#!/usr/bin/env python

# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
# (c) 2013, Serge van Ginderachter <serge@vanginderachter.be>
#
# This file was based on bin/ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

########################################################

import sys
from distutils.version import LooseVersion

import yaml

import ansible.constants as C
from ansible import errors
from ansible import inventory
from ansible import __version__

try:
    # ansible 2.0
    from ansible.cli import SortedOptParser
except ImportError:
    # ansible 1.x
    from ansible.utils import SortedOptParser

try:
    # ansible 2.0
    from ansible.parsing.utils.jsonify import jsonify
    from ansible.parsing.yaml.dumper import AnsibleDumper as Dumper
except ImportError:
    # ansible 1.x
    from ansible.utils import jsonify
    from yaml import SafeDumper as Dumper

ANSIBLE2 = False
if LooseVersion(__version__) >= LooseVersion('2'):
    from ansible.vars import VariableManager
    from ansible.parsing.dataloader import DataLoader
    ANSIBLE2 = True


########################################################

def flatten(terms):
    ret = []
    for term in terms:
        if isinstance(term, list):
            ret.extend(term)
        else:
            ret.append(term)
    return ret 

class Cli(object):

    # ----------------------------------------------

    def __init__(self):
        pass

    # ----------------------------------------------

    def parse(self):
        ''' create an options parser for bin/ansible '''

        parser = SortedOptParser(
            usage='%prog <host-pattern> [options]'
        )
        parser.add_option('-i', '--inventory-file', dest='inventory',
            help="specify inventory host file (default=%s)" % C.DEFAULT_HOST_LIST,
            default=C.DEFAULT_HOST_LIST)
        parser.add_option('--list-hosts', dest='listhosts', action='store_true',
            help="dump out a list of hosts matching input pattern")
        parser.add_option('--list-groups', dest='listgroups', action='store_true',
            help="dump out the list of groups")
        parser.add_option('-l', '--limit', default=C.DEFAULT_SUBSET, dest='subset',
            help='further limit selected hosts to an additional pattern')

        parser.add_option('-y', '--yaml', dest='yaml', action='store_true',
            help="dump out variables in yaml format")

        parser.add_option('-j', '--json', dest='json', action='store_true',
            help="dump out variables in json format (default)")

        options, args = parser.parse_args()
        if len(args) == 0 or len(args) > 1:
            parser.print_help()
            sys.exit(1)
        return (options, args)

    # ----------------------------------------------

    def run(self, options, args):

        pattern = args[0]

        if ANSIBLE2:
            loader = DataLoader()
            variable_manager = VariableManager()
            I = inventory.Inventory(loader=loader,
                    variable_manager=variable_manager,
                    host_list=options.inventory)
        else:
            I = inventory.Inventory(options.inventory)
        if options.subset:
            I.subset(options.subset)
        hosts = I.list_hosts(pattern)
        groups = I.get_groups()
        if len(hosts) == 0:
            print("No hosts matched", file=sys.stderr)
            sys.exit(1)

        if options.listhosts:
            for host in hosts:
                print('%s' % host)
            sys.exit(0)

        if options.listgroups:
            group_subset = []
            for host in hosts:
                group_subset.append(I.groups_for_host(host))
                group_subset = list(set(flatten(group_subset)))
            for group in group_subset:
                parents = group.get_ancestors()
                print('%s (depth %s): parents: %s' % (group.name, group.depth,
                                             [ '%s (depth %s)' % (x.name, x.depth) for x in parents ]))
            sys.exit(0)

        results = { }
        for host in hosts:
            if ANSIBLE2:
                name = host.get_name()
                vars = variable_manager.get_vars(loader, host=host)['vars']
            else:
                name = host
                vars = I.get_variables(host)
            results.update({name: vars})

        return results

########################################################

if __name__ == '__main__':
    cli = Cli()
    (options, args) = cli.parse()
    try:
        results = cli.run(options, args)
    except errors.AnsibleError as e:
        # Generic handler for ansible specific errors
        print("ERROR: %s" % str(e))
        sys.exit(1)
    if options.json and not options.yaml:
        print(jsonify(results, format=True))
    else:
        print(yaml.dump(results, Dumper=Dumper, allow_unicode=True))

