#!/usr/bin/env bash
set -euo pipefail

cd "$(dirname "$0")"

linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
cxx=${CXX:-g++}
build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_tooldata_mmap_symbols.XXXXXX")

trap 'rm -rf "$build_dir"' EXIT
LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only

tooldata_mmap_backend_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_mmap_backend.cc)
tooldata_mmap_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/tooldata/tooldata_mmap.cc)

common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
mapfile -t common_flags <<<"$common_flag_output"

"$cxx" "${common_flags[@]}" \
    -c "$tooldata_mmap_backend_shim" \
    -o "$build_dir/tooldata_mmap_backend.o"

"$cxx" "${common_flags[@]}" \
    -c "$tooldata_mmap_source" \
    -o "$build_dir/linuxcnc_tooldata_mmap.o"

nm --defined-only "$build_dir/tooldata_mmap_backend.o" \
    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
    | LC_ALL=C sort -u \
    > "$build_dir/backend.exports"

nm --defined-only "$build_dir/linuxcnc_tooldata_mmap.o" \
    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
    | LC_ALL=C sort -u \
    > "$build_dir/linuxcnc.exports"

if ! comm -23 "$build_dir/linuxcnc.exports" "$build_dir/backend.exports" > "$build_dir/missing.exports"; then
    exit 1
fi

if [[ -s "$build_dir/missing.exports" ]]; then
    echo "missing wasm tooldata mmap backend exports from LinuxCNC tooldata_mmap.cc:" >&2
    cat "$build_dir/missing.exports" >&2
    exit 1
fi

comm -13 "$build_dir/linuxcnc.exports" "$build_dir/backend.exports" > "$build_dir/unexpected.exports"
if [[ -s "$build_dir/unexpected.exports" ]]; then
    echo "unexpected wasm tooldata mmap backend exports beyond LinuxCNC tooldata_mmap.cc:" >&2
    cat "$build_dir/unexpected.exports" >&2
    exit 1
fi

echo "linuxcnc wasm tooldata_mmap symbol probe passed"