"""Provider module for CloudNS"""
from __future__ import absolute_import

import logging

import requests

from lexicon.providers.base import Provider as BaseProvider

LOGGER = logging.getLogger(__name__)

NAMESERVER_DOMAINS = ["cloudns.net"]


def provider_parser(subparser):
    """Configure provider parser for CloudNS"""
    identity_group = subparser.add_mutually_exclusive_group()
    identity_group.add_argument("--auth-id", help="specify user id for authentication")
    identity_group.add_argument(
        "--auth-subid", help="specify subuser id for authentication"
    )
    identity_group.add_argument(
        "--auth-subuser", help="specify subuser name for authentication"
    )
    subparser.add_argument(
        "--auth-password", help="specify password for authentication"
    )
    subparser.add_argument("--weight", help="specify the SRV record weight")
    subparser.add_argument("--port", help="specify the SRV record port")


class Provider(BaseProvider):
    """Provider class for CloudNS"""

    def __init__(self, config):
        super(Provider, self).__init__(config)
        self.domain_id = None
        self.api_endpoint = "https://api.cloudns.net"

    def _authenticate(self):
        payload = self._get("/dns/get-zone-info.json", {"domain-name": self.domain})
        self.domain_id = payload["name"]
        LOGGER.debug("authenticate: %s", payload)

    def _create_record(self, rtype, name, content):
        # Skip execution if such a record already exists
        existing_records = self._list_records(rtype, name, content)
        if existing_records:
            return True

        # Build parameters for adding a new record
        params = {
            "domain-name": self.domain_id,
            "record-type": rtype,
            "host": self._relative_name(name),
            "record": content,
        }
        if self._get_lexicon_option("ttl"):
            params["ttl"] = self._get_lexicon_option("ttl")
        if self._get_lexicon_option("priority"):
            params["priority"] = self._get_lexicon_option("priority")
        if self._get_provider_option("weight"):
            params["weight"] = self._get_lexicon_option("weight")
        if self._get_provider_option("port"):
            params["port"] = self._get_lexicon_option("port")

        # Add new record by calling the ClouDNS API
        payload = self._post("/dns/add-record.json", params)
        LOGGER.debug("create_record: %s", payload)

        # Error handling is already covered by self._request
        return True

    def _list_records(self, rtype=None, name=None, content=None):
        # Build parameters to make use of the built-in API filtering
        params = {"domain-name": self.domain_id}
        if rtype:
            params["type"] = rtype
        if name:
            params["host"] = self._relative_name(name)

        # Fetch and parse all records for the given zone
        payload = self._get("/dns/records.json", params)
        payload = payload if not isinstance(payload, list) else {}
        records = []
        for record in payload.values():
            records.append(
                {
                    "type": record["type"],
                    "name": self._full_name(record["host"]),
                    "ttl": record["ttl"],
                    "content": record["record"],
                    "id": record["id"],
                }
            )

        # Filter by content manually as API does not support that
        if content:
            records = [record for record in records if record["content"] == content]

        # Print records as debug output and return them
        LOGGER.debug("list_records: %s", records)
        return records

    def _update_record(self, identifier, rtype=None, name=None, content=None):
        # Try to find record if no identifier was specified
        if not identifier:
            identifier = self._find_record_identifier(rtype, name, None)

        # Build parameters for updating an existing record
        params = {"domain-name": self.domain_id, "record-id": identifier}
        if name:
            params["host"] = self._relative_name(name)
        if content:
            params["record"] = content
        if self._get_lexicon_option("ttl"):
            params["ttl"] = self._get_lexicon_option("ttl")
        if self._get_lexicon_option("priority"):
            params["priority"] = self._get_lexicon_option("priority")
        if self._get_provider_option("weight"):
            params["weight"] = self._get_provider_option("weight")
        if self._get_provider_option("port"):
            params["port"] = self._get_provider_option("port")

        # Update existing record by calling the ClouDNS API
        payload = self._post("/dns/mod-record.json", params)
        LOGGER.debug("update_record: %s", payload)

        # Error handling is already covered by self._request
        return True

    def _delete_record(self, identifier=None, rtype=None, name=None, content=None):
        # Try to find record if no identifier was specified
        delete_record_id = []
        if not identifier:
            records = self._list_records(rtype, name, content)
            delete_record_id = [record["id"] for record in records]
        else:
            delete_record_id.append(identifier)

        LOGGER.debug("delete_records: %s", delete_record_id)

        for record_id in delete_record_id:
            # Delete existing record by calling the ClouDNS API
            self._post(
                "/dns/delete-record.json",
                {"domain-name": self.domain_id, "record-id": record_id},
            )

        LOGGER.debug("delete_record: %s", True)

        # Error handling is already covered by self._request
        return True

    def _build_authentication_data(self):
        if not self._get_provider_option("auth_password"):
            raise Exception(
                "No valid authentication data passed, expected: auth-password"
            )

        if self._get_provider_option("auth_id"):
            return {
                "auth-id": self._get_provider_option("auth_id"),
                "auth-password": self._get_provider_option("auth_password"),
            }
        if self._get_provider_option("auth_subid"):
            return {
                "sub-auth-id": self._get_provider_option("auth_subid"),
                "auth-password": self._get_provider_option("auth_password"),
            }
        if self._get_provider_option("auth_subuser"):
            return {
                "sub-auth-user": self._get_provider_option("auth_subuser"),
                "auth-password": self._get_provider_option("auth_password"),
            }
        if (
            self._get_provider_option("auth_id")
            or self._get_provider_option("auth_subid")
            or self._get_provider_option("auth_subuser")
        ):
            # All the options were passed with a fallback value, return an empty dictionary.
            return {}
        raise Exception(
            "No valid authentication data passed, expected: auth-id, auth-subid, auth-subuser"
        )

    def _find_record_identifier(self, rtype, name, content):
        records = self._list_records(rtype, name, content)
        LOGGER.debug("records: %s", records)
        if len(records) == 1:
            return records[0]["id"]
        raise Exception("Record identifier could not be found.")

    def _request(self, action="GET", url="/", data=None, query_params=None):
        # Set default values for missing arguments
        data = data if data else {}
        query_params = query_params if query_params else {}

        # Merge authentication data into request
        if action == "GET":
            query_params.update(self._build_authentication_data())
        else:
            data.update(self._build_authentication_data())

        # Fire request against ClouDNS API and parse result as JSON
        response = requests.request(
            action, self.api_endpoint + url, params=query_params, data=data
        )
        response.raise_for_status()
        payload = response.json()

        # Check ClouDNS specific status code and description
        if (
            "status" in payload
            and "statusDescription" in payload
            and payload["status"] != "Success"
        ):
            raise Exception(
                "ClouDNS API request has failed: " + payload["statusDescription"]
            )

        # Return payload
        return payload
