from django.db import models
from django.db.models import Manager
from typing import Dict, Optional, Text

import zerver.models
import datetime

def get_remote_server_by_uuid(uuid):
    # type: (Text) -> RemoteZulipServer
    return RemoteZulipServer.objects.get(uuid=uuid)

class RemoteZulipServer(models.Model):
    uuid = models.CharField(max_length=36, unique=True)  # type: Text
    api_key = models.CharField(max_length=64)  # type: Text

    hostname = models.CharField(max_length=128, unique=True)  # type: Text
    contact_email = models.EmailField(blank=True, null=False)  # type: Text
    last_updated = models.DateTimeField('last updated', auto_now=True)  # type: datetime.datetime

# Variant of PushDeviceToken for a remote server.
class RemotePushDeviceToken(zerver.models.AbstractPushDeviceToken):
    server = models.ForeignKey(RemoteZulipServer)  # type: RemoteZulipServer
    # The user id on the remote server for this device device this is
    user_id = models.BigIntegerField()  # type: int

class Deployment(models.Model):
    realms = models.ManyToManyField(zerver.models.Realm,
                                    related_name="_deployments")  # type: Manager
    is_active = models.BooleanField(default=True)  # type: bool

    # TODO: This should really become the public portion of a keypair, and
    # it should be settable only with an initial bearer "activation key"
    api_key = models.CharField(max_length=32, null=True)  # type: Text

    base_api_url = models.CharField(max_length=128)  # type: Text
    base_site_url = models.CharField(max_length=128)  # type: Text

    @property
    def endpoints(self):
        # type: () -> Dict[str, Text]
        return {'base_api_url': self.base_api_url, 'base_site_url': self.base_site_url}

    @property
    def name(self):
        # type: () -> Text

        # TODO: This only does the right thing for prod because prod authenticates to
        # staging with the zulip.com deployment key, while staging is technically the
        # deployment for the zulip.com realm.
        # This also doesn't necessarily handle other multi-realm deployments correctly
        return self.realms.order_by('pk')[0].domain