#!/usr/bin/env bash

DIR=$(readlink -e "$(dirname "$0")")
PROD_SERVER_JAR_NAME="server-prod.jar"
NEW_SERVER_JAR_NAME="server-all.jar"

prod_pid() {
  ps -aux | tr -s " " | grep -E "\bjava -jar $PROD_SERVER_JAR_NAME\b" | cut -d " " -f2
}

PROD_PID=$(prod_pid)

#if $PROD_PID is not empty but isn't a number, something went wrong
if [ "$PROD_PID" ] && ! echo "$PROD_PID" | grep -E -q "^[0-9]+$"; then
  echo "error, unable to retrieve old server pid: $PROD_PID" >&2
  exit 2
fi

if [ "$PROD_PID" ]; then
  #will cause the old server to gracefully shutdown
  echo "shutting down old server version ..."
  kill "$PROD_PID"
  while [ ! "$(prod_pid)" ]; do sleep 1; done #sleep until process ends
fi

rm "$DIR/$PROD_SERVER_JAR_NAME"
mv "$DIR/$NEW_SERVER_JAR_NAME" "$DIR/$PROD_SERVER_JAR_NAME"

SCREEN="basket"

# create screen if not exists
if ! screen -ls | grep -q -E "\b[0-9]+\.$SCREEN\b"; then
  screen -S "$SCREEN" -d -m
fi

screen -d -r "$SCREEN" -X stuff $"$DIR/start.sh\n"
echo "server is started into $SCREEN screen."