import test from 'node:test';
import assert from 'node:assert/strict';
import { createHash, generateKeyPairSync, sign } from 'node:crypto';
import {
  createNodePossessionChallenge,
  nodePossessionChallengeSigningBytes,
  verifyNodePossessionResponse,
} from './node-possession-proof.js';
import {
  nodeRegistrationClaimSigningBytes,
  parseNodeRegistrationEndpointRegistry,
  resolveNodeRegistrationEndpoint,
  verifyNodeRegistrationClaim,
} from './node-registration.js';

const NOW = 1_786_291_200_000;
const DOMAIN_ID = 'DOM-FIFTH-0001';
const NODE_ID = 'LOCAL-001';
const registrationKeys = generateKeyPairSync('ed25519');
const nodeKeys = generateKeyPairSync('ed25519');
const nodePublicKeyPem = nodeKeys.publicKey.export({ format: 'pem', type: 'spki' }).toString();
const fingerprint = createHash('sha256')
  .update(nodeKeys.publicKey.export({ format: 'der', type: 'spki' }))
  .digest('hex');

function verifiedRegistration() {
  const registry = parseNodeRegistrationEndpointRegistry({
    endpoints: [{
      algorithm: 'Ed25519',
      domainIds: [DOMAIN_ID],
      endpointId: 'GH-NODE-REG-001',
      nodeTypes: ['local-terminal'],
      publicKeyPem: registrationKeys.publicKey.export({ format: 'pem', type: 'spki' }).toString(),
      signerId: 'GH-NODE-REG-SIGNER-001',
      status: 'ACTIVE',
      url: 'https://guanghulab.com/api/ai/v1/node-registrations/claims',
    }],
    registryId: 'GH-AIOS-NODE-REGISTRATION-ENDPOINTS-001',
    schema: 'gh-aios.node-registration-endpoints/v1',
    state: 'CURRENT',
    version: '1.0.0',
  }, {
    repositoryId: 'REPO-012',
    sourceCommit: 'a'.repeat(40),
    sourceUrl: `https://guanghulab.com/code/bingshuo/guanghu-ice-heart/raw/commit/${'a'.repeat(40)}/routing/node-registration-endpoints.json`,
  });
  const endpoint = resolveNodeRegistrationEndpoint(registry, {
    domainId: DOMAIN_ID,
    nodeType: 'local-terminal',
  });
  assert.ok(endpoint);
  const payload = {
    accountId: 'bingshuo',
    claimId: 'NODE-CLAIM-001',
    domainId: DOMAIN_ID,
    endpointId: endpoint.endpointId,
    expiresAt: NOW + 120_000,
    issuedAt: NOW - 1_000,
    nodeId: NODE_ID,
    nodeKeyFingerprint: fingerprint,
    nodeType: 'local-terminal' as const,
    schema: 'gh-aios.node-registration-claim/v1' as const,
    signerId: endpoint.signerId,
  };
  return verifyNodeRegistrationClaim({
    ...payload,
    signature: sign(null, nodeRegistrationClaimSigningBytes(payload), registrationKeys.privateKey).toString('base64'),
  }, {
    accountId: payload.accountId,
    domainId: DOMAIN_ID,
    nodeId: NODE_ID,
    nodeType: 'local-terminal',
  }, endpoint, NOW);
}

function responseFor(challenge: ReturnType<typeof createNodePossessionChallenge>) {
  return {
    challengeId: challenge.challengeId,
    publicKeyPem: nodePublicKeyPem,
    schema: 'gh-aios.node-possession-response/v1',
    signature: sign(null, nodePossessionChallengeSigningBytes(challenge), nodeKeys.privateKey).toString('base64'),
  };
}

test('verifies a fresh proof from the key fingerprint bound into the signed registration', () => {
  const registration = verifiedRegistration();
  const challenge = createNodePossessionChallenge(
    registration,
    NOW,
    'NODE-CHALLENGE-001',
    'A'.repeat(43),
  );
  const response = responseFor(challenge);
  assert.equal(verifyNodePossessionResponse(response, challenge, registration, NOW + 1), true);
  assert.throws(() => verifyNodePossessionResponse(response, challenge, registration, NOW + 2), /proof_invalid/);
});

test('rejects a forged challenge that was not issued by the verifier', () => {
  const registration = verifiedRegistration();
  const challenge = {
    ...createNodePossessionChallenge(registration, NOW, 'NODE-CHALLENGE-001', 'A'.repeat(43)),
    nonce: 'B'.repeat(43),
  };
  assert.throws(() => verifyNodePossessionResponse(responseFor(challenge), challenge, registration, NOW + 1), /proof_invalid/);
});

test('rejects a response signed by a different node key', () => {
  const registration = verifiedRegistration();
  const challenge = createNodePossessionChallenge(registration, NOW, 'NODE-CHALLENGE-001', 'A'.repeat(43));
  const otherKeys = generateKeyPairSync('ed25519');
  const response = {
    challengeId: challenge.challengeId,
    publicKeyPem: otherKeys.publicKey.export({ format: 'pem', type: 'spki' }).toString(),
    schema: 'gh-aios.node-possession-response/v1',
    signature: sign(null, nodePossessionChallengeSigningBytes(challenge), otherKeys.privateKey).toString('base64'),
  };
  assert.throws(() => verifyNodePossessionResponse(response, challenge, registration, NOW + 1), /proof_invalid/);
});

test('rejects expired, replayed-to-another-challenge and unknown-field responses', () => {
  const registration = verifiedRegistration();
  const first = createNodePossessionChallenge(registration, NOW, 'NODE-CHALLENGE-001', 'A'.repeat(43));
  const second = createNodePossessionChallenge(registration, NOW, 'NODE-CHALLENGE-002', 'B'.repeat(43));
  assert.throws(() => verifyNodePossessionResponse(responseFor(first), second, registration, NOW + 1), /proof_invalid/);
  assert.throws(() => verifyNodePossessionResponse({ ...responseFor(first), extra: true }, first, registration, NOW + 1), /proof_invalid/);
  assert.throws(() => verifyNodePossessionResponse(responseFor(first), first, registration, NOW + 60_000), /proof_invalid/);
});

test('does not accept a structurally copied registration as verified provenance', () => {
  const copied = { ...verifiedRegistration() };
  assert.throws(() => createNodePossessionChallenge(copied, NOW, 'NODE-CHALLENGE-001', 'A'.repeat(43)), /proof_invalid/);
});