import path from "node:path";
import { composeUp } from "./docker";
import { upsertEnvValues } from "./env-file";
import type { ResolvedPushSettings } from "./global-settings";
import { listBusinessStacks, stackDir } from "./stacks";

export interface PushRolloutResult {
  slug: string;
  ok: boolean;
  error?: string;
}

/**
 * Pushes the global VAPID key pair into every business's own `.env` (same
 * mechanism as email-rollout.ts's applyEmailSettingsToAllBusinesses — the
 * surgical, non-destructive `upsertEnvValues` helper, then a
 * force-recreate so the change actually takes effect). Unlike email's
 * reply-to, every one of these fields is always overwritten: VAPID
 * identity is platform-wide infrastructure, never a business preference
 * (a business has no legitimate reason to run its own key pair — see
 * global-settings.ts's own header).
 *
 * Deliberately does NOT write NEXT_PUBLIC_VAPID_PUBLIC_KEY — that
 * variable is retired (see src/app/api/push/vapid-public-key/route.ts in
 * the main app, which now serves the public key at runtime instead of it
 * being build-time-inlined). Recreating the container is still required
 * for the *server-side* VAPID_* vars to take effect, exactly like email.
 *
 * Runs sequentially, not in parallel, for the same reason
 * email-rollout.ts does — see that file's own header.
 */
export async function applyPushSettingsToAllBusinesses(settings: ResolvedPushSettings): Promise<PushRolloutResult[]> {
  const businesses = await listBusinessStacks();
  const results: PushRolloutResult[] = [];

  for (const business of businesses) {
    try {
      const dir = stackDir(business.slug);
      await upsertEnvValues(path.join(dir, ".env"), {
        PUSH_PROVIDER: "web-push",
        VAPID_PUBLIC_KEY: settings.publicKey,
        VAPID_PRIVATE_KEY: settings.privateKey,
        VAPID_SUBJECT: settings.subject,
      });
      await composeUp(dir, { forceRecreate: true });
      results.push({ slug: business.slug, ok: true });
    } catch (error) {
      results.push({ slug: business.slug, ok: false, error: error instanceof Error ? error.message : String(error) });
    }
  }

  return results;
}