#!/bin/sh
set -eu

# The runner's Docker volume survives individual checkouts.  It contains a
# copy of the Git originals, optimized variants, and the hash manifests used
# by optimize-images.mjs.
cache_namespace=$(printf '%s' "${IMAGE_CACHE_NAMESPACE:-shared}" | tr -c 'A-Za-z0-9_.-' '-')
case "$cache_namespace" in
  ''|*[!A-Za-z0-9_.-]*)
    echo "IMAGE_CACHE_NAMESPACE may only contain letters, digits, ., _ and -" >&2
    exit 1
    ;;
esac

cache_volume="website-starter-image-cache-${cache_namespace}"
docker volume create "$cache_volume" >/dev/null

app_dir="$(pwd)"

run_image_prune() {
  docker run --rm "$@" \
    --mount "type=volume,src=$cache_volume,dst=/image-cache" \
    --workdir "$app_dir" \
    --env IMAGE_CACHE_ROOT=/image-cache \
    --env HOST_UID="$(id -u)" \
    --env HOST_GID="$(id -g)" \
    node:24-slim \
    sh -ec '
    npm run images:prune
    chown -R "$HOST_UID:$HOST_GID" /image-cache "$PWD/public/images/content" "$PWD/public/images/slider" "$PWD/public/images/secondary-slider" "$PWD/public/images/backgrounds"
  '
}

# In Gitea Actions, the Docker daemon cannot bind-mount the job container's
# workspace path. Share its existing workspace volume instead.
if docker inspect "$(hostname)" >/dev/null 2>&1; then
  run_image_prune --volumes-from "$(hostname)"
else
  run_image_prune --mount "type=bind,src=$app_dir,dst=$app_dir"
fi