#!/usr/bin/env bash
set -Eeuo pipefail
source /opt/rust-package-builder/scripts/lib.sh

SOURCE_DIR=${1:?source path required}
OUTPUT_BINARY=${2:?output binary required}
BINARY_NAME=${3:?binary name required}
WORK_DIR=${4:?work directory required}

BUILD_SOURCE="$WORK_DIR/freebsd-source"
rm -rf "$BUILD_SOURCE"
mkdir -p "$BUILD_SOURCE" "$(dirname "$OUTPUT_BINARY")"

rsync -a --delete \
    --exclude='.git/' \
    --exclude='target/' \
    "$SOURCE_DIR/" "$BUILD_SOURCE/"

if [[ "${APPLY_FREEBSD_PATCHES:-1}" == "1" ]]; then
    /opt/rust-package-builder/scripts/apply-freebsd-patches.sh "$BUILD_SOURCE"
else
    log "FreeBSD/OPNsense source patches disabled"
fi

FREEBSD_TARGET_VERSION=${FREEBSD_RELEASE%-RELEASE}
export CFLAGS_x86_64_unknown_freebsd="--target=x86_64-unknown-freebsd${FREEBSD_TARGET_VERSION} --sysroot=/opt/freebsd-sysroot"
export CXXFLAGS_x86_64_unknown_freebsd="--target=x86_64-unknown-freebsd${FREEBSD_TARGET_VERSION} --sysroot=/opt/freebsd-sysroot"
export CARGO_TARGET_X86_64_UNKNOWN_FREEBSD_RUSTFLAGS="-C link-arg=--target=x86_64-unknown-freebsd${FREEBSD_TARGET_VERSION} -C link-arg=--sysroot=/opt/freebsd-sysroot -C link-arg=-fuse-ld=lld"

log "cross-compiling $BINARY_NAME for x86_64-unknown-freebsd${FREEBSD_TARGET_VERSION}"
cd "$BUILD_SOURCE"
FREEBSD_RUST_TOOLCHAIN=$(/opt/rust-package-builder/scripts/ensure-rust-toolchain.sh "$BUILD_SOURCE" freebsd)
if [[ -f Cargo.lock ]]; then
    cargo "+$FREEBSD_RUST_TOOLCHAIN" build --release --locked --target x86_64-unknown-freebsd
else
    cargo "+$FREEBSD_RUST_TOOLCHAIN" build --release --target x86_64-unknown-freebsd
fi

BUILT="$CARGO_TARGET_DIR/x86_64-unknown-freebsd/release/$BINARY_NAME"
[[ -x "$BUILT" ]] || fatal "FreeBSD binary not found: $BUILT"
install -m 0555 "$BUILT" "$OUTPUT_BINARY"

desc=$(file -b "$OUTPUT_BINARY")
log "FreeBSD binary: $desc"
[[ "$desc" == *FreeBSD* ]] || fatal "cross-built ELF is not identified as FreeBSD"

header=$(llvm-readelf -h "$OUTPUT_BINARY")
printf '%s\n' "$header" | grep -qi FreeBSD || fatal "cross-built ELF header is not marked for FreeBSD"
dynamic=$(llvm-readelf -d "$OUTPUT_BINARY" || true)
if printf '%s\n' "$dynamic" | grep -q 'libc\.so\.6'; then
    fatal "Linux libc detected in FreeBSD target binary"
fi