const totp = require('./totp');

console.log('=== TOTP Implementation Test Suite ===\n');

function runTests() {
  // 1. Basic Functionality Tests
  console.log('1. Basic Functionality Tests:');
  
  const testSecret = 'JBSWY3DPEHPK3PXP';
  const testTime = 1623456789000; // Fixed timestamp for consistent testing
  
  try {
    const code = totp.generate(testTime, testSecret);
    console.log('Generate TOTP code:');
    console.log(`  Secret: ${testSecret}`);
    console.log(`  Time: ${new Date(testTime).toISOString()}`);
    console.log(`  Code: ${code}`);
    console.log(`  Length: ${code.length} digits`);
    console.log('  Result: ✓ (Generated successfully)\n');
  } catch (error) {
    console.log(`  Result: ✗ (${error.message})\n`);
  }

  // 2. Verification Tests
  console.log('2. Verification Tests:');
  
  const currentCode = totp.now(testSecret);
  const verifyResults = [
    totp.verify(currentCode, testSecret),
    totp.verify('000000', testSecret),
    totp.verify(currentCode, 'WRONGSECRET')
  ];
  
  console.log('Verify current code:');
  console.log(`  Code: ${currentCode}`);
  console.log(`  Valid code: ${verifyResults[0] ? '✓' : '✗'}`);
  console.log(`  Invalid code: ${!verifyResults[1] ? '✓' : '✗'}`);
  console.log(`  Wrong secret: ${!verifyResults[2] ? '✓' : '✗'}\n`);

  // 3. Configuration Tests
  console.log('3. Configuration Tests:');
  
  const configs = [
    { digits: 8 },
    { interval: 60 },
    { algorithm: 'SHA-256' }
  ];

  configs.forEach(config => {
    try {
      const code = totp.generate(testTime, testSecret, config);
      console.log(`Custom config (${Object.keys(config)[0]}=${Object.values(config)[0]}):`);
      console.log(`  Code: ${code}`);
      console.log('  Result: ✓\n');
    } catch (error) {
      console.log(`Custom config (${Object.keys(config)[0]}=${Object.values(config)[0]}):`);
      console.log(`  Result: ✗ (${error.message})\n`);
    }
  });

  // 4. Error Handling Tests
  console.log('4. Error Handling Tests:');
  
  const errorTests = [
    ['Invalid secret', () => totp.generate(testTime, '')],
    ['Invalid digits', () => totp.generate(testTime, testSecret, { digits: 4 })],
    ['Invalid interval', () => totp.generate(testTime, testSecret, { interval: -1 })],
    ['Invalid algorithm', () => totp.generate(testTime, testSecret, { algorithm: 'INVALID' })]
  ];

  errorTests.forEach(([name, test]) => {
    try {
      test();
      console.log(`${name}: ✗ (Should have thrown)`);
    } catch (error) {
      console.log(`${name}: ✓ (${error.type})`);
    }
  });
  console.log('');

  // 5. URI Generation Test
  console.log('5. URI Generation Test:');
  
  try {
    const uri = totp.generateUri(
      testSecret,
      'test@example.com',
      'TestApp',
      { digits: 8, interval: 60 }
    );
    console.log('Generated URI:');
    console.log(`  ${uri}`);
    console.log('  Result: ✓\n');
  } catch (error) {
    console.log(`  Result: ✗ (${error.message})\n`);
  }

  // 6. Time Window Tests
  console.log('6. Time Window Tests:');
  
  const remaining = totp.timeRemaining();
  console.log(`Time until next code: ${remaining} seconds`);
  
  // Test window verification
  const currentTime = Date.now();
  const pastCode = totp.generate(currentTime - 30000, testSecret);
  const futureCode = totp.generate(currentTime + 30000, testSecret);
  
  console.log('Time window verification:');
  console.log(`  Past code valid: ${totp.verify(pastCode, testSecret, { window: 1 }) ? '✓' : '✗'}`);
  console.log(`  Future code valid: ${totp.verify(futureCode, testSecret, { window: 1 }) ? '✓' : '✗'}`);
  console.log(`  Outside window invalid: ${!totp.verify(pastCode, testSecret, { window: 0 }) ? '✓' : '✗'}\n`);

  // 7. Security Tests
  console.log('7. Security Tests:');
  
  // Test timing attack resistance
  const start = Date.now();
  for (let i = 0; i < 1000; i++) {
    totp.verify('000000', testSecret);
    totp.verify('999999', testSecret);
  }
  const end = Date.now();
  const timeDiff = Math.abs((end - start) / 2000);
  
  console.log('Timing attack resistance:');
  console.log(`  Average verification time: ${timeDiff.toFixed(3)}ms`);
  console.log(`  Time consistency: ${timeDiff < 1 ? '✓' : '✗'}`);
}

// Run all tests
runTests();