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#! /usr/bin/python2

# Authors:
#   Petr Viktorin <pviktori@redhat.com>
#
# Copyright (C) 2013  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import print_function

import sys
import os
import argparse
import json

from ipalib.constants import FQDN
from ipatests.test_integration import config, env_config


def main(argv):
    parser = argparse.ArgumentParser(
    description='Prints out IPA test configuration for use in shell scripts.'
        'IPA integration tests are configured via environment variables')

    parser.add_argument('host', nargs='?',
                        help='Print config for the given hostname')

    parser.add_argument('--global', action='store_true', dest='global_',
                        help='Print global config (not specific to a host '
                             'or domain)')

    parser.add_argument('--domain',
                        help='IPA domain name, or number (the X in _envX)')

    parser.add_argument('--master',
                        help='Print config for the master',
                        action='store_true')

    parser.add_argument('--replica', type=int,
                        help='Print config for the replica with this number')

    parser.add_argument('--client', type=int,
                        help='Print config for the client with this number')

    parser.add_argument('--role', type=str,
                        help='Print config for machine with this role')

    parser.add_argument('--no-simple', dest='simple', action='store_false',
                        help='Do not print Simple Vars '
                             '(normally included backwards-compatibility)')

    parser.add_argument('--yaml', action='store_const', dest='output_format',
                        const='yaml',
                        help='Output configuration in YAML format')

    parser.add_argument('--json', action='store_const', dest='output_format',
                        const='json',
                        help='Output configuration in JSON format')

    args = parser.parse_args(argv)

    hostsargs = [bool(args.host), bool(args.master), bool(args.replica),
             bool(args.client)]
    if hostsargs.count(True) > 1:
        parser.error('Must specify at most one of host selection options')
    if any(hostsargs) or args.domain:
        if args.global_:
            parser.error('--global may not be combined with host selection options')
    else:
        args.host = FQDN

    kwargs = {}
    if not args.simple:
        kwargs['simple'] = False

    conf = config.Config.from_env(os.environ)

    if args.output_format == 'json':
        return json.dumps(conf.to_dict(), indent=2)
    elif args.output_format == 'yaml':
        import yaml
        return yaml.safe_dump(conf.to_dict(), default_flow_style=False)
    else:
        env = get_object(conf, args).to_env(**kwargs)
        return env_config.env_to_script(env)


def get_object(conf, args):
    if args.global_:
        return conf
    elif args.host:
        try:
            return conf.host_by_name(args.host)
        except LookupError:
            exit('Host %s not found in config. Try --global' % args.host)
    else:
        if args.domain:
            try:
                num = int(args.domain) - 1
            except ValueError:
                domains = [d for d in conf.domains if d.name == args.domain]
                if not domains:
                    exit('Domain %s not found' % args.domain)
                domain = domains[0]
            else:
                try:
                    domain = conf.domains[num]
                except LookupError:
                    exit('Domain %s not found.' % args.domain)
        else:
            try:
                domain = conf.domains[0]
            except IndexError:
                exit('No domains are configured.')
        if args.master:
            return domain.master

        elif args.replica:
            num = int(args.replica) - 1
            try:
                return domain.replicas[args.replica]
            except LookupError:
                exit('Domain %s not found in domain %s' % (args.replica,
                                                           domain.name))

        elif args.client:
            num = int(args.client) - 1
            try:
                return domain.replicas[args.client]
            except LookupError:
                exit('Client %s not found in domain %s' % (args.client,
                                                           domain.name))

        elif args.role:
            try:
                return domain.get_host_by_role(args.role)
            except LookupError:
                exit('No host with role %s not found in domain %s'
                     % (args.role, domain.name))

        else:
            return domain


if __name__ == '__main__':
    print(main(sys.argv[1:]), end=' ')