import base64
from collections import OrderedDict
import requests

# noinspection PyUnresolvedReferences
try:
    #  python 3
    from urllib.request import urlopen, Request
    from urllib.parse import urlencode, parse_qs
except ImportError:
    #  python 2
    from urllib import urlencode
    from urllib2 import urlopen, Request
    from cgi import parse_qs


class DirectAdminClient:

    def __init__(self, url, username, password):

        self.version = "0.0.5"
        self.client = requests.session()
        self.headers = {'user-agent': 'pyDirectAdmin/' + str(self.version),
                        'Authorization': 'Basic %s' % base64.b64encode(("%s:%s" %
                                                                        (username, password))
                                                                       .encode()).decode('utf8'),
                        }
        self.url = url

    def make_request(self, endpoint, data=None):
        response = None  # Empty response variable

        if data is not None:
            #  Data is present add the fields to call
            response = urlopen(
                Request(
                    "%s?%s" % (self.url + '/{}'.format(endpoint), urlencode(data)),
                    headers=self.headers,
                )
            )
        elif data is None:
            #  Data is not present so we don't need addition field.
            response = urlopen(
                Request(
                    "%s?" % (self.url + '/{}'.format(endpoint)),
                    headers=self.headers,
                )
            )

        return response

    @staticmethod
    def __process_response__(response):
        if int(response['error'][0]) > 0:
            # There was an error
            raise DirectAdminClientException(response['text'][0])
        elif int(response['error'][0]) == 0:
            # Everything succeeded
            return {'error': response['error'][0],
                    'message': response['text'][0]
                    }

    def login_test(self):
        r = self.make_request('CMD_API_LOGIN_TEST')
        response = parse_qs(r.read().decode('utf8'),
                         keep_blank_values=0,
                         strict_parsing=1)
        
        return self.__process_response__(response)

    def get_domain_list(self):
        r = self.make_request('CMD_API_SHOW_DOMAINS')

        domains = parse_qs(r.read().decode('utf8'),
                           keep_blank_values=0,
                           strict_parsing=1)
        response = list()
        for domain in domains.values():
            response.append(domain[0])
        return response

    def get_zone_list(self, domain):
        params = OrderedDict([('domain', domain)])
        r = self.make_request('CMD_API_DNS_CONTROL', params)

        return r.read()

    def add_dns_record(self, domain, record_type, record_name, record_value, record_ttl=None):

        params = OrderedDict([('domain', domain),
                              ('action', 'add'),
                              ('type', record_type.upper()),
                              ('name', record_name),
                              ('value', record_value)])

        if record_ttl is not None:
            # Non-default is specified so we should add on the record
            params.update({'ttl': record_ttl})

        response = self.make_request('CMD_API_DNS_CONTROL', data=params)
        response = parse_qs(response.read().decode('utf8'),
                            keep_blank_values=0,
                            strict_parsing=1)

        return self.__process_response__(response)

    def update_dns_record(self, domain, record_type, record_name, record_value_old, record_value_new, record_ttl=None):

        params = OrderedDict([('domain', domain),
                              ('action', 'edit'),
                              ('type', record_type.upper()),
                              (record_type.lower() + "recs0", 'name={}&value={}'.format(record_name, record_value_old)),
                              ('name', record_name),
                              ('value', record_value_new)])

        if record_ttl is not None:
            # Non-default is specified so we should add on the record
            params.update({'ttl': record_ttl})

        response = self.make_request('CMD_API_DNS_CONTROL', data=params)
        response = parse_qs(response.read().decode('utf8'),
                            keep_blank_values=0,
                            strict_parsing=1)

        return self.__process_response__(response)

    def delete_dns_record(self, domain, record_type, record_name, record_value):
        params = OrderedDict([('domain', domain),
                              ('action', 'select'),
                              (record_type.lower() + "recs0", 'name={}&value={}'.format(record_name, record_value))
                              ])

        response = self.make_request('CMD_API_DNS_CONTROL', data=params)
        response = parse_qs(response.read().decode('utf8'),
                            keep_blank_values=0,
                            strict_parsing=1)

        return self.__process_response__(response)

    def override_domain_ttl(self, domain, record_name, ttl):
        params = OrderedDict([('domain', domain),
                              ('action', 'ttl'),
                              ('ttl_select', 'custom'),
                              ('name', record_name),
                              ('ttl', ttl)])

        response = self.make_request('CMD_API_DNS_CONTROL', data=params)
        response = parse_qs(response.read().decode('utf8'),
                            keep_blank_values=0,
                            strict_parsing=1)

        return self.__process_response__(response)


class DirectAdminClientException(Exception):
    pass