#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# ansible-adapter — adapter between Ansible and reclass
#
# Copyright © 2007–13 martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
import os, sys, posix, stat

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

if len(sys.argv) == 1:
    exit_error('Need to specify --list or --host.', posix.EX_USAGE)

ansible_dir = os.path.dirname(sys.argv[0])

# 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 reclass, config, errors

# The adapter resides in the Ansible directory, so let's look there for an
# optional configuration file called reclass-config.yml.
options = {'output':'json', 'pretty_print':True}
config_path = os.path.join(ansible_dir, 'reclass-config.yml')
if os.path.exists(config_path) and os.access(config_path, os.R_OK):
    options.update(config.read_config_file(config_path))

# Massage options into shape
if 'storage_type' not in options:
    options['storage_type'] = 'yaml_fs'

if 'nodes_uri' not in options:
    nodes_uri = os.path.join(ansible_dir, 'nodes')
    if stat.S_ISDIR(os.stat(nodes_uri).st_mode):
        options['nodes_uri'] = nodes_uri
    else:
        exit_error('nodes_uri not specified', posix.EX_USAGE)

if 'classes_uri' not in options:
    classes_uri = os.path.join(ansible_dir, 'classes')
    if not stat.S_ISDIR(os.stat(classes_uri).st_mode):
        classes_uri = options['nodes_uri']
    options['classes_uri'] = classes_uri

if 'applications_postfix' not in options:
    options['applications_postfix'] = '_hosts'

# Invoke reclass according to what Ansible wants.
# If the 'node' option is set, we want node information. If the option is
# False instead, we print the inventory. Yeah for option abuse!
if sys.argv[1] == '--list':
    if len(sys.argv) > 2:
        exit_error('Unknown arguments: ' + ' '.join(sys.argv[2:]),
                    posix.EX_USAGE)
    options['node'] = False

elif sys.argv[1] == '--host':
    if len(sys.argv) < 3:
        exit_error('Missing hostname.', posix.EX_USAGE)
    elif len(sys.argv) > 3:
        exit_error('Unknown arguments: ' + ' '.join(sys.argv[3:]),
                    posix.EX_USAGE)
    options['node'] = sys.argv[2]

else:
    exit_error('Unknown mode (--list or --host required).', posix.EX_USAGE)

try:
    data = reclass.get_data(options['storage_type'], options['nodes_uri'],
                            options['classes_uri'],
                            options['applications_postfix'], options['node'])

    if options['node']:
        # Massage and shift the data like Ansible wants it
        data['parameters']['RECLASS'] = data['RECLASS']
        for i in ('classes', 'applications'):
            data['parameters']['RECLASS'][i] = data[i]
        data = data['parameters']

    print reclass.output(data, options['output'], options['pretty_print'])

    sys.exit(posix.EX_OK)

except errors.ReclassException, e:
    exit_error(e.message, e.rc)