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

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export PATH

log() {
  printf '%s\n' "$*" >&2
}

die() {
  log "pi-web Docker dev dependencies: $*"
  exit 1
}

workspace_dir=${PI_WEB_DEV_WORKSPACE_DIR:-/workspace}
seed_dir=${PI_WEB_DEV_DEPENDENCY_SEED_DIR:-/opt/pi-web-dev-dependencies}
target_dir=$workspace_dir/node_modules
generation_file=$seed_dir/generation
marker_file=$target_dir/.pi-web-dev-dependency-generation

# A direct Compose invocation may skip the image rebuild. Fail closed rather
# than copying dependencies for different checkout manifests.
for manifest in package.json package-lock.json; do
  source_manifest=$workspace_dir/$manifest
  image_manifest=$seed_dir/$manifest
  [ -f "$source_manifest" ] || die "checkout is missing $source_manifest"
  [ -f "$image_manifest" ] || die "development image is missing $image_manifest"
  if ! cmp -s "$source_manifest" "$image_manifest"; then
    die "development image dependencies do not match the checkout; run ./docker/pi-web-docker --dev start or update to rebuild the image"
  fi
done

[ -d "$seed_dir/node_modules" ] || die "development image is missing the dependency seed at $seed_dir/node_modules"
[ -s "$generation_file" ] || die "development image is missing its dependency generation at $generation_file"
[ ! -L "$target_dir" ] || die "refusing to synchronize through the node_modules symlink at $target_dir"
mkdir -p "$target_dir"

expected_generation=$(cat "$generation_file")
current_generation=
if [ -f "$marker_file" ]; then
  current_generation=$(cat "$marker_file")
fi

if [ "$current_generation" = "$expected_generation" ]; then
  log "PI WEB Docker dev dependencies are current."
  exit 0
fi

log "Synchronizing PI WEB Docker dev dependencies from the rebuilt image ..."
# Write the marker only after a complete copy so a failed init retries next time.
find "$target_dir" -mindepth 1 -maxdepth 1 -exec rm -rf -- {} +
cp -a "$seed_dir/node_modules/." "$target_dir/"
printf '%s\n' "$expected_generation" >"$marker_file"
chmod 0666 "$marker_file"
log "PI WEB Docker dev dependencies synchronized."