#!/bin/bash
# 
# EDM update script: Downloads only the changed files from the server
# I'm not a Bash expert, but it should work... If it doesn't, 
# send bug reports to: j-kroll at gmx dot de
#

log () {
	echo "$1" "$2" | tee -a log/updates
}

findterm () {
	if [ `which xfce4-terminal` ]; then	TERMINAL="`which xfce4-terminal` -e"; return;
	elif [ `which gnome-terminal` ]; then	TERMINAL="`which gnome-terminal` -e"; return;
	elif [ `which xterm` ]; then		TERMINAL="`which xterm` -e"; return;
	elif [ `which konsole` ]; then		TERMINAL="`which konsole` -e"; return;
	else	TERMINAL=""; return;	# No terminal found, just get the update w/o interaction
	fi
}

allocterminal () {
	tty -s; if [ $? -eq 0 ]; then return; fi
	
	findterm; $TERMINAL "/bin/bash -c 'TERMWAIT=1 $0'"; exit 0
}

endterm () {
	if [ "$TERMWAIT" ]; then echo -n "Hit Return to Exit. "; read junk; fi
}

extract_timestamp () {
	local RAWSTAMP=`strings bin_unix/edm_server_32 | grep 200..`;
	local TSTAMP=$(date +%s -d "`echo $RAWSTAMP | awk 'BEGIN { FIELDWIDTHS="4 2 2 2 2 2" } { print $1"/"$2"/"$3, $4":"$5 }'`")
	# subtract 30 days
	if [ "x$TSTAMP" != "x" ]; then echo $[ $TSTAMP - 2592000 ]; fi
}


get_timestamp () {
	TIMESTAMP=$[ `stat -c %Y data/.update-timestamp 2>/dev/null` ];
	
	if [ $TIMESTAMP -eq 0 ]; then
		log 
		log "Warning: You have no timestamp file!"
		
		TIMESTAMP=`extract_timestamp 2>/dev/null`;
		if [ "x$TIMESTAMP" != "x" ]; then
			log "Timestamp extracted from Binary ($TIMESTAMP)".
		else
			log "Couldn't extract timestamp from binary either."
			log "Setting timestamp to something near the Epoch."
			log "No Worries Mate."
			TIMESTAMP=1;
		fi
	fi;
}



#
# Mainline Code Starts Here
#

if [ ! -d data ]; then
	echo
	echo "EDM Data directory not found."
	echo "Get the full download from http://edm-fps.net/"
	echo
	exit 1;
fi

mkdir log 2>/dev/null;
touch log/updates;

allocterminal;

echo "Running Update at `LC_ALL=C date`" >> log/updates
echo "-----------------------------------------------" >> log/updates

get_timestamp;

log
log -n " * Checking Server for Updates... "
CHECK=$(wget http://edm-fps.net/edm/download/update.php\?timestamp=$TIMESTAMP -t 10 --spider 2>&1 | tail -n 2 | head -n 1)
if [ "`echo $CHECK | grep 500`" ]; then
	log "$CHECK"
	log
	endterm
	exit 1
elif [ "`echo $CHECK | grep 406`" ]; then
	log "Your binaries are up-to-date."
	log
	endterm
	exit 0
fi

log "$CHECK"
log " * Downloading Update..."
log

ARCH=$(tempfile -s .tar.gz 2>/dev/null)
if [ x$ARCH = x ]; then ARCH=/tmp/edm-update.tar.gz; fi

wget -O $ARCH http://edm-fps.net/edm/download/update.php\?timestamp=$TIMESTAMP\&download=1 -t 10
if [ $? -ne 0 ]; then endterm; exit 1; fi

echo 
TAROUT=$(tar -tf $ARCH | grep -v update-timestamp)

if [ $? -ne 0 ]; then 
	log " *** Could not read $ARCH!"; 
	log "$TAROUT"
	log 
	endterm
	exit 1
fi

log -n "updated files: "
for i in $TAROUT; do log -n "$i "; done
log

log
echo -n "Press Enter to Update, Ctrl-C to Quit. "
read junk
echo 

log " * Extracting files..."
TAROUT=`tar -zxf $ARCH 2>&1`

if [ $? -ne 0 ]; then 
	log " *** Could not unpack $ARCH!"; 
	log "$TAROUT"
	log 
	exit 1
fi

log " * Binaries successfully updated!"
log

rm $ARCH

endterm