#!/bin/bash --

MINJARWRAPPERVER=0.5

. /usr/share/javahelper/jh_lib.sh

set -e

syntax()
{
   echo -e "Usage: jh_depends [options]"
   echo -e "Options:"
   echo -e "\t-h --help: show this text"
   echo -e "\t-V --version: print the version"
   echo -e "\t-p<package> --package=<package>: package to act on (default=all)"
   echo -e "\t-P<packagedir> --tmpdir=<package>: package directory (default=\$CWD/debian/package)"
   echo -e "\t-v --verbose: show more information while running"
   echo -e "\t-i --indep: work on all indep packages"
   echo -e "\t-a --arch: work on all arch-specific packages"
   echo -e "\t-s --same-arch: alias of --arch for compatibility with debhelper"
   echo -e "\t-n --no-act: don't actually do anything, just print the results"
   echo -e "\t-j[<jvm>] --jvm[=<jvm>]: Options are: default, headless, open, open6, open7, open8, open9, open10 or open11. Can be a space-separated list."
   echo -e "\t-X<package> --exclude=<package>: don't add this package to depends"
   echo -e ""
   echo -e "Note: \"headless\" (for --jvm) affects other values and alternatives (e.g. java8-runtime becomes"
   echo -e " java8-runtime-headless) and \"default\" cannot be used with any other value except \"headless\""
   echo -e " If \"headless\" is the only value given then it is assumed to be \"headless default\""
   exit 1
}

# getclassversion <current> <path to classes>
# returns the max of <current> and <all the classes under the path>
getclassversion()
{
	current=$1
	classes="$2"
	for i in `find "$classes" -name "*.class"`; do
		new=$(hexdump -n 1 -s 7 -e '/1 "%u"' "$i")
		if (( $current < $new )); then
			current=$new
		fi
	done
	echo $current
}

# getalternatedepends <version>
getalternatedepends()
{
	if (( $1 < 50 )); then
		echo "| java5-runtime$2 | java6-runtime$2 | java7-runtime$2 | java8-runtime$2 | java9-runtime$2 | java10-runtime$2 | java11-runtime$2"
	elif [ "$1" == "50" ]; then
		echo "| java6-runtime$2 | java7-runtime$2 | java8-runtime$2 | java9-runtime$2 | java10-runtime$2 | java11-runtime$2"
	elif [ "$1" == "51" ]; then
		echo "| java7-runtime$2 | java8-runtime$2 | java9-runtime$2 | java10-runtime$2 | java11-runtime$2"
	elif [ "$1" == "52" ]; then
		echo "| java8-runtime$2 | java9-runtime$2 | java10-runtime$2 | java11-runtime$2"
	elif [ "$1" == "53" ]; then
		echo "| java9-runtime$2 | java10-runtime$2 | java11-runtime$2"
	elif [ "$1" == "54" ]; then
		echo "| java10-runtime$2 | java11-runtime$2"
	elif [ "$1" == "55" ]; then
		echo "| java11-runtime$2"
	else
		echo "Warning: Class version too new to recognise ($1), might not run with any JVMs" 1>&2
	fi
}

function home-to-jvm()
{
	JHOME="$1"
	if echo $JHOME | grep headless >/dev/null; then
		JVM="$JVM headless"
	fi
	if echo $JHOME | grep default >/dev/null; then
		JVM="$JVM default"
	fi
	if echo $JHOME | grep 6-openjdk >/dev/null; then
		JVM="$JVM open6"
	fi
	if echo $JHOME | grep 7-openjdk >/dev/null; then
		JVM="$JVM open7"
	fi
	if echo $JHOME | grep 8-openjdk >/dev/null; then
		JVM="$JVM open8"
	fi
	if echo $JHOME | grep 9-openjdk >/dev/null; then
		JVM="$JVM open9"
	fi
	if echo $JHOME | grep 10-openjdk >/dev/null; then
		JVM="$JVM open10"
	fi
	if echo $JHOME | grep 11-openjdk >/dev/null; then
		JVM="$JVM open11"
	fi
	echo "$JVM"
}

ARGS="X exclude p package P tmpdir v verbose i indep a arch s same-arch n no-act j jvm" parseargs "$@"

VERBOSE="`getarg v verbose`"

dh_testdir

TEMPDIR=`mktemp -d`
OLDDIR=`pwd`

WRAPPER=

EXCLUDES="`getarg X exclude`"

PACKAGES=`findpackages`
for p in $PACKAGES; do

   PACKAGEDIR="`getarg P tmpdir`"
   if [ -z "$PACKAGEDIR" ]; then
      PACKAGEDIR="`pwd`/debian/$p"
   else
      PACKAGEDIR="`readlink -f $PACKAGEDIR`"
   fi

   if [ ! -d "$PACKAGEDIR" ]; then
      continue
   fi

   if [ -n "$VERBOSE" ]; then
      echo "Searching $PACKAGEDIR for $p"
   fi

   # Assume all links to jars points to real jars, so we do not
   #  have to process links... hopefully.
   JARS=`find $PACKAGEDIR -type f -a -name '*.jar'`

   if [ -n "$VERBOSE" ]; then
      echo "Searching" $JARS
   fi

   [ -n "$TEMPDIR" ] && rm -rf "$TEMPDIR/"*
   cd "$TEMPDIR"

   JARDEPS=""
   classversion=0
   for i in $JARS; do
      if [ -x "$i" ]; then
         WRAPPER="true"
      fi
      jar xf "$i"
		classversion=`getclassversion $classversion .`
      JARDEPS="$JARDEPS `extractline META-INF/MANIFEST.MF Class-Path`"
      if grep ^Main-Class META-INF/MANIFEST.MF >/dev/null; then
         JHOME="`extractline META-INF/MANIFEST.MF Debian-Java-Home`"
         JVM="`home-to-jvm "$JHOME"`"
      fi
      [ -n "$TEMPDIR" ] && rm -rf "$TEMPDIR/"*
   done
   JARDEPS=`echo $JARDEPS | xargs -n1 | LC_ALL=C sort -u`

   if [ -n "$VERBOSE" ]; then
      echo "Found Jars:" $JARDEPS
   fi

   LOCALDEBDEPS=""
   DEBDEPS=""
   NEWJARDEPS=""
   for i in $JARDEPS; do
       # Strip out leading "file://"
       i="$(echo "$i" | perl -pe 's{^\s*file://*}{/}')"
      if [ -e "$i" ]; then
         realjar="`readlink -f "$i"`"
      elif [ -e "/usr/share/java/$i" ]; then
         realjar="`readlink -f "/usr/share/java/$i"`"
      else
         realjar="$i"
      fi

      for j in $PACKAGES; do
         if ! grep "$j" <<< "$EXCLUDES" > /dev/null; then
            if [ -n "$VERBOSE" ]; then
               echo "Checking: " $OLDDIR/debian/$j$realjar
            fi
            if [ -f $OLDDIR/debian/$j$realjar ]; then
               LOCALDEBDEPS="$LOCALDEBDEPS $j (>= \${source:Version})"
            else
               NEWJARDEPS="$NEWJARDEPS $realjar"
            fi
         else
            if [ -n "$VERBOSE" ]; then
               echo "Excluding package $j from depends"
            fi
         fi
      done
   done

   if [ -n "$NEWJARDEPS" ]; then
      DEBDEPS="$DEBDEPS `dpkg -S $NEWJARDEPS 2>/dev/null | grep -v ^$p: | cut -d: -f1 | LC_ALL=C sort -u`"
   fi

   REALDEBDEPS=""
   for d in $DEBDEPS; do
      if grep "$d" <<< "$EXCLUDES" > /dev/null; then
         echo "Excluding package $d from depends"
      else
         REALDEBDEPS="$REALDEBDEPS $d"
      fi
   done
   DEBDEPS="$LOCALDEBDEPS $REALDEBDEPS"

   if [ -n "$VERBOSE" ]; then
      echo "Found Debs:" $DEBDEPS
   fi
   if [ -n "$WRAPPER" ]; then
      DEBDEPS="jarwrapper (>=0.5) $DEBDEPS"
   fi
   JVMDEPS=
   if [ -n "`getarg j jvm`" ] && [ -z "$JVM" ]; then
      JVM="`getarg j jvm`"
   fi

   if [ -n "$WRAPPER" ] && [ -z "$JVM" ]; then
      if [ -n "$JAVA_HOME" ]; then
         JVM="`home-to-jvm "$JAVA_HOME"`"
      else
         JVM="default"
      fi
   fi

   if [ -n "$JVM" ]; then
      if echo $JVM | grep -q headless ; then
         headless="-headless"
         JVM=`echo $JVM | sed s/headless//g`
         # Check if JVM is empty now (or just whitespace)
         [ -z "`echo $JVM | sed s/\s*//g`" ] && JVM="default"
      fi
      for j in $JVM; do
	 alternateversiondeps=`getalternatedepends $classversion $headless`
         if [ -n "$JVMDEPS" ]; then
            JVMDEPS="$JVMDEPS |"
         fi
         case "$j" in
            "default"|"true")
               JVMDEPS="default-jre$headless $alternateversiondeps "
               break
               ;;
            "open11")
               JVMDEPS="$JVMDEPS openjdk-11-jre$headless "
               ;;
            "open10")
               JVMDEPS="$JVMDEPS openjdk-10-jre$headless "
               ;;
            "open9")
               JVMDEPS="$JVMDEPS openjdk-9-jre$headless "
               ;;
            "open8")
               JVMDEPS="$JVMDEPS openjdk-8-jre$headless "
               ;;
            "open7")
               JVMDEPS="$JVMDEPS openjdk-7-jre$headless "
               ;;
            "open6")
               JVMDEPS="$JVMDEPS openjdk-6-jre$headless "
               ;;
            "open")
               JVMDEPS="$JVMDEPS openjdk-9-jre$headless | openjdk-8-jre$headless "
               ;;
            *)
               echo "Warning: unknown JVM type: $j"
               ;;
         esac
      done
      if [ -n "$JVMDEPS" ]; then
         JVMDEPS="$JVMDEPS, "
      fi
   fi
   cd "$OLDDIR"
   # Do not rely on the presence of /usr/share/doc, it might have been removed already and
   # it is a policy voliation to do so. #632620
   if [ -d "$PACKAGEDIR/usr/share/doc" ] ; then
       API=`find "$PACKAGEDIR/usr/share/doc" -type f -name 'package-list' -exec dirname {} \;`
       DOC_REC=`/usr/share/javahelper/jh_scanjavadoc $API`
   else
       API=''
       DOC_REC=''
   fi

   if [ -n "$VERBOSE" ]; then
      echo "Adding substvars:" "java:Depends=$JVMDEPS`echo $DEBDEPS | sed 's/\([a-zA-Z0-9_.+-]*\( *([^)]*)\)\{0,1\}\)/\1, /g;s/, *$//'`" \
           "java:Recommends=$DOC_REC"
   fi

   if [ -z "`getarg n no-act`" ]; then
      echo "java:Depends=$JVMDEPS`echo $DEBDEPS | sed 's/\([a-zA-Z0-9_.+-]*\( *([^)]*)\)\{0,1\}\)/\1, /g;s/, *$//'`" >> debian/$p.substvars
      echo "java:Recommends=$DOC_REC" >> debian/$p.substvars
   else
      echo "java:Depends=$JVMDEPS`echo $DEBDEPS | sed 's/\([a-zA-Z0-9_.+-]*\( *([^)]*)\)\{0,1\}\)/\1, /g;s/, *$//'`"
      echo "java:Recommends=$DOC_REC"
   fi

   unset PACKAGEDIR

done
rm -rf "$TEMPDIR"