#!/bin/bash

ftbInstallMarker=".ftb-installed"

. ${SCRIPTS:-/}start-utils
isDebugging && set -x
set -e

if ! [[ -v FTB_MODPACK_ID ]]; then
  log "ERROR FTB_MODPACK_ID is required with TYPE=FTB"
  exit 1
fi

if ! [[ ${FTB_MODPACK_ID} =~ [0-9]+ ]]; then
  log "ERROR FTB_MODPACK_ID needs to be numeric"
  exit 1
fi

if [[ ! $FTB_MODPACK_VERSION_ID ]]; then
  if ! FTB_MODPACK_VERSION_ID=$(curl -fsSL https://api.modpacks.ch/public/modpack/${FTB_MODPACK_ID} | jq -r '.versions | sort_by(.updated)[-1].id'); then
    log "ERROR unable to resolve latest modpack version ID for modpack ${FTB_MODPACK_ID}"
    exit 1
  fi
elif ! [[ ${FTB_MODPACK_VERSION_ID} =~ [0-9]+ ]]; then
  log "ERROR FTB_MODPACK_VERSION_ID needs to be numeric"
  exit 1
fi

if ! [ -f "${ftbInstallMarker}" ] || [ $(cat "${ftbInstallMarker}") != "${FTB_MODPACK_ID}=${FTB_MODPACK_VERSION_ID}" ]; then
  ftbInstaller=/data/ftb-installer
  if ! [[ -f "${ftbInstaller}" ]]; then
    log "Downloading FTB installer"
    if [ "$(uname -m)" == "aarch64" ]; then
      log "Downloading ARM installer"
      curl -fsSL https://api.modpacks.ch/public/modpack/1/1/server/arm/linux -o "${ftbInstaller}"
    else
      log "Downloading x86 installer"
      curl -fsSL https://api.modpacks.ch/public/modpack/1/1/server/linux -o "${ftbInstaller}"
    fi
    chmod +x "${ftbInstaller}"
  fi

  rm -rf forge*jar mods config libraries defaultconfigs changelogs

  log "Installing modpack ID ${FTB_MODPACK_ID}, version ID ${FTB_MODPACK_VERSION_ID}"
  ${ftbInstaller} ${FTB_MODPACK_ID} ${FTB_MODPACK_VERSION_ID} --noscript --auto
  rm -f forge*installer.jar

  echo "${FTB_MODPACK_ID}=${FTB_MODPACK_VERSION_ID}" > ${ftbInstallMarker}

  writeEula

  # some modpacks result in --w----r-- permissions
  chmod a+r version.json
else
  log "FTB modpack ID ${FTB_MODPACK_ID}, version ID ${FTB_MODPACK_VERSION_ID} is ready to go"
fi

isDebugging && cat version.json
forgeVersion=$(jq -r '.targets|unique[] | select(.name == "forge") | .version' version.json)
fabricVersion=$(jq -r '.targets|unique[] | select(.name == "fabric") | .version' version.json)
mcVersion=$(jq -r '.targets|unique[] | select(.name == "minecraft") | .version' version.json)

variants=(
  forge-${mcVersion}-${forgeVersion}.jar
  forge-${mcVersion}-${forgeVersion}-universal.jar
  forge-${mcVersion}-${forgeVersion}-${mcVersion}-universal.jar
  fabric-${mcVersion}-${fabricVersion}-server-launch.jar
)
for f in ${variants[@]}; do
  if [ -f $f ]; then
    export SERVER=$f
    break
  fi
done
if ! [ -v SERVER ]; then
  log "ERROR unable to locate the installed FTB server jar"
  ls *.jar
  exit 2
fi

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