#!/usr/bin/env bash

set -o errexit
set -o pipefail

declare working_dir
working_dir="$(pwd)"

export PATH
PATH="${working_dir:?}/install/bin:${PATH:-}"

declare -a common_flags
common_flags=(
  --headers-dir1 install/old/include
  --headers-dir2 install/new/include
  --fail-no-debug-info      # Ensure debug info is present for our libs.
  --no-unreferenced-symbols # Not interested in symbols not owned by our libs.
  --leaf-changes-only       # Reduce verbosity of diagnostics.
  --impacted-interfaces     # Do not omit list of impacted interfaces.

  --ignore-soname # CXX-804: old library filenames do not include soversion in the soname.
)

declare -a abi_flags=("${common_flags[@]:?}" --suppressions cxx-abi/abignore)
declare -a noabi_flags=("${common_flags[@]:?}" --suppressions cxx-noabi/abignore)

command -V abidiff >/dev/null

mkdir cxx-abi cxx-noabi

cat >cxx-abi/abignore <<DOC
[suppress_type]
name_not_regexp = ^(bsoncxx|mongocxx)::v[[:digit:]]+::

[suppress_function]
name_not_regexp = ^(bsoncxx|mongocxx)::v[[:digit:]]+::

[suppress_variable]
name_not_regexp = ^(bsoncxx|mongocxx)::v[[:digit:]]+::
DOC

cat >cxx-noabi/abignore <<DOC
[suppress_type]
name_not_regexp = ^(bsoncxx|mongocxx)::v_noabi::

[suppress_function]
name_not_regexp = ^(bsoncxx|mongocxx)::v_noabi::

[suppress_variable]
name_not_regexp = ^(bsoncxx|mongocxx)::v_noabi::
DOC

# Ensure files have content even when abidiff produces no output.
echo "---" >>cxx-abi/bsoncxx.txt
echo "---" >>cxx-abi/mongocxx.txt
echo "---" >>cxx-noabi/bsoncxx.txt
echo "---" >>cxx-noabi/mongocxx.txt

bsoncxx_old="install/old/lib/libbsoncxx1.so"
bsoncxx_new="install/new/lib/libbsoncxx1.so"

mongocxx_old="install/old/lib/libmongocxx1.so"
mongocxx_new="install/new/lib/libmongocxx1.so"

# CXX-804: fallback to old library filename pattern.
[[ -f "${bsoncxx_old:?}" ]] || bsoncxx_old="install/old/lib/libbsoncxx.so"
[[ -f "${mongocxx_old:?}" ]] || mongocxx_old="install/old/lib/libmongocxx.so"
[[ -f "${bsoncxx_new:?}" ]] || bsoncxx_new="install/new/lib/libbsoncxx.so"
[[ -f "${mongocxx_new:?}" ]] || mongocxx_new="install/new/lib/libmongocxx.so"

# Allow task to upload the diff reports despite failed status.
echo "Comparing stable ABI for bsoncxx..."
abidiff "${abi_flags[@]:?}" "${bsoncxx_old:?}" "${bsoncxx_new:?}" >>cxx-abi/bsoncxx.txt && ret="$?" || ret="$?"
if (("$ret" & 0x03)); then # ABIDIFF_ERROR (1) | ABIDIFF_USAGE_ERROR (2)
  echo "abidiff error" >&2
  exit 1
elif (("$ret" & 0x08)); then # ABIDIFF_ABI_INCOMPATIBLE_CHANGE (8).
  declare status
  status='{"status":"failed", "type":"test", "should_continue":true, "desc":"abidiff returned an error for bsoncxx (stable)"}'
  curl -sS -d "${status:?}" -H "Content-Type: application/json" -X POST localhost:2285/task_status || true
fi
echo "Comparing stable ABI for bsoncxx... done."

# Allow task to upload the diff reports despite failed status.
echo "Comparing stable ABI for mongocxx..."
abidiff "${abi_flags[@]:?}" "${mongocxx_old:?}" "${mongocxx_new:?}" >>cxx-abi/mongocxx.txt && ret="$?" || ret="$?"
if (("$ret" & 0x03)); then # ABIDIFF_ERROR (1) | ABIDIFF_USAGE_ERROR (2)
  echo "abidiff error" >&2
  exit 1
elif (("$ret" & 0x08)); then # ABIDIFF_ABI_INCOMPATIBLE_CHANGE (8)
  declare status
  status='{"status":"failed", "type":"test", "should_continue":true, "desc":"abidiff returned an error for mongocxx (stable)"}'
  curl -sS -d "${status:?}" -H "Content-Type: application/json" -X POST localhost:2285/task_status || true
fi
echo "Comparing stable ABI for mongocxx... done."

echo "Comparing unstable ABI for bsoncxx..."
abidiff "${noabi_flags[@]:?}" "${bsoncxx_old:?}" "${bsoncxx_new:?}" >>cxx-noabi/bsoncxx.txt || true
echo "Comparing unstable ABI for bsoncxx... done."

echo "Comparing unstable ABI for mongocxx..."
abidiff "${noabi_flags[@]:?}" "${mongocxx_old:?}" "${mongocxx_new:?}" >>cxx-noabi/mongocxx.txt || true
echo "Comparing unstable ABI for mongocxx... done."

# Ensure files have content even when abidiff produces no output.
echo "---" >>cxx-abi/bsoncxx.txt
echo "---" >>cxx-abi/mongocxx.txt
echo "---" >>cxx-noabi/bsoncxx.txt
echo "---" >>cxx-noabi/mongocxx.txt