#!/bin/sh
set -eu

previous_image=""
app_container_id=""

wait_for_health() {
  attempt=1
  while [ "$attempt" -le 40 ]; do
    status="$(docker inspect --format '{{if .State.Health}}{{.State.Health.Status}}{{else}}none{{end}}' "$app_container_id" 2>/dev/null || echo unknown)"
    [ "$status" = healthy ] && return 0
    [ "$status" = unhealthy ] && return 1
    sleep 3
    attempt=$((attempt + 1))
  done
  return 1
}

verify_routes() {
  docker exec -i "$app_container_id" node --input-type=module - <<'NODE'
const request = (path, init) => fetch(`http://127.0.0.1:3000${path}`, { signal: AbortSignal.timeout(20000), ...init });
for (const [path, text] of [["/", "Bereit für Ihre neue Website"], ["/kalender/", "Kalender"], ["/robots.txt", "Sitemap:"]]) {
  const response = await request(path);
  if (!response.ok || !(await response.text()).includes(text)) throw new Error(`${path} failed`);
}
const events = await request("/api/events");
const etag = events.headers.get("etag");
if (!events.ok || !etag || !Array.isArray(await events.json())) throw new Error("events failed");
if ((await request("/api/events", { headers: { "If-None-Match": etag } })).status !== 304) throw new Error("ETag failed");
for (const path of ["/health/live", "/health/ready"]) if (!(await request(path)).ok) throw new Error(`${path} failed`);
NODE
}

current_id="$(docker compose ps -q app 2>/dev/null || true)"
if [ -n "$current_id" ]; then previous_image="$(docker inspect --format '{{.Config.Image}}' "$current_id" 2>/dev/null || true)"; fi
if ! docker compose up -d --no-build --remove-orphans app; then exit 1; fi
app_container_id="$(docker compose ps -q app)"
if ! wait_for_health || ! verify_routes; then
  docker compose ps || true
  docker compose logs app || true
  if [ -n "$previous_image" ]; then APP_IMAGE_NAME="$previous_image" docker compose up -d --no-build --remove-orphans app; fi
  exit 1
fi