import test from 'node:test';
import assert from 'node:assert/strict';
import {
  assertLoadedTrustedSignerSnapshot,
  TrustedSignerSnapshotLoader,
  type TrustedSignerSnapshotTransport,
} from './trusted-signer-snapshot.js';
import { resolveTrustedManifestSigner } from './trusted-signer-registry.js';

const COMMIT = 'a'.repeat(40);
const ANCHOR_URL = 'https://guanghulab.com/api/ai/v1/anchor';
const REGISTRY_PATH = 'routing/trusted-domain-manifest-signers.json';
const registryUrl = (commit: string) =>
  `https://guanghulab.com/code/bingshuo/guanghu-ice-heart/raw/commit/${commit}/${REGISTRY_PATH}`;

function anchor(commit = COMMIT, overrides: Record<string, unknown> = {}) {
  return {
    schema: 'guanghu.public-navigation-anchor/v1',
    anchor_id: 'GLW-PUBLIC-NAV-ANCHOR-001',
    state: 'CURRENT_CANONICAL',
    repository_id: 'REPO-012',
    branch: 'main',
    public_entry: ANCHOR_URL,
    code_entry: 'https://guanghulab.com/code/bingshuo/guanghu-ice-heart',
    maps: {
      trusted_domain_manifest_signers: {
        path: REGISTRY_PATH,
        id: 'GH-AIOS-TRUSTED-DOMAIN-MANIFEST-SIGNERS-001',
        version: '1.0.0',
      },
    },
    navigation_source: {
      anchor_id: 'GLW-PUBLIC-NAV-ANCHOR-001',
      source_commit: commit,
      source_mode: 'REPO-012_MAIN_GIT_SNAPSHOT',
      source_degraded: false,
    },
    ...overrides,
  };
}

function registry() {
  return {
    schema: 'gh-aios.trusted-domain-manifest-signers/v1',
    registryId: 'GH-AIOS-TRUSTED-DOMAIN-MANIFEST-SIGNERS-001',
    version: '1.0.0',
    state: 'CURRENT',
    signers: [],
  };
}

function transport(responses: Map<string, unknown>): TrustedSignerSnapshotTransport & { calls: string[] } {
  const calls: string[] = [];
  return {
    calls,
    async fetchJson(url) {
      calls.push(url);
      if (!responses.has(url)) throw new Error('unexpected_url');
      const response = responses.get(url);
      if (response instanceof Error) throw response;
      return response;
    },
  };
}

test('loads the anchor and signer registry from one exact REPO-012 commit', async () => {
  const source = transport(new Map<string, unknown>([
    [ANCHOR_URL, anchor()],
    [registryUrl(COMMIT), registry()],
  ]));
  const loader = new TrustedSignerSnapshotLoader(source);

  const result = await loader.refresh();

  assert.deepEqual(source.calls, [ANCHOR_URL, registryUrl(COMMIT)]);
  assert.equal(result.receipt.status, 'CURRENT');
  assert.equal(result.receipt.sourceCommit, COMMIT);
  assert.equal(result.receipt.registryVersion, '1.0.0');
  assert.equal(result.receipt.signerCount, 0);
  assert.ok(result.registry);
  assert.equal(result.registry.source.sourceCommit, COMMIT);
  assert.equal(assertLoadedTrustedSignerSnapshot(result), result);
  assert.throws(() => assertLoadedTrustedSignerSnapshot({ ...result }), /trusted_signer_snapshot_unregistered/);
  assert.equal(resolveTrustedManifestSigner(result.registry, {
    domainId: 'DOM-FIFTH-0001',
    repositoryId: 'REPO-014',
    signerId: 'GH-LIGHTHOUSE-001',
  }), null);
});

test('a degraded anchor fails closed before any registry URL is fetched', async () => {
  const source = transport(new Map<string, unknown>([
    [ANCHOR_URL, anchor(COMMIT, {
      navigation_source: {
        anchor_id: 'GLW-PUBLIC-NAV-ANCHOR-001',
        source_commit: COMMIT,
        source_mode: 'REPO-012_MAIN_GIT_SNAPSHOT',
        source_degraded: true,
      },
    })],
  ]));
  const loader = new TrustedSignerSnapshotLoader(source);

  const result = await loader.refresh();

  assert.deepEqual(source.calls, [ANCHOR_URL]);
  assert.equal(result.registry, null);
  assert.deepEqual(result.receipt, {
    status: 'UNAVAILABLE',
    reason: 'ANCHOR_INVALID',
    sourceCommit: null,
    registryVersion: null,
    signerCount: 0,
  });
});

test('an invalid later update retains only the in-memory last-known-good snapshot', async () => {
  let currentAnchor: unknown = anchor();
  let currentRegistry: unknown = registry();
  const source: TrustedSignerSnapshotTransport = {
    async fetchJson(url) {
      if (url === ANCHOR_URL) return currentAnchor;
      if (url === registryUrl(COMMIT)) return currentRegistry;
      throw new Error('unexpected_url');
    },
  };
  const loader = new TrustedSignerSnapshotLoader(source);
  const first = await loader.refresh();
  assert.equal(first.receipt.status, 'CURRENT');

  currentRegistry = { ...registry(), version: 'not-semver' };
  const degraded = await loader.refresh();

  assert.equal(degraded.registry, first.registry);
  assert.deepEqual(degraded.receipt, {
    status: 'DEGRADED_LAST_KNOWN_GOOD',
    reason: 'REGISTRY_INVALID',
    sourceCommit: COMMIT,
    registryVersion: '1.0.0',
    signerCount: 0,
  });

  currentAnchor = anchor('b'.repeat(40));
  const transportFailure = await loader.refresh();
  assert.equal(transportFailure.registry, first.registry);
  assert.equal(transportFailure.receipt.status, 'DEGRADED_LAST_KNOWN_GOOD');
  assert.equal(transportFailure.receipt.reason, 'SOURCE_UNAVAILABLE');
  assert.equal(transportFailure.receipt.sourceCommit, COMMIT);
});

test('concurrent callers share one refresh and receive no raw error details', async () => {
  let releaseAnchor!: () => void;
  const anchorGate = new Promise<void>(resolve => { releaseAnchor = resolve; });
  const source = transport(new Map<string, unknown>([
    [ANCHOR_URL, anchor()],
    [registryUrl(COMMIT), registry()],
  ]));
  const originalFetch = source.fetchJson.bind(source);
  source.fetchJson = async url => {
    if (url === ANCHOR_URL) await anchorGate;
    return originalFetch(url);
  };
  const loader = new TrustedSignerSnapshotLoader(source);

  const first = loader.refresh();
  const second = loader.refresh();
  releaseAnchor();
  assert.equal(await first, await second);
  assert.deepEqual(source.calls, [ANCHOR_URL, registryUrl(COMMIT)]);

  const failing = new TrustedSignerSnapshotLoader({
    async fetchJson() {
      throw new Error('secret transport detail');
    },
  });
  const result = await failing.refresh();
  assert.equal(JSON.stringify(result), JSON.stringify({
    registry: null,
    receipt: {
      status: 'UNAVAILABLE',
      reason: 'SOURCE_UNAVAILABLE',
      sourceCommit: null,
      registryVersion: null,
      signerCount: 0,
    },
  }));
});