#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# salt-adapter — adapter between Salt and reclass
#
# Note that this file is not really necessary and exists mostly for debugging
# purposes and admin joys. Have a look at README.Salt for proper integration
# between Salt and reclass.
#
# Copyright © 2007–13 martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
__name__ = 'salt-reclass'
__description__ = 'reclass adapter for Salt'
__version__ = '1.0'
__author__ = 'martin f. krafft <madduck@madduck.net>'
__copyright__ = 'Copyright © 2007–13 ' + __author__
__licence__ = 'Artistic Licence 2.0'

import sys, os, posix

# In order to be able to use reclass as modules, manipulate the search
# path, starting from the location of the adapter. Realpath will make
# sure that symlinks are resolved.
realpath = os.path.realpath(sys.argv[0] + '/../../')
sys.path.insert(0, realpath)

import os, sys, posix
import reclass.config
from reclass.output import OutputLoader
from reclass.storage import StorageBackendLoader
from reclass.errors import ReclassException, InvocationError
from reclass import output
from reclass.adapters.salt import ext_pillar, top

def _error(msg, rc):
    print >>sys.stderr, msg
    sys.exit(rc)

try:
    if len(sys.argv) == 1:
        raise InvocationError('Need to specify --top or --pillar.',
                                posix.EX_USAGE)

    # initialise options and try to read ./reclass-config.yml, which is
    # expected to sit next to the salt-reclass CLI
    options = {'storage_type': 'yaml_fs',
               'pretty_print' : True,
               'output' : 'yaml'
              }
    basedir = os.path.dirname(sys.argv[0])
    config_path = os.path.join(basedir, 'reclass-config.yml')
    if os.path.exists(config_path) and os.access(config_path, os.R_OK):
        options.update(reclass.config.read_config_file(config_path))

    nodes_uri, classes_uri = reclass.config.path_mangler(options.get('inventory_base_uri'),
                                                         options.get('nodes_uri'),
                                                         options.get('classes_uri'))
    options['nodes_uri'] = nodes_uri
    options['classes_uri'] = classes_uri

    if sys.argv[1] in ('--top', '-t'):
        if len(sys.argv) > 2:
            raise InvocationError('Unknown arguments: ' + \
                                ' '.join(sys.argv[2:]), posix.EX_USAGE)
        node = False

    elif sys.argv[1] in ('--pillar', '-p'):
        if len(sys.argv) < 3:
            raise InvocationError('Missing hostname.', posix.EX_USAGE)
        elif len(sys.argv) > 3:
            raise InvocationError('Unknown arguments: ' + \
                                ' '.join(sys.argv[3:]), posix.EX_USAGE)
        node = sys.argv[2]

    else:
        raise InvocationError('Unknown mode (--top or --pillar required).',
                              posix.EX_USAGE)

    if not node:
        reclass_opts = options.copy()
        del reclass_opts['output']
        del reclass_opts['pretty_print']
        data = top(**reclass_opts)

    else:
        pillar={}
        data = ext_pillar(node, pillar, options.get('storage_type'),
                          options.get('inventory_base_uri'),
                          options.get('nodes_uri'),
                          options.get('classes_uri'))

    print output(data, options.get('output'), options.get('pretty_print'))
    sys.exit(posix.EX_OK)

except ReclassException, e:
    _error(e.message, e.rc)