
				if ns.glueIPv4:
					domains.append((ns.name, "A", [ns.glueIPv4]))
				if ns.glueIPv6:
					domains.append((ns.name, "AAAA", [ns.glueIPv6]))

		domains.append((domain.name, "NS", servers))

	# cycle through all reverse records
	qs = Domain.objects.annotate(nsCount=Count('nameservers')).filter(nsCount__gt=0).order_by("name")
	for rzone in qs:
		print("    %s" % (rzone.getZone(),))
		servers = []
		for ns in domain.nameservers.all():
			servers.append(ns.name)

			if ns.name not in usedNameservers and (ns.glueIPv4 or ns.glueIPv6):
				# FIXME: find dns glue record duplicates in whois webif
				usedNameservers.append(ns.name)
				if ns.glueIPv4:
					domains.append((ns.name, "A", [ns.glueIPv4]))
				if ns.glueIPv6:
					domains.append((ns.name, "AAAA", [ns.glueIPv6]))

		rzones.append((rzone.getZone, "PTR", servers))
	


	newDomains = mergeDomains(domains, zoneData)
	print("Add/replace", newDomains)
	r = s.patch("http://potatos.portal.dn:8081/api/v1/servers/localhost/zones/dn.", data=json.dumps({'rrsets': newDomains}))
	if r.status_code != 204:
		raise RuntimeError("Could not update records in powerdns")

	# delete old domains (except for NS/SOA of head)
	domains.extend([
		("dn.", "NS", []),
		("dn.", "SOA", []),
	])

	delDomains = removeOldDomains(domains, zoneData)
	print("Del", delDomains)
	r = s.patch("http://potatos.portal.dn:8081/api/v1/servers/localhost/zones/dn.", data=json.dumps({'rrsets': delDomains}))
	if r.status_code != 204:
		raise RuntimeError("Could not update records in powerdns")

	# and now for the reverse zones...
	zoneData = s.get("http://potatos.portal.dn:8081/api/v1/servers/localhost/zones/dn.").json()
	qs = ReverseZone.objects.annotate(nsCount=Count('nameservers')).filter(nsCount__gt=0).order_by("name")

	# cycle through all domains
	for domain in qs:
		print("    %s" % (domain.name))
		servers = []
		for ns in domain.nameservers.all():
			servers.append(ns.name)

			if ns.name not in usedNameservers and (ns.glueIPv4 or ns.glueIPv6):
				# FIXME: find dns glue record duplicates in whois webif
				usedNameservers.append(ns.name)
				if ns.glueIPv4:
					domains.append((ns.name, "A", [ns.glueIPv4]))
				if ns.glueIPv6:
					domains.append((ns.name, "AAAA", [ns.glueIPv6]))

		domains.append((domain.name, "NS", servers))


if __name__ == '__main__':
	main()