#!/bin/sh

# This script ensures that ep-lite is automatically restarting after
# an error happens

# Handling Errors
#   0 silent
#   1 email
ERROR_HANDLING=0
# Your email address which should receive the error messages
EMAIL_ADDRESS="no-reply@example.com"
# Sets the minimum amount of time between the sending of error emails.
# This ensures you do not get spammed during an endless reboot loop
# It's the time in seconds
TIME_BETWEEN_EMAILS=600 # 10 minutes

# DON'T EDIT AFTER THIS LINE

pecho() { printf %s\\n "$*"; }
log() { pecho "$@"; }
error() { log "ERROR: $@" >&2; }
fatal() { error "$@"; exit 1; }

LAST_EMAIL_SEND=0
LOG="$1"

# Move to the folder where ep-lite is installed
cd "$(dirname "$0")"/..

# Check if a logfile parameter is set
[ -n "${LOG}" ] || fatal "Set a logfile as the first parameter"

shift
while true; do
  # Try to touch the file if it doesn't exist
  [ -f "${LOG}" ] || touch "${LOG}" || fatal "Logfile '${LOG}' is not writeable"

  # Check if the file is writeable
  [ -w "${LOG}" ] || fatal "Logfile '${LOG}' is not writeable"

  # Start the application
  bin/run.sh "$@" >>${LOG} 2>>${LOG}

  # Send email
  if [ "$ERROR_HANDLING" = 1 ]; then
    TIME_NOW=$(date +%s)
    TIME_SINCE_LAST_SEND=$(($TIME_NOW - $LAST_EMAIL_SEND))

    if [ "$TIME_SINCE_LAST_SEND" -gt "$TIME_BETWEEN_EMAILS" ]; then
      printf "Server was restarted at: $(date)\nThe last 50 lines of the log before the error happens:\n $(tail -n 50 "${LOG}")" | mail -s "Pad Server was restarted" "$EMAIL_ADDRESS"

      LAST_EMAIL_SEND=$TIME_NOW
    fi
  fi

  pecho "RESTART!" >>${LOG}

  # Sleep 10 seconds before restart
  sleep 10
done