#!/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")

if [[ ! -d "$linuxcnc_root" ]]; then
    echo "missing LinuxCNC root: $linuxcnc_root" >&2
    exit 1
fi
trap 'rm -rf "$build_dir"' EXIT

common_flags=(
    -std=c++17
    -DULAPI
    -I "$(pwd)/core/wasm_shims"
    -I "$linuxcnc_root/src"
    -I "$linuxcnc_root/src/emc"
    -I "$linuxcnc_root/src/emc/nml_intf"
    -I "$linuxcnc_root/src/emc/rs274ngc"
    -I "$linuxcnc_root/src/emc/motion"
    -I "$linuxcnc_root/include"
)

"$cxx" "${common_flags[@]}" \
    -c core/wasm_shims/tooldata/tooldata_mmap_backend.cc \
    -o "$build_dir/tooldata_mmap_backend.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"

expected_exports=(
    tool_mmap_close
    tool_mmap_creator
    tool_mmap_is_random_toolchanger
    tool_mmap_user
    tooldata_find_index_for_tool
    tooldata_get
    tooldata_last_index_get
    tooldata_last_index_set
    tooldata_put
    tooldata_reset
)

printf '%s\n' "${expected_exports[@]}" | LC_ALL=C sort -u > "$build_dir/expected.exports"

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

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

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

echo "linuxcnc wasm tooldata_mmap symbol probe passed"