#!/usr/bin/env bash
#gdate +"%T.%N"
# Launcher bash script that bootstraps CBT from source.
# (Some of the code for reporting missing dependencies and waiting for nailgun to come up is a bit weird.)
# This is inentionally kept as small as posible.
# Welcome improvements to this file:
# - reduce code size through better ideas
# - reduce code size by moving more of this into type-checked Java/Scala code (if possible without performance loss).
# - reduction of dependencies
# - performance improvements

which javac 2>&1 > /dev/null
javac_installed=$?
if [ ! $javac_installed -eq 0 ]; then
	echo "You need to install javac! CBT needs it to bootstrap from Java sources into Scala." 2>&1
	exit 1
fi
javac_version=$(javac -version 2>&1 | cut -d ' ' -f 2)
javac_version_minor=$(echo -n $javac_version | cut -d '.' -f 2)
if [ ! "$javac_version_minor" -ge "8" ]; then
	echo "You need to install javac version 1.8 or greater! CBT currently relies on Java 8." 2>&1
	echo "Current javac version is $javac_version" 2>&1
	exit 1
fi
which ng 2>&1 > /dev/null
ng_installed=$?
which ng-server 2>&1 > /dev/null
ng_server_installed=$?
nailgun_installed=0
if [ ! $ng_installed -eq 0 ] || [ ! $ng_server_installed -eq 0 ]; then
	nailgun_installed=1
	echo "(Note: nailgun not found. It makes CBT faster! Try 'brew install nailgun'.)" 2>&1
fi
which realpath 2>&1 > /dev/null
realpath_installed=$?
which gcc 2>&1 > /dev/null
gcc_installed=$?
if [ ! $realpath_installed -eq 0 ] && [ ! $gcc_installed -eq 0 ]; then
	echo "You need realpath or gcc installed! CBT needs it to locate itself reliably." 2>&1
	exit 1
fi

which gpg 2>&1 > /dev/null
gpg_installed=$?
if [ ! $gpg_installed -eq 0 ]; then
	echo "(Note: gpg not found. In order to use publishSigned you'll need it.)" 2>&1
fi

NAILGUN_PORT=4444
NG="ng --nailgun-port $NAILGUN_PORT"

CWD=$(pwd)
_DIR=$(dirname $(readlink "$0") 2>/dev/null || dirname "$0" 2>/dev/null )
# find out real path. Build realpath if needed.
export CBT_HOME=$(dirname $($_DIR/realpath/realpath.sh $0))

#gdate +"%T.%N"
export SCALA_VERSION="2.11.7"
export NAILGUN=$CBT_HOME/nailgun_launcher/
export STAGE1=$CBT_HOME/stage1/
export TARGET=target/scala-2.11/classes/
INDICATOR=$STAGE1$TARGET/cbt/Stage1.class

mkdir -p $NAILGUN$TARGET
mkdir -p $STAGE1$TARGET

which nc 2>&1 > /dev/null
nc_installed=$?

server_up=1
if [ $nc_installed -eq 0 ]; then
	nc -z -n -w 1 127.0.0.1 $NAILGUN_PORT > /dev/null 2>&1
	server_up=$?
else
	echo "(Note: nc not found. It will make slightly startup faster.)" 2>&1
fi

if [ ! $nc_installed -eq 0 ] || [ ! $server_up -eq 0 ]; then
	echo "Starting up nailgun" 2>&1
	# try to start nailgun-server, just in case it's not up
	ng-server 127.0.0.1:$NAILGUN_PORT >> $NAILGUN/target/nailgun.stdout.log 2>> $NAILGUN/target/nailgun.stderr.log & 
fi

#gdate +"%T.%N"
# fetch / find scala jars
export SCALA_CLASSPATH=`$CBT_HOME/bootstrap_scala/bootstrap_scala $SCALA_VERSION`
if [ ! $? -eq 0 ]; then echo "Problem with bootstrap_scala" 2>&1; exit 1; fi

#gdate +"%T.%N"
# detect source changes in CBT itself
changed=0
for file in `ls $NAILGUN/* $STAGE1/*`
do  
	if [ $file -nt $INDICATOR ]
    then changed=1
    fi
done

compiles1=0
compiles2=0

# recompile CBT itself if needed
if [ ! $changed -eq 0 ]
then
	echo "Recompiling CBT. Detected source changes..." 1>&2
	javac -Xlint:deprecation -d $NAILGUN$TARGET `ls $NAILGUN/*.java`
	compiles1=$?
	
	rm $STAGE1$TARGET/cbt/*.class 2>/dev/null
	
	java -Xmx256M -Xms32M\
		-Xbootclasspath/a:$SCALA_CLASSPATH\
		-Dscala.usejavacp=true\
		-Denv.emacs=\
		scala.tools.nsc.Main\
		-deprecation\
		-feature\
		-cp $NAILGUN$TARGET\
		-d $STAGE1$TARGET\
		`ls $STAGE1/*.scala`
	compiles2=$?
	echo "Stopping nailgun" 2>&1
	$NG ng-stop >> $NAILGUN/target/nailgun.stdout.log 2>> $NAILGUN/target/nailgun.stderr.log & 
	echo "Restarting nailgun" 2>&1
	ng-server 127.0.0.1:$NAILGUN_PORT >> $NAILGUN/target/nailgun.stdout.log 2>> $NAILGUN/target/nailgun.stderr.log & 
fi

build ()
{ 
	CP=$STAGE1$TARGET:$SCALA_CLASSPATH
	if [ $nailgun_installed -eq 1 ] || [ "$1" = "publishSigned" ] || [ "$2" = "publishSigned" ] || [ "$1" = "direct" ] || [ "$2" = "direct" ]
	then
		#echo "Running jvm directly" 1>&2
		# -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=localhost:5005
		java -cp $NAILGUN$TARGET cbt.NailgunLauncher $mainClass $CP "$CWD" $*
	else
		#echo "Running via nailgun" 1>&2
		#gdate +"%T.%N"
		$NG ng-cp $NAILGUN$TARGET >> $NAILGUN/target/nailgun.stdout.log 2>> $NAILGUN/target/nailgun.stderr.log
		#gdate +"%T.%N"
		$NG cbt.NailgunLauncher cbt.CheckAlive $CP "$CWD" $* >> $NAILGUN/target/nailgun.stdout.log 2>> $NAILGUN/target/nailgun.stderr.log
		#gdate +"%T.%N"
		alive=$?
		while [[ $alive -ne 33 ]]
		do
			echo "Waiting for nailgun to start..." 1>&2
			sleep 1
			$NG ng-cp $NAILGUN$TARGET >> $NAILGUN/target/nailgun.stdout.log 2>> $NAILGUN/target/nailgun.stderr.log
			$NG cbt.NailgunLauncher cbt.CheckAlive $CP "$CWD" $* >> $NAILGUN/target/nailgun.stdout.log 2>> $NAILGUN/target/nailgun.stderr.log
			alive=$?
		done
		#gdate +"%T.%N"
		$NG cbt.NailgunLauncher $mainClass $CP "$CWD" $*
		#gdate +"%T.%N"

	fi
} 
#gdate +"%T.%N"
# run CBT and loop if desired. This allows recompiling CBT itself as part of compile looping.
if [ $compiles1 -eq 0 ] && [ $compiles2 -eq 0 ]
then
	if [ "$1" = "admin" ]; then
		mainClass=cbt.AdminStage1
	else
		mainClass=cbt.Stage1
	fi
	build $*
	if [ "$1" = "loop" ]
	then
		while true; do
			echo "======= Restarting CBT =======" 2>&1
			build $*
		done
	fi
fi
#gdate +"%T.%N"