# -*- coding: utf-8 -*-
'''
Manage OpenStack configuration file settings.

:maintainer: Jeffrey C. Ollie <jeff@ocjtech.us>
:maturity: new
:depends:
:platform: linux

'''

# Import Python Libs
from __future__ import absolute_import

# Import Salt Libs
from salt.exceptions import CommandExecutionError


def __virtual__():
    '''
    Only load if the openstack_config module is in __salt__
    '''
    if 'openstack_config.get' not in __salt__:
        return False
    if 'openstack_config.set' not in __salt__:
        return False
    if 'openstack_config.delete' not in __salt__:
        return False
    return True


def present(name, filename, section, value, parameter=None):
    '''
    Ensure a value is set in an OpenStack configuration file.

    filename
        The full path to the configuration file

    section
        The section in which the parameter will be set

    parameter (optional)
        The parameter to change.  If the parameter is not supplied, the name will be used as the parameter.

    value
        The value to set

    '''

    if parameter is None:
        parameter = name

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

    try:
        old_value = __salt__['openstack_config.get'](filename=filename,
                                                     section=section,
                                                     parameter=parameter)

        if old_value == value:
            ret['result'] = True
            ret['comment'] = 'The value is already set to the correct value'
            return ret

        if __opts__['test']:
            ret['result'] = None
            ret['comment'] = 'Value \'{0}\' is set to be changed to \'{1}\'.'.format(
                old_value,
                value
            )
            return ret

    except CommandExecutionError as e:
        if not str(e).lower().startswith('parameter not found:'):
            raise

    __salt__['openstack_config.set'](filename=filename,
                                     section=section,
                                     parameter=parameter,
                                     value=value)

    ret['changes'] = {'Value': 'Updated'}
    ret['result'] = True
    ret['comment'] = 'The value has been updated'

    return ret


def absent(name, filename, section, parameter=None):
    '''
    Ensure a value is not set in an OpenStack configuration file.

    filename
        The full path to the configuration file

    section
        The section in which the parameter will be set

    parameter (optional)
        The parameter to change.  If the parameter is not supplied, the name will be used as the parameter.

    '''

    if parameter is None:
        parameter = name

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

    try:
        old_value = __salt__['openstack_config.get'](filename=filename,
                                                     section=section,
                                                     parameter=parameter)
    except CommandExecutionError as e:
        if str(e).lower().startswith('parameter not found:'):
            ret['result'] = True
            ret['comment'] = 'The value is already absent'
            return ret
        raise

    if __opts__['test']:
        ret['result'] = None
        ret['comment'] = 'Value \'{0}\' is set to be deleted.'.format(
            old_value
        )
        return ret

    __salt__['openstack_config.delete'](filename=filename,
                                        section=section,
                                        parameter=parameter)

    ret['changes'] = {'Value': 'Deleted'}
    ret['result'] = True
    ret['comment'] = 'The value has been deleted'

    return ret
