// cloudflare-dns's provisioner — the adapter making it a provider of the mesh `public-dns` interface
// (novox/hq ADR 0044). The reconcile loop and the contributions file 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// at the mesh's ingress, and remove it when the consumer is withdrawn (ADR 0048).
//
// The `public-dns` interface hands a consumer { fqdn, target, ttl } — a name that resolves publicly
// and what it resolves to. Like umami's analytics it is a *data* provision, not a credential one:
// nothing the mesh mints is set here (a DNS record is public, and the only secret is this module's
// own Cloudflare token, which never leaves). So the password the harness carries is unused; the name
// is derived from the login the mesh gave the consumer, which the consumer can derive too. Delivering
// the record back to the consumer is the data-provision return path ADR 0048 leaves out of scope.

import { runProvisioner, type Provision } 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(p: Provision): Promise<void> {
    const fqdn = cloudflare.nameFor(p.as);
    await cloudflare.upsert(fqdn);
    await announce("record.created", {
      name: fqdn,
      target: cloudflare.ingress,
      consumer: p.consumer ?? "",
    });
  },

  async remove(p: { as: string }): Promise<void> {
    const fqdn = cloudflare.nameFor(p.as);
    await cloudflare.remove(fqdn);
    await announce("record.removed", { name: fqdn, consumer: p.as });
  },
});

/** 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}`);
  }
}