#!/bin/bash

: "${FTB_FORCE_REINSTALL:=false}"

ftbInstallMarker=".ftb-installed"

# shellcheck source=start-utils
. "${SCRIPTS:-/}start-utils"
isDebugging && set -x
set -e

function getVersion() {
  jq -r --arg name "$1" '.targets|unique[] | select(.name == $name) | .version' version.json
}

if [[ $(getDistro) = alpine ]]; then
  logError "The FTBA installer is not supported on Alpine. Use the java8-multiarch image tag instead."
  exit 1
fi

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

if ! [[ ${FTB_MODPACK_ID} =~ [0-9]+ ]]; then
  logError "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
    logError "Unable to resolve latest modpack version ID for modpack ${FTB_MODPACK_ID}"
    exit 1
  fi
elif ! [[ ${FTB_MODPACK_VERSION_ID} =~ [0-9]+ ]]; then
  logError "FTB_MODPACK_VERSION_ID needs to be numeric"
  exit 1
fi

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

  log "Installing modpack ID ${FTB_MODPACK_ID}, version ID ${FTB_MODPACK_VERSION_ID}"
  log "This could take a while..."
  ${ftbInstaller} "${FTB_MODPACK_ID}" "${FTB_MODPACK_VERSION_ID}" --noscript --auto > ftb-installer.log
  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

forgeVersion=$(getVersion "forge")
fabricVersion=$(getVersion "fabric")
mcVersion=$(getVersion "minecraft")
VERSION="$mcVersion"
export VERSION

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

# Remap the TYPE and FAMILY based on discovered server jar
if [[ $SERVER = run.sh ]]; then
  if grep -q neoforge "$SERVER"; then
    export FAMILY=FORGE
    export TYPE=NEOFORGE
  elif grep -q forge "$SERVER"; then
    export FAMILY=FORGE
    export TYPE=FORGE
  elif grep -q fabric run.s; then
      export FAMILY=FABRIC
      export TYPE=FABRIC
  else
    logError "Unrecognized loader type in $SERVER"
    cat "$SERVER"
    exit 1
  fi

elif [[ $SERVER = forge* ]]; then
  export FAMILY=FORGE
  export TYPE=FORGE
elif [[ $SERVER = fabric* ]]; then
  export FAMILY=FABRIC
  export TYPE=FABRIC
else
  logError "Unrecognized loader type from $SERVER"
  exit 1
fi

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