#!/bin/bash -x

# Generates the 'source tarball' for JDK 8 projects and update spec infrastructure

# By default, this script regenerate source as they are currently used. 

# so if the version of sources change, this file changes and is pushed

#

# In any case you have to set PROJECT_NAME REPO_NAME and VERSION. eg:

# PROJECT_NAME=jdk8u   OR   aarch64-port 

# REPO_NAME=jdk8u60    OR   jdk8u60 

# VERSION=jdk8u60-b27  OR aarch64-jdk8u65-b17 OR for head, keyword 'tip' should do the job there

# 

# If you don't, default are used and so already uploaded tarball regenerated

# They are used to create correct name and are used in construction of sources url (unless REPO_ROOT is set)

# 

# For other useful variables see generate_source_tarball.sh

#

# the used values are then substituted to spec and sources

if [ ! "x$PR2126" = "x" ] ; then

  if [ ! -f "$PR2126" ] ; then

    echo "You have specified PR2126 as $PR2126 but it does not exists. exiting"

    exit 1

  fi

fi

set -e

if [ "x$PROJECT_NAME" = "x" ] ; then

    PROJECT_NAME="aarch64-port"

fi

if [ "x$REPO_NAME" = "x" ] ; then

    REPO_NAME="jdk8u"

fi

if [ "x$VERSION" = "x" ] ; then

    VERSION="aarch64-jdk8u172-b11"

fi

if [ "x$COMPRESSION" = "x" ] ; then

# rhel 5 needs tar.gz

    COMPRESSION=xz

fi

if [ "x$FILE_NAME_ROOT" = "x" ] ; then

    FILE_NAME_ROOT=${PROJECT_NAME}-${REPO_NAME}-${VERSION}

fi

if [ "x$PKG" = "x" ] ; then

    URL=`cat .git/config  | grep url`

    PKG=${URL##*/}

fi

if [ "x$SPEC" = "x" ] ; then

    SPEC=${PKG}.spec

fi

if [ "x$RELEASE" = "x" ] ; then

    RELEASE=1

fi

FILENAME=${FILE_NAME_ROOT}.tar.${COMPRESSION}

if [ ! -f ${FILENAME} ] ; then

echo "Generating ${FILENAME}"

. ./generate_source_tarball.sh

else 

echo "${FILENAME} already exists, using"

fi

echo "Touching spec: $SPEC"

sed -i "s/^%global\s\+project.*/%global project         ${PROJECT_NAME}/" $SPEC 

sed -i "s/^%global\s\+repo.*/%global repo            ${REPO_NAME}/" $SPEC 

sed -i "s/^%global\s\+revision.*/%global revision        ${VERSION}/" $SPEC 

# updated sources, resetting release

sed -i "s/^Release:.*/Release: $RELEASE.%{buildver}%{?dist}/" $SPEC

#https://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Levenshtein_distance#Bash

function levenshtein {

	if [ "$#" -ne "2" ]; then

		echo "Usage: $0 word1 word2" >&2

	elif [ "${#1}" -lt "${#2}" ]; then

		levenshtein "$2" "$1"

	else

		local str1len=$((${#1}))

		local str2len=$((${#2}))

		local d i j

		for i in $(seq 0 $(((str1len+1)*(str2len+1)))); do

			d[i]=0

		done

		for i in $(seq 0 $((str1len)));	do

			d[$((i+0*str1len))]=$i

		done

		for j in $(seq 0 $((str2len)));	do

			d[$((0+j*(str1len+1)))]=$j

		done

		for j in $(seq 1 $((str2len))); do

			for i in $(seq 1 $((str1len))); do

				[ "${1:i-1:1}" = "${2:j-1:1}" ] && local cost=0 || local cost=1

				local del=$((d[(i-1)+str1len*j]+1))

				local ins=$((d[i+str1len*(j-1)]+1))

				local alt=$((d[(i-1)+str1len*(j-1)]+cost))

				d[i+str1len*j]=$(echo -e "$del\n$ins\n$alt" | sort -n | head -1)

			done

		done

		echo ${d[str1len+str1len*(str2len)]}

	fi

}

# generate shenandoah hotspot

# that means supply the underlying script with new values

# to new filename.

MAIN_VERSION=$VERSION

if [ "x$VERSION" = "xtip" ] ; then

    VERSION="tip"

else

	#hardcoding version for anything else except tip

    VERSION="aarch64-shenandoah-jdk8u172-b11--shenandoah-merge-2018-05-15"

fi

MAIN_REPO_NAME=$REPO_NAME

REPO_NAME=jdk8u-shenandoah

MAIN_FILE_NAME_ROOT=$FILE_NAME_ROOT

FILE_NAME_ROOT=${PROJECT_NAME}-${REPO_NAME}-${VERSION}

FILENAME_SH=${FILE_NAME_ROOT}.tar.${COMPRESSION}

REPOS="hotspot"

if [ ! -f ${FILENAME_SH} ] ; then

echo "Generating ${FILENAME_SH}"

. ./generate_source_tarball.sh

else 

echo "${FILENAME_SH} already exists, using"

fi

sed -i "s/^Source1:.*/Source1: ${FILENAME_SH}/" $SPEC

git --no-pager diff $SPEC

# find the most similar sources name and replace it by newly generated one.

echo "Old sources"

cat sources

a_sources=`cat sources | sed "s/.*(//g" | sed "s/).*//g" | sed "s/.*\s\+//g"`

winner=""

winnerDistance=999999

for x in $a_sources ; do

  distance=`levenshtein $x ${FILENAME}`

  if [ $distance -lt $winnerDistance ] ; then

    winner=$x

    winnerDistance=$distance

  fi

done

sum=`md5sum ${FILENAME}`

sed -i "s;.*$winner;$sum;" sources

# now shenandoah hotspot

winner=""

winnerDistance=999999

for x in $a_sources ; do

  distance=`levenshtein $x ${FILENAME_SH}`

  if [ $distance -lt $winnerDistance ] ; then

    winner=$x

    winnerDistance=$distance

  fi

done

sum=`md5sum ${FILENAME_SH}`

sed -i "s;.*$winner;$sum;" sources

echo "New sources"

cat sources

a_sources=`cat sources | sed "s/.*(//g" | sed "s/).*//g" | sed "s/.*\s\+//g"`

echo "    you can get inspired by following %changelog template:"

user_name=`whoami`

user_record=$(getent passwd $user_name)

user_gecos_field=$(echo "$user_record" | cut -d ':' -f 5)

user_full_name=$(echo "$user_gecos_field" | cut -d ',' -f 1)

spec_date=`date +"%a %b %d %Y"`

# See spec:

revision_helper=`echo ${MAIN_VERSION%-*}`

updatever=`echo ${revision_helper##*u}`

buildver=`echo ${MAIN_VERSION##*-}`

echo "* $spec_date $user_full_name <$user_name@redhat.com> - 1:1.8.0.$updatever-$RELEASE.$buildver" 

echo "- updated to $MAIN_VERSION (from $PROJECT_NAME/$MAIN_REPO_NAME)"

echo "- updated to $VERSION (from $PROJECT_NAME/$REPO_NAME) of hotspot"

echo "- used $FILENAME as new sources"

echo "- used $FILENAME_SH as new sources for hotspot"

echo "    execute:"

echo "fedpkg/rhpkg new-sources "$a_sources

echo "    to upload sources"

echo "you can verify by fedpkg/rhpkg prep --arch XXXX on all architectures: x86_64 i386 i586 i686 ppc ppc64 ppc64le s390 s390x aarch64 armv7hl"