#!/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.

# The Horn command script

bin=`dirname "$0"`
bin=`cd "$bin"; pwd`

. "$bin"/horn-config.sh

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

# if no args specified, show usage
if [ $# = 0 ]; then
  echo "Usage: horn [--config confdir] COMMAND"
  echo "where COMMAND is one of:"
  echo "  jar <jar>            run a jar file"
  echo " or"
  echo "  CLASSNAME            run the class named CLASSNAME"
  echo "Most commands print help when invoked w/o parameters."
  exit 1
fi

# get arguments
COMMAND=$1
shift

if [ -f "${HORN_CONF_DIR}/horn-env.sh" ]; then
  . "${HORN_CONF_DIR}/horn-env.sh"
fi

# some Java parameters
if [ "$JAVA_HOME" != "" ]; then
  #echo "run java in $JAVA_HOME"
  JAVA_HOME=$JAVA_HOME
fi
  
if [ "$JAVA_HOME" = "" ]; then
  echo "Error: JAVA_HOME is not set."
  exit 1
fi

JAVA=$JAVA_HOME/bin/java
JAVA_HEAP_MAX=-Xmx2048m

# check envvars which might override default args
if [ "$HORN_HEAPSIZE" != "" ]; then
  #echo "run with heapsize $HORN_HEAPSIZE"
  JAVA_HEAP_MAX="-Xmx""$HORN_HEAPSIZE""m"
  #echo $JAVA_HEAP_MAX
fi

# CLASSPATH initially contains $HORN_CONF_DIR
CLASSPATH="${HORN_CONF_DIR}"
CLASSPATH=${CLASSPATH}:$JAVA_HOME/lib/tools.jar

# for developers, add Horn classes to CLASSPATH
if [ -d "$HORN_HOME/target/classes" ]; then
  CLASSPATH=${CLASSPATH}:$HORN_HOME/target/classes
fi

# so that filenames w/ spaces are handled correctly in loops below
IFS=

# for releases, add core horn jar to CLASSPATH
for f in $HORN_HOME/horn-**.jar; do
  CLASSPATH=${CLASSPATH}:$f;
done

# add libs to CLASSPATH
for f in $HORN_HOME/lib/*.jar; do
  CLASSPATH=${CLASSPATH}:$f;
done

# add user-specified CLASSPATH last
if [ "$HORN_CLASSPATH" != "" ]; then
  CLASSPATH=${CLASSPATH}:${HORN_CLASSPATH}
fi

# default log directory & file
if [ "$HORN_LOG_DIR" = "" ]; then
  HORN_LOG_DIR="$HORN_HOME/logs"
fi
if [ "$HORN_LOGFILE" = "" ]; then
  HORN_LOGFILE='horn.log'
fi

# default policy file for service-level authorization
if [ "$HORN_POLICYFILE" = "" ]; then
  HORN_POLICYFILE="horn-policy.xml"
fi

# restore ordinary behaviour
unset IFS

# figure out which class to run
if [ "$COMMAND" = "jar" ] ; then
  CLASS=org.apache.hama.util.RunJar
  BSP_OPTS="$BSP_OPTS"
else
  CLASS=$COMMAND
fi

# cygwin path translation
if $cygwin; then
  CLASSPATH=`cygpath -p -w "$CLASSPATH"`
  HORN_HOME=`cygpath -w "$HORN_HOME"`
  HORN_LOG_DIR=`cygpath -w "$HORN_LOG_DIR"`
  TOOL_PATH=`cygpath -p -w "$TOOL_PATH"`
fi

# cygwin path translation
if $cygwin; then
  JAVA_LIBRARY_PATH=`cygpath -p "$JAVA_LIBRARY_PATH"`
fi

HORN_OPTS="$HORN_OPTS -Dhorn.log.dir=$HORN_LOG_DIR"
HORN_OPTS="$HORN_OPTS -Dhorn.log.file=$HORN_LOGFILE"
HORN_OPTS="$HORN_OPTS -Dhorn.home.dir=$HORN_HOME"
HORN_OPTS="$HORN_OPTS -Dhorn.id.str=$HORN_IDENT_STRING"
HORN_OPTS="$HORN_OPTS -Dhorn.root.logger=${HORN_ROOT_LOGGER:-INFO,console}"

if [ "x$JAVA_LIBRARY_PATH" != "x" ]; then
  HORN_OPTS="$HORN_OPTS -Djava.library.path=$JAVA_LIBRARY_PATH"
fi
HORN_OPTS="$HORN_OPTS -Dhorn.policy.file=$HORN_POLICYFILE"

# run it
exec "$JAVA" $JAVA_HEAP_MAX $HORN_OPTS -classpath "$CLASSPATH" $CLASS "$@"