#!/usr/bin/env bash
# Initialize wireguard-android submodule (third-party/wireguard-android in .gitmodules).
set -euo pipefail
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$ROOT"

SUB_PATH="third-party/wireguard-android"
SUB_NAME="third-party/wireguard-android"

if ! grep -q "$SUB_PATH" .gitmodules 2>/dev/null; then
  echo "error: .gitmodules missing $SUB_PATH" >&2
  exit 1
fi

# .gitmodules without a gitlink in the tree breaks plain `git submodule update`.
if ! git cat-file -e "HEAD:$SUB_PATH" 2>/dev/null \
   && ! git ls-files --stage "$SUB_PATH" | grep -q '^160000'; then
  url="$(git config -f .gitmodules --get "submodule.$SUB_NAME.url" || true)"
  if [ -z "$url" ]; then
    echo "error: no url for submodule.$SUB_NAME in .gitmodules" >&2
    exit 1
  fi
  sha="$(git ls-remote "$url" HEAD | awk 'NR==1 {print $1}')"
  if [ -z "$sha" ]; then
    echo "error: could not resolve HEAD for $url" >&2
    exit 1
  fi
  echo "registering missing gitlink for $SUB_PATH at $sha"
  git update-index --add --cacheinfo 160000,"$sha","$SUB_PATH"
  echo "warning: gitlink was missing from the tree — commit third-party/wireguard-android after init" >&2
fi

git submodule sync "$SUB_PATH"
git submodule update --init --recursive "$SUB_PATH"
echo "wireguard-android ready under $SUB_PATH"
echo "Gradle includes :tunnel when $SUB_PATH/tunnel exists."