#!/usr/bin/env bash
set -eo pipefail
cd $(dirname $0)
whoami=$(basename $0)

if [[ $(git status -s | grep -E -v abi-perf-test | wc -l) != 0 ]]; then
    echo 1>&2 "${whoami}: git is not clean. (abi-perf-test changes ignored)"
    git status -s
    exit 2
fi

old_rev=${1-bad}
new_rev=${2-bad}

if [ "$new_rev" = "bad" ]; then
    echo 1>&2 "Usage: $whoami old-rev new-rev"
    exit 2
fi

old_rev_hash=$(git rev-parse $old_rev)
new_rev_hash=$(git rev-parse $new_rev)

cat <<EOF

Checking ABI:
* old revision: $old_rev = $old_rev_hash
* new revision: $new_rev = $new_rev_hash

EOF

work=/tmp/check-abi
if [ -d $work ]; then
   if [ ! -f $work/.abi ]; then
       echo 1>&2 "$work exists and is not ours"
       exit 2
   else
       rm -rf $work
   fi
fi
mkdir -p $work/{old,new}
touch $work/.abi

source=$PWD
repo=file://$source/.git
cd $work
git clone $repo qpdf
cd qpdf

git tag abi-old $old_rev_hash
git tag abi-new $new_rev_hash

echo "** building old version **"

git checkout abi-old
cmake -S . -B build \
  -DMAINTAINER_MODE=1 -DBUILD_STATIC_LIBS=0 -DBUILD_DOC=0 \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo
cmake --build build -j$(nproc)

echo "** saving old library and size information **"

./build/qpdf/sizes >| $work/old/sizes
cp build/libqpdf/libqpdf.so.*.* $work/old

if [ "$SKIP_PERF" != "1" ]; then
    echo "** writing performance details for old revision to $work/perf **"
    $source/performance_check --dir $source/../performance-test-files | \
        tee -a $work/perf
fi

echo "** building new version's library and sizes **"

git checkout abi-new
cmake -S . -B build \
  -DMAINTAINER_MODE=1 -DBUILD_STATIC_LIBS=0 -DBUILD_DOC=0 \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo
cmake --build build -j$(nproc) --target sizes

echo "** saving new library and size information **"

$source/check_abi check-sizes --lib build/libqpdf/libqpdf.so
./build/qpdf/sizes >| $work/new/sizes
cp build/libqpdf/libqpdf.so.*.* $work/new

echo "** running ABI comparison **"

$source/check_abi compare --old-lib $work/old/libqpdf.so.*.* \
  --new-lib build/libqpdf/libqpdf.so \
  --old-sizes $work/old/sizes --new-sizes $work/new/sizes

test_warn=0
if [ "$SKIP_TESTS" != "1" ]; then
    # Switch back to the previous release and run tests. There may be
    # some failures based on functionality change. We are looking for
    # ABI breakage.
    git checkout abi-old
    set +e
    (cd build; ctest --verbose)
    if [ $? != 0 ]; then
        test_warn=1
    fi
    set -e
fi

git checkout abi-new

if [ "$SKIP_PERF" != "1" ]; then
    echo "** writing performance details for new revision to $work/perf **"

    cmake -S . -B build \
      -DMAINTAINER_MODE=1 -DBUILD_STATIC_LIBS=0 -DBUILD_DOC=0 \
      -DCMAKE_BUILD_TYPE=RelWithDebInfo
    cmake --build build -j$(nproc)
    $source/performance_check --dir $source/../performance-test-files | \
        tee -a $work/perf
fi

if [ $test_warn = 1 ]; then
    cat <<EOF

**********************************************************************
There were some test failures; inspect to determine whether they are
ABI-related.

Check test results in $work/qpdf/build
**********************************************************************

EOF
fi