# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
OnApp DNS Driver
"""

__all__ = [
    'OnAppDNSDriver'
]

import json

from libcloud.common.onapp import OnAppConnection
from libcloud.dns.types import Provider, RecordType
from libcloud.dns.base import DNSDriver, Zone, Record


DEFAULT_ZONE_TTL = 1200


class OnAppDNSDriver(DNSDriver):
    type = Provider.ONAPP
    name = 'OnApp'
    website = 'http://onapp.com/'
    connectionCls = OnAppConnection

    RECORD_TYPE_MAP = {
        RecordType.SOA: 'SOA',
        RecordType.NS: 'NS',
        RecordType.A: 'A',
        RecordType.AAAA: 'AAAA',
        RecordType.CNAME: 'CNAME',
        RecordType.MX: 'MX',
        RecordType.TXT: 'TXT',
        RecordType.SRV: 'SRV',
    }

    def list_zones(self):
        """
        Return a list of zones.

        :return: ``list`` of :class:`Zone`
        """
        response = self.connection.request('/dns_zones.json')

        zones = self._to_zones(response.object)
        return zones

    def get_zone(self, zone_id):
        """
        Return a Zone instance.

        :param zone_id: ID of the required zone
        :type  zone_id: ``str``

        :rtype: :class:`Zone`
        """
        response = self.connection.request('/dns_zones/%s.json' % zone_id)
        zone = self._to_zone(response.object)
        return zone

    def create_zone(self, domain, type='master', ttl=None, extra=None):
        """
        Create a new zone.

        :param domain: Zone domain name (e.g. example.com)
        :type domain: ``str``

        :param type: Zone type (All zones are master by design).
        :type  type: ``str``

        :param ttl: TTL for new records. (This is not really used)
        :type  ttl: ``int``

        :param extra: Extra attributes (set auto_populate: 0 if you
        don't want to auto populate with existing DNS records). (optional)
        :type extra: ``dict``

        :rtype: :class:`Zone`

        For more info, please see:
        https://docs.onapp.com/display/52API/Add+DNS+Zone
        """
        dns_zone = {'name': domain}
        if extra is not None:
            dns_zone.update(extra)
        dns_zone_data = json.dumps({'dns_zone': dns_zone})
        response = self.connection.request(
            '/dns_zones.json',
            method='POST',
            headers={"Content-type": "application/json"},
            data=dns_zone_data)
        zone = self._to_zone(response.object)
        return zone

    def delete_zone(self, zone):
        """
        Delete a zone.

        Note: This will also delete all the records belonging to this zone.

        :param zone: Zone to delete.
        :type  zone: :class:`Zone`

        :rtype: ``bool``
        """
        self.connection.request(
            '/dns_zones/%s.json' % zone.id,
            method='DELETE')
        return True

    def list_records(self, zone):
        """
        Return a list of records for the provided zone.

        :param zone: Zone to list records for.
        :type zone: :class:`Zone`

        :return: ``list`` of :class:`Record`
        """
        response = self.connection.request(
            '/dns_zones/%s/records.json' % zone.id)
        dns_records = response.object['dns_zone']['records']
        records = self._to_records(dns_records, zone)
        return records

    def get_record(self, zone_id, record_id):
        """
        Return a Record instance.

        :param zone_id: ID of the required zone
        :type  zone_id: ``str``

        :param record_id: ID of the required record
        :type  record_id: ``str``

        :rtype: :class:`Record`
        """
        response = self.connection.request('/dns_zones/%s/records/%s.json' %
                                           (zone_id, record_id))
        record = self._to_record(response.object, zone_id=zone_id)
        return record

    def create_record(self, name, zone, type, data, extra=None):
        """
        Create a new record.

        :param name: Record name without the domain name (e.g. www).
                     Note: If you want to create a record for a base domain
                     name, you should specify empty string ('') for this
                     argument.
        :type  name: ``str``

        :param zone: Zone where the requested record is created.
        :type  zone: :class:`Zone`

        :param type: DNS record type (A, AAAA, ...).
        :type  type: :class:`RecordType`

        :param data: Data for the record (depends on the record type).
        Used only for A and AAAA record types.
        :type  data: ``str``

        :param extra: Extra attributes (driver specific). (optional)
        :type extra: ``dict``

        :rtype: :class:`Record`

        For more info, please see:
        https://docs.onapp.com/display/52API/Add+DNS+Record
        """
        dns_record = self._format_record(name, type, data, extra)
        dns_record_data = json.dumps({'dns_record': dns_record})
        response = self.connection.request(
            '/dns_zones/%s/records.json' % zone.id,
            method='POST',
            headers={"Content-type": "application/json"},
            data=dns_record_data)
        record = self._to_record(response.object, zone=zone)
        return record

    def update_record(self, record, name, type, data, extra=None):
        """
        Update an existing record.

        :param record: Record to update.
        :type  record: :class:`Record`

        :param name: Record name without the domain name (e.g. www).
                     Note: If you want to create a record for a base domain
                     name, you should specify empty string ('') for this
                     argument.
        :type  name: ``str``

        :param type: DNS record type (A, AAAA, ...).
        :type  type: :class:`RecordType`

        :param data: Data for the record (depends on the record type).
        Used only for A and AAAA record types.
        :type  data: ``str``

        :param extra: (optional) Extra attributes (driver specific).
        :type  extra: ``dict``

        :rtype: :class:`Record`

        For more info, please see:
        https://docs.onapp.com/display/52API/Edit+DNS+Records
        """
        zone = record.zone
        dns_record = self._format_record(name, type, data, extra)
        dns_record_data = json.dumps({'dns_record': dns_record})
        self.connection.request(
            '/dns_zones/%s/records/%s.json' % (zone.id, record.id),
            method='PUT',
            headers={"Content-type": "application/json"},
            data=dns_record_data)
        record = self.get_record(zone.id, record.id)
        return record

    def delete_record(self, record):
        """
        Delete a record.

        :param record: Record to delete.
        :type  record: :class:`Record`

        :rtype: ``bool``

        For more info, please see:
        https://docs.onapp.com/display/52API/Delete+DNS+Record
        """
        zone_id = record.zone.id
        self.connection.request('/dns_zones/%s/records/%s.json' % (zone_id,
                                record.id), method='DELETE')
        return True

    #
    # Helper methods
    #

    def _format_record(self, name, type, data, extra):
        if name is '':
            name = '@'
        if extra is None:
            extra = {}
        record_type = self.RECORD_TYPE_MAP[type]
        new_record = {
            'name': name,
            'ttl': extra.get('ttl', DEFAULT_ZONE_TTL),
            'type': record_type
        }
        if type == RecordType.MX:
            additions = {
                'priority': extra.get('priority', 1),
                'hostname': extra.get('hostname')
            }
        elif type == RecordType.SRV:
            additions = {
                'port': extra.get('port'),
                'weight': extra.get('weight', 1),
                'priority': extra.get('priority', 1),
                'hostname': extra.get('hostname')
            }
        elif type == RecordType.A:
            additions = {'ip': data}
        elif type == RecordType.CNAME:
            additions = {'hostname': extra.get('hostname')}
        elif type == RecordType.AAAA:
            additions = {'ip': data}
        elif type == RecordType.TXT:
            additions = {'txt': extra.get('txt')}
        elif type == RecordType.NS:
            additions = {'hostname': extra.get('hostname')}

        new_record.update(additions)
        return new_record

    def _to_zones(self, data):
        zones = []
        for zone in data:
            _zone = self._to_zone(zone)
            zones.append(_zone)

        return zones

    def _to_zone(self, data):
        dns_zone = data.get('dns_zone')
        id = dns_zone.get('id')
        name = dns_zone.get('name')
        extra = {'user_id': dns_zone.get('user_id'),
                 'cdn_reference': dns_zone.get('cdn_reference'),
                 'created_at': dns_zone.get('created_at'),
                 'updated_at': dns_zone.get('updated_at')}

        type = 'master'

        return Zone(id=id, domain=name, type=type, ttl=DEFAULT_ZONE_TTL,
                    driver=self, extra=extra)

    def _to_records(self, data, zone):
        records = []
        data = data.values()
        for data_type in data:
            for item in data_type:
                record = self._to_record(item, zone=zone)
                records.append(record)
        records.sort(key=lambda x: x.id, reverse=False)
        return records

    def _to_record(self, data, zone_id=None, zone=None):
        if not zone:  # We need zone_id or zone
            zone = self.get_zone(zone_id)
        record = data.get('dns_record')
        id = record.get('id')
        name = record.get('name')
        type = record.get('type')
        ttl = record.get('ttl', None)
        return Record(id=id, name=name, type=type, data=record, zone=zone,
                      driver=self, ttl=ttl, extra={})
