#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2013, Peter Sprygada <sprygada@gmail.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function
__metaclass__ = type


ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}


DOCUMENTATION = '''
---
module: ejabberd_user
version_added: "1.5"
author: "Peter Sprygada (@privateip)"
short_description: Manages users for ejabberd servers
requirements:
    - ejabberd with mod_admin_extra
description:
    - This module provides user management for ejabberd servers
options:
    username:
        description:
            - the name of the user to manage
        required: true
    host:
        description:
            - the ejabberd host associated with this username
        required: true
    password:
        description:
            - the password to assign to the username
        required: false
    logging:
        description:
            - enables or disables the local syslog facility for this module
        required: false
        default: false
        type: bool
    state:
        description:
            - describe the desired state of the user to be managed
        required: false
        default: 'present'
        choices: [ 'present', 'absent' ]
notes:
    - Password parameter is required for state == present only
    - Passwords must be stored in clear text for this release
    - The ejabberd configuration file must include mod_admin_extra as a module.
'''
EXAMPLES = '''
# Example playbook entries using the ejabberd_user module to manage users state.

- name: create a user if it does not exist
  ejabberd_user:
    username: test
    host: server
    password: password

- name: delete a user if it exists
  ejabberd_user:
    username: test
    host: server
    state: absent
'''

import syslog

from ansible.module_utils.basic import AnsibleModule


class EjabberdUserException(Exception):
    """ Base exception for EjabberdUser class object """
    pass


class EjabberdUser(object):
    """ This object represents a user resource for an ejabberd server.   The
    object manages user creation and deletion using ejabberdctl.  The following
    commands are currently supported:
        * ejabberdctl register
        * ejabberdctl deregister
    """

    def __init__(self, module):
        self.module = module
        self.logging = module.params.get('logging')
        self.state = module.params.get('state')
        self.host = module.params.get('host')
        self.user = module.params.get('username')
        self.pwd = module.params.get('password')

    @property
    def changed(self):
        """ This method will check the current user and see if the password has
        changed.   It will return True if the user does not match the supplied
        credentials and False if it does not
        """
        try:
            options = [self.user, self.host, self.pwd]
            (rc, out, err) = self.run_command('check_password', options)
        except EjabberdUserException:
            (rc, out, err) = (1, None, "required attribute(s) missing")
        return rc

    @property
    def exists(self):
        """ This method will check to see if the supplied username exists for
        host specified.  If the user exists True is returned, otherwise False
        is returned
        """
        try:
            options = [self.user, self.host]
            (rc, out, err) = self.run_command('check_account', options)
        except EjabberdUserException:
            (rc, out, err) = (1, None, "required attribute(s) missing")
        return not bool(int(rc))

    def log(self, entry):
        """ This method will log information to the local syslog facility """
        if self.logging:
            syslog.openlog('ansible-%s' % self.module._name)
            syslog.syslog(syslog.LOG_NOTICE, entry)

    def run_command(self, cmd, options):
        """ This method will run the any command specified and return the
        returns using the Ansible common module
        """
        if not all(options):
            raise EjabberdUserException

        cmd = 'ejabberdctl %s ' % cmd
        cmd += " ".join(options)
        self.log('command: %s' % cmd)
        return self.module.run_command(cmd.split())

    def update(self):
        """ The update method will update the credentials for the user provided
        """
        try:
            options = [self.user, self.host, self.pwd]
            (rc, out, err) = self.run_command('change_password', options)
        except EjabberdUserException:
            (rc, out, err) = (1, None, "required attribute(s) missing")
        return (rc, out, err)

    def create(self):
        """ The create method will create a new user on the host with the
        password provided
        """
        try:
            options = [self.user, self.host, self.pwd]
            (rc, out, err) = self.run_command('register', options)
        except EjabberdUserException:
            (rc, out, err) = (1, None, "required attribute(s) missing")
        return (rc, out, err)

    def delete(self):
        """ The delete method will delete the user from the host
        """
        try:
            options = [self.user, self.host]
            (rc, out, err) = self.run_command('unregister', options)
        except EjabberdUserException:
            (rc, out, err) = (1, None, "required attribute(s) missing")
        return (rc, out, err)


def main():
    module = AnsibleModule(
        argument_spec=dict(
            host=dict(default=None, type='str'),
            username=dict(default=None, type='str'),
            password=dict(default=None, type='str', no_log=True),
            state=dict(default='present', choices=['present', 'absent']),
            logging=dict(default=False, type='bool')
        ),
        supports_check_mode=True
    )

    obj = EjabberdUser(module)

    rc = None
    result = dict(changed=False)

    if obj.state == 'absent':
        if obj.exists:
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = obj.delete()
            if rc != 0:
                module.fail_json(msg=err, rc=rc)

    elif obj.state == 'present':
        if not obj.exists:
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = obj.create()
        elif obj.changed:
            if module.check_mode:
                module.exit_json(changed=True)
            (rc, out, err) = obj.update()
        if rc is not None and rc != 0:
            module.fail_json(msg=err, rc=rc)

    if rc is None:
        result['changed'] = False
    else:
        result['changed'] = True

    module.exit_json(**result)


if __name__ == '__main__':
    main()