#!/bin/bash
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SOURCE_DIR="${1:?usage: apply-patches.sh /path/to/RustProxy-source}"

[[ -f "$SOURCE_DIR/Cargo.toml" ]] || {
    echo "Missing Cargo.toml in RustProxy source: $SOURCE_DIR" >&2
    exit 1
}

command -v git >/dev/null 2>&1 || { echo "git is required to apply FreeBSD patches" >&2; exit 1; }
command -v python3 >/dev/null 2>&1 || { echo "python3 is required to detect RustProxy version" >&2; exit 1; }

version="$(python3 - "$SOURCE_DIR/Cargo.toml" <<'PY'
import sys
import tomllib
from pathlib import Path
with Path(sys.argv[1]).open('rb') as f:
    data = tomllib.load(f)
print(data['package']['version'])
PY
)"

PATCH_DIR="$ROOT/patches/$version"
if [[ ! -d "$PATCH_DIR" ]]; then
    echo "No FreeBSD/OPNsense patch set for RustProxy $version; building upstream source unchanged."
    exit 0
fi

shopt -s nullglob
patches=("$PATCH_DIR"/*.patch)
if (( ${#patches[@]} == 0 )); then
    echo "FreeBSD patch directory is empty for RustProxy $version: $PATCH_DIR" >&2
    exit 1
fi

echo "Applying FreeBSD/OPNsense patch set for RustProxy $version to isolated build source..."
for patch_file in "${patches[@]}"; do
    patch_name="$(basename "$patch_file")"
    if git -C "$SOURCE_DIR" apply --check "$patch_file" 2>/dev/null; then
        git -C "$SOURCE_DIR" apply "$patch_file"
        echo "  applied: $patch_name"
    elif git -C "$SOURCE_DIR" apply --reverse --check "$patch_file" 2>/dev/null; then
        echo "  already present: $patch_name"
    else
        echo "Patch does not apply cleanly: $patch_name" >&2
        echo "RustProxy source version: $version" >&2
        exit 1
    fi
done