if (isReply) {
    if (inThread) {
        if (hasSameMembers) {
            // register new message in thread
            // possibly convert to room only if parent is channel
        } else {
            // create sub thread
        }
    } else if (inRoom) {
        if (isGroup) {
            if (hasSameMembers) {
                // register new message in group
            } else {
                // create thread
            }
        } else { // reply from channel
            if (messageInRoom == 1) { // was new channel transform to group
                // register new message in group
            } else if (sender == owner) { // correction from the original sender
                // leave in the same channel
            } else { // user response to announcement
                // create new thread
            }
        }
    } else { // transfer
        // todo test if members of transferred message are included
    }
} else {
    if (inRoomByOwner) {
        // register message in room
    } else {
        // create room
    }
}