#!/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.
#

#
# Shell script for starting the Spark Shell REPL

cygwin=false
case "`uname`" in
  CYGWIN*) cygwin=true;;
esac

# Enter posix mode for bash
set -o posix

export FWDIR="$(cd "`dirname "$0"`"/..; pwd)"
export _SPARK_CMD_USAGE="Usage: ./bin/spark-shell [options]"

export FWDIR=$SPARK_HOME
export CARBON_SOURCE="$(cd "`dirname "$0"`"/..; pwd)"
ASSEMBLY_DIR="$CARBON_SOURCE/assembly/target/scala-2.10"
GREP_OPTIONS=
num_jars="$(ls -1 "$ASSEMBLY_DIR" | grep "^carbondata.*hadoop.*\.jar$" | wc -l)"
if [ "$num_jars" -eq "0" -a -z "$ASSEMBLY_DIR" ]; then
  echo "Failed to find Carbondata assembly in $ASSEMBLY_DIR." 1>&2
  echo "You need to build Carbondata before running this program." 1>&2
  exit 1
fi
ASSEMBLY_JARS="$(ls -1 "$ASSEMBLY_DIR" | grep "^carbondata.*hadoop.*\.jar$" || true)"
if [ "$num_jars" -gt "1" ]; then
  echo "Found multiple Carbondata assembly jars in $ASSEMBLY_DIR:" 1>&2
  echo "$ASSEMBLY_JARS" 1>&2
  echo "Please remove all but one jar." 1>&2
  exit 1
fi

ASSEMBLY_JAR="${ASSEMBLY_DIR}/${ASSEMBLY_JARS}"
export JAR="$ASSEMBLY_JAR"
export SPARK_CLASSPATH=$SPARK_CLASSPATH:$JAR
export CARBON_HOME=$CARBON_SOURCE


# SPARK-4161: scala does not assume use of the java classpath,
# so we need to add the "-Dscala.usejavacp=true" flag manually. We
# do this specifically for the Spark shell because the scala REPL
# has its own class loader, and any additional classpath specified
# through spark.driver.extraClassPath is not automatically propagated.
SPARK_SUBMIT_OPTS="$SPARK_SUBMIT_OPTS -Dscala.usejavacp=true"

function main() {
  if $cygwin; then
    # Workaround for issue involving JLine and Cygwin
    # (see http://sourceforge.net/p/jline/bugs/40/).
    # If you're using the Mintty terminal emulator in Cygwin, may need to set the
    # "Backspace sends ^H" setting in "Keys" section of the Mintty options
    # (see https://github.com/sbt/sbt/issues/562).
    stty -icanon min 1 -echo > /dev/null 2>&1
    export SPARK_SUBMIT_OPTS="$SPARK_SUBMIT_OPTS -Djline.terminal=unix"
    "$FWDIR"/bin/spark-submit "$@" --name "Carbon Spark shell" --class org.apache.spark.repl.carbon.Main $JAR 
    stty icanon echo > /dev/null 2>&1
  else
    export SPARK_SUBMIT_OPTS
    "$FWDIR"/bin/spark-submit "$@" --name "Carbon Spark shell" --class org.apache.spark.repl.carbon.Main $JAR
  fi
}

# Copy restore-TTY-on-exit functions from Scala script so spark-shell exits properly even in
# binary distribution of Spark where Scala is not installed
exit_status=127
saved_stty=""

# restore stty settings (echo in particular)
function restoreSttySettings() {
  stty $saved_stty
  saved_stty=""
}

function onExit() {
  if [[ "$saved_stty" != "" ]]; then
    restoreSttySettings
  fi
  exit $exit_status
}

# to reenable echo if we are interrupted before completing.
trap onExit INT

# save terminal settings
saved_stty=$(stty -g 2>/dev/null)
# clear on error so we don't later try to restore them
if [[ ! $? ]]; then
  saved_stty=""
fi

main "$@"

# record the exit status lest it be overwritten:
# then reenable echo and propagate the code.
exit_status=$?
onExit