#!/usr/bin/env python3

# Libervia plugin to jingle session publishing.
# Copyright (C) 2009-2026 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 TYPE_CHECKING, Final, Self

from pydantic import BaseModel
from twisted.words.protocols.jabber import jid
from twisted.words.protocols.jabber.xmlstream import XMPPHandler
from twisted.words.xish import domish
from tx_xmpp import disco, itx_xmpp, pubsub
from zope.interface import implementer

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
from libervia.backend.plugins.plugin_xep_0234 import NS_JINGLE_FT
from libervia.backend.plugins.plugin_xep_0358 import JinglePub
from libervia.backend.plugins.plugin_xep_0446 import FileMetadata
from libervia.backend.plugins.plugin_xep_0447 import FileSharing, JinglePubSource

if TYPE_CHECKING:
    from libervia.backend.core.main import LiberviaBackend

log = getLogger(__name__)


PLUGIN_INFO = {
    C.PI_NAME: "Pubsub File Sharing",
    C.PI_IMPORT_NAME: "XEP-0498",
    C.PI_TYPE: "XEP",
    C.PI_MODES: C.PLUG_MODE_BOTH,
    C.PI_PROTOCOLS: [],
    C.PI_DEPENDENCIES: [
        "XEP-0060",
        "XEP-0447",
    ],
    C.PI_RECOMMENDATIONS: [],
    C.PI_MAIN: "XEP_0498",
    C.PI_HANDLER: "yes",
    C.PI_DESCRIPTION: _("""Share and retrieve files via Pubsub."""),
}

NS_PUBSUB_FILE_SHARING: Final = "urn:xmpp:pubsub-file-sharing:0"


class NodeData(BaseModel):
    """Model for JinglePub element."""

    files: dict[str, FileSharing]

    def to_elements(self) -> list[domish.Element]:
        """Return the list of item elements corresponding to this model"""
        items = []
        for item_id, file_sharing in self.files.items():
            item_elt = pubsub.Item(id=item_id, payload=file_sharing.to_element())
            items.append(item_elt)

        return items

    @classmethod
    def from_files_data(cls, source_jid: jid.JID, files_data: list[dict]) -> Self:
        """Generate from list of file data as returned by ``memory.get_files``.

        @param files_data: list of files data as returned by ``memory.get_files``.
        @return: Instance of ``NodeData``.
        """
        kw = {}
        for file_data in files_data:
            file_metadata = FileMetadata.from_filedata_dict(file_data)
            source = JinglePubSource(
                from_jid=source_jid,
                id=file_data["id"],
                descriptions=[domish.Element((NS_JINGLE_FT, "description"))],
            )
            # We don't know if names are unique, so we add ID to be sure.
            key = f'{file_data["name"]}_{file_data["id"]}'
            kw[key] = FileSharing(file=file_metadata, sources=[source])

        return cls(files=kw)


class XEP_0498:
    namespace = NS_PUBSUB_FILE_SHARING

    def __init__(self, host: "LiberviaBackend") -> None:
        log.info(f"plugin {PLUGIN_INFO[C.PI_NAME]!r} initialization")
        self.host = host
        host.register_namespace("pubsub-file-sharing", NS_PUBSUB_FILE_SHARING)

    def get_handler(self, client: SatXMPPEntity) -> XMPPHandler:
        return PubsubFileSharingHandler(self)


@implementer(itx_xmpp.IDisco)
class PubsubFileSharingHandler(XMPPHandler):

    def __init__(self, plugin_parent):
        self.plugin_parent = plugin_parent

    def getDiscoInfo(
        self, requestor: jid.JID, target: jid.JID, nodeIdentifier: str = ""
    ) -> list[disco.DiscoFeature]:
        return [
            disco.DiscoFeature(NS_PUBSUB_FILE_SHARING),
        ]

    def getDiscoItems(
        self, requestor: jid.JID, target: jid.JID, nodeIdentifier: str = ""
    ) -> list[disco.DiscoItems]:
        return []