"""Module provider for UKFast's SafeDNS"""
from __future__ import absolute_import
import json
import logging

import requests
from lexicon.providers.base import Provider as BaseProvider

LOGGER = logging.getLogger(__name__)

NAMESERVER_DOMAINS = ['ukfast.net']

def provider_parser(subparser):
    """Configure provider parser for SafeDNS"""
    subparser.description = '''
        SafeDNS provider requires an API key in all interactions.
        You can generate one for your account on the following URL:
        https://my.ukfast.co.uk/applications/index.php'''
    subparser.add_argument('--auth-token', help='specify the API key to authenticate with')

class Provider(BaseProvider):
    """Provider SafeDNS implementation of Lexicon Provider interface."""
    def __init__(self, config):
        super(Provider, self).__init__(config)
        self.domain_id = None
        self.api_endpoint = 'https://api.ukfast.io/safedns/v1'

    def _authenticate(self):
        try:
            self._get('/zones/{0}'.format(self.domain))
            self.domain_id = self.domain
        except requests.exceptions.HTTPError as e:
            if e.response.status_code == 404:
                raise Exception('No domain found')
            raise e

    # List all records. Return an empty list if no records found.
    # type, name and content are used to filter records.
    def _list_records(self, rtype=None, name=None, content=None):
        url = '/zones/{0}/records'.format(self.domain_id)
        records = []
        payload = {}

        # Handle pagination and iteratively collect all records
        next_url = url
        while next_url is not None:
            payload = self._get(next_url)
            if 'meta' in payload \
                    and 'pagination' in payload['meta'] \
                    and 'links' in payload['meta']['pagination'] \
                    and 'next' in payload['meta']['pagination']['links']:
                next_url = payload['meta']['pagination']['links']['next']
            else:
                next_url = None

            # Assign the returned attributes to the keys that lexicon expects
            for record in payload['data']:
                record = self._clean_TXT_record(record)
                processed_record = {
                    'id': record['id'],
                    'name': record['name'],
                    'type': record['type'],
                    'content': record['content'],
                    'updated_at': record['updated_at'],
                    'ttl': record['ttl'],
                    'priority': record['priority']
                }
                records.append(processed_record)

        # This is filtering logic to return only the record which matches what has
        # been passed in to the method
        if rtype:
            records = [
                record for record in records
                if record['type'] == rtype]
        if name:
            records = [
                record for record in records
                # DNS should not be case-sensitive, so perform lower-case comparison
                if record['name'].lower() == self._full_name(name).lower()]
        if content:
            records = [
                record for record in records
                if record['content'].lower() == content.lower()]

        LOGGER.debug('list_records: %s', records)
        return records

    def _create_record(self, rtype, name, content):

        # Check whether the record already exists with the same  rtype, name & content.
        # If so, claim to have added the record, but dont't do anything.
        records = self._list_records(rtype, name, content)
        if records:
            LOGGER.debug('create_record: (ignored, duplicate record): %s', records[0]['id'])
            return True

        # Make sure TXT records are wrapped in quotes
        if content:
            content = self._add_quotes(rtype, content)

        data = {
            'name': self._full_name(name),
            'type': rtype,
            'content': content
        }

        self._post('/zones/{0}/records'.format(self.domain), data)
        LOGGER.debug('create_record: %s', True)
        return True

    def _update_record(self, identifier, rtype=None, name=None, content=None):

        # Make sure the update won't cause a duplicate entry. If it will, fail silently
        records = self._list_records(rtype, name, content)

        if not identifier:
            records = self._list_records(rtype, name)
            if len(records) == 1:
                identifier = records[0]['id']
            elif len(records) > 1:
                identifier = records[0]['id']
                LOGGER.warning(
                    'Warning, multiple records found for given parameters, '
                    'only first one will be updated: %s', records)
            else:
                raise Exception('Record identifier could not be found')

        # Make sure TXT records are wrapped in quotes
        if content:
            content = self._add_quotes(rtype, content)

        data = {}
        if name:
            data['name'] = self._full_name(name)
        if rtype:
            data['type'] = rtype
        if content:
            data['content'] = content

        self._patch(
            '/zones/{0}/records/{1}'.format(self.domain, identifier), data)

        LOGGER.debug('update_record: %s', True)
        return True

    def _delete_record(self, identifier=None, rtype=None, name=None, content=None):

        delete_record_ids = []

        # If we've not been given an identifier, search for matching records.
        # NOTE, this could cause multiple records to be removed.
        if not identifier:
            records = self._list_records(rtype, name, content)
            delete_record_ids = [record['id'] for record in records]
        else:
            delete_record_ids.append(identifier)

        LOGGER.debug('delete_records: %s', delete_record_ids)

        for delete_record_id in delete_record_ids:
            self._delete(
                '/zones/{0}/records/{1}'.format(self.domain, delete_record_id))

        LOGGER.debug('delete_record: %s', True)
        return True

    def _request(self, action='GET', url='/', data=None, query_params=None):
        if data is None:
            data = {}
        if query_params is None:
            query_params = {}
        default_headers = {
            'Accept': 'application/json',
            'Content-Type': 'application/json',
            'Authorization': '{0}'.format(self._get_provider_option('auth_token'))
        }
        if not url.startswith(self.api_endpoint):
            url = self.api_endpoint + url

        response = requests.request(action, url, params=query_params,
                                    data=json.dumps(data),
                                    headers=default_headers)

        # Sort this out to work properly, writing errors to the correct place
        if 'content' in response:
            resp = json.loads(response.content)
            if 'errors' in resp:
                for error in resp['errors']:
                    print("ERROR: " + error['detail'])

        # If the request fails for any reason, throw an error.
        response.raise_for_status()

        # There is no JSON returned when calling with DELETE
        if action != 'DELETE':
            return response.json()

        return True

    # The content of TXT entries must be quoted. This static method ensures that.
    @staticmethod
    def _add_quotes(rtype, content):
        if rtype == 'TXT':
            if not content.startswith('"') and not content.endswith('"'):
                return '"{0}"'.format(content)
        return content

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