#!/usr/bin/env python3

# Copyright (C) 2009-2022 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 Dict, Any

from twisted.words.xish import domish

from libervia.backend.core.constants import Const as C
from libervia.backend.core.i18n import _
from libervia.backend.core.log import getLogger
from libervia.backend.core import exceptions
from libervia.backend.tools import utils

log = getLogger(__name__)


PLUGIN_INFO = {
    C.PI_NAME: "User Location",
    C.PI_IMPORT_NAME: "XEP-0080",
    C.PI_TYPE: "XEP",
    C.PI_MODES: C.PLUG_MODE_BOTH,
    C.PI_PROTOCOLS: ["XEP-0080"],
    C.PI_MAIN: "XEP_0080",
    C.PI_HANDLER: "no",
    C.PI_DESCRIPTION: _("""Implementation of XEP-0080 (User Location)"""),
}

NS_GEOLOC = "http://jabber.org/protocol/geoloc"
KEYS_TYPES = {
    "accuracy": float,
    "alt": float,
    "altaccuracy": float,
    "area": str,
    "bearing": float,
    "building": str,
    "country": str,
    "countrycode": str,
    "datum": str,
    "description": str,
    "error": float,
    "floor": str,
    "lat": float,
    "locality": str,
    "lon": float,
    "postalcode": str,
    "region": str,
    "room": str,
    "speed": float,
    "street": str,
    "text": str,
    "timestamp": "datetime",
    "tzo": str,
    "uri": str
}


class XEP_0080:

    def __init__(self, host):
        log.info(_("XEP-0080 (User Location) plugin initialization"))
        host.register_namespace("geoloc", NS_GEOLOC)

    def get_geoloc_elt(
        self,
        location_data: Dict[str, Any],
    ) -> domish.Element:
        """Generate the element describing the location

        @param geoloc: metadata description the location
            Keys correspond to ones found at
            https://xmpp.org/extensions/xep-0080.html#format, with following additional
            keys:
                - id (str): Identifier for this location
                - language (str): language of the human readable texts
            All keys are optional.
        @return: ``<geoloc/>`` element
        """
        geoloc_elt = domish.Element((NS_GEOLOC, "geoloc"))
        for key, value in location_data.items():
            try:
                key_type = KEYS_TYPES[key]
            except KeyError:
                if key == "id":
                    # "id" attribute is not specified for XEP-0080's <geoloc/> element,
                    # but it may be used in a parent element (that's the case for events)
                    pass
                elif key == "language":
                    geoloc_elt["xml:lang"] = value
                else:
                    log.warning(f"Unknown location key {key}: {location_data}")
                continue
            if key_type == "datetime":
                content = utils.xmpp_date(value)
            else:
                content = str(value)
            geoloc_elt.addElement(key, content=content)

        return geoloc_elt

    def parse_geoloc_elt(
        self,
        geoloc_elt: domish.Element
    ) -> Dict[str, Any]:
        """Parse <geoloc/> element

        @param geoloc_elt: <geoloc/> element
            a parent element can also be used
        @return: geoloc data. It's a dict whose keys correspond to
            [get_geoloc_elt] parameters
        @raise exceptions.NotFound: no <geoloc/> element has been found
        """

        if geoloc_elt.name != "geoloc":
            try:
                geoloc_elt = next(geoloc_elt.elements(NS_GEOLOC, "geoloc"))
            except StopIteration:
                raise exceptions.NotFound
        data: Dict[str, Any] = {}
        for elt in geoloc_elt.elements():
            if elt.uri != NS_GEOLOC:
                log.warning(f"unmanaged geoloc element: {elt.toXml()}")
                continue
            try:
                data_type = KEYS_TYPES[elt.name]
            except KeyError:
                log.warning(f"unknown geoloc element: {elt.toXml()}")
                continue
            try:
                if data_type == "datetime":
                    data[elt.name] = utils.parse_xmpp_date(str(elt))
                else:
                    data[elt.name] = data_type(str(elt))
            except Exception as e:
                log.warning(f"can't parse element: {elt.toXml()}")
                continue

        return data