#!/usr/bin/env python3
#
# Copyright (C) 2019 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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/>.
#
#

import sys
import argparse

import vyos.hostsd_client

parser = argparse.ArgumentParser(allow_abbrev=False)
group = parser.add_mutually_exclusive_group()

group.add_argument('--add-name-servers', type=str, nargs='*')
group.add_argument('--delete-name-servers', action='store_true')
group.add_argument('--get-name-servers', type=str, const='.*', nargs='?')

group.add_argument('--add-name-server-tags-recursor', type=str, nargs='*')
group.add_argument('--delete-name-server-tags-recursor', type=str, nargs='*')
group.add_argument('--get-name-server-tags-recursor', action='store_true')

group.add_argument('--add-name-server-tags-system', type=str, nargs='*')
group.add_argument('--delete-name-server-tags-system', type=str, nargs='*')
group.add_argument('--get-name-server-tags-system', action='store_true')

group.add_argument('--add-forward-zone', type=str, nargs='?')
group.add_argument('--delete-forward-zones', type=str, nargs='*')
group.add_argument('--get-forward-zones', action='store_true')

group.add_argument('--add-search-domains', type=str, nargs='*')
group.add_argument('--delete-search-domains', action='store_true')
group.add_argument('--get-search-domains', type=str, const='.*', nargs='?')

group.add_argument('--add-hosts', type=str, nargs='*')
group.add_argument('--delete-hosts', action='store_true')
group.add_argument('--get-hosts', type=str, const='.*', nargs='?')

group.add_argument('--set-host-name', type=str)

# for --set-host-name
parser.add_argument('--domain-name', type=str)

# for forward zones
parser.add_argument('--nameservers', type=str, nargs='*')
parser.add_argument('--addnta', action='store_true')
parser.add_argument('--recursion-desired', action='store_true')

parser.add_argument('--tag', type=str)

# users must call --apply either in the same command or after they're done
parser.add_argument('--apply', action="store_true")

args = parser.parse_args()

try:
    client = vyos.hostsd_client.Client()
    ops = 1

    if args.add_name_servers:
        if not args.tag:
            raise ValueError("--tag is required for this operation")
        client.add_name_servers({args.tag: args.add_name_servers})
    elif args.delete_name_servers:
        if not args.tag:
            raise ValueError("--tag is required for this operation")
        client.delete_name_servers([args.tag])
    elif args.get_name_servers:
        print(client.get_name_servers(args.get_name_servers))

    elif args.add_name_server_tags_recursor:
        client.add_name_server_tags_recursor(args.add_name_server_tags_recursor)
    elif args.delete_name_server_tags_recursor:
        client.delete_name_server_tags_recursor(args.delete_name_server_tags_recursor)
    elif args.get_name_server_tags_recursor:
        print(client.get_name_server_tags_recursor())

    elif args.add_name_server_tags_system:
        client.add_name_server_tags_system(args.add_name_server_tags_system)
    elif args.delete_name_server_tags_system:
        client.delete_name_server_tags_system(args.delete_name_server_tags_system)
    elif args.get_name_server_tags_system:
        print(client.get_name_server_tags_system())

    elif args.add_forward_zone:
        if not args.nameservers:
            raise ValueError("--nameservers is required for this operation")
        client.add_forward_zones(
                { args.add_forward_zone: {
                    'server': args.nameservers,
                    'addnta': args.addnta,
                    'recursion_desired': args.recursion_desired
                    }
                })
    elif args.delete_forward_zones:
        client.delete_forward_zones(args.delete_forward_zones)
    elif args.get_forward_zones:
        print(client.get_forward_zones())

    elif args.add_search_domains:
        if not args.tag:
            raise ValueError("--tag is required for this operation")
        client.add_search_domains({args.tag: args.add_search_domains})
    elif args.delete_search_domains:
        if not args.tag:
            raise ValueError("--tag is required for this operation")
        client.delete_search_domains([args.tag])
    elif args.get_search_domains:
        print(client.get_search_domains(args.get_search_domains))

    elif args.add_hosts:
        if not args.tag:
            raise ValueError("--tag is required for this operation")
        data = {}
        for h in args.add_hosts:
            entry = {}
            params = h.split(",")
            if len(params) < 2:
                raise ValueError("Malformed host entry")
            # Address needs to be a list because of changes made in T2683
            entry['address'] = [params[1]]
            entry['aliases'] = params[2:]
            data[params[0]] = entry
        client.add_hosts({args.tag: data})
    elif args.delete_hosts:
        if not args.tag:
            raise ValueError("--tag is required for this operation")
        client.delete_hosts([args.tag])
    elif args.get_hosts:
        print(client.get_hosts(args.get_hosts))

    elif args.set_host_name:
        if not args.domain_name:
            raise ValueError('--domain-name is required for this operation')
        client.set_host_name({'host_name': args.set_host_name, 'domain_name': args.domain_name})

    elif args.apply:
        pass
    else:
        ops = 0

    if args.apply:
        client.apply()

    if ops == 0:
        raise ValueError("Operation required")

except ValueError as e:
    print("Incorrect options: {0}".format(e))
    sys.exit(1)
except vyos.hostsd_client.VyOSHostsdError as e:
    print("Server returned an error: {0}".format(e))
    sys.exit(1)