// The s3-bucket provisioner's create, remove and holds, with what they touch handed in, so a unit test drives
// them with a fake admin client (the provisioner's index.ts runs them against minio).

import type { Provision } from "@novox/mesh-sdk/provisioner";
import { ensureLinkKey, revokeLinkKey, type LinkAdmin } from "../links.js";

export interface Admin extends LinkAdmin {
  bucketExists(bucket: string): Promise<boolean>;
  createBucket(bucket: string): Promise<void>;
  canReachAs(bucket: string, accessKey: string, secretKey: string): Promise<boolean>;
  readonly baseUrl: string;
}

export interface Deps {
  minio: Admin;
  linksDir: string;
  announce(type: string, body: unknown): Promise<void>;
}

export function handlers({ minio, linksDir, announce }: Deps) {
  return {

  async create(p: Provision): Promise<void> {
    const bucket = bucketNamed(p.derived);
    const accessKeyId = p.as;

    if (!(await minio.bucketExists(bucket))) await minio.createBucket(bucket);
    // Re-mint the scoped key idempotently: drop any prior one under this id, then add it back with
    // the mesh's secret.
    try { await minio.removeAccessKey(accessKeyId); } catch { /* none yet — first provision */ }
    await minio.createAccessKey(bucket, accessKeyId, p.password);
    await ensureLinkKey(minio, linksDir, bucket);

    await announce("bucket.created", {
      bucket,
      consumer: p.consumer ?? "",
      accessKey: accessKeyId,
      endpoint: minio.baseUrl,
    });
  },

  async remove(p: { as: string; derived: Readonly<Record<string, unknown>> }): Promise<void> {
    const bucket = bucketNamed(p.derived);

    // Revoking the key is what cuts the consumer's access, and the bucket is kept, empty or not
    // (novox/hq issue 241: a withdrawal never destroys a consumer's data — on 2026-10-04 a misread grants file withdrew every consumer at once). A bucket is removed by a person, never by this loop.
    try { await minio.removeAccessKey(p.as); } catch { /* already gone */ }
    await revokeLinkKey(minio, linksDir, bucket);
    console.error(`[minio] ${p.as} withdrawn: access key and link key revoked, bucket ${bucket} kept`);

    await announce("bucket.removed", { bucket, accessKey: 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 minio.canReachAs(bucketNamed(p.derived), p.as, p.password);
  },
  };
}

/** The bucket the mesh derived for this consumer.
 *
 *  Absent means this module is running against a control plane that does not fill `${consumer:…}`
 *  yet, or a manifest whose `serves` block lost the line. Both are the same mistake from here —
 *  nobody said which bucket — and both are said rather than guessed: a provisioner that fell back
 *  to deriving one would restore the second rule and hide the fault behind a bucket that happens
 *  to be right. */
function bucketNamed(derived: Readonly<Record<string, unknown>>): string {
  const bucket = derived.bucket;
  if (typeof bucket !== "string" || bucket === "") {
    throw new Error(
      "the mesh did not say which bucket this consumer gets: minio's manifest must serve " +
        "`bucket` under s3-bucket (novox/hq ADR 0202)",
    );
  }
  return bucket;
}