#!/usr/bin/env bash
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

CLASS=$1


if [ -z "${CLASS}" ]; then
    echo "Target Class for execution was not provided"
    exit 1
fi

# Obtain the realpath of file, even if called using a symlink
get_realpath() {
    CANDIDATE_SRC="$1"
    while [ -L "${CANDIDATE_SRC}" ]; do # resolve ${CANDIDATE_SRC} until is not a symlink
      DIR=$( cd -P "$( dirname "${CANDIDATE_SRC}" )" >/dev/null 2>&1 && pwd )
      CANDIDATE_SRC=$(readlink "${CANDIDATE_SRC}")
      # if $CANDIDATE_SRC was a relative symlink, it resolve the link
      [[ ${CANDIDATE_SRC} != /* ]] && CANDIDATE_SRC=$DIR/${CANDIDATE_SRC}
    done
    cd -P "$( dirname "${CANDIDATE_SRC}" )/.." >/dev/null 2>&1 && pwd
}

# Short circuit if the user already has this set.
if [ -z "${WAYANG_HOME}" ]; then
  export WAYANG_HOME=$( get_realpath ${BASH_SOURCE[0]} )
fi

if [ -z "${SPARK_HOME}" ]; then
  echo "The variable SPARK_HOME it needs to be setup" >&2
  exit 1
fi

#if [ -z "${FLINK_HOME}" ]; then
#  echo "The variable FLINK_HOME it needs to be setup" >&2
#  exit 1
#fi

if [ -z "${HADOOP_HOME}" ]; then
  echo "The variable HADOOP_HOME it needs to be setup" >&2
  exit 1
fi

# Find the java binary
if [ -n "${JAVA_HOME}" ]; then
  RUNNER="${JAVA_HOME}/bin/java"
else
  if [ "$(command -v java)" ]; then
    RUNNER="java"
  else
    echo "JAVA_HOME is not set" >&2
    exit 1
  fi
fi

# Find Spark jars.
if [ -d "${SPARK_HOME}" ]; then
  SPARK_JARS_DIR="${SPARK_HOME}/jars"
fi

# Find Hadoop jars.
if [ -d "${HADOOP_HOME}" ]; then
  HADOOP_JARS_DIR="${HADOOP_HOME}/share/hadoop/common/*:${HADOOP_HOME}/share/hadoop/common/lib/*"
fi


WAYANG_CODE="${WAYANG_HOME}/jars"
WAYANG_LIBS="${WAYANG_HOME}/libs"
WAYANG_CONF="${WAYANG_HOME}/conf"

# Bootstrap the classpath.
WAYANG_CLASSPATH="${WAYANG_CONF}/*:${WAYANG_CODE}/*:${WAYANG_LIBS}/*"

WAYANG_CLASSPATH="${WAYANG_CLASSPATH}:${SPARK_JARS_DIR}/*:${HADOOP_JARS_DIR}"

FLAGS=""
if [ "${FLAG_LOG}" = "true" ]; then
	FLAGS="${FLAGS} -Dlog4j.configuration=file://${WAYANG_CONF}/log4j.properties"
fi

if [ "${FLAG_WAYANG}" = "true" ]; then
	FLAGS="${FLAGS} -Dwayang.configuration=file://${WAYANG_CONF}/wayang.properties"
fi

if [ -n "${OTHER_FLAGS}" ]; then
	FLAGS="${FLAGS} ${OTHER_FLAGS}"
fi

echo "$RUNNER $FLAGS -cp "${WAYANG_CLASSPATH}" $CLASS ${@:2}"
eval "$RUNNER $FLAGS -cp "${WAYANG_CLASSPATH}" $CLASS ${@:2}"