#!/bin/bash

conffile="[@]LODEL2_CONFDIR[@]/mass_deploy.cfg"

badconf() {
	echo -e "Either the file $conffile cannot be found or it didn't contains expected informations\n\nThe conffile is expected to define MONGODB_ADMIN_USER and MONGODB_ADMIN_PASSWORD variables" >&2
	exit 1
}

mongodb_connfail() {
	echo -e "Credential from $conffile seems to be incorrect. Unable to connect on admin db" >&2
	exit 2
}

usage() {
	echo -e "Usage : $0 (N|purgedb|-h|--help)
\tWith :
\t\t- N the number of instances to create
\t\t- purgedb is to remove all created mongodb db\n"
}

test -f $conffile || badconf
#Load conffile
. $conffile
test -z "$MONGODB_ADMIN_USER" && badconf
test -z "$MONGODB_ADMIN_PASSWORD" && badconf


#Check for the presence of /usr/share/dict/words to generate random names
if [ -f '/usr/share/dict/words' ]
then
	random_name=$(sed -nE 's/^([A-Za-z0-9]+)$/\1/p' /usr/share/dict/words |shuf|head -n1)
else
	random_name=$RANDOM
fi

#Check for the presence of mongo and its conf
if hash mongo 2>/dev/null
then
	echo "Mongo found"
else
	echo "You need mongo on this host to do a mass deploy !" >&2
	exit
fi

if [ -f "/etc/mongodb.conf" ]
then
	if cat /etc/mongodb.conf  |grep -E '^ *auth *= *true *$' >/dev/null
	then
		echo "OK, auth enabled"
	else
		echo "WARNING : auth seems disabled on mongod !" >&2
	fi
else
	echo "/etc/mongodb.conf not found. Unable to check if auth is on"
fi

echo "exit" | mongo $MONGODB_HOST --quiet -u "$MONGODB_ADMIN_USER" -p "$MONGODB_ADMIN_PASSWORD" admin &>/dev/null || mongodb_connfail

if [ "$1" == 'purgedb' ]
then
	if [ -z "$MONGODB_DB_PREFIX" ]
	then
		echo -e "MONGODB_DB_PREFIX not indicated in $conffile. Using purgedb without prefix is really a bad idea... It will result in a deletion of ALL db.\nexiting."
		exit 3
	fi
	echo -n "Are you sure you want to delete all mongo database with name begining with '$MONGODB_DB_PREFIX' ? Y/n "
	read rep
	if [ "$rep" = "Y" ]
	then
		for dbname in $(echo "show dbs" | mongo -u admin -p pass admin  |grep "^$MONGODB_DB_PREFIX"|cut -f1)
		do 
			echo -e "use $dname\ndb.dropDatabase()\nexit\n" | mongo -u $MONGODB_ADMIN_USER -p $MONGODB_ADMIN_PASSWORD --quiet --authenticationDatabase admin $dbname && echo "$dbname succesfully deleted" || echo "$dbname deletion fails" >&2
		done
		echo "Done."
	else
		echo "You didn't answer 'Y' (case matters), exiting"
	fi
	exit
elif echo $1 | grep -E "[A-Za-z]" &>/dev/null
then
	usage
	exit 0
fi

#Check for the presence of pwgen for password generation
if hash pwgen 2>/dev/null
then
	echo "Using pwgen to generate passwords"
	rnd_pass_cmd='pwgen 25 1'
else
	echo "pwgen not found !!! Using \$RANDOM to generate passwords"
	rnd_pass_cmd='$RANDOM'
fi

ninstance=$1
instance=${ninstance:=50}

echo -n "You are going to create $ninstance lodel2 instances. Are you sure ? Y/n "
read rep
if [ "$rep" = "Y" ]
then
	echo "GO ! (you have 3 secs to cancel)"
	sleep 3
else
	echo "You didn't answer 'Y' (case matters), exiting"
	exit
fi

echo "Creating instances"
for i in $(seq $ninstance)
do
	iname="${random_name}_$(printf "%05d" $i)"
	slim -n $iname -c
	slim -n $iname -s --interface web
	slim -n $iname -m

	#Mongo db database creation
	dbname="${MONGODB_DB_PREFIX}_$iname"
	dbuser="lodel2_$iname"
	dbpass=$($rnd_pass_cmd)
	mongo $MONGODB_HOST -u "$MONGODB_ADMIN_USER" -p "$MONGODB_ADMIN_PASSWORD" admin <<EOF
use $dbname
db.addUser('$dbuser', '$dbpass', ['readWrite', '$dbname'])
exit
EOF
	#Append created db to instance conf
	slim -n $iname -s --datasource_connectors mongodb --host localhost --user $dbuser --password $dbpass --db_name $dbname

done