#!/bin/bash

#NAME="My Roundcube"
RC_HOME=/var/www/webmail/public_html
MAIL=root
SEND_EVERY_NB_DAY=7
CACHE=$RC_HOME/../.cache_check_upgrade
CACHE_FAILED=$CACHE.failed
MAX_CHECK=10
MAX_FAILED=3
SLEEP_ON_FAILED=10
CHECK_URL=http://www.roundcube.net/download

DEBUG=0
[ "$1" == "-v" ] && DEBUG=1

[ -f "$0.local" ] && source "$0.local" && [ $DEBUG -eq 1 ] && echo "Import local config file : $0.local"

current=`egrep "define.*RCMAIL_VERSION" $RC_HOME/program/include/iniset.php|sed "s/define('.*', '\([^']*\)'.*$/\1/"`
current="`echo $current|sed 's/-rc$//'`"
[ $DEBUG -eq 1 ] && echo "Current : $current"

for i in `seq 1 $MAX_CHECK`
do
	tmpfile=`mktemp`
	wget -q $CHECK_URL -O $tmpfile
	newest=`cat $tmpfile|grep Stable|sed 's/^.*Stable.*: \(.*\)<\/td>.*$/\1/'`
	if [ -n "$newest" ]
	then
		[ $DEBUG -eq 1 ] && echo "Newest : $newest"
		rm -f $CACHE_FAILED > /dev/null 2>&1

		DOWNLOAD_URL=`cat $tmpfile|grep "$newest"|grep "tar.gz"|head -1|sed 's/.* href="\([^"]*\)" .*$/\1/'`
		[ $DEBUG -eq 1 ] && echo "Download URL : $DOWNLOAD_URL"
		[ ! -n "$DOWNLOAD_URL" ] && DOWNLOAD_URL="$CHECK_URL" && [ $DEBUG -eq 1 ] && echo "Use check URL as download URL : $DOWNLOAD_URL"

		rm -f $tmpfile > /dev/null 2>&1
		break;
	elif [ $i -eq $MAX_CHECK ]
	then
		error="Site du projet injoignable (ou structure du site modifie !!) => Impossible de recuperer le numero de la version stable actuel."
		[ $DEBUG -eq 1 ] && echo $error
		if [ -f $CACHE_FAILED ]
		then
			NB=`cat $CACHE_FAILED`
			[ $DEBUG -eq 1 ] && echo "Fichier de cache d'erreur existe : $NB echec. Max : $MAX_FAILED"
			if [ $NB -lt $MAX_FAILED ]
			then
				let NNB=NB+1
				[ $DEBUG -eq 1 ] && echo "Augmentation du nb d'erreur dans le fichier de cache d'erreur : $NB -> $NNB"
				echo -n $NNB > $CACHE_FAILED
			else
				[ $DEBUG -eq 1 ] && echo "MAX_FAILED atteint : on envoi un mail"
				echo $error|mail -s "New RoundCude release check : FAILED" $MAIL
			fi
		else
			[ $DEBUG -eq 1 ] && echo "Fichier de cache d'erreur n'existe pas : on l'initialise à 1."
			echo -n 1 > $CACHE_FAILED
		fi
		[ $DEBUG -eq 1 ] && echo "exit 1"
		exit 1
	fi
	[ $DEBUG -eq 1 ] && echo "Check failed ($i/$MAX_CHECK) : Sleep $SLEEP_ON_FAILED second before try again ..."
	sleep $SLEEP_ON_FAILED
done

if [ "$newest" != "$current" ]
then
	tmp=`mktemp`
	echo "New RoundCude release" > $tmp
	echo "=====================" >> $tmp
	echo "Current : $current" >> $tmp
	echo "Newest : $newest" >> $tmp
	echo >> $tmp
	echo "Download URL : $DOWNLOAD_URL" >> $tmp
	
	M=0
	if [ -f $CACHE ]
	then
		if [ "`diff $tmp $CACHE`" != "" -o `find $CACHE -mtime +$SEND_EVERY_NB_DAY | wc -l` -eq 1 ]
		then
			[ $DEBUG -eq 1 ] && echo "Cache trop vieux ou modif => On envoi"
			M=1
		else
			[ $DEBUG -eq 1 ] && echo "Pas de modif et cache trop recent : pas d'envoi"
		fi
	else
		[ $DEBUG -eq 1 ] && echo "Pas encore de cache => On envoi"
		M=1
	fi
	if [ $DEBUG -eq 1 -a $M -eq 1 ]
	then
		echo "Mode debug : Pas d'envoi de mail"
	fi
	if [ $M -eq 1 -a $DEBUG -ne 1 ]
	then
		cat $tmp > $CACHE
		if [ -n "$NAME" ]
		then
			S="[$NAME] New RoundCude release"
		else
			S="New RoundCude release"
		fi
		cat $tmp | mail -s "$S : $newest" $MAIL
		[ $DEBUG -eq 1 ] && echo "Mail envoyé"
	fi
	rm -f $tmp
else
	[ $DEBUG -eq 1 ] && echo "Pas de changement de version"
fi