#!/usr/bin/env bash
set -euo pipefail

# JS7 generic starter

JS7_HOME="$(cd "${0%/*}/../internal/../../bin/.." && pwd)"
export JS7_HOME
. "$JS7_HOME/bin/internal/set-context.sh"
declare classpathString java  # returned by set-context.sh
declare -a standardJavaOptions

camelName=""
kebabName=
mainClass=
config=
data=
appOptions=()
javaOptions=()
execOptions=()
processorLimit=

for arg in "$@"; do :
  case "$arg" in
    --arg0=*)
      a="${arg#*=}"
      execOptions=("-a" "${arg#*=}")
      ;;
    --camel-name=*)
      camelName="${arg#*=}"
      ;;
    --kebab-name=*)
      kebabName="${arg#*=}"
      ;;
    --main-class=*)
      mainClass="${arg#*=}"
      ;;
    --rmx-port=*)
      a="${arg#*=}"
      javaOptions+=(
        "-Dcom.sun.management.jmxremote"
        "-Dcom.sun.management.jmxremote.ssl=false"
        "-Dcom.sun.management.jmxremote.authenticate=false"
        "-Dcom.sun.management.jmxremote.port=$a")
      ;;
    --debug-port=*)
      a="${arg#*=}"
      javaOptions+=("-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=$a")
      ;;
    --java-option=*)
      a="${arg#*=}"
      javaOptions+=("$a")
      ;;
    -J*)
      a="${arg#-J}"
      javaOptions+=("$a")
      ;;
    --directory=*)
      config="${arg#*=}"/config
      data="${arg#*=}"/data
      ;;
    --config-directory=*)
      config="${arg#*=}"
      ;;
    --data-directory=*)
      data="${arg#*=}"
      ;;
    --processor-limit=*)
      processorLimit="${arg#*=}"
      ;;
    *)
      appOptions+=("$arg")
  esac
done

# $data
if [ -z "$data" ]; then data=/var/opt/js7/"$kebabName"/data; fi
if [ ! -d "$data" ]; then :
  echo "No such directory: --data-directory=$data"
  exit 1
fi
data="$(toSystemPath "$data")"

logs="$data/logs"
[ -d "$logs" ] || mkdir "$logs"

# Copy stdout and stderr to stdouterr.log
if [ -e "$logs/stdouterr.log" ]; then
  echo >>"$logs/stdouterr.log" \
    -e "\n\n━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
fi
exec &> >(exec tee -a "$logs"/stdouterr.log)

stateDir="$data/state"
[ -d "$stateDir" ] || mkdir "$stateDir"

workDir="$data/work"
[ -d "$workDir" ] || mkdir "$workDir"

# $config
if [ -z "$config" ]; then config=/var/opt/js7/"$kebabName"/config; fi
if [ ! -d "$config" ]; then :
  echo "No such directory: --config-directory=$config"
  exit 1
fi
config="$(toSystemPath "$config")"

if [ -n "$processorLimit" ]; then
  if grep -q "/" <<< "$processorLimit"; then
    # processorLimit is a quotient like 1/4
    processorLimit=$(((1000 * $processorLimit * $(nproc) + 999) / 1000))
  fi
  if [ "$processorLimit" -le "$(nproc)" ]; then
    [ "$processorLimit" -gt 0 ] || processorLimit=1
    javaOptions+=(-XX:ActiveProcessorCount="$processorLimit")
  fi
fi

javaOptions+=("-Djs7.log4j.directory=$logs")  # Used in logging configuration
if [ -f "$config/log4j2.xml" ]; then :
  javaOptions+=("-Dlog4j2.configurationFile=classpath:js7/log4j2.xml,$config/log4j2.xml")
fi

appOptions+=("--config-directory=$config")
appOptions+=("--data-directory=$data")

execute=(
  "$java"
  "${javaOptions[@]}"
  "${standardJavaOptions[@]}"
  -classpath "$classpathString"
  "$mainClass"
  "${appOptions[@]}")

log "${execute[@]}"
exec "${execOptions[@]}" "${execute[@]}" &

pid=$!
log "PID $pid"

trapped=false
trapSignal() {
  trapped=true
  log "⚡️ $1"
  kill -s "$1" $pid
}

trap "trapSignal SIGTERM" SIGTERM
trap "trapSignal SIGINT" SIGINT

exitCode=
while wait $pid; exitCode=$?; $trapped; do
  trapped=false
done
if [ $exitCode -ne 0 ]; then
  log "JS7 $camelName exited with exit code $exitCode"
fi

trap - SIGTERM SIGINT

log "JS7 $camelName terminated"
