echo "**** Configure VNC ****"

function get_next_unused_port() {
    local __start_port=${1}
    local __start_port=$((__start_port+1))
    local __netstat_report=$(netstat -atulnp 2> /dev/null)
    for __check_port in $(seq ${__start_port} 65000); do
        [[ -z $(echo "${__netstat_report}" | grep ${__check_port}) ]] && break;
    done
    echo ${__check_port}
}

# Configure random ports for VNC service, pulseaudio socket, noVNC service and audio transport websocket
# Note: Ports 32035-32248 are unallocated port ranges. We should be able to find something in here that we can use
#   REF: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?&page=130
DYNAMIC_PORT_VNC=$(get_next_unused_port 32035)
DYNAMIC_PORT_NOVNC_SERVICE=$(get_next_unused_port ${DYNAMIC_PORT_VNC})
DYNAMIC_PORT_AUDIO_WEBSOCKET=$(get_next_unused_port ${DYNAMIC_PORT_NOVNC_SERVICE})
DYNAMIC_PORT_AUDIO_STREAM=$(get_next_unused_port ${DYNAMIC_PORT_AUDIO_WEBSOCKET})
export PORT_VNC=${PORT_VNC:-$DYNAMIC_PORT_VNC}
echo "Configure VNC service port '${PORT_VNC}'"
export PORT_NOVNC_SERVICE=${PORT_NOVNC_SERVICE:-$DYNAMIC_PORT_NOVNC_SERVICE}
echo "Configure noVNC service port '${PORT_NOVNC_SERVICE}'"
export PORT_AUDIO_WEBSOCKET=${PORT_AUDIO_WEBSOCKET:-$DYNAMIC_PORT_AUDIO_WEBSOCKET}
echo "Configure audio websocket port '${PORT_AUDIO_WEBSOCKET}'"
export PORT_AUDIO_STREAM=${PORT_AUDIO_STREAM:-$DYNAMIC_PORT_AUDIO_STREAM}
echo "Configure pulseaudio encoded stream port '${PORT_AUDIO_STREAM}'"

if ([ "${MODE}" != "s" ] && [ "${MODE}" != "secondary" ]); then

    if [ "${WEB_UI_MODE:-}" = "vnc" ]; then
        echo "Enable VNC server"
        sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/vnc.ini
        
        # Configure Nginx proxy for the websocket and VNC
        cp -f /opt/noVNC/nginx.template.conf /opt/noVNC/nginx.conf
        sed -i "s|<USER>|${USER}|" /opt/noVNC/nginx.conf
        sed -i "s|<PORT_NOVNC_WEB>|${PORT_NOVNC_WEB}|" /opt/noVNC/nginx.conf
        sed -i "s|<PORT_NOVNC_SERVICE>|${PORT_NOVNC_SERVICE}|" /opt/noVNC/nginx.conf
        sed -i "s|<PORT_AUDIO_WEBSOCKET>|${PORT_AUDIO_WEBSOCKET}|" /opt/noVNC/nginx.conf
        mkdir -p /var/log/vncproxy
        chown -R ${USER} /var/log/vncproxy

        if [[ "${ENABLE_VNC_AUDIO}" == "true" ]]; then
            # Credits for this audio patch:
            #   - https://github.com/novnc/noVNC/issues/302
            #   - https://github.com/vexingcodes/dwarf-fortress-docker
            #   - https://github.com/calebj/noVNC
            if [ -f /opt/noVNC/audio.patch ]; then
                echo "Patching noVNC with audio websocket"
                # Update port specification in patch file
                sed -i "s|<PORT_AUDIO_WEBSOCKET>|${PORT_AUDIO_WEBSOCKET}|" /opt/noVNC/audio.patch
                # Apply patch
                pushd /opt/noVNC/ &> /dev/null
                patch -p1 --input=/opt/noVNC/audio.patch --batch --quiet
                popd &> /dev/null
                rm /opt/noVNC/audio.patch
            fi
            # Enable supervisord script
            sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/vnc-audio.ini

            # Remove x11vnc from applications menu
            if !  grep -q 'Hidden=true' /usr/share/applications/x11vnc.desktop; then
                echo 'Hidden=true' >> /usr/share/applications/x11vnc.desktop
            fi
        else
            echo "Disable audio stream"
            echo "Disable audio websock"
            # Disable supervisord script
            sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/vnc-audio.ini
        fi
    else
        echo "Disable VNC server"
        sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/vnc.ini
        sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/vnc-audio.ini
    fi
else
    echo "VNC server not available when container is run in 'secondary' mode"
    sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/vnc.ini
    sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/vnc-audio.ini
fi

echo "DONE"