#!/bin/bash

if [ "$START_PERF_ANALYZER" = "false" ]; then
  echo "Not starting performance-analyzer-agent"
  exit 0
fi

if [ -z "$1" ]; then
  if [ -z "$OPENSEARCH_HOME" ]; then
    echo "OPENSEARCH_HOME needs to be set or passed in as the first parameter."
    exit 1
  fi
else
  OPENSEARCH_HOME=$1
fi

if [ ! -z "$2" ]; then
  JAVA_HOME=$2
elif [ ! -z "$OPENSEARCH_JAVA_HOME" ]; then
  # Use OPENSEARCH_JAVA_HOME if present
  JAVA_HOME=$OPENSEARCH_JAVA_HOME
elif [ -z "$JAVA_HOME" ]; then
  # Nor OPENSEARCH_JAVA_HOME nor JAVA_HOME is present, failing 
  echo "OPENSEARCH_JAVA_HOME / JAVA_HOME needs to be set or passed in as the second parameter."
  exit 1
fi

echo "Using JAVA_HOME: $JAVA_HOME"
export JAVA_HOME=$JAVA_HOME

# Instead of the supervisor executing performance-analyzer-agent from the plugin location,
# we should move this to the reader. The entry-point script should be executing
# performance-analyzer-agent from the reader location.
# We need to change this file: https://github.com/opensearch-project/opensearch-build/blob/main/release/docker/config/opensearch/opensearch-docker-entrypoint.sh

if ! echo $* | grep -E '(^-d |-d$| -d |--daemonize$|--daemonize )' >/dev/null; then
  export JAVA_OPTS=-Dopensearch.path.home=$OPENSEARCH_HOME\ -Dlog4j.configurationFile=$OPENSEARCH_HOME/performance-analyzer-rca-3.0.0-SNAPSHOT/config/log4j2.xml
  exec $OPENSEARCH_HOME/performance-analyzer-rca-3.0.0-SNAPSHOT/bin/performance-analyzer-rca
else
  echo 'Starting deamon'
  export JAVA_OPTS=-Dopensearch.path.home=$OPENSEARCH_HOME\ -Dlog4j.configurationFile=$OPENSEARCH_HOME/performance-analyzer-rca-3.0.0-SNAPSHOT/config/log4j2.xml
  exec $OPENSEARCH_HOME/performance-analyzer-rca-3.0.0-SNAPSHOT/bin/performance-analyzer-rca &

  pid=$!
  PID_LOC=/tmp/performance-analyzer-agent
  if [ -n "$4" ]; then
    PID_LOC=$4
  fi

  if ! ps -p $pid >$PID_LOC; then
    exit 1
  fi
fi