#!/usr/sbin/env bash
# Disables warning about echo not expanding escape sequences
# shellcheck disable=SC2028

function print_banner() {
  echo "         ____     ____                                          ____                    __"
  echo " /'\\_/\`\\/\\  _\`\\  /\\  _\`\\                                       /\\  _\`\\                 /\\ \\"
  echo "/\\      \\ \\ \\/\\_\\\\ \\,\\L\\_\\     __   _ __   __  __     __   _ __\\ \\ \\/\\ \\    ___     ___\\ \\ \\/'\\      __   _ __"
  echo "\\ \\ \\__\\ \\ \\ \\/_/_\\/_\\__ \\   /'__\`\\/\\\`'__\\/\\ \\/\\ \\  /'__\`\\/\\\`'__\\ \\ \\ \\ \\  / __\`\\  /'___\\ \\ , <    /'__\`\\/\\\`'__\\"
  echo " \\ \\ \\_/\\ \\ \\ \\L\\ \\ /\\ \\L\\ \\/\\  __/\\ \\ \\/ \\ \\ \\_/ |/\\  __/\\ \\ \\/ \\ \\ \\_\\ \\/\\ \\L\\ \\/\\ \\__/\\ \\ \\\\\`\\ /\\  __/\\ \\ \\/"
  echo "  \\ \\_\\\\ \\_\\ \\____/ \\ \`\\____\\ \\____\\\\ \\_\\  \\ \\___/ \\ \\____\\\\ \\_\\  \\ \\____/\\ \\____/\\ \\____\\\\ \\_\\ \\_\\ \\____\\\\ \\_\\"
  echo "   \\/_/ \\/_/\\/___/   \\/_____/\\/____/ \\/_/   \\/__/   \\/____/ \\/_/   \\/___/  \\/___/  \\/____/ \\/_/\\/_/\\/____/ \\/_/"
}

function initialize() {
  echo ":: Initializing MCSD"
  export "ARGS=--nogui "
  if [ -z "${MCSD_ENFORCE_FRESH_CACHES}" ]; then
    export "ARGS=${ARGS}--eraseCache "
  fi
  if [ -z "${MCSD_FORCE_UPGRADE}" ]; then
    export "ARGS=${ARGS}--forceUpgrade "
  fi
  if [ -z "${MCSD_SAFEMODE}" ]; then
    export "ARGS=${ARGS}--safeMode "
  fi
  if [ ! "${MCSD_AUTO_RESTART}" == "true" ] && [ ! "${MCSD_AUTO_RESTART}" == "false" ]; then
    echo ":: Warning: No/Invalid value supplied to \$MCSD_AUTO_RESTART, defaulting to false"
    export "MCSD_AUTO_RESTART=false"
  fi
  if [ ! "${MCSD_CLEAN_LOGS}" == "true" ] && [ ! "${MCSD_CLEAN_LOGS}" == "false" ]; then
    echo ":: Warning: No/Invalid value supplied to \$MCSD_CLEAN_LOGS, defaulting to false"
    export "MCSD_CLEAN_LOGS=false"
  fi
  if [ ! "${MCSD_JAVA_VERSION}" == "17" ] && [ ! "${MCSD_JAVA_VERSION}" == "11" ] && [ ! "${MCSD_JAVA_VERSION}" == "8" ]; then
    echo ":: Warning: No/Invalid java version supplied to \$MCSD_JAVA_VERSION, defaulting to java version 17"
    export "MCSD_JAVA_VERSION=17"
  fi
}

function check() {
  echo ":: Checking environment"
  if [ ! -d "/data" ]; then
    echo ":: Error: Could not locate /data directory"
    exit 1
  fi
  if [ ! -f "/data/server.jar" ]; then
    echo ":: Error: Could not locate server.jar"
    exit 1
  fi
}

function accept_eula() {
	echo "eula=true" > /data/eula.txt
}

function kill_server() {
  kill -SIGINT "$CHILDPID"
}

function run() {
  echo ":: Starting server"
  cd /data
  # We want to use ${ARGS} without using parenthesis
  # shellcheck disable=SC2086
  "/usr/lib/jvm/java-${MCSD_JAVA_VERSION}-openjdk/bin/java" -jar "/data/server.jar" ${ARGS} &
  export "CHILDPID=${!}"
  trap kill_server SIGTERM
  trap kill_server SIGINT
  wait
  case "${MCSD_AUTO_RESTART}" in
    "true")
      echo ":: Restarting server after shutdown"
      run
      ;;
    "false")
      echo ":: Ending execution"
      exit 0
      ;;
    *)
      echo ":: An internal error occured (run function, can't decide MCSD_AUTO_RESTART)"
      ;;
    esac
}

function main() {
  print_banner
  initialize
  check
  accept_eula
  if [ "${MCSD_CLEAN_LOGS}" == "true" ]; then rm -rf "/data/logs" "/data/crash-reports"; fi
  run
}

main