#!/bin/bash
# check_nimbus - check nimbus core services and statuses
# Requirements: n/a
# Author: Tsvetan Gerov <tsvetan@worldhost.group>
# Version 0.3

# Initialize flags and error message
CRTIICAL=false
WARNING=false
ERROR_MESSAGE=""

# Check all PHP FPM services
check_fpm(){
  INSTALLED_PHP=$(ls /usr/bin/php[0-9]*)

  for PHP in $INSTALLED_PHP; do
    FPM=$(echo "$(basename $PHP)-fpm.service")
    if ! systemctl is-active $FPM >/dev/null 2>&1; then
      CRTIICAL=true
      ERROR_MESSAGE+="$FPM is down, "
    fi
  done
}

# Check Platform Agent
check_agent(){
  local NAME="platform-agent.service"
    if ! systemctl is-active $NAME >/dev/null 2>&1; then
      CRTIICAL=true
      ERROR_MESSAGE+="$NAME is down, "
    fi
}

# Check Platform Metrics service
check_platform-metrics(){
  local NAME="platform-metrics.service"
    if ! systemctl is-active $NAME >/dev/null 2>&1; then
      CRTIICAL=true
      ERROR_MESSAGE+="$NAME is down, "
    fi
}


# Check Platform Metrics Schedule service
check_platform-metrics-schedule(){
  local NAME="platform-metrics-schedule.service"
  if ! systemctl is-active $NAME >/dev/null 2>&1; then
    CRTIICAL=true
    ERROR_MESSAGE+="$NAME is down, "
  fi
}

# Check ElasticSearch
check_elastic(){
  CODE=$(curl 127.0.0.1:9200 -s -o /dev/null -w "%{http_code}")
    if [ $CODE -ne "200" ]; then
      CRTIICAL=true
      ERROR_MESSAGE+="ElasticSearch is down, "
    fi
}

# Check Redis
check_redis(){
  if ! redis-cli ping >/dev/null 2>&1; then
    CRTIICAL=true
    ERROR_MESSAGE+="Redis is down, "
  fi
}

# Perform checks
if ls /usr/bin/php[0-9]* 1>/dev/null 2>&1; then
  check_fpm
fi

if [ -f "/etc/systemd/system/platform-agent.service" ]; then
  check_agent
fi

if [ -f "/etc/systemd/system/platform-metrics.service" ]; then
  check_platform-metrics
fi

if [ -f "/etc/systemd/system/platform-metrics-schedule.service" ]; then
  check_platform-metrics-schedule
fi

if [ -f "/usr/share/elasticsearch/bin/elasticsearch" ]; then
  check_elastic
fi

if [ -f "/usr/bin/redis-server" ]; then
  check_redis
fi

# Return final state
if [ "$CRTIICAL" = true ]; then
  echo "[CRTIICAL] ${ERROR_MESSAGE%, }"
  exit 2
elif [ "$WARNING" = true ]; then
  echo "[WARNING] ${ERROR_MESSAGE%, }"
  exit 1
else
  echo "[OK] All services are running correctly."
  exit 0
fi