/**
 * Unit tests for utils/mailbox.js
 * Run: node tests/mailbox-path.test.js
 */
const assert = require('assert');
const fs = require('fs');
const os = require('os');
const path = require('path');

const {
  normalizeMailbox,
  buildPath,
  withMailboxHeaders,
  parseSharedMailboxEnv,
  loadMailboxCache,
  saveMailboxCache,
  encodeGraphPath,
  decodeJwtPayload,
  analyzeTokenScopes
} = require('../utils/mailbox');

// --- normalizeMailbox ---
assert.deepStrictEqual(normalizeMailbox(undefined).kind, 'me');
assert.deepStrictEqual(normalizeMailbox(null).graphRoot, 'me');
assert.deepStrictEqual(normalizeMailbox('').graphRoot, 'me');
assert.deepStrictEqual(normalizeMailbox('me').graphRoot, 'me');
assert.deepStrictEqual(normalizeMailbox('PRIMARY').graphRoot, 'me');

const shared = normalizeMailbox('HelpDesk@Contoso.com');
assert.strictEqual(shared.kind, 'user');
assert.strictEqual(shared.smtpOrUpn, 'HelpDesk@Contoso.com');
assert.strictEqual(shared.key, 'helpdesk@contoso.com');
assert.strictEqual(shared.graphRoot, 'users/HelpDesk@Contoso.com');

const mailto = normalizeMailbox('mailto:it@springfieldy.org');
assert.strictEqual(mailto.smtpOrUpn, 'it@springfieldy.org');
assert.strictEqual(mailto.graphRoot, 'users/it@springfieldy.org');

const angled = normalizeMailbox('<desk@example.com>');
assert.strictEqual(angled.smtpOrUpn, 'desk@example.com');
console.log('✅ normalizeMailbox');

// --- buildPath ---
assert.strictEqual(buildPath(null, 'messages'), 'me/messages');
assert.strictEqual(buildPath('me', 'mailFolders/inbox/messages'), 'me/mailFolders/inbox/messages');
assert.strictEqual(
  buildPath('helpdesk@contoso.com', 'messages'),
  'users/helpdesk@contoso.com/messages'
);
assert.strictEqual(
  buildPath('helpdesk@contoso.com', '/mailFolders/sentItems/messages'),
  'users/helpdesk@contoso.com/mailFolders/sentItems/messages'
);
assert.strictEqual(buildPath(shared, 'sendMail'), 'users/HelpDesk@Contoso.com/sendMail');
console.log('✅ buildPath');

// --- encode once (same as callGraphAPI) ---
const encoded = encodeGraphPath('users/helpdesk@contoso.com/messages');
assert.strictEqual(encoded, 'users/helpdesk%40contoso.com/messages');
assert.ok(!encoded.includes('%2540'), 'must not double-encode @');
console.log('✅ encodeGraphPath single-encode');

// --- headers ---
assert.deepStrictEqual(withMailboxHeaders(null), {});
assert.deepStrictEqual(withMailboxHeaders('me'), {});
assert.deepStrictEqual(withMailboxHeaders('it@x.org'), { 'X-AnchorMailbox': 'it@x.org' });
console.log('✅ withMailboxHeaders');

// --- env parse ---
assert.deepStrictEqual(parseSharedMailboxEnv(''), []);
assert.deepStrictEqual(parseSharedMailboxEnv(undefined), []);
assert.deepStrictEqual(
  parseSharedMailboxEnv('a@x.com, b@y.com;c@z.com  d@w.com'),
  ['a@x.com', 'b@y.com', 'c@z.com', 'd@w.com']
);
console.log('✅ parseSharedMailboxEnv');

// --- cache round-trip ---
const tmp = path.join(os.tmpdir(), `outlook-mcp-mb-cache-${Date.now()}.json`);
try {
  const empty = loadMailboxCache(tmp);
  assert.strictEqual(empty.mailboxes.length, 0);

  saveMailboxCache([
    {
      address: 'helpdesk@contoso.com',
      displayName: 'Help Desk',
      capabilities: { read: true, listFolders: true, sendAs: 'unverified' },
      source: ['env', 'probe']
    }
  ], tmp);

  const loaded = loadMailboxCache(tmp);
  assert.strictEqual(loaded.mailboxes.length, 1);
  assert.strictEqual(loaded.mailboxes[0].address, 'helpdesk@contoso.com');
  assert.ok(loaded.mailboxes[0].source.includes('env'));
  assert.ok(loaded.mailboxes[0].lastProbedAt);

  // upsert merges sources
  saveMailboxCache([
    {
      address: 'helpdesk@contoso.com',
      capabilities: { read: true, listFolders: true, sendAs: 'unverified' },
      source: ['candidates']
    }
  ], tmp);
  const merged = loadMailboxCache(tmp);
  assert.ok(merged.mailboxes[0].source.includes('candidates'));
  assert.ok(merged.mailboxes[0].source.includes('env'));
  console.log('✅ mailbox cache round-trip');
} finally {
  try { fs.unlinkSync(tmp); } catch { /* ignore */ }
}

// --- JWT decode / scope analysis ---
function makeJwt(payload) {
  const h = Buffer.from(JSON.stringify({ alg: 'none' })).toString('base64url');
  const p = Buffer.from(JSON.stringify(payload)).toString('base64url');
  return `${h}.${p}.sig`;
}
const tok = makeJwt({ scp: 'Mail.Read Mail.Read.Shared User.Read offline_access' });
const analyzed = analyzeTokenScopes(tok);
assert.ok(analyzed.present.includes('Mail.Read.Shared'));
assert.ok(analyzed.missing.includes('Mail.Send.Shared'));
assert.ok(analyzed.missing.includes('Mail.ReadWrite.Shared'));
assert.strictEqual(decodeJwtPayload('not-a-jwt'), null);
console.log('✅ analyzeTokenScopes / decodeJwtPayload');

console.log('\nAll mailbox-path tests passed.');