#!/bin/bash

# shellcheck source=start-utils
. "${SCRIPTS:-/}start-utils"
set -o pipefail
handleDebugMode

: "${PAPER_CUSTOM_JAR:=}"

ourScript="$0"
ourArgs=("$@")

# Check if we're running Folia.
if [[ -z $PAPER_PROJECT ]]; then
  PAPER_PROJECT="paper"
  PAPER_NAME="PaperMC"
fi

function handleMissingVersion() {
  expectedVersion=${VANILLA_VERSION}
  versions=$(curl -fsSL "https://papermc.io/api/v2/projects/${PAPER_PROJECT}" -H  "accept: application/json")
  if [[ $VERSION = LATEST ]]; then
    tries=0
    while ((tries++ < 5)); do
      VANILLA_VERSION=$(echo "$versions" | jq -r ".versions[$((- tries))]")
      if [[ $(curl -fsSL "https://papermc.io/api/v2/projects/${PAPER_PROJECT}/versions/${VANILLA_VERSION}" -H  "accept: application/json" \
               | jq '.builds[-1]') != null ]]; then
        log "WARN: using ${VANILLA_VERSION} since that's the latest provided by ${PAPER_NAME}"
        # re-execute the current script with the newly computed version
        exec "$ourScript" "${ourArgs[@]}"
     fi
   done
  fi
  log "ERROR: ${expectedVersion} is not published by ${PAPER_NAME}"
  log "       Set VERSION to one of the following: "
  log "       $(echo "$versions" | jq -r '.versions | join(", ")')"
  exit 1
}

if [[ $PAPER_CUSTOM_JAR ]]; then
  export SERVER="$PAPER_CUSTOM_JAR"
elif [[ $PAPER_DOWNLOAD_URL ]]; then
  export SERVER=$(getFilenameFromUrl "${PAPER_DOWNLOAD_URL}")

  if [ -f "$SERVER" ]; then
    zarg=(-z "$SERVER")
  fi

  echo "Preparing custom ${PAPER_NAME} jar from $PAPER_DOWNLOAD_URL"

  curl -fsSL -o "$SERVER" "${zarg[@]}" "${PAPER_DOWNLOAD_URL}"
else
  # Paper API v2 docs : https://papermc.io/api/docs/swagger-ui/index.html?configUrl=/api/openapi/swagger-config

  build=${PAPERBUILD:=$(curl -fsSL "https://papermc.io/api/v2/projects/${PAPER_PROJECT}/versions/${VANILLA_VERSION}" -H  "accept: application/json" \
   | jq '.builds[-1]')}
  case $? in
    0)
      ;;
    22)
      handleMissingVersion
      ;;
    *)
      echo "ERROR: unknown error while looking up ${PAPER_NAME} version=${VANILLA_VERSION}"
      exit 1
      ;;
  esac

  if [[ $build = null ]]; then
    handleMissingVersion
  fi

  export SERVER=$(curl -fsSL "https://papermc.io/api/v2/projects/${PAPER_PROJECT}/versions/${VANILLA_VERSION}/builds/${build}" -H  "accept: application/json" \
   | jq -r '.downloads.application.name')
  if [ $? != 0 ]; then
    echo "ERROR: failed to lookup ${PAPER_NAME} download file from version=${VANILLA_VERSION} build=${build}"
    exit 1
  fi

  if [ -f "$SERVER" ]; then
    zarg=(-z "$SERVER")
  fi

  log "Removing old ${PAPER_NAME} versions ..."
  shopt -s nullglob
  for f in paper-*.jar; do
    [[ $f != $SERVER ]] && rm $f
  done

  log "Downloading ${PAPER_NAME} $VANILLA_VERSION (build $build) ..."
  curl -fsSL -o "$SERVER" "${zarg[@]}" \
    "https://papermc.io/api/v2/projects/${PAPER_PROJECT}/versions/${VANILLA_VERSION}/builds/${build}/downloads/${SERVER}" \
    -H  "accept: application/java-archive"
  if [ $? != 0 ]; then
    echo "ERROR: failed to download ${PAPER_NAME} from version=${VANILLA_VERSION} build=${build} download=${SERVER}"
    exit 1
  fi
fi

# Normalize on Spigot for downstream operations
export FAMILY=SPIGOT

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