import { test } from "node:test";
import assert from "node:assert/strict";

import {
  isMeshBuilt, pinnedInto, referenceFor, repositoryOf, stillUnpinned, type HeldImage,
} from "../src/pinning.ts";

/**
 * What a machine holds, and what it does not.
 *
 * The lab used to raise a registry inside the scenario and rewrite EVERY reference to it —
 * third-party ones included. That registry exists in no production mesh, so what these tests
 * describe now is the real division: our images are handed over and named by their own ID,
 * everything else is pulled from the internet and left exactly as written.
 */
const HELD: HeldImage[] = [
  {
    requested: "mesh-control:development",
    repository: "mesh-control",
    reference: "sha256:" + "a".repeat(64),
  },
  {
    requested: "mesh-runtime-postgres:development",
    repository: "mesh-runtime-postgres",
    reference: "sha256:" + "b".repeat(64),
  },
  {
    requested: "mesh-route-proxy:development",
    repository: "mesh-route-proxy",
    reference: "sha256:" + "c".repeat(64),
  },
];

test("the repository is the reference without its tag", () => {
  assert.equal(repositoryOf("mesh-runtime-postgres:development"), "mesh-runtime-postgres");
  assert.equal(repositoryOf("alpine"), "alpine");
  assert.equal(repositoryOf("gitea/gitea:1.22"), "gitea/gitea");
  assert.equal(repositoryOf("ghcr.io/mailu/admin@sha256:" + "d".repeat(64)), "ghcr.io/mailu/admin");
  // A port in a hostname is a colon that is NOT a tag, and treating it as one would truncate the
  // host rather than the tag.
  assert.equal(
    repositoryOf("registry.example:5000/novox/www:latest"), "registry.example:5000/novox/www");
});

/**
 * The line the whole change turns on.
 *
 * An image with somewhere to be fetched from is fetched from there. An image with nowhere — no
 * registry host, no upstream organisation, and a `mesh-` name — is one built here and handed over.
 */
test("only what is built here and published nowhere counts as ours", () => {
  for (const ours of [
    "mesh-control:development", "mesh-runtime-plex:development", "mesh-route-proxy:development",
    "mesh-provision-postgres@sha256:" + "0".repeat(64),
  ]) {
    assert.ok(isMeshBuilt(ours), `${ours} is one of ours and was not recognised`);
  }
  for (const theirs of [
    "postgres:17-alpine", "gitea/gitea:1.22", "ghcr.io/mailu/admin:1.9",
    "registry.example:5000/novox/www:latest",
    // A registry host in front of one of our names does NOT make it ours: it says somebody
    // published it, so the machine can fetch it from there like anything else.
    "registry.example:5000/mesh-control:development",
  ]) {
    assert.ok(!isMeshBuilt(theirs), `${theirs} is not ours and was claimed`);
  }
});

// The case this exists for: an image the mesh builds has no digest until it is built, so a
// manifest ships sixty-four zeros and would stop on the machine (novox/hq 04-ISSUES/025).
test("a placeholder for one of our own images becomes the image the machine holds", () => {
  const before = `"image": "mesh-runtime-postgres@sha256:${"0".repeat(64)}"`;
  const after = pinnedInto(before, HELD);
  assert.equal(after, `"image": "sha256:${"b".repeat(64)}"`);
  assert.deepEqual(stillUnpinned(after), []);
});

/**
 * **The heart of it.** A third-party reference is not touched.
 *
 * It used to be rewritten to whatever the lab's registry assigned, which meant the bed never once
 * fetched an image the way a real machine does — and every bootstrap fault that depended on that
 * went unfound.
 */
test("a third-party image is left exactly as the manifest wrote it", () => {
  for (const reference of [
    `postgres@sha256:${"7".repeat(64)}`,
    `gitea/gitea@sha256:${"8".repeat(64)}`,
    `ghcr.io/mailu/admin@sha256:${"9".repeat(64)}`,
    `registry.example:5000/novox/www:latest`,
  ]) {
    const before = `"image": "${reference}"`;
    assert.equal(pinnedInto(before, HELD), before, `${reference} was rewritten`);
  }
});

test("a reference of ours that already carries a registry is still redirected", () => {
  // What the committed substrate bundle looks like: written for a target that had a registry.
  const before = `"image": "192.0.2.250:5000/mesh-control@sha256:${"e".repeat(64)}"`;
  assert.equal(pinnedInto(before, HELD), `"image": "sha256:${"a".repeat(64)}"`);
});

// A longer repository ending in a shorter one must not be half-replaced.
test("a repository that ends in another one is not partly rewritten", () => {
  const before = `"image": "our-mesh-control@sha256:${"7".repeat(64)}"`;
  assert.equal(pinnedInto(before, HELD), before,
    "'our-mesh-control' was rewritten because it ends in 'mesh-control'");
});

test("every image in a whole manifest is settled at once", () => {
  const manifest = JSON.stringify({
    resources: [
      { id: "db", image: `postgres@sha256:${"1".repeat(64)}` },
      { id: "runtime", image: `mesh-runtime-postgres@sha256:${"0".repeat(64)}` },
      { id: "proxy", image: `mesh-route-proxy@sha256:${"0".repeat(64)}` },
      { id: "app", image: `gitea/gitea@sha256:${"2".repeat(64)}` },
    ],
  });
  const after = pinnedInto(manifest, HELD);
  assert.deepEqual(stillUnpinned(after), []);
  assert.ok(after.includes(`sha256:${"b".repeat(64)}`), after);
  assert.ok(after.includes(`sha256:${"c".repeat(64)}`), after);
  // And the two that are not ours are still whole, digest and all.
  assert.ok(after.includes(`postgres@sha256:${"1".repeat(64)}`), after);
  assert.ok(after.includes(`gitea/gitea@sha256:${"2".repeat(64)}`), after);
});

test("what a repository is held under can be asked for, and absence is not an empty string", () => {
  assert.equal(referenceFor(HELD, "mesh-control"), `sha256:${"a".repeat(64)}`);
  assert.equal(referenceFor(HELD, "mesh-runtime-plex"), undefined);
});

test("what is still a placeholder can be named", () => {
  const text = `"image": "something-of-ours@sha256:${"0".repeat(64)}"`;
  assert.deepEqual(stillUnpinned(text), ["something-of-ours"]);
});