#!/usr/bin/env python3

# Libervia: an XMPP client
# Copyright (C) 2009-2023 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 twisted.words.xish import domish

from libervia.backend.plugins.plugin_xep_0167.constants import NS_JINGLE_RTP
from libervia.backend.plugins.plugin_xep_0293 import (
    NS_JINGLE_RTP_RTCP_FB,
    RTCP_FB_KEY,
    XEP_0293,
)
from libervia.backend.tools import xml_tools


class TestXEP0293:

    def test_parse_sdp_rtcp_fb_general(self, host):
        """Parsing of a general RTCP feedback SDP line."""
        xep_0293 = XEP_0293(host)

        application_data = {}
        transport_data = {}

        # SDP line: a=rtcp-fb:* nack pli
        attribute = "rtcp-fb"
        parts = ["*", "nack", "pli"]
        xep_0293._parse_sdp_a_trigger(
            attribute=attribute,
            parts=parts,
            call_data={},
            metadata={},
            media_type="video",
            application_data=application_data,
            transport_data=transport_data,
        )
        assert application_data[RTCP_FB_KEY][0] == ("nack", "pli", {})

    def test_parse_sdp_rtcp_fb_specific(self, host):
        """Parsing of a payload-specific RTCP feedback SDP line."""
        xep_0293 = XEP_0293(host)

        application_data = {"payload_types": {96: {}}}
        transport_data = {}

        # SDP line: a=rtcp-fb:96 nack
        attribute = "rtcp-fb"
        parts = ["96", "nack"]
        xep_0293._parse_sdp_a_trigger(
            attribute=attribute,
            parts=parts,
            call_data={},
            metadata={},
            media_type="video",
            application_data=application_data,
            transport_data=transport_data,
        )
        assert application_data["payload_types"][96][RTCP_FB_KEY][0] == ("nack", None, {})

    def test_parse_sdp_rtcp_fb_trr_int_general(self, host):
        """Parsing of a general RTCP feedback with trr-int SDP line."""
        xep_0293 = XEP_0293(host)

        application_data = {}
        transport_data = {}

        # SDP line: a=rtcp-fb-trr-int:* 100
        attribute = "rtcp-fb-trr-int"
        parts = ["*", "100"]
        xep_0293._parse_sdp_a_trigger(
            attribute=attribute,
            parts=parts,
            call_data={},
            metadata={},
            media_type="video",
            application_data=application_data,
            transport_data=transport_data,
        )
        assert application_data["rtcp-fb-trr-int"] == 100

    def test_parse_sdp_rtcp_fb_trr_int_specific(self, host):
        """Parsing of a payload-specific RTCP feedback with trr-int SDP line."""
        xep_0293 = XEP_0293(host)

        application_data = {"payload_types": {96: {}}}
        transport_data = {}

        # SDP line: a=rtcp-fb-trr-int:96 100
        attribute = "rtcp-fb-trr-int"
        parts = ["96", "100"]
        xep_0293._parse_sdp_a_trigger(
            attribute=attribute,
            parts=parts,
            call_data={},
            metadata={},
            media_type="video",
            application_data=application_data,
            transport_data=transport_data,
        )
        assert application_data["payload_types"][96]["rtcp-fb-trr-int"] == 100

    def test_generate_sdp_session(self, host):
        """Generation of SDP lines for session data."""
        xep_0293 = XEP_0293(host)
        sdp_lines = []
        application_data = {RTCP_FB_KEY: [("nack", "pli", {})], "rtcp-fb-trr-int": 100}

        xep_0293._generate_sdp_content_trigger(
            session={},
            local=True,
            content_name="test",
            content_data={},
            sdp_lines=sdp_lines,
            application_data=application_data,
            app_data_key="test",
            media_data={},
            media="video",
        )

        assert sdp_lines[0] == "a=rtcp-fb:* nack pli"
        assert sdp_lines[1] == "a=rtcp-fb:* trr-int 100"

    def test_generate_sdp_payload_type(self, host):
        """Generation of SDP lines for each payload type."""
        xep_0293 = XEP_0293(host)
        sdp_lines = []
        application_data = {}
        media_data = {
            "payload_types": {
                96: {RTCP_FB_KEY: [("nack", None, {})], "rtcp-fb-trr-int": 100}
            }
        }

        xep_0293._generate_sdp_content_trigger(
            session={},
            local=True,
            content_name="test",
            content_data={},
            sdp_lines=sdp_lines,
            application_data=application_data,
            app_data_key="test",
            media_data=media_data,
            media="video",
        )

        assert sdp_lines[0] == "a=rtcp-fb:96 nack"
        assert sdp_lines[1] == "a=rtcp-fb:96 trr-int 100"

    def test_parse_description(self, host):
        """Parsing of <rtcp-fb> and <rtcp-fb-trr-int> elements from a description."""
        xep_0293 = XEP_0293(host)

        desc_element = xml_tools.parse(
            f"""
            <description xmlns="urn:xmpp:jingle:apps:rtp:1" media="audio">
                <rtcp-fb xmlns="{NS_JINGLE_RTP_RTCP_FB}" type="nack" subtype="pli"/>
                <rtcp-fb-trr-int xmlns="{NS_JINGLE_RTP_RTCP_FB}" value="100"/>
            </description>
            """
        )

        media_data = {}
        xep_0293._parse_description_trigger(desc_element, media_data)

        assert media_data[RTCP_FB_KEY][0] == ("nack", "pli", {})
        assert media_data["rtcp_fb_trr_int"][0] == 100

    def test_parse_description_payload_type(self, host):
        """Parsing of <rtcp-fb> and <rtcp-fb-trr-int> elements from a payload type."""
        xep_0293 = XEP_0293(host)

        desc_element = xml_tools.parse(
            f"""
            <description xmlns="urn:xmpp:jingle:apps:rtp:1" media="audio">
                <payload-type id="96">
                    <rtcp-fb xmlns="{NS_JINGLE_RTP_RTCP_FB}" type="nack" subtype="pli"/>
                    <rtcp-fb-trr-int xmlns="{NS_JINGLE_RTP_RTCP_FB}" value="100"/>
                </payload-type>
            </description>
            """
        )

        media_data = {}
        payload_type_elt = desc_element.firstChildElement()
        payload_type_data = {}
        xep_0293._parse_description_payload_type_trigger(
            desc_element, media_data, payload_type_elt, payload_type_data
        )

        assert payload_type_data[RTCP_FB_KEY][0] == ("nack", "pli", {})
        assert payload_type_data["rtcp_fb_trr_int"][0] == 100

    def test_build_rtcp_fb_elements(self, host):
        """Building the <rtcp-fb> and <rtcp-fb-trr-int> elements."""
        xep_0293 = XEP_0293(host)
        data = {RTCP_FB_KEY: [("nack", "pli", {})], "rtcp-fb-trr-int": 100}

        # Test _build_description_trigger
        desc_elt = domish.Element((NS_JINGLE_RTP, "description"))
        xep_0293._build_description_trigger(desc_elt, data, {})

        rtcp_fb_elts = list(desc_elt.elements(NS_JINGLE_RTP_RTCP_FB, "rtcp-fb"))
        assert len(rtcp_fb_elts) == 1
        rtcp_fb_elt = rtcp_fb_elts[0]
        assert rtcp_fb_elt["type"] == "nack"
        assert rtcp_fb_elt["subtype"] == "pli"

        rtcp_fb_trr_int_elts = list(
            desc_elt.elements(NS_JINGLE_RTP_RTCP_FB, "rtcp-fb-trr-int")
        )
        assert len(rtcp_fb_trr_int_elts) == 1
        rtcp_fb_trr_int_elt = rtcp_fb_trr_int_elts[0]
        assert int(rtcp_fb_trr_int_elt["value"]) == 100

        # Test _build_description_payload_type_trigger
        desc_elt = domish.Element((NS_JINGLE_RTP, "description"))
        payload_type_elt = desc_elt.addElement((NS_JINGLE_RTP, "payload-type"))
        xep_0293._build_description_payload_type_trigger(
            desc_elt, {}, data, payload_type_elt
        )

        rtcp_fb_elts = list(payload_type_elt.elements(NS_JINGLE_RTP_RTCP_FB, "rtcp-fb"))
        assert len(rtcp_fb_elts) == 1
        rtcp_fb_elt = rtcp_fb_elts[0]
        assert rtcp_fb_elt["type"] == "nack"
        assert rtcp_fb_elt["subtype"] == "pli"

        rtcp_fb_trr_int_elts = list(
            payload_type_elt.elements(NS_JINGLE_RTP_RTCP_FB, "rtcp-fb-trr-int")
        )
        assert len(rtcp_fb_trr_int_elts) == 1
        rtcp_fb_trr_int_elt = rtcp_fb_trr_int_elts[0]
        assert int(rtcp_fb_trr_int_elt["value"]) == 100