#!/usr/bin/env bash
# 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

start_seconds=$(gdate +"%s")
start_nanos=1$(gdate +"%N")

time_taken() {
	i=$(( $(gdate +"%s") - start_seconds ))
	n=$(( $(( 1$(gdate +"%N") - start_nanos )) / 1000000 ))
	if [[ ( "$n" < 0 ) ]]; then
		i=$(( i-1 ))
		n=$(( n+1000 ))
	fi
	echo "$i.$n"
}

# utility function to log message to stderr with stating the time
log () {
	msg=$1
	enabled=1
	while test $# -gt 0; do
		case "$1" in
			"-Dlog=time") enabled=0 ;;
			"-Dlog=all") enabled=0 ;;
		esac
		shift
	done
	if [ $enabled -eq 0 ]; then
		which gdate 2>&1 > /dev/null
		gdate_installed=$?
		if [ $gdate_installed -eq 0 ]; then
			delta=$(time_taken)
			echo "[$delta] $msg" 1>&2
		fi
	fi
}

log "Checking for dependencies" $*

which javac 2>&1 > /dev/null
javac_installed=$?
if [ ! $javac_installed -eq 0 ]; then
	echo "You need to install javac 1.7 or later! CBT needs it to bootstrap from Java sources into Scala." 1>&2
	exit 1
fi

# log "cutting javac version" $*
# javac_version=$(javac -version 2>&1) # e.g. "javac 1.8.0_u60"
# javac_version_update=${javac_version/javac 1./} # e.g. "8.0_u60"
# javac_version_minor_pointed=${javac_version_update%_*} # e.g. "8.0"
# javac_version_minor=${javac_version_minor_pointed%.*} # e.g. "8"
# log "cutting javac version done" $*
# if [ ! "$javac_version_minor" -ge "7" ]; then
# 	echo "You need to install javac version 1.7 or greater!" 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 ] || [ ! $ng_server_installed -eq 0 ]; then
	nailgun_installed=1
	echo "(Note: nailgun not found. It makes CBT faster! Try 'brew install nailgun'.)" 1>&2
fi
which realpath 2>&1 > /dev/null
realpath_installed=$?
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." 1>&2
	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.)" 1>&2
fi

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

CWD=$(pwd)
_DIR=$(dirname $(readlink "$0") 2>/dev/null || dirname "$0" 2>/dev/null )

log "Find out real path. Build realpath if needed." $*

export CBT_HOME=$(dirname $($_DIR/realpath/realpath.sh $0))

export NAILGUN=$CBT_HOME/nailgun_launcher/
export TARGET=target/scala-2.11/classes/
mkdir -p $NAILGUN$TARGET

nailgun_out=$NAILGUN/target/nailgun.stdout.log
nailgun_err=$NAILGUN/target/nailgun.strerr.log
foo(){
	while test $# -gt 0; do
		case "$1" in
			"-Dlog=nailgun")
				nailgun_out=/dev/stderr
				nailgun_err=/dev/stderr
			;;
			"-Dlog=all")
				nailgun_out=/dev/stderr
				nailgun_err=/dev/stderr
			;;
		esac
		shift
	done
}

foo $@

if [ "$1" = "kill" ]; then
	echo "Stopping nailgun" 1>&2
	$NG ng-stop >> $nailgun_out 2>> $nailgun_err &
	exit 1
fi

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

log "Check for running nailgun with nc." $*

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.)" 1>&2
fi

use_nailgun=0
if [ $nailgun_installed -eq 1 ] || [ "$1" = "publishSigned" ] || [ "$2" = "publishSigned" ] || [ "$1" = "direct" ] || [ "$2" = "direct" ]; then
	use_nailgun=1
fi

if [ $use_nailgun -eq 0 ] && [ ! $server_up -eq 0 ]; then
	log "Starting up nailgun server." $*
	# try to start nailgun-server, just in case it's not up
	ng-server 127.0.0.1:$NAILGUN_PORT >> $nailgun_out 2>> $nailgun_err &
fi

stage1 () {	
	log "Checking for changes in cbt/nailgun_launcher" $*
	NAILGUN_INDICATOR=$NAILGUN$TARGET/cbt/NailgunLauncher.class
	changed=0
	for file in `ls $NAILGUN/*.java`; do
		if [ $file -nt $NAILGUN_INDICATOR ]; then changed=1; fi
	done
	compiles=0
	if [ $changed -eq 1 ]; then
		#rm $NAILGUN$TARGET/cbt/*.class 2>/dev/null # defensive delete of potentially broken class files
		echo "Compiling cbt/nailgun_launcher" 1>&2
		javac -Xlint:deprecation -Xlint:unchecked -d $NAILGUN$TARGET `ls $NAILGUN*.java`
		compiles=$?
		if [ $compiles -ne 0 ]; then
			rm $NAILGUN$TARGET/cbt/*.class 2>/dev/null # triggers recompilation next time.
			break
		fi
		if [ $use_nailgun -eq 0 ]; then
			echo "Stopping nailgun" 1>&2
			$NG ng-stop >> $nailgun_out 2>> $nailgun_err &
			sleep 1
			echo "Restarting nailgun" 1>&2
			ng-server 127.0.0.1:$NAILGUN_PORT >> $nailgun_out 2>> $nailgun_err &
			sleep 1
		fi
	fi

	log "run CBT and loop if desired. This allows recompiling CBT itself as part of compile looping." $*
	
	if [ $use_nailgun -eq 1 ]
	then
		log "Running JVM directly" $*
		# -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=localhost:5005
		java -Xmx6072m -Xss10M -cp $NAILGUN$TARGET cbt.NailgunLauncher $(time_taken) "$CWD" $*
	else
		log "Running via nailgun." $*
		for i in 0 1 2 3 4 5 6 7 8 9; do
			log "Adding classpath." $*
			$NG ng-cp $NAILGUN$TARGET >> $nailgun_out 2>> $nailgun_err
			log "Checking if nailgun is up yet." $*
			$NG cbt.NailgunLauncher check-alive >> $nailgun_out 2>> $nailgun_err
			alive=$?
			if [ $alive -eq 131 ] || [ $alive -eq 33 ]; then
			# the 33 is not working right now
			#	echo "Nailgun call failed. Try 'cbt kill' and check the error log cbt/nailgun_launcher/target/nailgun.stderr.log" 1>&2
			#elif [ $alive -eq 33 ]; then
				break
			else
				log "Nope. Sleeping for 0.5 seconds" $*
				#if [ "$i" -gt 1 ]; then
				#	echo "Waiting for nailgun to start... (In case of problems try -Dlog=nailgun or check logs in cbt/nailgun_launcher/target/*.log)" 1>&2
				#fi
			fi
			sleep 0.3
		done
		log "Running CBT via Nailgun." $*
		$NG cbt.NailgunLauncher $(time_taken) "$CWD" $*
	fi
	exitCode=$?
	log "Done running CBT." $*
}

while true; do
	stage1 $*
	if [ ! "$1" = "loop" ]; then
		break
	fi
	echo "======= Restarting CBT =======" 1>&2
done

if [ $compiles -ne 0 ]; then
	exitCode=1
fi

log "Exiting CBT" $*
exit $exitCode