#!/bin/bash
set -e

if [ -z "$MYSQL_PORT_3306_TCP_ADDR" ]; then
	echo >&2 'error: missing MYSQL_PORT_3306_TCP environment variable'
	echo >&2 '  Did you forget to --link some_mysql_container:mysql ?'
	exit 1
fi

# if we're linked to MySQL, and we're using the root user, and our linked
# container has a default "root" password set up and passed through... :)
: ${ETHERPAD_DB_USER:=root}
if [ "$ETHERPAD_DB_USER" = 'root' ]; then
	: ${ETHERPAD_DB_PASSWORD:=$MYSQL_ENV_MYSQL_ROOT_PASSWORD}
fi
: ${ETHERPAD_DB_NAME:=etherpad}

ETHERPAD_DB_NAME=$( echo $ETHERPAD_DB_NAME | sed 's/\./_/g' )

if [ -z "$ETHERPAD_DB_PASSWORD" ]; then
	echo >&2 'error: missing required ETHERPAD_DB_PASSWORD environment variable'
	echo >&2 '  Did you forget to -e ETHERPAD_DB_PASSWORD=... ?'
	echo >&2
	echo >&2 '  (Also of interest might be ETHERPAD_DB_USER and ETHERPAD_DB_NAME.)'
	exit 1
fi

ETHERPAD_DB_HOST="${MYSQL_PORT_3306_TCP_ADDR}"

: ${ETHERPAD_TITLE:=Etherpad}
: ${ETHERPAD_SESSION_KEY:=$(
		node -p "require('crypto').randomBytes(32).toString('hex')")}

# Check if database already exists
RESULT=`mysql -u${ETHERPAD_DB_USER} -p${ETHERPAD_DB_PASSWORD} \
	-h${ETHERPAD_DB_HOST} --skip-column-names \
	-e "SHOW DATABASES LIKE '${ETHERPAD_DB_NAME}'"`

if [ "$RESULT" != $ETHERPAD_DB_NAME ]; then
	# mysql database does not exist, create it
	echo "Creating database ${ETHERPAD_DB_NAME}"

	mysql -u${ETHERPAD_DB_USER} -p${ETHERPAD_DB_PASSWORD} \
	      -h${ETHERPAD_DB_HOST} \
	      -e "create database ${ETHERPAD_DB_NAME}"
fi

cat << EOF > settings.json
{
  "title": "${ETHERPAD_TITLE}",
  "ip": "0.0.0.0",
  "port" : 9001,
  "sessionKey" : "${ETHERPAD_SESSION_KEY}",
  "dbType" : "mysql",
  "dbSettings" : {
                    "user"    : "${ETHERPAD_DB_USER}", 
                    "host"    : "${ETHERPAD_DB_HOST}", 
                    "password": "${ETHERPAD_DB_PASSWORD}", 
                    "database": "${ETHERPAD_DB_NAME}"
                  },
EOF

if [ $ETHERPAD_ADMIN_PASSWORD ]; then
	: ${ETHERPAD_ADMIN_USER:=admin}

cat << EOF >> settings.json
  "users": {
    "${ETHERPAD_ADMIN_USER}": {
      "password": "${ETHERPAD_ADMIN_PASSWORD}",
      "is_admin": true
    }
  },
EOF

fi

cat << EOF >> settings.json
}
EOF

exec "$@"