#!/usr/bin/env bash
# Environment variables
#   BAZEL      : the bazel binary to invoke (default: baselisk)
#   BAZEL_OPTS : the preferred bazel options used
set -eu

# Which bazel and bant to use. If unset, defaults are used.
BAZEL=${BAZEL:-bazelisk}
if ! command -v "${BAZEL}">/dev/null ; then
  BAZEL=bazel
fi

BANT="$($(dirname "$0")/get-bant-path.sh)"

# Important to run with --remote_download_outputs=all to make sure generated
# files are actually visible locally in case a remote cache (that includes
# --disk_cache) is used ( https://github.com/hzeller/bazel-gen-file-issue )
BAZEL_REMOTE_MATERIALIZE=--remote_download_outputs=all

# Bazel options
BAZEL_OPTS="${BAZEL_OPTS:--c opt ${BAZEL_REMOTE_MATERIALIZE}}"

# Tickle some build targets to fetch all dependencies and generate files,
# so that they can be seen by the users of the compilation db.
# (Note, we need to limit targets to everything below //src, otherwise
# it requires docker)
"${BAZEL}" fetch "${BAZEL_REMOTE_MATERIALIZE}" //src/...
"${BAZEL}" build -k ${BAZEL_OPTS} \
  @openmp//:omp_header \
  $("${BANT}" list-targets ... -g "genrule|tcl_encode|tcl_wrap_cc" -g "//src" -c3)

# Create compilation DB. Command 'compilation-db' would create a huge *.json file,
# but compile_flags.txt is perfectly sufficient and easier for tools to use as
# these tools will require much less memory.

"${BANT}" compile-flags -o compile_flags.txt

# Qt include files check for this
echo '-fPIC' >> compile_flags.txt

# Python include bindings.
for f in bazel-out/../../../external/*/include/python3.*/Python.h; do
  if [ -f "${f}" ]; then
    PY_INC="$(dirname "${f}")"
    echo "-I${PY_INC}"
    echo "-I$(realpath "${PY_INC}")"  # work around clangd bug
    break
  fi
done >> compile_flags.txt

# Since we don't do per-file define extraction in compile_flag.txt,
# to avoid polluting the global namespace, selectively add necessary ones here.
cat >> compile_flags.txt <<EOF
-DABC_USE_STDINT_H=1
-DABC_NAMESPACE=abc
-DGPU=false
-DBUILD_TYPE="opt"
-DBUILD_PYTHON=false
-DBUILD_GUI=true
-DSLANG_NO_YOSYS
-DSLANG_MUX_LOWERING
EOF

# If there are two styles of comp-dbs, tools might choose wrong one. Warn user.
for f in compile_commands.json build/compile_commands.json ; do
  if [ -r "$f" ]; then
    printf "\n\033[1;31mSuggest to remove old %s to not interfere with compile_flags.txt\033[0m\n\n" "$f"
  fi
done