#!/usr/bin/env python
# -*- coding: utf-8 -*-

# (c) 2012, Stephen Fromm <sfromm@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

DOCUMENTATION = '''
---
module: group
author: Stephen Fromm
version_added: 0.0.2
short_description: Add or remove groups
requirements: [ groupadd, groupdel, groupmod ]
description:
    - Manage presence of groups on a host.
options:
    name:
        required: true
        description:
            - Name of the group to manage.
    gid:
        required: false
        description:
            - Optional I(GID) to set for the group.
    state:
        required: false
        default: "present"
        choices: [ present, absent ]
        description:
            - Whether the group should be present or not on the remote host.
    system:
        required: false
        default: "no"
        choices: [ yes, no ]
        description:
            - If I(yes), indicates that the group created is a system group.
examples:
    - code: group name=somegroup state=present
      description: Example group command from Ansible Playbooks

'''

import grp

def group_del(module, group):
    cmd = [module.get_bin_path('groupdel', True), group]
    p = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (out, err) = p.communicate()
    rc = p.returncode
    return (rc, out, err)

def group_add(module, group, **kwargs):
    cmd = [module.get_bin_path('groupadd', True)]
    for key in kwargs:
        if key == 'gid' and kwargs[key] is not None:
            cmd.append('-g')
            cmd.append(kwargs[key])
        elif key == 'system' and kwargs[key] == 'yes':
            cmd.append('-r')
    cmd.append(group)
    p = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (out, err) = p.communicate()
    rc = p.returncode
    return (rc, out, err)

def group_mod(module, group, **kwargs):
    cmd = [module.get_bin_path('groupmod', True)]
    info = group_info(group)
    for key in kwargs:
        if key == 'gid':
            if kwargs[key] is not None and info[2] != int(kwargs[key]):
                cmd.append('-g')
                cmd.append(kwargs[key])
    if len(cmd) == 1:
        return (None, '', '')
    cmd.append(group)
    p = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    (out, err) = p.communicate()
    rc = p.returncode
    return (rc, out, err)

def group_exists(group):
    try:
        if grp.getgrnam(group):
            return True
    except KeyError:
        return False

def group_info(group):
    if not group_exists(group):
        return False
    try:
        info = list(grp.getgrnam(group))
    except KeyError:
        return False
    return info

# ===========================================

def main():
    module = AnsibleModule(
        argument_spec = dict(
            state=dict(default='present', choices=['present', 'absent']),
            name=dict(required=True),
            gid=dict(default=None),
            system=dict(default='no', choices=['yes', 'no']),
        )
    )

    state = module.params['state']
    name = module.params['name']
    gid = module.params['gid']
    system = module.params['system']
    rc = None
    out = ''
    err = ''
    result = {}
    result['name'] = name
    result['state'] = state
    if state == 'absent':
        if group_exists(name):
            (rc, out, err) = group_del(module, name)
            if rc != 0:
                module.fail_json(name=name, msg=err)
    elif state == 'present':
        if not group_exists(name):
            (rc, out, err) = group_add(module, name, gid=gid, system=system)
        else:
            (rc, out, err) = group_mod(module, name, gid=gid)

        if rc is not None and rc != 0:
            module.fail_json(name=name, msg=err)

    if rc is None:
        result['changed'] = False
    else:
        result['changed'] = True
    if out:
        result['stdout'] = out
    if err:
        result['stderr'] = err

    if group_exists(name):
        info = group_info(name)
        result['system'] = system
        result['gid'] = info[2]

    module.exit_json(**result)

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