import json

from flask import current_app
from lemur import database
from lemur.dns_providers.models import DnsProvider


def render(args):
    """
    Helper that helps us render the REST Api responses.
    :param args:
    :return:
    """
    query = database.session_query(DnsProvider)

    return database.sort_and_page(query, DnsProvider, args)


def get(dns_provider_id):
    provider = database.get(DnsProvider, dns_provider_id)
    return provider


def get_friendly(dns_provider_id):
    """
    Retrieves a dns provider by its lemur assigned ID.

    :param dns_provider_id: Lemur assigned ID
    :rtype : DnsProvider
    :return:
    """
    dns_provider = get(dns_provider_id)
    dns_provider_friendly = {
        "name": dns_provider.name,
        "description": dns_provider.description,
        "providerType": dns_provider.provider_type,
        "options": dns_provider.options,
        "credentials": dns_provider.credentials,
    }

    if dns_provider.provider_type == "route53":
        dns_provider_friendly["account_id"] = json.loads(dns_provider.credentials).get("account_id")
    return dns_provider_friendly


def delete(dns_provider_id):
    """
    Deletes a DNS provider.

    :param dns_provider_id: Lemur assigned ID
    """
    database.delete(get(dns_provider_id))


def get_types():
    provider_config = current_app.config.get('ACME_DNS_PROVIDER_TYPES')
    if not provider_config:
        raise Exception("No DNS Provider configuration specified.")
    provider_config["total"] = len(provider_config.get("items"))
    return provider_config


def create(data):
    provider_name = data.get("name")

    credentials = {}
    for item in data.get("provider_type", {}).get("requirements", []):
        credentials[item["name"]] = item["value"]
    dns_provider = DnsProvider(
        name=provider_name,
        description=data.get("description"),
        provider_type=data.get("provider_type").get("name"),
        credentials=json.dumps(credentials),
    )
    created = database.create(dns_provider)
    return created.id