// cloudflare-dns's provisioner — the adapter making it a provider of the mesh `public-dns` interface
// (novox/hq ADR 0049). The reconcile loop, sealing and grant-file handling are the sdk harness's;
// this writes only the per-registrar half: register a consumer's public name at Cloudflare, pointing
// it at the mesh's ingress, and remove it when the grant is withdrawn.
//
// The `public-dns` interface hands a consumer { fqdn, target, ttl } — a name that resolves publicly
// and what it resolves to. It is not a secret (a DNS record is public), so nothing is sealed beyond
// what the harness seals; the only secret is this module's own Cloudflare token, which never leaves.

import { runProvisioner, type Grant, type Credential } from "@novox/mesh-sdk/provisioner";
import { emit } from "@novox/mesh-sdk/events";
import { CloudflareClient } from "../client.js";

const cloudflare = CloudflareClient.fromEnv();

runProvisioner("public-dns", {
  async create(grant: Grant): Promise<Credential> {
    const fqdn = cloudflare.nameFor(grant.consumer);
    await cloudflare.upsert(fqdn);
    await announce("module.cloudflare-dns.record.created", {
      name: fqdn,
      target: cloudflare.ingress,
      consumer: grant.consumer,
      node: grant.node,
    });
    return { fields: { fqdn, target: cloudflare.ingress, ttl: "300" } };
  },

  async remove(grant: Grant): Promise<void> {
    const fqdn = cloudflare.nameFor(grant.consumer);
    await cloudflare.remove(fqdn);
    await announce("module.cloudflare-dns.record.removed", { name: fqdn, consumer: grant.consumer, node: grant.node });
  },
});

/** Emit best-effort: a broker hiccup must never fail or reverse a DNS change that already happened. */
async function announce(type: string, body: unknown): Promise<void> {
  try {
    await emit(type, body);
  } catch (err) {
    console.error(`[cloudflare-dns] could not emit ${type}: ${err}`);
  }
}