import assert from 'node:assert/strict';
import { createHmac, generateKeyPairSync } from 'node:crypto';
import { createServer } from 'node:http';
import test from 'node:test';

const DIST_ROOT = new URL('../dist/src/', import.meta.url);

async function importFresh(relativePath) {
  return import(new URL(`${relativePath}?t=${Date.now()}-${Math.random()}`, DIST_ROOT).href);
}

function setEnv(updates) {
  const previous = new Map();
  for (const [key, value] of Object.entries(updates)) {
    previous.set(key, process.env[key]);
    if (value === undefined || value === null) delete process.env[key];
    else process.env[key] = value;
  }
  return () => {
    for (const [key, value] of previous.entries()) {
      if (value === undefined) delete process.env[key];
      else process.env[key] = value;
    }
  };
}

test('GitHub Agent help exposes routing actions', async () => {
  const { executeGitHubAgentAction } = await importFresh('./runtime.js');

  const help = await executeGitHubAgentAction({ action: 'agent.help' });
  assert.equal(help.ok, true);
  assert.ok(help.actions.includes('sin.github.app.routing.status'));
  assert.ok(help.actions.includes('sin.github.webhook.route'));
  assert.ok(help.actions.includes('sin.github.issue.comment.as_app'));
});

test('routeGitHubWebhook prefers installation.app_id over shared central path', async () => {
  const restoreEnv = setEnv({
    SIN_GITHUB_APP_ROUTING_JSON: JSON.stringify({
      mode: 'central-endpoint-routing',
      defaultWebhookPath: '/api/webhooks/github-apps',
      apps: [
        {
          appIdEnv: 'SIN_HERMES_GITHUB_APP_ID',
          appSlug: 'sin-hermes',
          preferredAgentSlug: 'sin-hermesbote',
          botName: 'SIN-Hermes[bot]',
          webhookPath: '/api/webhooks/github-apps',
          webhookSecretEnv: 'SIN_HERMES_GITHUB_APP_WEBHOOK_SECRET',
        },
        {
          appIdEnv: 'SIN_BUGBOUNTY_GITHUB_APP_ID',
          appSlug: 'sin-bugbounty',
          preferredAgentSlug: 'sin-bugbounty',
          botName: 'SIN-BugBounty[bot]',
          webhookPath: '/api/webhooks/github-apps',
          webhookSecretEnv: 'SIN_BUGBOUNTY_GITHUB_APP_WEBHOOK_SECRET',
        },
      ],
    }),
    SIN_HERMES_GITHUB_APP_ID: '123456',
    SIN_HERMES_GITHUB_APP_WEBHOOK_SECRET: 'secret-1',
    SIN_BUGBOUNTY_GITHUB_APP_ID: '345678',
    SIN_BUGBOUNTY_GITHUB_APP_WEBHOOK_SECRET: 'secret-3',
  });

  try {
    const { routeGitHubWebhook } = await importFresh('./github-app-routing.js');
    const rawBody = JSON.stringify({
      action: 'opened',
      installation: { id: 987654321, app_id: 345678 },
      repository: { full_name: 'OpenSIN-AI/OpenSIN-backend' },
    });
    const signature256 = `sha256=${createHmac('sha256', 'secret-3').update(rawBody).digest('hex')}`;
    const result = await routeGitHubWebhook({
      rawBody,
      routePath: '/api/webhooks/github-apps',
      signature256,
      eventName: 'pull_request',
      deliveryId: 'delivery-central-test',
    });
    assert.equal(result.ok, true);
    assert.equal(result.route.agentSlug, 'sin-bugbounty');
    assert.equal(result.route.botName, 'SIN-BugBounty[bot]');
  } finally {
    restoreEnv();
  }
});

test('commentIssueAsGitHubApp exchanges installation token and posts comment', async () => {
  const { privateKey } = generateKeyPairSync('rsa', {
    modulusLength: 2048,
    privateKeyEncoding: { type: 'pkcs1', format: 'pem' },
    publicKeyEncoding: { type: 'pkcs1', format: 'pem' },
  });

  let commentRequestBody = '';
  const server = createServer((req, res) => {
    if (req.method === 'POST' && req.url === '/app/installations/987654321/access_tokens') {
      res.writeHead(200, { 'content-type': 'application/json' });
      res.end(JSON.stringify({ token: 'installation-token-1', expires_at: '2030-01-01T00:00:00Z' }));
      return;
    }
    if (req.method === 'POST' && req.url === '/repos/OpenSIN-AI/OpenSIN-backend/issues/42/comments') {
      const chunks = [];
      req.on('data', (chunk) => chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk)));
      req.on('end', () => {
        commentRequestBody = Buffer.concat(chunks).toString('utf8');
        res.writeHead(200, { 'content-type': 'application/json' });
        res.end(JSON.stringify({ id: 9001, html_url: 'https://github.com/OpenSIN-AI/OpenSIN-backend/issues/42#issuecomment-9001' }));
      });
      return;
    }
    res.writeHead(404, { 'content-type': 'application/json' });
    res.end(JSON.stringify({ error: 'not_found' }));
  });

  await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
  const address = server.address();
  const port = typeof address === 'object' && address ? address.port : 0;
  const restoreEnv = setEnv({
    SIN_GITHUB_API_BASE_URL: `http://127.0.0.1:${port}`,
    SIN_GITHUB_APP_ROUTING_JSON: JSON.stringify({
      defaultMode: 'hybrid',
      defaultWebhookPath: '/github/webhook',
      apps: [
        {
          agentSlug: 'sin-hermesbote',
          appSlug: 'sin-hermes',
          botName: 'SIN-Hermes[bot]',
          appId: 123456,
          privateKeyPem: privateKey,
          webhookSecret: 'secret-1',
        },
      ],
    }),
  });

  try {
    const { commentIssueAsGitHubApp } = await importFresh('./github-app-routing.js');
    const result = await commentIssueAsGitHubApp({
      repo: 'OpenSIN-AI/OpenSIN-backend',
      issueNumber: 42,
      body: 'Hello from SIN-Hermes[bot]',
      agentSlug: 'sin-hermesbote',
      installationId: 987654321,
    });
    assert.equal(result.ok, true);
    assert.equal(result.agentSlug, 'sin-hermesbote');
    assert.equal(result.commentId, 9001);
    assert.match(commentRequestBody, /Hello from SIN-Hermes\[bot\]/);
  } finally {
    restoreEnv();
    await new Promise((resolve, reject) => server.close((error) => (error ? reject(error) : resolve())));
  }
});