#!/usr/bin/python

DOCUMENTATION = '''
---
module: rhn_channel
short_description: Define Red Hat software channels
description:
    - Adds or removes Red Hat software channels on a system
version_added: 1.0
author: Vincent Van der Kussen
notes:
    - this module fetches the systemid from rhn. A function 
      to use the local systemid is provided (get_localsystem)
      but not integrated
    - Username and password are currently hardcoded in the main
      section
requirements:
    - none
options:
    name:
        description
            - name of the software channel
        required: true
        default: null
    sysname:
        description:
            - name of the system as it is known in rhn/sattelite
        required: true
        default: null
    url:
        description: 
            - The full url to the rhn/sattelite api
        required: true
        default: https://rhn.redhat.com/rpc/api
    user:
        description:
            - the user to login to rhn/sattelite
        required: true
    pwd:
        description:
            - the user's password
        required: true
examples:
    - code: rhn_channel name=rhel-x86_64-server-v2vwin-6  sysname=server01
      url=https://rhn.redhat.com/rpc/api user=rhnuser pwd=guessme
      description: add software channel rhel-x86_64-server-v2vwin-6 
                   to server01 in Red Hat Network
'''

import xmlrpclib
from operator import itemgetter
import re


# ------------------------------------------------------- #

def get_systemid(client, session, sysname):
    systems = client.system.listUserSystems(session)
    for system in systems:
        if system.get('name') == sysname:
            idres = system.get('id')
            idd = int(idres)
            return idd

# ------------------------------------------------------- #

def get_localsystemid():
    f = open("/etc/sysconfig/rhn/systemid", "r")
    content = f.read()
    loc_id = re.search(r'\b(ID-)(\d{10})' ,content)
    return loc_id.group(2)

# ------------------------------------------------------- #

def subscribe_channels(channels, client, session, sysname, sys_id):
    c = base_channels(client, session, sys_id)
    c.append(channels)
    return client.channel.software.setSystemChannels(session, sys_id, c)

# ------------------------------------------------------- #

def unsubscribe_channels(channels, client, session, sysname, sys_id):
    c = base_channels(client, session, sys_id)
    c.remove(channels)
    return client.channel.software.setSystemChannels(session, sys_id, c)

# ------------------------------------------------------- #

def base_channels(client, session, sys_id):
    basechan = client.channel.software.listSystemChannels(session, sys_id)
    chans = [item['channel_label'] for item in basechan]
    return chans

# ------------------------------------------------------- #


def main():

    module = AnsibleModule(
        argument_spec = dict(
            state = dict(default='present', choices=['present', 'absent']),
            name = dict(required=True),
            sysname = dict(required=True),
            url = dict(required=True),
            user = dict(required=True),
            pwd = dict(required=True),
        )
#        supports_check_mode=True
    )

    state = module.params['state']
    channelname = module.params['name']
    systname = module.params['sysname']
    saturl = module.params['url']
    user = module.params['user']
    pwd = module.params['pwd']
    
    #initialize connection
    client = xmlrpclib.Server(saturl, verbose=0)
    session = client.auth.login(user, pwd)
     
    # get systemid
    sys_id = get_systemid(client, session, systname)

    # get channels for system
    chans = base_channels(client, session, sys_id)
    
    
    if state == 'present':
        if channelname in chans:
            module.exit_json(changed=False, msg="Channel %s already exists" % channelname)

        else:
            subscribe_channels(channelname, client, session, systname, sys_id)
            module.exit_json(changed=True, msg="Channel %s added" % channelname)

    if state == 'absent':
        if not channelname in chans:
            module.exit_json(changed=False, msg="Not subscribed to channel %s." % channelname)
        else:
            unsubscribe_channels(channelname, client, session, systname, sys_id)
            module.exit_json(changed=True, msg="Channel %s removed" % channelname)

    client.auth.logout(session)


# include magic from lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()