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

# [DEF:scripts.build_offline_docker_bundle:Module]
# @PURPOSE: Build and export an offline Docker bundle for enterprise-clean releases.
# [/DEF:scripts.build_offline_docker_bundle:Module]

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
DIST_ROOT="${PROJECT_ROOT}/dist/docker"

TAG="${1:-v1.0.0-rc2}"
POSTGRES_IMAGE="${POSTGRES_IMAGE:-postgres:16-alpine}"
BACKEND_IMAGE="ss-tools-backend:${TAG}"
FRONTEND_IMAGE="ss-tools-frontend:${TAG}"

mkdir -p "${DIST_ROOT}"

cd "${PROJECT_ROOT}"

echo "[offline-bundle] building backend image ${BACKEND_IMAGE}"
docker build -f docker/backend.Dockerfile -t "${BACKEND_IMAGE}" .

echo "[offline-bundle] building frontend image ${FRONTEND_IMAGE}"
docker build -f docker/frontend.Dockerfile -t "${FRONTEND_IMAGE}" .

echo "[offline-bundle] pulling postgres image ${POSTGRES_IMAGE}"
docker pull "${POSTGRES_IMAGE}"

echo "[offline-bundle] exporting tar archives"
docker save -o "${DIST_ROOT}/backend.${TAG}.tar" "${BACKEND_IMAGE}"
docker save -o "${DIST_ROOT}/frontend.${TAG}.tar" "${FRONTEND_IMAGE}"
docker save -o "${DIST_ROOT}/postgres.${TAG}.tar" "${POSTGRES_IMAGE}"

echo "[offline-bundle] calculating checksums"
(
  cd "${DIST_ROOT}"
  sha256sum "backend.${TAG}.tar" "frontend.${TAG}.tar" "postgres.${TAG}.tar" > "sha256sums.${TAG}.txt"
)

cat > "${DIST_ROOT}/manifest.${TAG}.txt" <<EOF
release_tag=${TAG}
backend_image=${BACKEND_IMAGE}
frontend_image=${FRONTEND_IMAGE}
postgres_image=${POSTGRES_IMAGE}
compose_file=docker-compose.enterprise-clean.yml
env_template=.env.enterprise-clean.example
generated_at_utc=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
EOF

cp "${PROJECT_ROOT}/docker-compose.enterprise-clean.yml" "${DIST_ROOT}/docker-compose.enterprise-clean.yml"
cp "${PROJECT_ROOT}/.env.enterprise-clean.example" "${DIST_ROOT}/.env.enterprise-clean.example"

echo "[offline-bundle] bundle created in ${DIST_ROOT}"
echo "[offline-bundle] next step:"
echo "  docker load -i ${DIST_ROOT}/backend.${TAG}.tar"
echo "  docker load -i ${DIST_ROOT}/frontend.${TAG}.tar"
echo "  docker load -i ${DIST_ROOT}/postgres.${TAG}.tar"