import sys
import ipaddress
from configparser import ConfigParser
import json
import copy
import CloudFlare


class DNSUpdater:
    def __init__(self, args):
        # Parse config
        config = ConfigParser()
        config.read('config.ini')

        self.HOSTNAME = config['server']['HOSTNAME']
        __TOKEN = config['cloudflare']['TOKEN']

        # Parse args
        try:
            ipversion = args[1].lstrip('-')
            ipaddress_new = args[2]
        except IndexError:
            ipaddress_new = ''
            ipversion = 'skip'

        match ipversion:
            case '4': self.IPVER = 'ipv4'
            case '6': self.IPVER = 'ipv6'
            case 'skip': self.IPVER = ipversion
            case other: raise ValueError(f"Wrong IP Address version given: {ipversion}")
        
        self.IPNEW = ipaddress_new

        # Cloudflare class
        self._cloudflare = CloudFlare.CloudFlare(token=__TOKEN)

        with open('cloudflare.json', 'r') as file:
            self.dns_replacements = json.load(file)
    
    def get_zones(self):
        # Cloudflare get zones from API token
        zones = self._cloudflare.zones.get()
        for zone in zones:
            self.zone_id = zone['id']
            self.zone_name = zone['name']
            print(f"Zone ID: {zone['id']} | Zone Name: {zone['name']}")

    def get_dns_records(self, log=False):
        dns_records_all = self._cloudflare.zones.dns_records.get(self.zone_id)

        dns_records_to_update = {'A' : [], 'AAAA' : []}
        for dnsrecord in dns_records_all:
            if dnsrecord['type'] in ['A', 'AAAA']:
                if log:
                    print(f"DNS Name: {dnsrecord['name']} | Type : {dnsrecord['type']} | IP: {dnsrecord['content']}")
                dns_records_to_update[dnsrecord['type']].append(dnsrecord)
            else:
                if log:
                    print(f"| Unknow DNS | Type: {dnsrecord['type']} | Zone: {dnsrecord['name']}")

        self.DNSRECORDS = copy.deepcopy(dns_records_to_update)
    
    def update_records(self):
        if self.IPVER == 'skip':
            self.get_dns_records(log=True)
            return

        self.get_dns_records()

        ipinformation = {
            'ipv4': [ipaddress.IPv4Address, 'A'],
            'ipv6': [ipaddress.IPv6Address, 'AAAA']
        }

        print(f"Updating IP of version {self.IPVER}")
        assert isinstance(ipaddress.ip_address(self.IPNEW), ipinformation[self.IPVER][0]), f'IP {self.IPNEW} is not a valid IPv6 address'
        dnstype = ipinformation[self.IPVER][1]

        names_replace = self.dns_replacements[dnstype]
        print(names_replace)
        for name in names_replace:
            if (name == "@"):
                fullname = self.HOSTNAME
            else:
                fullname = f"{name}.{self.HOSTNAME}"

            for record in self.DNSRECORDS[dnstype]:
                if record['name'] == fullname:
                    new_dnsrecord = {"name": fullname, "type": dnstype, "content": self.IPNEW}
                    print(f"Sending request {new_dnsrecord}")
                    res = self._cloudflare.zones.dns_records.patch(self.zone_id, record['id'], data=new_dnsrecord)
                    if res['content'] != new_dnsrecord['content']:
                        print(res)
                              


if __name__ == '__main__':
    dnsupdate = DNSUpdater(sys.argv)
    dnsupdate.get_zones()
    dnsupdate.update_records()