#!/bin/bash

SERVICE_NAMES=(
'nguri TimeCapsule' # For AFP
'nguri SMB'         # For SMB
'nguri TimeCapsule' # For AFP Icon
'nguri SMB'         # For SMB Icon
'Brother MFC-9120CN'    # Printer
'Brother MFC-9120CN'    # Print spooler
'Brother MFC-9120CN'    # PDL Data stream
)

SERVICE_TYPES=(
_afpovertcp._tcp
_smb._tcp
_device-info._tcp
_device-info._tcp
_ipp._tcp
_printer._tcp
_pdl-datastream._tcp
)

SERVICE_PORTS=(
548
445
1
1
631
515
9100
)

SERVICE_IPS=(
192.168.1.1
192.168.1.1
192.168.1.1
192.168.1.1
192.168.1.2
192.168.1.2
192.168.1.2
)

# FIX: Use one valid string format across all three service text definitions
SERVICE_TEXTS=(
''
''
model=TimeCapsule8,119
model=Xserve
'txtvers=1 qtotal=1 pdl=application//vnd.hp-PCL,application//vnd.brother-hbp rp=duerqxesz5090 ty="Brother MFC-9120CN" product="(Brother MFC-9120CN)" adminurl=http://BRN001BA9243652.local./ priority=50 usb_MFG=Brother usb_MDL=MFC-9120CN Color=T Copies=T Duplex=F PaperCustom=T Binary=T Transparent=T TBCP=F'
'txtvers=1 qtotal=1 pdl=application/vnd.hp-PCL,application/vnd.brother-hbp rp=duerqxesz5090 ty="Brother MFC-9120CN" product="(Brother MFC-9120CN)" adminurl=http://BRN001BA9243652.local./ priority=75 usb_MFG=Brother usb_MDL=MFC-9120CN Color=T Copies=T Duplex=F PaperCustom=T Binary=T Transparent=T TBCP=F'
'txtvers=1 qtotal=1 pdl=application/vnd.hp-PCL,application/vnd.brother-hbp ty="Brother MFC-9120CN" product="(Brother MFC-9120CN)" adminurl=http://BRN001BA9243652.local./ priority=25 usb_MFG=Brother usb_MDL=MFC-9120CN Color=T Copies=T Duplex=F PaperCustom=T Binary=T Transparent=F TBCP=T'
)

declare -a PIDS
SLEEP_INTERVAL=10

while [ true ]; do
    ifconfig ppp0 &>/dev/null
    if [ "$?" -eq "0" ]; then
        # We are connected to ppp0
        for ((n=0; n < ${#SERVICE_NAMES[@]}; n++)); do
            # Is dns-sd already running for a particular service?
            kill -0 "${PIDS[$n]}" &>/dev/null
            DNSSD_RUNNING=$?

            # Start if not running...
            if [ "$DNSSD_RUNNING" -ne "0" ]; then
                echo "Starting DNS SD Proxy for service ${SERVICE_TYPES[$n]} on server ${SERVICE_NAMES[$n]}"

                #FIX: by using a temporar variable we can debug the exact command that will be used including all quotes
                CMD="dns-sd -P \"${SERVICE_NAMES[$n]}\" ${SERVICE_TYPES[$n]} local ${SERVICE_PORTS[$n]} \"${SERVICE_NAMES[$n]}.local\" \"${SERVICE_IPS[$n]}\" ${SERVICE_TEXTS[$n]} &>/dev/null &"
                echo "DEBUG: $CMD"
                # use exactly this command
                eval $CMD
                PIDS[$n]=$!;

            # Don't do anything if already running...
            else
                echo "DNS SD Proxy for service ${SERVICE_TYPES[$n]} on server ${SERVICE_NAMES[$n]} is already running"
            fi
        done

    else  # We're not connected to ppp0
        echo "ppp0 is not connected"

        for ((n=0; n < ${#SERVICE_NAMES[@]}; n++)); do
            # If we have running dns-sd instances, stop them
            if [ ! "${PIDS[$n]}" = "" ]; then
                echo "Stopping DNS SD Proxy for service ${SERVICE_TYPES[$n]} on server ${SERVICE_NAMES[$n]}"
                kill "${PIDS[$n]}" &>/dev/null
                PIDS[$n]="";
            else
                echo "DNS SD Proxy for service ${SERVICE_TYPES[$n]} on server ${SERVICE_NAMES[$n]} is not running"
            fi
        done
    fi

    # Wait a while...
    sleep $SLEEP_INTERVAL
done