#!/bin/bash
# info: add new database server
# options: TYPE HOST DBUSER DBPASS [MAX_DB] [CHARSETS] [TEMPLATE] [PORT]
#
# example: v-add-database-host mysql localhost alice p@$$wOrd
#
# This function add new database server to the server pool. It supports local
# and remote database servers, which is useful for clusters. By adding a host
# you can set limit for number of databases on a host. Template parameter is
# used only for PostgreSQL and has an default value "template1". You can read
# more about templates in official PostgreSQL documentation.

#----------------------------------------------------------#
#                Variables & Functions                     #
#----------------------------------------------------------#

# Argument definition
type=$1
host=$2
dbuser=$3
password=$4
HIDE=4
max_db=${5-500}
charsets=${6}
template=${7}
port=${8}

# Includes
# shellcheck source=/etc/hestiacp/hestia.conf
source /etc/hestiacp/hestia.conf
# shellcheck source=/usr/local/hestia/func/main.sh
source $HESTIA/func/main.sh
# shellcheck source=/usr/local/hestia/func/db.sh
source $HESTIA/func/db.sh
# load config file
source_conf "$HESTIA/conf/hestia.conf"

is_mysql_host_alive() {
	mycnf=$(mktemp)
	echo "[client]" > $mycnf
	echo "host='$host'" >> $mycnf
	echo "user='$dbuser'" >> $mycnf
	echo "password='$password'" >> $mycnf
	echo "port='$port'" >> $mycnf

	chmod 600 $mycnf
	mysql_out=$(mktemp)
	if [ -f '/usr/bin/mariadb' ]; then
		mariadb --defaults-file=$mycnf -e 'SELECT VERSION()' > $mysql_out 2>&1
	else
		mysql --defaults-file=$mycnf -e 'SELECT VERSION()' > $mysql_out 2>&1
	fi
	if [ "$?" -ne '0' ]; then
		echo "Error: MySQL connection to $host failed"
		rm $mycnf
		log_event "$E_CONNECT" "$ARGUMENTS"
		exit "$E_CONNECT"
	fi

	if [ -f '/usr/bin/mariadb' ]; then
		grants=$(mariadb --defaults-file=$mycnf -e 'SHOW GRANTS FOR CURRENT_USER();')
	else
		grants=$(mysql --defaults-file=$mycnf -e 'SHOW GRANTS FOR CURRENT_USER();')
	fi

	if [ "$?" -ne '0' ]; then
		echo "Error: MySQL connection to $host failed"
		rm $mycnf
		log_event "$E_CONNECT" "$ARGUMENTS"
		exit "$E_CONNECT"
	fi

	# Check allow to grant user
	check_grants=$(echo $grants | grep "WITH GRANT OPTION")
	if [ -z "$check_grants" ]; then
		echo "Error: MySQL connection to $host failed. Unable to grant other users"
		rm $mycnf
		log_event "$E_CONNECT" "$ARGUMENTS"
		exit "$E_CONNECT"
	fi
	rm $mycnf
}

is_pgsql_host_alive() {
	export PGPASSWORD="$dbpass"
	psql -h $host -U $dbuser -p $port -c "SELECT VERSION()" > /dev/null 2>&1
	if [ "$?" -ne '0' ]; then
		echo "Error: PostgreSQL connection to $host failed"
		log_event "$E_CONNECT" "$ARGUMENTS"
		exit "$E_CONNECT"
	fi
}

#----------------------------------------------------------#
#                    Verifications                         #
#----------------------------------------------------------#

args_usage='TYPE HOST DBUSER DBPASS [MAX_DB] [CHARSETS] [TPL] [PORT]'
check_args '4' "$#" "$args_usage"

if [ -z $charsets ]; then charsets="UTF8,LATIN1,WIN1250,WIN1251,WIN1252,WIN1256,WIN1258,KOI8"; fi
if [ -z $template ]; then template="template1"; fi

database_set_default_ports

is_format_valid 'host' 'dbuser' 'max_db' 'charsets' 'template' 'port'
is_system_enabled "$DB_SYSTEM" 'DB_SYSTEM'
is_type_valid "$DB_SYSTEM" "$type"
is_dbhost_new
is_password_valid
dbpass="$password"

case $type in
	mysql) is_mysql_host_alive ;;
	pgsql) is_pgsql_host_alive ;;
esac

# Perform verification if read-only mode is enabled
check_hestia_demo_mode

#----------------------------------------------------------#
#                       Action                             #
#----------------------------------------------------------#

# Generating timestamp
time_n_date=$(date +'%T %F')
time=$(echo "$time_n_date" | cut -f 1 -d \ )
date=$(echo "$time_n_date" | cut -f 2 -d \ )

# Concatenating db host string
case $type in
	mysql)
		str="HOST='$host' USER='$dbuser' PASSWORD='$dbpass'"
		str="$str CHARSETS='$charsets' MAX_DB='$max_db' U_SYS_USERS=''"
		str="$str U_DB_BASES='0' SUSPENDED='no' TIME='$time' DATE='$date' PORT='$port'"
		;;
	pgsql)
		str="HOST='$host' USER='$dbuser' PASSWORD='$dbpass'"
		str="$str CHARSETS='$charsets' TPL='$template' MAX_DB='$max_db'"
		str="$str U_SYS_USERS='' U_DB_BASES='0' SUSPENDED='no'"
		str="$str TIME='$time' DATE='$date' PORT='$port'"
		;;
esac

#----------------------------------------------------------#
#                       Hestia                             #
#----------------------------------------------------------#

# Adding host to conf
echo "$str" >> $HESTIA/conf/$type.conf
chmod 660 $HESTIA/conf/$type.conf

# Updating hestia.conf
if [ -z "$(grep DB_SYSTEM $HESTIA/conf/hestia.conf)" ]; then
	echo "DB_SYSTEM='$type'" >> $HESTIA/conf/hestia.conf
else
	db=$(echo "$DB_SYSTEM,$type" \
		| sed "s/,/\n/g" \
		| sort -r -u \
		| sed "/^$/d" \
		| sed ':a;N;$!ba;s/\n/,/g')
	sed -i "s/DB_SYSTEM=.*/DB_SYSTEM='$db'/g" $HESTIA/conf/hestia.conf
fi

# Logging
$BIN/v-log-action "system" "Info" "Database" "Added external $type database server ($host) to the system."
log_event "$OK" "$ARGUMENTS"

exit