#!/bin/bash
set -eu

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

requireVar VANILLA_VERSION
export TYPE=FABRIC
: "${FABRIC_INSTALLER_VERSION:=${FABRICVERSION:-LATEST}}"
: "${FABRIC_INSTALLER:=}"
: "${FABRIC_INSTALLER_URL:=}"
: "${FABRIC_LOADER_VERSION:=LATEST}"

isDebugging && set -x

log "Checking Fabric version information."
if [[ $FABRIC_INSTALLER ]]; then
  FABRIC_INSTALLER_VERSION=$(echo -n "$FABRIC_INSTALLER" | mc-image-helper hash)
elif [[ $FABRIC_INSTALLER_URL ]]; then
  FABRIC_INSTALLER_VERSION=$(echo -n "$FABRIC_INSTALLER_URL" | mc-image-helper hash)
elif [[ ${FABRIC_INSTALLER_VERSION^^} = LATEST ]]; then
  FABRIC_INSTALLER_VERSION=$(maven-metadata-release https://maven.fabricmc.net/net/fabricmc/fabric-installer/maven-metadata.xml)
fi

export SERVER=fabric-server-${VANILLA_VERSION}-${FABRIC_INSTALLER_VERSION}.jar

if [ ! \( -e ${SERVER} -a -e "server-${VANILLA_VERSION}.jar" \) ]; then

  if [[ -z $FABRIC_INSTALLER && -z $FABRIC_INSTALLER_URL ]]; then
    FABRIC_INSTALLER="fabric-installer-${FABRIC_INSTALLER_VERSION}.jar"
    FABRIC_INSTALLER_URL="https://maven.fabricmc.net/net/fabricmc/fabric-installer/${FABRIC_INSTALLER_VERSION}/fabric-installer-${FABRIC_INSTALLER_VERSION}.jar"
  elif [[ -z $FABRIC_INSTALLER ]]; then
    FABRIC_INSTALLER="fabric-installer.jar"
  elif [[ ! -e $FABRIC_INSTALLER ]]; then
    log "ERROR: the given Fabric installer doesn't exist : $FABRIC_INSTALLER"
    exit 2
  fi

  if [[ -z $FABRIC_LOADER_VERSION || ${FABRIC_LOADER_VERSION^^} = LATEST ]]; then
    log "Checking Fabric Loader version information."

    FABRIC_LOADER_VERSION=$(maven-metadata-release https://maven.fabricmc.net/net/fabricmc/fabric-loader/maven-metadata.xml)
  fi

  if [[ ! -e $FABRIC_INSTALLER ]]; then
    log "Downloading $FABRIC_INSTALLER_URL ..."
    if ! get -o "$FABRIC_INSTALLER" "$FABRIC_INSTALLER_URL"; then
      log "Failed to download from given location $FABRIC_INSTALLER_URL"
      exit 2
    fi
  fi

  log "Installing Fabric ${VANILLA_VERSION} using $FABRIC_INSTALLER with loader version $FABRIC_LOADER_VERSION"

  tries=3
  set +e
  while ((--tries >= 0)); do
    java -jar $FABRIC_INSTALLER server \
      -mcversion $VANILLA_VERSION \
      -loader $FABRIC_LOADER_VERSION \
      -downloadMinecraft \
      -dir /data
    if [[ $? == 0 ]]; then
      break
    fi
  done
  set -e
  if (($tries < 0)); then
    log "Fabric failed to install after several tries." >&2
    exit 10
  fi

  mv server.jar "server-${VANILLA_VERSION}.jar"
  mv fabric-server-launch.jar "${SERVER}"
fi

# Specify which server jar to run
echo "serverJar=server-${VANILLA_VERSION}.jar" >  fabric-server-launcher.properties

export FAMILY=FABRIC
exec "${SCRIPTS:-/}start-setupWorld" "$@"