#!/usr/bin/env bash
set -euo pipefail
export DOCKER_BUILDKIT=1

repository_root=$(cd "$(dirname "$0")/.." && pwd)
output_directory="${THT_THT_OUTPUT_DIRECTORY:-$repository_root/dist/tht}"
build_commit=$(git -C "$repository_root" rev-parse HEAD)
build_time=$(git -C "$repository_root" show -s --format=%cI HEAD)
if ! build_version=$(git -C "$repository_root" describe --tags --exact-match HEAD 2>/dev/null); then
  build_version=0.0.0-dev
fi

usage() {
  cat <<'EOF'
Usage: bash scripts/build-tht.sh [--all] [--output ABSOLUTE_DIRECTORY]

Build every supported native tht binary with the repository-pinned Docker builder.
EOF
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --all)
      ;;
    --output)
      [[ $# -ge 2 ]] || { echo "--output requires an absolute directory" >&2; exit 2; }
      output_directory=$2
      shift
      ;;
    --help|-h)
      usage
      exit 0
      ;;
    *)
      echo "unknown argument: $1" >&2
      usage >&2
      exit 2
      ;;
  esac
  shift
done

if [[ "$output_directory" != /* || "$output_directory" == / || "$output_directory" == */ ||
      "$output_directory" == *//* || "/$output_directory/" == */../* ||
      "/$output_directory/" == */./* ]]; then
  echo "THT_THT_OUTPUT_DIRECTORY must be an absolute canonical path" >&2
  exit 2
fi

mkdir -p "$output_directory"
docker build \
  --build-arg "THT_VERSION=$build_version" \
  --build-arg "THT_COMMIT=$build_commit" \
  --build-arg "THT_BUILD_TIME=$build_time" \
  --file "$repository_root/docker/tht.Dockerfile" \
  --output "type=local,dest=$output_directory" \
  "$repository_root"