#!/bin/bash

set -e

# shellcheck source=start-utils
. "${SCRIPTS:-/}start-utils"

loadForgeVars() {
  cfgFile=${1?}
  pat='^([^#;][^=]+)=[:space:]*([^;]*)'
  while read -r line || [[ -n "$line" ]] ; do
      if [[ $line =~ $pat ]]; then
          #echo "MATCHED $line"
          k=${BASH_REMATCH[1]}
          v=${BASH_REMATCH[2]}
          case $k in
            FORGEURL)
              forgeInstallerUrl="$v"
              ;;
          esac
      fi
  done < "$cfgFile"
}

isDebugging && set -x

: "${FTB_BASE_DIR:=${CF_BASE_DIR:-/data/FeedTheBeast}}"
export FTB_BASE_DIR

legacyJavaFixerUrl=https://ftb.forgecdn.net/FTB2/maven/net/minecraftforge/lex/legacyjavafixer/1.0/legacyjavafixer-1.0.jar
export TYPE=CURSEFORGE

FTB_SERVER_MOD=${FTB_SERVER_MOD:-$CF_SERVER_MOD}

log "Looking for Feed-The-Beast / CurseForge server modpack."
requireVar FTB_SERVER_MOD

if ! isTrue "${USE_MODPACK_START_SCRIPT:-true}"; then
  if ! [ -f "${FTB_SERVER_MOD}" ]; then
    log "ERROR unable to find requested modpack file ${FTB_SERVER_MOD}"
    exit 2
  fi

  needsInstall=true
  installMarker=/data/.curseforge-installed
  if [ -f $installMarker ]; then
    if [ "$(cat $installMarker)" != "${FTB_SERVER_MOD}" ]; then
      log "Upgrading modpack"

      serverJar=$(find "${FTB_BASE_DIR}" -not -name "forge*installer.jar" -name "forge*.jar")
      if [[ "${serverJar}" ]]; then
        rm -rf "$(dirname "${serverJar}")"/{mods,*.jar,libraries,resources,scripts,config}
      fi
    else
      needsInstall=false
    fi
  fi

  if $needsInstall; then
    log "Unpacking FTB server modpack ${FTB_SERVER_MOD} ..."
    mkdir -p "${FTB_BASE_DIR}"
    unzip -o "${FTB_SERVER_MOD}" -d "${FTB_BASE_DIR}" | awk '{printf "."} END {print ""}'

    serverJar=$(find "${FTB_BASE_DIR}" -type f \( -path "*/libraries/*" -o -path "*/mods/*" \) -prune -o -name "forge*.jar" -not -name "forge*installer.jar" -print)
    if [[ -z "$serverJar" ]]; then

      if [ -f "${FTB_BASE_DIR}/settings.cfg" ]; then
        loadForgeVars "${FTB_BASE_DIR}/settings.cfg"

        if [[ $forgeInstallerUrl ]]; then
          forgeInstallerJar="${FTB_BASE_DIR}/forge-installer.jar"
          if ! curl -fsSL -o "$forgeInstallerJar" "$forgeInstallerUrl" ; then
            log "ERROR failed to download Forge installer from $forgeInstallerUrl"
            exit 2
          fi
        fi
      else
        forgeInstallerJar=$(find "${FTB_BASE_DIR}" -name "forge*installer.jar")
      fi

      if [[ -z "${forgeInstallerJar}" ]]; then
        log "ERROR Unable to find forge installer in modpack"
        log "      or download using modpack config."
        log "      Make sure you downloaded the server files."
        exit 2
      fi

      log "Installing forge server"
      dirOfInstaller=$(dirname "${forgeInstallerJar}")
      (cd "${dirOfInstaller}"; java -jar "$(basename "${forgeInstallerJar}")" --installServer)
    fi

    echo "${FTB_SERVER_MOD}" > $installMarker
  fi

  SERVER=$(find "${FTB_BASE_DIR}" -maxdepth 2 -type f \( -path "/libraries/*" -o -path "/mods/*" \) -prune -o -name "forge*.jar" -not -name "forge*installer.jar" -print)
  if [[ -z "${SERVER}" || ! -f "${SERVER}" ]]; then
    log "ERROR unable to locate installed forge server jar"
    isDebugging && find "${FTB_BASE_DIR}" -name "forge*.jar"
    exit 2
  fi
  export SERVER

  FTB_DIR=$(dirname "${SERVER}")
  export FTB_DIR

  exec "${SCRIPTS:-/}start-setupWorld" "$@"
fi

entryScriptExpr="
  -name ServerStart.sh
  -o -name serverstart.sh
  -o -name ServerStartLinux.sh
  -o -name LaunchServer.sh
  -o -name server-start.sh
  -o -name start-server.sh
  -o -name startserver.sh
  -o -name StartServer.sh
  "

if [[ -d ${FTB_BASE_DIR} ]]; then
  startScriptCount=$(find "${FTB_BASE_DIR}" $entryScriptExpr |wc -l)
  if (( startScriptCount > 1 )); then
    log "Conflicting FTB/CurseForge packages have been installed. Please cleanup ${FTB_BASE_DIR}"
    exit 2
  fi
else
  startScriptCount=0
fi

# only download and install if a mod pack isn't already installed
# also check for the start script rather than just the folder
# this allows saving just the world separate from the rest of the data directory
if [[ $startScriptCount = 0 ]]; then
  srv_modpack=${FTB_SERVER_MOD}
  if isURL "${srv_modpack}"; then
    log "Downloading modpack from ${srv_modpack}..."
    if ! srv_modpack=$(get -o /data --output-filename --skip-existing "${srv_modpack}"); then
      log "ERROR: failed to download modpack"
      exit 1
    fi
  fi
  if [[ "${srv_modpack:0:5}" == "data/" ]]; then
      # Prepend with "/"
      srv_modpack="/${srv_modpack}"
  fi
  if [[ ! "${srv_modpack:0:1}" == "/" ]]; then
      # If not an absolute path, assume file is in "/data"
      srv_modpack=/data/${srv_modpack}
  fi
  if [[ ! -f "${srv_modpack}" ]]; then
      log "FTB server modpack ${srv_modpack} not found."
      exit 2
  fi
  if [[ ! "${srv_modpack: -4}" == ".zip" ]]; then
      log "FTB server modpack ${srv_modpack} is not a zip archive."
      log "Please set FTB_SERVER_MOD to a file with a .zip extension."
      exit 2
  fi

  log "Unpacking FTB server modpack ${srv_modpack} ..."
  mkdir -p "${FTB_BASE_DIR}"
  unzip -o "${srv_modpack}" -d "${FTB_BASE_DIR}" | awk '{printf "."} END {print ""}'

  installScript=$(find "${FTB_BASE_DIR}" -maxdepth 2 -type f -name install.sh)
  if [[ "$installScript" ]]; then
    (
      cd "$(dirname "${installScript}")"
      chmod +x ./install.sh
      log "Running included install.sh"
      ./install.sh
    )
  fi
fi

if [[ $(find "${FTB_BASE_DIR}" $entryScriptExpr | wc -l) = 0 ]]; then

    # Allow up to 2 levels since some modpacks have a top-level directory named
    # for the modpack
    forgeJar=$(find "${FTB_BASE_DIR}" -maxdepth 2 -type f \( -path "/libraries/*" -o -path "/mods/*" \) -prune -o -name "forge*.jar" -not -name "forge*installer.jar" -print)
    if [[ "$forgeJar" ]]; then
      FTB_BASE_DIR=$(dirname "${forgeJar}")
      export FTB_BASE_DIR
      log "No entry script found, so building one for ${forgeJar}"
      cat > "${FTB_BASE_DIR}/ServerStart.sh" <<EOF
#!/bin/sh
. ./settings-local.sh
java \${JAVA_PARAMETERS} -Xmx\${MAX_RAM} -jar $(basename "${forgeJar}") nogui
EOF
      chmod +x "${FTB_BASE_DIR}/ServerStart.sh"
    else
      log "Please make sure you are using the server version of the FTB modpack!"
      exit 2
    fi
fi

scriptCount=$(find "${FTB_BASE_DIR}" $entryScriptExpr | wc -l)
if [[ $scriptCount = 0 ]]; then
    log "Please make sure you are using the server version of the FTB modpack!"
    exit 2
elif (( scriptCount > 1 )); then
    log "Ambiguous startup scripts in FTB modpack! Found:"
    find "${FTB_BASE_DIR}" $entryScriptExpr
    exit 2
fi

FTB_SERVER_START=$(find "${FTB_BASE_DIR}" $entryScriptExpr)
export FTB_SERVER_START

FTB_DIR=$(dirname "${FTB_SERVER_START}")
export FTB_DIR
chmod a+x "${FTB_SERVER_START}"
grep fml.queryResult=confirm "${FTB_SERVER_START}" > /dev/null || \
    sed -i 's/-jar/-Dfml.queryResult=confirm -jar/' "${FTB_SERVER_START}"
sed -i 's/.*read.*Restart now/#\0/' "${FTB_SERVER_START}"
legacyJavaFixerPath="${FTB_DIR}/mods/legacyjavafixer.jar"

if isTrue "${FTB_LEGACYJAVAFIXER}" && [ ! -e "${legacyJavaFixerPath}" ]; then
  log "Installing legacy java fixer to ${legacyJavaFixerPath}"
  if ! get -o "${legacyJavaFixerPath}" ${legacyJavaFixerUrl}; then
    log "ERROR failed to download legacy java fixer from ${legacyJavaFixerUrl}"
    exit 1
  fi
fi

if [ -e "${FTB_DIR}/FTBInstall.sh" ]; then
  pushd "${FTB_DIR}"
  sh FTBInstall.sh
  popd
elif [ -e "${FTB_DIR}/Install.sh" ]; then
  pushd "${FTB_DIR}"
  sh Install.sh
  popd
fi

exec "${SCRIPTS:-/}start-setupWorld" "$@"