#!/usr/bin/env bash
# Build and optionally push the banger golden image.
#
# Examples:
#   ./scripts/publish-golden-image.sh --tag thaloco/banger-golden:debian-bookworm
#   ./scripts/publish-golden-image.sh --tag thaloco/banger-golden:debian-bookworm --push
#   ./scripts/publish-golden-image.sh --tag ghcr.io/thaloco/banger-golden:latest --push --platform linux/amd64
#
# The script expects the user to be logged in to the target registry
# (docker login / gh auth token) when --push is set.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
DOCKERFILE="$REPO_ROOT/images/golden/Dockerfile"
CONTEXT="$REPO_ROOT/images/golden"

TAG=""
PUSH=0
PLATFORM="linux/amd64"
EXTRA_TAGS=()

usage() {
  cat <<'EOF'
Usage: publish-golden-image.sh --tag <reg/name:tag> [--tag <alt>] [--push] [--platform <platform>]

Options:
  --tag        Primary image reference (required). Repeat --tag for extra tags
               (e.g. to publish both :latest and :debian-bookworm).
  --push       Push all tags after building. Requires prior `docker login`.
  --platform   Build platform (default: linux/amd64). banger x86_64-only today.
  -h, --help   This help.
EOF
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --tag)
      if [[ -z "$TAG" ]]; then
        TAG="${2:-}"
      else
        EXTRA_TAGS+=("${2:-}")
      fi
      shift 2
      ;;
    --push)
      PUSH=1
      shift
      ;;
    --platform)
      PLATFORM="${2:-}"
      shift 2
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      echo "unknown option: $1" >&2
      usage >&2
      exit 1
      ;;
  esac
done

if [[ -z "$TAG" ]]; then
  echo "--tag is required" >&2
  usage >&2
  exit 1
fi

if ! command -v docker >/dev/null 2>&1; then
  echo "docker binary not found in PATH" >&2
  exit 1
fi

BUILD_ARGS=(build --platform "$PLATFORM" -t "$TAG" -f "$DOCKERFILE")
for t in "${EXTRA_TAGS[@]}"; do
  BUILD_ARGS+=(-t "$t")
done
BUILD_ARGS+=("$CONTEXT")

echo "==> building $TAG (platform=$PLATFORM)"
docker "${BUILD_ARGS[@]}"

if [[ "$PUSH" -eq 1 ]]; then
  echo "==> pushing $TAG"
  docker push "$TAG"
  for t in "${EXTRA_TAGS[@]}"; do
    echo "==> pushing $t"
    docker push "$t"
  done
fi

echo "==> done"
echo "  primary tag: $TAG"
for t in "${EXTRA_TAGS[@]}"; do
  echo "  extra tag  : $t"
done
if [[ "$PUSH" -eq 0 ]]; then
  echo
  echo "Image is built locally but not pushed. Pass --push to publish."
fi