#!/bin/sh
# Assemble the exact URL layout documented in .gitea/README.md from committed
# Git revisions. Using git archive, rather than copying the working tree, keeps
# uncommitted experiments and ignored pack exports out of published images.
set -eu

repo_root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
cd "$repo_root"

dev_ref=${1:-HEAD}
packwiz_bin=${PACKWIZ_BIN:-packwiz}
build_root="$repo_root/.build"
site_root="$build_root/site"
work_root="$build_root/work"

if ! command -v "$packwiz_bin" >/dev/null 2>&1; then
  echo "Packwiz executable not found: $packwiz_bin" >&2
  exit 1
fi

rm -rf "$site_root" "$work_root"
mkdir -p "$site_root/forever/releases" "$work_root"

export_pack() {
  revision=$1
  pack=$2
  destination=$3
  scratch="$work_root/export"

  rm -rf "$scratch"
  mkdir -p "$scratch" "$(dirname -- "$destination")"

  if ! git cat-file -e "$revision:$pack/pack.toml" 2>/dev/null; then
    return 1
  fi

  git archive "$revision" "$pack" | tar -x -C "$scratch"
  mv "$scratch/$pack" "$destination"

  # Source packs intentionally omit internal hashes. Generate the distributable
  # index only in the ephemeral image-build tree, never in the Git checkout.
  (
    cd "$destination"
    "$packwiz_bin" refresh --build
  )
}

# main is always the development source, including when this script runs for a
# release-tag event whose checked-out commit is intentionally older than main.
export_pack "$dev_ref" forever "$site_root/forever/dev"

# Each forever-vX.Y.Z tag becomes an immutable URL. Version-aware Git sorting
# also identifies the newest release to copy to the stable channel.
release_tags=$(git tag --list 'forever-v*' --sort=-version:refname \
  | grep -E '^forever-v[0-9]+\.[0-9]+\.[0-9]+$' || true)

for tag in $release_tags; do
  version=${tag#forever-}
  export_pack "$tag" forever "$site_root/forever/releases/$version"
  echo "Published Forever release $version"
done

latest_tag=$(printf '%s\n' "$release_tags" | sed -n '/./{p;q;}')
if [ -n "$latest_tag" ]; then
  export_pack "$latest_tag" forever "$site_root/forever/stable"
  echo "Promoted ${latest_tag#forever-} to Forever stable"
else
  echo "No forever-vX.Y.Z tag exists; /forever/stable is not published yet" >&2
fi

rm -rf "$work_root"