# -*- coding: utf-8 -*-
'''
Manage RabbitMQ Clusters
========================

Example:

.. code-block:: yaml

    rabbit@rabbit.example.com:
      rabbitmq_cluster.join:
        - user: rabbit
        - host: rabbit.example.com
'''
from __future__ import absolute_import, unicode_literals, print_function

# Import python libs
import logging

# Import salt libs
import salt.utils.functools
import salt.utils.path

log = logging.getLogger(__name__)


def __virtual__():
    '''
    Only load if RabbitMQ is installed.
    '''
    return salt.utils.path.which('rabbitmqctl') is not None


def joined(name, host, user='rabbit', ram_node=None, runas='root'):
    '''
    Ensure the current node joined to a cluster with node user@host

    name
        Irrelevant, not used (recommended: user@host)
    user
        The user of node to join to (default: rabbit)
    host
        The host of node to join to
    ram_node
        Join node as a RAM node
    runas
        The user to run the rabbitmq command as
    '''

    ret = {'name': name, 'result': True, 'comment': '', 'changes': {}}

    status = __salt__['rabbitmq.cluster_status']()
    if '{0}@{1}'.format(user, host) in status:
        ret['comment'] = 'Already in cluster'
        return ret

    if not __opts__['test']:
        result = __salt__['rabbitmq.join_cluster'](host,
                                                   user,
                                                   ram_node,
                                                   runas=runas)
        if 'Error' in result:
            ret['result'] = False
            ret['comment'] = result['Error']
            return ret
        elif 'Join' in result:
            ret['comment'] = result['Join']

    # If we've reached this far before returning, we have changes.
    ret['changes'] = {'old': '', 'new': '{0}@{1}'.format(user, host)}

    if __opts__['test']:
        ret['result'] = None
        ret['comment'] = 'Node is set to join cluster {0}@{1}'.format(
            user, host)

    return ret


# Alias join to preserve backward compat
join = salt.utils.functools.alias_function(joined, 'join')