// mssql's provisioner — the adapter that makes mssql a provider of the mesh `mssql-database`
// interface. The reconcile loop, the contributions file, and reading the mesh's minted password
// are the sdk harness's; this writes only the per-service half: how mssql creates and removes a
// consumer's database + login/user with the mesh-minted credential (novox/hq ADR 0039/0040/0048).
//
// The `mssql-database` interface: a consumer connects to a database it alone owns, as `as` with
// the password the mesh minted.
//
// **The login name and password are the mesh's, not the provisioner's (ADR 0048).** The mesh
// derives the login and hands it to both ends, and mints the password. mssql creates a login, a
// same-named database, and a db_owner user under exactly that login — a name the consumer cannot
// learn is a database it cannot reach.
//
// The DDL runs through MssqlClient, which is the module's one pending boundary (see client.ts).

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

const mssql = MssqlClient.fromEnv();

/** Emit a lifecycle event without letting a broker hiccup fail the provisioning itself. */
async function announce(type: string, body: Record<string, string>): Promise<void> {
  try {
    await emit(type, body);
  } catch (err) {
    console.error(`[provisioner:mssql-database] emit ${type} failed: ${err}`);
  }
}

runProvisioner("mssql-database", {
  async create(p: Provision): Promise<void> {
    // Database, login and user share the consumer's name, so the consumer owns exactly its own.
    const database = p.as;
    await mssql.createDatabaseAndLogin(database, p.as, p.password);
    await announce("database.provisioned", {
      consumer: p.consumer ?? "",
      database,
      user: p.as,
    });
  },

  async remove(p: { as: string }): Promise<void> {
    await mssql.dropDatabaseAndLogin(p.as, p.as);
    await announce("database.deprovisioned", { database: p.as });
  },
  // Asked every minute by the harness: whether the backend still holds this consumer exactly as
  // the mesh gave it, so a login lost behind the provisioner's back is made again (novox/hq issue 120).
  async holds(p: Provision): Promise<boolean> {
    return mssql.holdsLogin(p.as, p.as, p.password);
  },
});