#!/bin/bash
LIBS=`find libraries/ -iname \*.jar | grep -v natives | xargs echo | sed 's/ /:/g'`
LAUNCHER="launcher.jar"
PROFILE="launcher_profiles.json"
MAIN_CLASS=net.minecraft.client.main.Main
NATIVES=`find libraries/ -iname \*.jar | grep natives`
MEM=3072m
DIR="${PWD}"

function latest()
{
  VERS=`ls -v $1 | tail -n1 | sed 's/\.json//g'`;
  echo ${VERS}
}

VERSION=$(latest versions)
ASS_VER=$(latest assets/indexes)

MAIN_JAR=versions/${VERSION}/${VERSION}.jar
NAT_DIR="`find versions/${VERSION}/${VERSION}-natives-* -type d 2>/dev/null | tail -n 1`"
if [ "x" == "x${NAT_DIR}" ]; then
  NAT_DIR="versions/${VERSION}/${VERSION}-natives-`date +'%s'`"
fi

# Set username

if [ $# = 0 ]; then
  USER=Player;
else
  USER=$1;
fi

if [ ! -d ${NAT_DIR} ]; then
  mkdir -p ${NAT_DIR}
  for f in ${NATIVES}; do
    unzip -qq -o $f -x META-INF/* -d ${NAT_DIR};
  done;
fi

# If profile exists, read UUID from it
if [ -f ${PROFILE} ]; then
  UUID=`cat ${PROFILE} | grep userid | cut -d'"' -f4 | \
    sed -e \
    's/^\([[:xdigit:]]\{8\}\)\([[:xdigit:]]\{4\}\)\([[:xdigit:]]\{4\}\)\([[:xdigit:]]\{4\}\)/\1-\2-\3-\4-/g'`;
fi

# In the case we don't have UUID, generate plausible one
# This is not required and can simply be zeroed out, but just looks good
if [ "x${UUID}" = "x" ]; then
  UUID=`uuidgen -t`;
fi

# Example of run command:
# java -cp ... -Djava.library.path=<natives dir> \
# net.minecraft.client.main.Main --username Player --version 1.7.4 \
# --gameDir /home/user/.minecraft \
# --assetsDir /home/user/.minecraft/assets \
# --assetIndex 1.7.4 --uuid 00000000-0000-0000-0000-000000000000 \
# --accessToken 89925f07ef2481ab909425df51b18ccb --userProperties {} \
# --userType legacy --demo
echo "Starting Minecraft ${VERSION}..."
echo "Player ${USER}, assets ${ASS_VER}, UUID ${UUID}"
# exit 0
java -cp ${LIBS}:${MAIN_JAR} -Xmx${MEM} -Xms${MEM} \
  -Djava.library.path=${NAT_DIR} ${MAIN_CLASS} \
  --version ${VERSION} \
  --username ${USER} \
  --gameDir ${DIR} \
  --assetsDir ${DIR}/assets \
  --assetIndex ${ASS_VER} \
  --uuid ${UUID} \
  --accessToken null \
  --userProperties {} \
  --userType legacy #> /dev/null