# Common functions shared by LTSP init scripts

# ltsp_config sources ltsp-client-functions
. /usr/share/ltsp/ltsp_config

warn() {
    msg="$1"
    logger -p user.warning -t ltsp-client  "warning: $msg"
}

start_sound() {
    if boolean_is_true "$SOUND" ; then
        case "$SOUND_DAEMON" in
            pulse|'') # The default when no value is set
                # Explicitly allow pulse user access to sound devices, ignore errors
                if [ -x /usr/bin/setfacl ]; then
                    /usr/bin/setfacl -m u:pulse:rw /dev/snd/* > /dev/null 2>&1
                fi

                # Detect method, 0.9.16+ uses module-udev-detect instead of
                # module-detect and module-stream-restore instead of
                # module-volume-restore
                unset PULSE_DETECT
                unset PULSE_VOLUME_RESTORE
                # Replace "awk" with shell built-in "while read"
                case $(pulseaudio --version |while read a b; do echo $b; done) in
                    0.9.1[6-9]*|0.9.[2-9][0-9]*) 
                        PULSE_DETECT=module-udev-detect 
                        PULSE_VOLUME_RESTORE=module-stream-restore 
                        ;;
                    0.[0-9].*) 
                        PULSE_DETECT=module-detect
                        PULSE_VOLUME_RESTORE=module-volume-restore
                        ;;
                    *) 
                        PULSE_DETECT=module-udev-detect 
                        PULSE_VOLUME_RESTORE=module-stream-restore 
                        ;;
                esac
                /usr/bin/pulseaudio --system \
                --exit-idle-time=-1 \
                --disable-shm \
                --no-cpu-limit \
                --resample-method=trivial \
                --high-priority \
                --log-target=syslog \
                -L $PULSE_DETECT \
                -L "module-esound-protocol-tcp auth-anonymous=1" \
                -L "module-native-protocol-tcp auth-anonymous=1" \
                -L $PULSE_VOLUME_RESTORE \
                -L module-rescue-streams \
                -L "module-native-protocol-unix auth-anonymous=1" \
                -n &
                ;;
            esd) 
                /usr/bin/esd -nobeeps -public -tcp &
                ;;
            nasd)
                /usr/bin/nasd -aa &
                # Line copied from old LTSP:  Should we use it? [pere 2006-03-03]
                #aumix-minimal -v100 -w100 -c90 -m10
                ;;
            [Ff][Aa][Ll][Ss][Ee]|[Nn]|[Nn][Oo])
                # Do not do anything if SOUND_DAEMON is False, N, or No
                true
                ;;
            *)
                warn "Unable to start unsupported sound daemon: '$SOUND_DAEMON'"
                ;;
        esac
    fi
}

configure_sound_volume() {
    if boolean_is_true "${SOUND:-True}" ; then
        CARD_NUM=${1:-0}
        # Set up sound volume
        ## Set higher volume than default if not specified by lts.conf
    
        [ -z "$VOLUME" ]           && VOLUME=90
        [ -z "$PCM_VOLUME" ]       && PCM_VOLUME=90
        
        LANG=C amixer -c${CARD_NUM} scontents | while read line; do
            if [ -n "$(echo $line|grep 'Simple mixer control')" ]; then
                channel=$(echo $line|sed -e 's/^Simple mixer control //')
            else
                if [ -n "$channel" ]; then
                    # Translate the channel name into an environmentally
                    # friendly variable.  In other words, a variable
                    # in all caps, where forward slashes, hyphens, and 
                    # spaces are replaced by underscores, and anything
                    # in parentheses is dropped completely
                    # eg. if the channel is named 'Mic Boost (+20dB)'
                    #     then the variable is simply MIC_BOOST_SWITCH
                    #
                    # Oh, and SWITCH is used for on/off switches - value
                    # should be on or off, and VOLUME is used for volumes
                    # where the value should be a number representing a 
                    # percentage
                    channel_name=$(echo ${channel}|sed -e s/^\'// -e s/\'.*$// -e 's/ -//g' -e 's/ [(].*[)]//' -e 's/\//_/g' -e 's/ /_/g' -e 's/-/_/g' |tr [a-z] [A-Z])
                    if [ -n "$(echo $line|grep volume)" ]; then
                        eval channel_vol="\$${channel_name}_VOLUME"
                        if [ "${channel_name}" = "MIC" ]; then 
                            cap="cap"
                        else
                            unset cap
                        fi
                        if boolean_is_true "${VOLUME_MANUAL}"; then
                            [ -n "${channel_vol}" ] && echo sset "${channel}" ${channel_vol}% unmute $cap 
                        else
                            # Set default MIC volumes to 40 if unspecified
                            # This should resolve feedback issues
                            case "${channel_name}" in
                                *MIC*) [ -z "${channel_vol}" ] && channel_vol=40 ;;
                            esac
                            echo sset "${channel}" ${channel_vol:-$VOLUME}% unmute $cap 
                        fi
                    fi
                    if [ -n "$(echo $line|grep switch)" ]; then
                        eval channel_switch="\$${channel_name}_SWITCH"
                        [ -n "${channel_switch}" ] && echo sset "${channel}" ${channel_switch} 
                    fi
                fi
                unset channel
            fi
        done | amixer -c${CARD_NUM} --stdin >/dev/null 2>&1
    fi
}

start_screen_sessions() {
    # If no default was found, there's no SCREEN_xx to be started, so exit
    test -n "$SCREEN_DEFAULT" || return

    # Start the default screen and make it the active tty
    openvt -f -c "${SCREEN_DEFAULT#0}" -s -- /usr/share/ltsp/screen_session "$SCREEN_DEFAULT"

    # Give the default screen a head start
    sleep 1

    # Launch the other screens without switching to them
    for i in 01 02 03 04 05 06 07 08 09 10 11 12; do
        test "$i" -eq "$SCREEN_DEFAULT" && continue
        eval "screen=\$SCREEN_$i"
        if [ -n "$screen" ]; then
            openvt -f -c "${i#0}" -- /usr/share/ltsp/screen_session "$i"
        fi
    done
}