#!/bin/sh

if [ $# -ne 2 ]; then
    echo "Usage: $0 /path/to/Orbot-v15.0.1.apk /another/Orbot-v15.0.1.apk"
    exit 1
fi

set -e
set -x

test -e "$1"
test -e "$2"

tmpdir=`mktemp -d /tmp/.compare-apks.XXXXXXXXXX`
apk1=$(basename $1)
apk2=$(basename $2)
sourcedir1=$(cd `dirname $1` && pwd)
sourcedir2=$(cd `dirname $2` && pwd)
apkname1=`echo $apk1 | sed 's,\.apk$,,'`
apkname2=`echo $apk2 | sed 's,\.apk$,,'`
dir1=$tmpdir/`echo $(dirname $1) | sed 's,[/ ],_,g'`-$apkname1
dir2=$tmpdir/`echo $(dirname $2) | sed 's,[/ ],_,g'`-$apkname2

mkdir -p $dir1/zip
cd $dir1/zip
unzip "$sourcedir1/$apk1"
cd ..
apktool d --no-res --no-src "$sourcedir1/$apk1"
mv "$apkname1" apktool
# strip the full path to the zip for the comparison
unzip -l "$sourcedir1/$apk1" | sed 's,^\(Archive:\s\s*\)/.*/,\1,' > $dir1/unzip-l.txt
unzip -lv "$sourcedir1/$apk1" | sed 's,^\(Archive:\s\s*\)/.*/,\1,' > $dir1/unzip-lv.txt
zipinfo -lv "$sourcedir1/$apk1" | sed 's,^\(Archive:\s\s*\)/.*/,\1,' > $dir1/zipinfo-lv.txt
xxd "$sourcedir1/$apk1" > $dir1/xxd
for f in $dir1/zip/assets/*/*; do
    xxd $f > $dir1/xxd-$(basename $f)
done

mkdir -p $dir2/zip
cd $dir2/zip
unzip "$sourcedir2/$apk2"
cd ..
apktool d --no-res --no-src "$sourcedir2/$apk2"
mv "$apkname2" apktool
# strip the full path to the zip for the comparison
unzip -l "$sourcedir2/$apk2" | sed 's,^\(Archive:\s\s*\)/.*/,\1,' > $dir2/unzip-l.txt
unzip -lv "$sourcedir2/$apk2" | sed 's,^\(Archive:\s\s*\)/.*/,\1,' > $dir2/unzip-lv.txt
zipinfo -lv "$sourcedir2/$apk2" | sed 's,^\(Archive:\s\s*\)/.*/,\1,' > $dir2/zipinfo-lv.txt
xxd "$sourcedir2/$apk2" > $dir2/xxd
for f in $dir2/zip/assets/*/*; do
    xxd $f > $dir2/xxd-$(basename $f)
done

if which meld > /dev/null; then
    meld $dir1 $dir2
elif which opendiff > /dev/null; then
    opendiff $dir1 $dir2
else
    echo "ERROR: meld or opendiff required for the comparison!"
fi

rm -rf $dir1 $dir2