module:log('info', 'Starting visitors_component at %s', module.host);

local array = require "util.array";
local http = require 'net.http';
local jid = require 'util.jid';
local st = require 'util.stanza';
local util = module:require 'util';
local is_admin = util.is_admin;
local is_healthcheck_room = util.is_healthcheck_room;
local is_sip_jigasi = util.is_sip_jigasi;
local room_jid_match_rewrite = util.room_jid_match_rewrite;
local get_room_from_jid = util.get_room_from_jid;
local get_focus_occupant = util.get_focus_occupant;
local get_room_by_name_and_subdomain = util.get_room_by_name_and_subdomain;
local internal_room_jid_match_rewrite = util.internal_room_jid_match_rewrite;
local table_find = util.table_find;
local is_vpaas = util.is_vpaas;
local is_sip_jibri_join = util.is_sip_jibri_join;
local process_host_module = util.process_host_module;
local respond_iq_result = util.respond_iq_result;
local split_string = util.split_string;
local new_id = require 'util.id'.medium;
local json = require 'cjson.safe';
local inspect = require 'inspect';

-- Debug flag
local DEBUG = false;

-- will be initialized once the main virtual host module is initialized
local token_util;

local MUC_NS = 'http://jabber.org/protocol/muc';

local muc_domain_prefix = module:get_option_string('muc_mapper_domain_prefix', 'conference');
local muc_domain_base = module:get_option_string('muc_mapper_domain_base');
if not muc_domain_base then
    module:log('warn', 'No muc_domain_base option set.');
    return;
end

-- A list of domains which to be ignored for visitors. The config is set under the main virtual host
local ignore_list = module:context(muc_domain_base):get_option_set('visitors_ignore_list', {});

local auto_allow_promotion = module:get_option_boolean('auto_allow_visitor_promotion', false);

-- whether to always advertise that visitors feature is enabled for rooms
-- can be set to off and being controlled by another module, turning it on and off for rooms
local always_visitors_enabled = module:get_option_boolean('always_visitors_enabled', true);

local visitors_queue_service = module:get_option_string('visitors_queue_service');
local http_headers = {
    ["User-Agent"] = "Prosody (" .. prosody.version .. "; " .. prosody.platform .. ")",
    ["Content-Type"] = "application/json",
    ["Accept"] = "application/json"
};

-- This is a map to keep data for room and the jids that were allowed to join after visitor mode is enabled
-- automatically allowed or allowed by a moderator
local visitors_promotion_map = {};

-- A map with key room jid. The content is a map with key jid from which the request is received
-- and the value is a table that has the json message that needs to be sent to any future moderator that joins
-- and the vnode from which the request is received and where the response will be sent
local visitors_promotion_requests = {};

local cache = require 'util.cache';
local sent_iq_cache = cache.new(200);

-- Function to get visitors room metadata
local function get_visitors_room_metadata(room)
    if not room.jitsiMetadata then
        room.jitsiMetadata = {};
    end
    if not room.jitsiMetadata.visitors then
        room.jitsiMetadata.visitors = {};
    end
    return room.jitsiMetadata.visitors;
end

-- Sends a json-message to the destination jid
-- @param to_jid the destination jid
-- @param json_message the message content to send
function send_json_message(to_jid, json_message)
    local stanza = st.message({ from = module.host; to = to_jid; })
         :tag('json-message', { xmlns = 'http://jitsi.org/jitmeet' }):text(json_message):up();
    module:send(stanza);
end

local function request_promotion_received(room, from_jid, from_vnode, nick, time, user_id, group_id, force_promote_requested)
    if DEBUG then
         module:log('debug', 'Received promotion request from %s for room %s, nick: %s, time: %s, user_id: %s, group_id: %s, force_promote_requested: %s',
        from_jid, room.jid, nick, time, user_id, group_id, force_promote_requested);
    end

    -- if visitors is enabled for the room
    if visitors_promotion_map[room.jid] then
        local force_promote = auto_allow_promotion or get_visitors_room_metadata(room).autoPromote;
        if not force_promote and force_promote_requested == 'true' then
            -- Let's do the force_promote checks if requested
            -- if it is vpaas meeting we trust the moderator computation from visitor node (value of force_promote_requested)
            -- if it is not vpaas we need to check further settings only if they exist
            if is_vpaas(room) or (not room._data.moderator_id and not room._data.moderators)
                -- _data.moderator_id can be used from external modules to set single moderator for a meeting
                -- or a whole group of moderators
                or (room._data.moderator_id
                    and room._data.moderator_id == user_id or room._data.moderator_id == group_id)

                -- all moderators are allowed to auto promote, the fact that user_id and force_promote_requested are set
                -- means that the user has token and is moderator on visitor node side
                or room._data.allModerators

                -- can be used by external modules to set multiple moderator ids (table of values)
                or table_find(room._data.moderators, user_id)
            then
                force_promote = true;
            end
        end

        -- only for raise hand, ignore lowering the hand
        if time and time > 0 and force_promote then
            --  we are in auto-allow mode, let's reply with accept
            -- we store where the request is coming from so we can send back the response
            local username = new_id():lower();
            visitors_promotion_map[room.jid][username] = {
                from = from_vnode;
                jid = from_jid;
            };

            local req_from = visitors_promotion_map[room.jid][username].from;
            local req_jid = visitors_promotion_map[room.jid][username].jid;
            local focus_occupant = get_focus_occupant(room);
            local focus_jid = focus_occupant and focus_occupant.bare_jid or nil;

            local iq_id = new_id();
            sent_iq_cache:set(iq_id, socket.gettime());

            local node = jid.node(room.jid);

            module:send(st.iq({
                    type='set', to = req_from, from = module.host, id = iq_id })
                :tag('visitors', {
                    xmlns='jitsi:visitors',
                    room = jid.join(node, muc_domain_prefix..'.'..req_from),
                    focusjid = focus_jid })
                 :tag('promotion-response', {
                    xmlns='jitsi:visitors',
                    jid = req_jid,
                    username = username ,
                    allow = 'true' }):up());
            return true;
        else
            -- send promotion request to all moderators
            local body_json = {};
            body_json.type = 'visitors';
            body_json.room = internal_room_jid_match_rewrite(room.jid);
            body_json.action = 'promotion-request';
            body_json.nick = nick;
            body_json.from = from_jid;

            if time and time > 0 then
                -- raise hand
                body_json.on = true;
            else
                -- lower hand, we want to inform interested parties that
                -- the visitor is no longer interested in joining the main call
                body_json.on = false;
            end

            local msg_to_send, error = json.encode(body_json);

            if not msg_to_send then
                module:log('error', 'Error encoding msg room:%s error:%s', room.jid, error)
                return true;
            end

            if visitors_promotion_requests[room.jid] then
                visitors_promotion_requests[room.jid][from_jid] = {
                    msg = msg_to_send;
                    from = from_vnode;
                };
            else
                module:log('warn', 'Received promotion request for room %s with visitors not enabled. %s',
                    room.jid, msg_to_send);
            end

            -- let's send a notification to every moderator
            for _, occupant in room:each_occupant() do
                if occupant.role == 'moderator' and not is_admin(occupant.bare_jid) then
                    send_json_message(occupant.jid, msg_to_send);
                end
            end

            return true;
        end
    end

    module:log('warn', 'Received promotion request from %s for room %s without active visitors', from, room.jid);
end

local function connect_vnode_received(room, vnode)
    module:context(muc_domain_base):fire_event('jitsi-connect-vnode', { room = room; vnode = vnode; });

    if not visitors_promotion_map[room.jid] then
        -- visitors is enabled
        visitors_promotion_map[room.jid] = {};
        visitors_promotion_requests[room.jid] = {};
        room._connected_vnodes = cache.new(16); -- we up to 16 vnodes for this prosody
    end

    room._connected_vnodes:set(vnode..'.meet.jitsi', {});
end

local function disconnect_vnode_received(room, vnode)
    module:context(muc_domain_base):fire_event('jitsi-disconnect-vnode', { room = room; vnode = vnode; });

    room._connected_vnodes:set(vnode..'.meet.jitsi', nil);

    if room._connected_vnodes:count() == 0 then
        visitors_promotion_map[room.jid] = nil;
        visitors_promotion_requests[room.jid] = nil;
        room._connected_vnodes = nil;
    end
end

-- returns the accumulated data for visitors nodes, count all visitors requesting transcriptions
-- and accumulated languages requested
-- @returns count, languages
function get_visitors_languages(room)
    if not room._connected_vnodes then
        return;
    end

    local count = 0;
    local languages = array();

    -- iterate over visitor nodes we are connected to and accumulate data if we have it
    for k, v in room._connected_vnodes:items() do
        if v.count then
            count = count + v.count;
        end
        if v.langs then
            for k in pairs(v.langs) do
                local val = v.langs[k]
                if not languages[val] then
                    languages:push(val);
                end
            end
        end
    end
    return count, languages:sort():concat(',');
end

-- listens for iq request for promotion and forward it to moderators in the meeting for approval
-- or auto-allow it if such the config is set enabling it
local function stanza_handler(event)
    local origin, stanza = event.origin, event.stanza;

    if stanza.name ~= 'iq' then
        return;
    end

    if DEBUG then
        module:log('debug', 'Received stanza %s from %s', stanza, origin.full_jid);
    end

    if stanza.attr.type == 'result' and sent_iq_cache:get(stanza.attr.id) then
        sent_iq_cache:set(stanza.attr.id, nil);
        return true;
    end

    if stanza.attr.type ~= 'set' and stanza.attr.type ~= 'get' then
        return; -- We do not want to reply to these, so leave.
    end

    local visitors_iq = event.stanza:get_child('visitors', 'jitsi:visitors');
    if not visitors_iq then
        return;
    end

    -- set stanzas are coming from s2s connection
    if stanza.attr.type == 'set' and origin.type ~= 's2sin' then
        module:log('warn', 'not from s2s session, ignore! %s', stanza);
        return true;
    end

    local room_jid = visitors_iq.attr.room;
    local room = get_room_from_jid(room_jid_match_rewrite(room_jid));

    if not room then
        -- this maybe as we receive the iq from jicofo after the room is already destroyed
        module:log('debug', 'No room found %s', room_jid);
        return true;
    end

    local from_vnode;
    if room._connected_vnodes then
        from_vnode = room._connected_vnodes:get(stanza.attr.from);
    end

    local processed;
    -- promotion request is coming from visitors and is a set and is over the s2s connection
    local request_promotion = visitors_iq:get_child('promotion-request');
    if request_promotion then
        if not from_vnode then
            module:log('warn', 'Received forged request_promotion message: %s %s',stanza, inspect(room._connected_vnodes));
            return true; -- stop processing
        end

        local display_name = visitors_iq:get_child_text('nick', 'http://jabber.org/protocol/nick');
        processed = request_promotion_received(
            room,
            request_promotion.attr.jid,
            stanza.attr.from,
            display_name,
            tonumber(request_promotion.attr.time),
            request_promotion.attr.userId,
            request_promotion.attr.groupId,
            request_promotion.attr.forcePromote
        );
    end

    -- connect and disconnect are only received from jicofo
    if is_admin(jid.bare(stanza.attr.from)) then
        for item in visitors_iq:childtags('connect-vnode') do
            connect_vnode_received(room, item.attr.vnode);
            processed = true;
        end

        for item in visitors_iq:childtags('disconnect-vnode') do
            disconnect_vnode_received(room, item.attr.vnode);
            processed = true;
        end
    end

    -- request to update metadata service for jigasi languages
    local transcription_languages = visitors_iq:get_child('transcription-languages');

    if transcription_languages
        and (transcription_languages.attr.langs or transcription_languages.attr.count) then
        if not from_vnode then
            module:log('warn', 'Received forged transcription_languages message: %s %s',stanza, inspect(room._connected_vnodes));
            return true; -- stop processing
        end

        local metadata = get_visitors_room_metadata(room);

        -- we keep the split by languages array to optimize accumulating languages
        from_vnode.langs = split_string(transcription_languages.attr.langs, ',');
        from_vnode.count = transcription_languages.attr.count;

        local count, languages = get_visitors_languages(room);

        if metadata.transcribingLanguages ~= languages then
            metadata.transcribingLanguages = languages;
            processed = true;
        end

        if metadata.transcribingCount ~= count then
            metadata.transcribingCount = count;
            processed = true;
        end

        if processed then
            module:context(muc_domain_prefix..'.'..muc_domain_base)
                :fire_event('room-metadata-changed', { room = room; });
        end
    end

    if not processed then
        module:log('warn', 'Unknown iq received for %s: %s', module.host, stanza);
    end

    respond_iq_result(origin, stanza);
    return processed;
end

local function process_promotion_response(room, id, approved)
    if not approved then
        module:log('debug', 'promotion not approved %s, %s', room.jid, id);
        return;
    end

    if DEBUG then
        module:log('debug', 'Processing promotion response for room %s, id %s, approved %s',
            room.jid, id, approved);
    end

    -- lets reply to participant that requested promotion
    local username = new_id():lower();
    visitors_promotion_map[room.jid][username] = {
        from = visitors_promotion_requests[room.jid][id].from;
        jid = id;
    };

    local req_from = visitors_promotion_map[room.jid][username].from;
    local req_jid = visitors_promotion_map[room.jid][username].jid;
    local focus_occupant = get_focus_occupant(room);
    local focus_jid = focus_occupant and focus_occupant.bare_jid or nil;

    local iq_id = new_id();
    sent_iq_cache:set(iq_id, socket.gettime());

    local node = jid.node(room.jid);

    module:send(st.iq({
            type='set', to = req_from, from = module.host, id = iq_id })
        :tag('visitors', {
            xmlns='jitsi:visitors',
            room = jid.join(node, muc_domain_prefix..'.'..req_from),
            focusjid = focus_jid })
         :tag('promotion-response', {
            xmlns='jitsi:visitors',
            jid = req_jid,
            username = username,
            allow = approved }):up());
end

-- if room metadata does not have visitors.live set to `true` and there are no occupants in the meeting
-- it will skip calling goLive endpoint
local function go_live(room)

    if DEBUG then
        module:log('debug', 'Checking if room %s is live', room.jid);
    end

    if room._jitsi_go_live_sent then
        if DEBUG then
            module:log('debug', 'Room %s already sent go live request, skipping', room.jid);
        end
        return;
    end

    -- if missing we assume room is live, only skip if it is marked explicitly as false
    if room.jitsiMetadata and room.jitsiMetadata.visitors
            and room.jitsiMetadata.visitors.live ~= nil and room.jitsiMetadata.visitors.live == false then
        if DEBUG then
            module:log('debug', 'Room %s is not live, skipping go live request', room.jid);
        end
        return;
    end

    local has_occupant = false;
    for _, occupant in room:each_occupant() do
        if not is_admin(occupant.bare_jid) then
            has_occupant = true;
            break;
        end
    end

    -- when there is an occupant then go live
    if not has_occupant then
        if DEBUG then
            module:log('debug', 'Room %s has no occupants, skipping go live request', room.jid);
        end
        return;
    end

    -- let's inform the queue service
    local function cb(content_, code_, response_, request_)
        local room = room;
        if code_ ~= 200 then
            module:log('warn', 'External call to visitors_queue_service/golive failed. Code %s, Content %s',
                code_, content_)
        end
    end

    local headers = http_headers or {};
    headers['Authorization'] = token_util:generateAsapToken();

    local ev = {
        conference = internal_room_jid_match_rewrite(room.jid)
    };

    room._jitsi_go_live_sent = true;

    http.request(visitors_queue_service..'/golive', {
        headers = headers,
        method = 'POST',
        body = json.encode(ev);
    }, cb);
end

module:hook('iq/host', stanza_handler, 10);

process_host_module(muc_domain_base, function(host_module, host)
    token_util = module:require "token/util".new(host_module);
end);

process_host_module(muc_domain_prefix..'.'..muc_domain_base, function(host_module, host)
    -- if visitor mode is started, then you are not allowed to join without request/response exchange of iqs -> deny access
    -- check list of allowed jids for the room
    host_module:hook('muc-occupant-pre-join', function (event)
        local room, stanza, occupant, session = event.room, event.stanza, event.occupant, event.origin;

        if is_healthcheck_room(room.jid) or is_admin(occupant.bare_jid) then
            if DEBUG then
                module:log('debug', 'Skipping visitor checks for healthcheck room %s or admin %s',
                    room.jid, occupant.bare_jid);
            end
            return;
        end

        -- visitors were already in the room one way or another they have access
        -- skip password challenge
        local join = stanza:get_child('x', MUC_NS);
        if join and room:get_password() and
            visitors_promotion_map[room.jid] and visitors_promotion_map[room.jid][jid.node(stanza.attr.from)] then
            join:tag('password', { xmlns = MUC_NS }):text(room:get_password());
        end

        local is_live = get_visitors_room_metadata(room).live;

        -- we skip any checks when auto-allow is enabled and room is live
        if (auto_allow_promotion or get_visitors_room_metadata(room).autoPromote and (is_live or is_live == nil))
            or ignore_list:contains(jid.host(stanza.attr.from)) -- jibri or other domains to ignore
            or is_sip_jigasi(stanza)
            or is_sip_jibri_join(stanza)
            or table_find(room._data.moderators, session.jitsi_meet_context_user and session.jitsi_meet_context_user.id)
            or (room._data.moderator_id and room._data.moderator_id == (session.jitsi_meet_context_user and session.jitsi_meet_context_user.id))
            or table_find(room._data.participants, session.jitsi_meet_context_user and session.jitsi_meet_context_user.id) then
            if DEBUG then
                module:log('debug', 'Auto-allowing visitor %s in room %s', stanza.attr.from, room.jid);
            end
                return;
        end

        if visitors_promotion_map[room.jid] then
            local in_ignore_list = ignore_list:contains(jid.host(stanza.attr.from));

            -- now let's check for jid
            if visitors_promotion_map[room.jid][jid.node(stanza.attr.from)] -- promotion was approved
                or in_ignore_list then -- jibri or other domains to ignore
                -- allow join
                if not in_ignore_list then
                    -- let's update metadata
                    local metadata = get_visitors_room_metadata(room);
                    if not metadata.promoted then
                        metadata.promoted = {};
                    end
                    metadata.promoted[jid.resource(occupant.nick)] = true;
                    module:context(muc_domain_prefix..'.'..muc_domain_base)
                        :fire_event('room-metadata-changed', { room = room; });
                end

                return;
            end
            module:log('error', 'Visitor needs to be allowed by a moderator %s', stanza.attr.from);
            session.send(st.error_reply(stanza, 'cancel', 'not-allowed', 'Visitor needs to be allowed by a moderator')
                :tag('promotion-not-allowed', { xmlns = 'jitsi:visitors' }));
            return true;
        elseif is_vpaas(room) then
            -- special case for vpaas where if someone with a visitor token tries to join a room, where
            -- there are no visitors yet, we deny access
            if session.jitsi_meet_context_user and session.jitsi_meet_context_user.role == 'visitor' then
                session.log('warn', 'Deny user join as visitor in the main meeting, not approved');
                session.send(st.error_reply(
                    stanza, 'cancel', 'not-allowed', 'Visitor tried to join the main room without approval')
                        :tag('no-main-participants', { xmlns = 'jitsi:visitors' }));
                return true;
            end
        elseif room._data.participants then
                -- This is non jaas room which has a list of participants allowed to participate in the main room
                -- but this occupant is not one of them and the room is either not live or has no participants joined
                session.log('warn',
                    'Deny user join in the main not live meeting, not in the list of main participants');
                session.send(st.error_reply(
                    stanza, 'cancel', 'not-allowed',
                    'Tried to join the main (not live or without main participants) room')
                        :tag('not-live-room', { xmlns = 'jitsi:visitors' }));
                return true;
        end

    end, 7); -- after muc_meeting_id, the logic for not joining before jicofo
    host_module:hook('muc-room-destroyed', function (event)
        visitors_promotion_map[event.room.jid] = nil;
        visitors_promotion_requests[event.room.jid] = nil;
    end);

    host_module:hook('muc-occupant-joined', function (event)
        local room, occupant = event.room, event.occupant;

        if DEBUG then
            module:log('debug', 'Occupant %s joined room %s', occupant.jid, room.jid);
        end

        if is_healthcheck_room(room.jid) or is_admin(occupant.bare_jid) or occupant.role ~= 'moderator' -- luacheck: ignore
            or not visitors_promotion_requests[event.room.jid] then
                if DEBUG then
                    module:log('debug', 'Skipping visitor checks for healthcheck room %s or admin %s or not moderator %s',
                        room.jid, occupant.bare_jid, occupant.role);
                end
            return;
        end

        for _,value in pairs(visitors_promotion_requests[event.room.jid]) do
            send_json_message(occupant.jid, value.msg);
        end
    end);
    host_module:hook('muc-set-affiliation', function (event)
        -- the actor can be nil if is coming from allowners or similar module we want to skip it here
        -- as we will handle it in occupant_joined
        local actor, affiliation, jid, room = event.actor, event.affiliation, event.jid, event.room;

        if is_admin(jid) or is_healthcheck_room(room.jid) or not actor or not affiliation == 'owner' -- luacheck: ignore
            or not visitors_promotion_requests[event.room.jid] then
            return;
        end

        -- event.jid is the bare jid of participant
        for _, occupant in room:each_occupant() do
            if occupant.bare_jid == event.jid then
                for _,value in pairs(visitors_promotion_requests[event.room.jid]) do
                    send_json_message(occupant.jid, value.msg);
                end
            end
        end
    end);

    host_module:hook('jitsi-endpoint-message-received', function(event)
        local data, error, occupant, room, stanza
            = event.message, event.error, event.occupant, event.room, event.stanza;

        if not data or data.type ~= 'visitors'
            or (data.action ~= "promotion-response" and data.action ~= "demote-request") then
            if error then
                module:log('error', 'Error decoding error:%s', error);
            end
            return;
        end

        if occupant.role ~= 'moderator' then
            module:log('error', 'Occupant %s sending response message but not moderator in room %s',
                occupant.jid, room.jid);
            return false;
        end

        if data.action == "demote-request" then
            if occupant.nick ~= room.jid..'/'..data.actor then
                module:log('error', 'Bad actor in demote request %s', stanza);
                event.origin.send(st.error_reply(stanza, "cancel", "bad-request"));
                return true;
            end

            -- when demoting we want to send message to the demoted participant and to moderators
            local target_jid = room.jid..'/'..data.id;
            stanza.attr.type = 'chat'; -- it is safe as we are not using this stanza instance anymore
            stanza.attr.from = module.host;

            for _, room_occupant in room:each_occupant() do
                -- do not send it to jicofo or back to the sender
                if room_occupant.jid ~= occupant.jid and not is_admin(room_occupant.bare_jid) then
                    if room_occupant.role == 'moderator'
                        or room_occupant.nick == target_jid then
                        stanza.attr.to = room_occupant.jid;
                        room:route_stanza(stanza);
                    end
                end
            end
        else
            if data.id then
                process_promotion_response(room, data.id, data.approved and 'true' or 'false');
            else
                -- we are in the case with admit all, we need to read data.ids
                for _,value in pairs(data.ids) do
                    process_promotion_response(room, value, data.approved and 'true' or 'false');
                end
            end
        end

        return true; -- halt processing, but return true that we handled it
    end);

    if visitors_queue_service then
        host_module:hook('muc-room-created', function (event)
            local room = event.room;

            if is_healthcheck_room(room.jid) then
                return;
            end

            go_live(room);
        end, -2); -- metadata hook on -1
        host_module:hook('jitsi-metadata-updated', function (event)
            if event.key == 'visitors' then
                go_live(event.room);
            end
        end);
        -- when metadata changed internally from another module
        host_module:hook('room-metadata-changed', function (event)
            go_live(event.room);
        end);
        host_module:hook('muc-occupant-joined', function (event)
            local room = event.room;

            if is_healthcheck_room(room.jid) then
                return;
            end

            go_live(room);
        end);
    end

    if always_visitors_enabled then
        local visitorsEnabledField = {
            name = "muc#roominfo_visitorsEnabled";
            type = "boolean";
            label = "Whether visitors are enabled.";
            value = 1;
        };
        -- Append "visitors enabled" to the MUC config form.
        host_module:context(host):hook("muc-disco#info", function(event)
            table.insert(event.form, visitorsEnabledField);
        end);
        host_module:context(host):hook("muc-config-form", function(event)
            table.insert(event.form, visitorsEnabledField);
        end);
    end
end);

prosody.events.add_handler('pre-jitsi-authentication', function(session)
    if not session.customusername or not session.jitsi_web_query_room then
        return nil;
    end

    local room = get_room_by_name_and_subdomain(session.jitsi_web_query_room, session.jitsi_web_query_prefix);
    if not room then
        return nil;
    end

    if visitors_promotion_map[room.jid] and visitors_promotion_map[room.jid][session.customusername] then
        -- user was previously allowed to join, let him use the requested jid
        return session.customusername;
    end
end);

-- when occupant is leaving breakout to join the main room and visitors are enabled
-- make sure we will allow that participant to join as it is already part of the main room
function handle_occupant_leaving_breakout(event)
    local main_room, occupant, stanza = event.main_room, event.occupant, event.stanza;
    local presence_status = stanza:get_child_text('status');

    if presence_status ~= 'switch_room' or not visitors_promotion_map[main_room.jid] then
        return;
    end

    local node = jid.node(occupant.bare_jid);

    visitors_promotion_map[main_room.jid][node] = {
        from = 'none';
        jid = occupant.bare_jid;
    };
end
module:hook_global('jitsi-breakout-occupant-leaving', handle_occupant_leaving_breakout);