#!/usr/bin/env python3


# SàT plugin for Software Version (XEP-0092)
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from typing import Tuple

from twisted.internet import defer, reactor
from twisted.words.protocols.jabber import jid
from wokkel import compat

from libervia.backend.core import exceptions
from libervia.backend.core.constants import Const as C
from libervia.backend.core.core_types import SatXMPPEntity
from libervia.backend.core.i18n import _
from libervia.backend.core.log import getLogger

log = getLogger(__name__)

NS_VERSION = "jabber:iq:version"
TIMEOUT = 10

PLUGIN_INFO = {
    C.PI_NAME: "Software Version Plugin",
    C.PI_IMPORT_NAME: "XEP-0092",
    C.PI_TYPE: "XEP",
    C.PI_PROTOCOLS: ["XEP-0092"],
    C.PI_DEPENDENCIES: [],
    C.PI_RECOMMENDATIONS: [C.TEXT_CMDS],
    C.PI_MAIN: "XEP_0092",
    C.PI_HANDLER: "no",  # version is already handler in core.xmpp module
    C.PI_DESCRIPTION: _("""Implementation of Software Version"""),
}


class XEP_0092(object):
    def __init__(self, host):
        log.info(_("Plugin XEP_0092 initialization"))
        self.host = host
        host.bridge.add_method(
            "software_version_get",
            ".plugin",
            in_sign="ss",
            out_sign="(sss)",
            method=self._get_version,
            async_=True,
        )
        try:
            self.host.plugins[C.TEXT_CMDS].add_who_is_cb(self._whois, 50)
        except KeyError:
            log.info(_("Text commands not available"))

    def _get_version(self, entity_jid_s, profile_key):
        def prepare_for_bridge(data):
            name, version, os = data
            return (name or "", version or "", os or "")

        client = self.host.get_client(profile_key)
        d = self.version_get(client, jid.JID(entity_jid_s))
        d.addCallback(prepare_for_bridge)
        return d

    def version_get(
        self,
        client: SatXMPPEntity,
        jid_: jid.JID,
    ) -> Tuple[str, str, str]:
        """Ask version of the client that jid_ is running

        @param jid_: jid from who we want to know client's version
        @return: a defered which fire a tuple with the following data (None if not available):
            - name: Natural language name of the software
            - version: specific version of the software
            - os: operating system of the queried entity
        """

        def do_version_get(__):
            iq_elt = compat.IQ(client.xmlstream, "get")
            iq_elt["to"] = jid_.full()
            iq_elt.addElement("query", NS_VERSION)
            d = iq_elt.send()
            d.addCallback(self._got_version)
            return d

        d = self.host.check_feature(client, NS_VERSION, jid_)
        d.addCallback(do_version_get)
        reactor.callLater(
            TIMEOUT, d.cancel
        )  # XXX: timeout needed because some clients don't answer the IQ
        return d

    def _got_version(self, iq_elt):
        try:
            query_elt = next(iq_elt.elements(NS_VERSION, "query"))
        except StopIteration:
            raise exceptions.DataError
        ret = []
        for name in ("name", "version", "os"):
            try:
                data_elt = next(query_elt.elements(NS_VERSION, name))
                ret.append(str(data_elt))
            except StopIteration:
                ret.append(None)

        return tuple(ret)

    def _whois(self, client, whois_msg, mess_data, target_jid):
        """Add software/OS information to whois"""

        def version_cb(version_data):
            name, version, os = version_data
            if name:
                whois_msg.append(_("Client name: %s") % name)
            if version:
                whois_msg.append(_("Client version: %s") % version)
            if os:
                whois_msg.append(_("Operating system: %s") % os)

        def version_eb(failure):
            failure.trap(exceptions.FeatureNotFound, defer.CancelledError)
            if failure.check(failure, exceptions.FeatureNotFound):
                whois_msg.append(_("Software version not available"))
            else:
                whois_msg.append(_("Client software version request timeout"))

        d = self.version_get(client, target_jid)
        d.addCallbacks(version_cb, version_eb)
        return d