# -*- coding: utf-8 -*-
'''
Modify, retrieve, or delete values from OpenStack configuration files.

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

'''
# Import Python libs
from __future__ import absolute_import, print_function, unicode_literals
import shlex

try:
    import pipes
    HAS_DEPS = True
except ImportError:
    HAS_DEPS = False

if hasattr(shlex, 'quote'):
    _quote = shlex.quote
elif HAS_DEPS and hasattr(pipes, 'quote'):
    _quote = pipes.quote
else:
    _quote = None

# Import Salt libs
from salt.ext import six
import salt.utils.decorators.path
import salt.exceptions

# Don't shadow built-in's.
__func_alias__ = {
    'set_': 'set'
}


def __virtual__():
    if _quote is None and not HAS_DEPS:
        return False
    return True


def _fallback(*args, **kw):
    return 'The "openstack-config" command needs to be installed for this function to work.  Typically this is included in the "openstack-utils" package.'


@salt.utils.decorators.path.which('openstack-config')
def set_(filename, section, parameter, value):
    '''
    Set a value in an OpenStack configuration file.

    filename
        The full path to the configuration file

    section
        The section in which the parameter will be set

    parameter
        The parameter to change

    value
        The value to set

    CLI Example:

    .. code-block:: bash

        salt-call openstack_config.set /etc/keystone/keystone.conf sql connection foo
    '''

    filename = _quote(filename)
    section = _quote(section)
    parameter = _quote(parameter)
    value = _quote(six.text_type(value))

    result = __salt__['cmd.run_all'](
            'openstack-config --set {0} {1} {2} {3}'.format(
                filename, section, parameter, value
                ),
            python_shell=False,
            )

    if result['retcode'] == 0:
        return result['stdout']
    else:
        raise salt.exceptions.CommandExecutionError(result['stderr'])


@salt.utils.decorators.path.which('openstack-config')
def get(filename, section, parameter):
    '''
    Get a value from an OpenStack configuration file.

    filename
        The full path to the configuration file

    section
        The section from which to search for the parameter

    parameter
        The parameter to return

    CLI Example:

    .. code-block:: bash

        salt-call openstack_config.get /etc/keystone/keystone.conf sql connection

    '''

    filename = _quote(filename)
    section = _quote(section)
    parameter = _quote(parameter)

    result = __salt__['cmd.run_all'](
            'openstack-config --get {0} {1} {2}'.format(
                filename, section, parameter
                ),
            python_shell=False,
            )

    if result['retcode'] == 0:
        return result['stdout']
    else:
        raise salt.exceptions.CommandExecutionError(result['stderr'])


@salt.utils.decorators.path.which('openstack-config')
def delete(filename, section, parameter):
    '''
    Delete a value from an OpenStack configuration file.

    filename
        The full path to the configuration file

    section
        The section from which to delete the parameter

    parameter
        The parameter to delete

    CLI Example:

    .. code-block:: bash

        salt-call openstack_config.delete /etc/keystone/keystone.conf sql connection
    '''

    filename = _quote(filename)
    section = _quote(section)
    parameter = _quote(parameter)

    result = __salt__['cmd.run_all'](
            'openstack-config --del {0} {1} {2}'.format(
                filename, section, parameter
                ),
            python_shell=False,
            )

    if result['retcode'] == 0:
        return result['stdout']
    else:
        raise salt.exceptions.CommandExecutionError(result['stderr'])