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

if [ "$#" -ne 1 ]; then
  echo "usage: $0 OUTPUT_ENV_FILE" >&2
  exit 2
fi

output=$1
pcdir=/tangled/workspace/.pc
mkdir -p "$pcdir"

# Nixery installs only outputsToInstall (typically out/bin), not dev
# outputs. The dev outputs contain the .pc files that pkg-config needs.
# Generate minimal .pc files pointing at the shared objects that are present
# in the Nix store so Cargo can resolve Bevy's Linux system dependencies.
gen_pc() {
  local pc_name="$1" lib_name="${2:-$1}"
  local dir
  for dir in /nix/store/*/lib; do
    if [ -f "$dir/lib${lib_name}.so" ]; then
      printf 'Name: %s\nDescription: %s\nVersion: 1.0\nLibs: -L%s -l%s\n' \
        "$pc_name" "$pc_name" "$dir" "$lib_name" > "$pcdir/${pc_name}.pc"
      echo "generated ${pc_name}.pc -> $dir"
      return
    fi
  done
  echo "WARNING: lib${lib_name}.so not found in nix store" >&2
}

gen_pc wayland-client
gen_pc wayland-server
gen_pc wayland-cursor
gen_pc xkbcommon
gen_pc alsa asound
gen_pc libudev udev

pkg_config_path=$pcdir
for dir in /nix/store/*/lib/pkgconfig /nix/store/*/share/pkgconfig; do
  [ -d "$dir" ] && pkg_config_path="$pkg_config_path:$dir"
done

printf 'export PKG_CONFIG_PATH="%s"\n' "$pkg_config_path" > "$output"
echo "pkg-config setup complete"