#!/bin/bash

SERVER_DIR=/home/server/instance
cd $SERVER_DIR

: ${MINECRAFT_VERSION:='latest'}

MINECRAFT_VERSION="${MINECRAFT_VERSION,,}"
PROJECT="paper"

# prepare performance opts for java

JAVA_OPTS=" -XX:+UseG1GC -XX:+ParallelRefProcEnabled \
            -XX:MaxGCPauseMillis=200 \
            -XX:+UnlockExperimentalVMOptions \
            -XX:+DisableExplicitGC \
            -XX:+AlwaysPreTouch \
            -XX:G1NewSizePercent=30 \
            -XX:G1MaxNewSizePercent=40 \
            -XX:G1HeapRegionSize=8M \
            -XX:G1ReservePercent=20 \
            -XX:G1HeapWastePercent=5 \
            -XX:G1MixedGCCountTarget=4 \
            -XX:InitiatingHeapOccupancyPercent=15 \
            -XX:G1MixedGCLiveThresholdPercent=90 \
            -XX:G1RSetUpdatingPauseTimePercent=5 \
            -XX:SurvivorRatio=32 \
            -XX:+PerfDisableSharedMem \
            -XX:MaxTenuringThreshold=1 \
            -Daikars.new.flags=true \
            -Dusing.aikars.flags=https://mcflags.emc.gs"

URL='https://papermc.io/api/v2/projects/paper'
if [[ $MINECRAFT_VERSION == latest ]]
then
  MINECRAFT_VERSION=$(curl -s https://api.papermc.io/v2/projects/${PROJECT} | \
    jq -r '.versions[-1]')
fi

LATEST_BUILD=$(curl -s https://api.papermc.io/v2/projects/${PROJECT}/versions/${MINECRAFT_VERSION}/builds | \
    jq -r '.builds | map(select(.channel == "default") | .build) | .[-1]')

if [ "$LATEST_BUILD" != "null" ]; then
    JAR_NAME=${PROJECT}-${MINECRAFT_VERSION}-${LATEST_BUILD}.jar
    PAPERMC_URL="https://api.papermc.io/v2/projects/${PROJECT}/versions/${MINECRAFT_VERSION}/builds/${LATEST_BUILD}/downloads/${JAR_NAME}"

    rm -f *.jar

    curl -o $SERVER_DIR/server.jar $PAPERMC_URL
    echo "Download completed"
else
    echo "No stable build for version $MINECRAFT_VERSION found :("
fi

echo "eula=${EULA:-false}" > eula.txt

if [[ -n $SERVER_MEMORY ]]
then
  JAVA_OPTS="-Xms${SERVER_MEMORY} -Xmx${SERVER_MEMORY} $JAVA_OPTS"
fi

SERVER_PROPERTIES=$SERVER_DIR/server.properties
SERVER_WHITELIST=$SERVER_DIR/whitelist.json
SERVER_OPLIST=$SERVER_DIR/ops.json
WHITELIST_PREP=$SERVER_DIR/whitelist.prep
OPLIST_PREP=$SERVER_DIR/op.prep

if [ -f $SERVER_PROPERTIES ]; then
  mv $SERVER_PROPERTIES $SERVER_PROPERTIES.bkp
  rm $SERVER_PROPERTIES
  touch $SERVER_PROPERTIES
fi

if [ -f $WHITELIST_PREP ]; then
  echo -n "[" > $SERVER_WHITELIST
  cat $WHITELIST_PREP | while read u
  do
    echo "Adding $u to whitelist"

    # get uuid of user
    uuid=$(curl -s https://api.mojang.com/users/profiles/minecraft/$u | jq -r '.id')
    uuid=$(echo "${uuid:0:8}-${uuid:8:4}-${uuid:12:4}-${uuid:16:4}-${uuid:20:12}")


    if [[ $uuid == "null" ]]; then
      echo "User $u not found. Skipping."
      continue
    fi

    # write to whitelist.json
    echo -n "{\"uuid\": \"$uuid\",\"name\": \"$u\"}" >> $SERVER_WHITELIST;

  done
  echo "]" >> $SERVER_WHITELIST
  sed --in-place -e 's/}{/}, {/g' $SERVER_WHITELIST
fi

if [ -f $OPLIST_PREP ]; then
  echo -n "[" > $SERVER_OPLIST
  cat $OPLIST_PREP | while read u
  do
    echo "Adding $u to whitelist"

    # get uuid of user
    uuid=$(curl -s https://api.mojang.com/users/profiles/minecraft/$u | jq -r '.id')
    uuid=$(echo "${uuid:0:8}-${uuid:8:4}-${uuid:12:4}-${uuid:16:4}-${uuid:20:12}")


    if [[ $uuid == "null" ]]; then
      echo "User $u not found. Skipping."
      continue
    fi

    # write to whitelist.json
    echo -n "{\"uuid\": \"$uuid\",\"name\": \"$u\",\"level\": 4,\"bypassesPlayerLimit\": false}" >> $SERVER_OPLIST;

  done
  echo "]" >> $SERVER_OPLIST
  sed --in-place -e 's/}{/}, {/g' $SERVER_OPLIST
fi

if [[ -n $WHITELIST ]]; then
  echo "white-list=$WHITELIST" >> $SERVER_PROPERTIES
fi

if [[ -n $SEED ]]; then
  echo "seed=$SEED" >> $SERVER_PROPERTIES
fi

if [[ -n $MAX_PLAYERS ]]; then
  echo "max-players=$MAX_PLAYERS" >> $SERVER_PROPERTIES
fi

if [[ -n $DIFFICULTY ]]; then
  echo "difficulty=$DIFFICULTY" >> $SERVER_PROPERTIES
fi

if [[ -n $GAMEMODE ]]; then
  echo "gamemode=$GAMEMODE" >> $SERVER_PROPERTIES
fi

if [[ -n $MOTD ]]; then
  echo "motd=$MOTD" >> $SERVER_PROPERTIES
fi

if [[ -n $ENFORCE_SECURE_PROFILE ]]; then
  echo "enforce-secure-profile=$ENFORCE_SECURE_PROFILE" >> $SERVER_PROPERTIES
fi

# Start server
exec java $JAVA_OPTS -jar "server.jar" nogui