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

cd "$(dirname "$0")"

linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
cxx=${CXX:-g++}
if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
    cxx="ccache $cxx"
fi
build_jobs=${CNC_SIM_BUILD_JOBS:-8}
if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
    exit 1
fi
build_dir=${CNC_SIM_BRIDGE_NATIVE_BUILD_DIR-build/bridge-native-test}
if [[ -z "$build_dir" ]]; then
    echo "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be empty" >&2
    exit 1
fi
if [[ "$build_dir" =~ [[:space:]] ]]; then
    echo "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not contain whitespace: $build_dir" >&2
    exit 1
fi
mkdir -p "$build_dir"
build_dir=$(cd "$build_dir" && pwd)
if [[ "$build_dir" == "/" ]]; then
    echo "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be the filesystem root" >&2
    exit 1
fi
exec 9>"$build_dir/bridge-native.lock"
flock 9
preflight_cache_dir="$build_dir/preflight-cache"

LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
linuxcnc_root=$(cd "$linuxcnc_root" && pwd)

common_flag_output=$(
    CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" \
        LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh \
        --no-ulapi \
        --core-include \
        --core-src
)
mapfile -t common_flags <<<"$common_flag_output"
link_flag_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-native-linkflags.sh)
mapfile -t link_flags <<<"$link_flag_output"
bridge_object_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./build-linuxcnc-native-bridge-objects.sh)
mapfile -t bridge_objects <<<"$bridge_object_output"
project_source_list="$build_dir/linuxcnc_bridge_smoke_project_sources.txt"
./list-linuxcnc-bridge-smoke-project-sources.sh > "$project_source_list"

objects=()
main_object="$build_dir/linuxcnc_canon_bridge_smoke.o"
objects+=("$main_object")
target="$build_dir/linuxcnc_canon_bridge_smoke"

bridge_signature="$build_dir/bridge-native.signature"
bridge_next_signature="$build_dir/bridge-native.signature.next"
{
    printf 'CXX=%s\n' "$cxx"
    printf 'PWD=%s\n' "$PWD"
    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
    printf 'BUILD_RULE_VERSION=1\n'
    printf 'COMMON_FLAGS='
    printf ' %s' "${common_flags[@]}"
    printf '\n'
    printf 'LINK_FLAGS='
    printf ' %s' "${link_flags[@]}"
    printf '\n'
    printf 'BRIDGE_OBJECTS:\n'
    printf '%s\n' "${bridge_objects[@]}"
} > "$bridge_next_signature"
if [[ ! -f "$bridge_signature" ]] || ! cmp -s "$bridge_signature" "$bridge_next_signature"; then
    rm -f "$build_dir"/*.d \
        "$main_object" \
        "$target"
fi
mv "$bridge_next_signature" "$bridge_signature"

bridge_makefile="$build_dir/bridge-native.mk"
{
    printf 'CXX := %s\n' "$cxx"
    printf 'COMMON_FLAGS :='
    printf ' %s' "${common_flags[@]}"
    printf '\n'
    printf 'LINK_FLAGS :='
    printf ' %s' "${link_flags[@]}"
    printf '\n'
    printf 'BRIDGE_OBJECTS :='
    printf ' %s' "${bridge_objects[@]}"
    printf '\n'
    printf 'OBJECTS :='
    printf ' %s' "${objects[@]}"
    printf '\n\n'
    printf 'DEP_FILES :=\n'
    for object in "${objects[@]}"; do
        printf 'DEP_FILES += %s.d\n' "$object"
    done
    printf '\n.PHONY: all\n'
    printf 'all: %s\n\n' "$target"

    printf '%s: core/tests/linuxcnc_canon_bridge_smoke.cpp\n' "$main_object"
    printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c core/tests/linuxcnc_canon_bridge_smoke.cpp -o %s\n\n' \
        "$main_object" "$main_object"
    printf '%s: $(BRIDGE_OBJECTS) $(OBJECTS)\n' "$target"
    printf '\t@$(CXX) $(BRIDGE_OBJECTS) $(OBJECTS) $(LINK_FLAGS) -ltooldata -o %s\n\n' "$target"
    printf '\n-include $(DEP_FILES)\n'
} > "$bridge_makefile"
make --output-sync=target -j"$build_jobs" -f "$bridge_makefile"

"$target"

echo "linuxcnc canon bridge smoke passed"