/**
 * Security Module Tests
 *
 * Unit tests for crypto utilities, security utils, and audit logging.
 */

import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';

// ============================================================================
// Crypto Utils Tests
// ============================================================================

describe('Crypto Utils', () => {
  // Import dynamically to handle Web Crypto API
  let cryptoUtils: typeof import('../../src/lib/crypto-utils');

  beforeEach(async () => {
    cryptoUtils = await import('../../src/lib/crypto-utils');
  });

  describe('arrayToBase64 / base64ToArray', () => {
    it('should convert Uint8Array to base64 and back', () => {
      const original = new Uint8Array([72, 101, 108, 108, 111]);
      const base64 = cryptoUtils.arrayToBase64(original);
      const decoded = cryptoUtils.base64ToArray(base64);

      expect(decoded).toEqual(original);
    });

    it('should handle empty array', () => {
      const empty = new Uint8Array([]);
      expect(cryptoUtils.arrayToBase64(empty)).toBe('');
      expect(cryptoUtils.base64ToArray('')).toEqual(empty);
    });
  });

  describe('deriveKey', () => {
    it('should derive a CryptoKey from a master key', async () => {
      const key = await cryptoUtils.deriveKey('test-master-key');

      expect(key).toBeDefined();
      expect(key.type).toBe('secret');
    });

    it('should derive the same key for the same input', async () => {
      const key1 = await cryptoUtils.deriveKey('test-master-key');
      const key2 = await cryptoUtils.deriveKey('test-master-key');

      // Both should be valid CryptoKey objects
      expect(key1).toBeDefined();
      expect(key2).toBeDefined();
    });

    it('should use custom salt', async () => {
      const customSalt = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
      const key = await cryptoUtils.deriveKey('test-master-key', customSalt);

      expect(key).toBeDefined();
    });
  });

  describe('encrypt / decrypt', () => {
    it('should encrypt and decrypt a string', async () => {
      const key = await cryptoUtils.deriveKey('test-master-key');
      const plaintext = 'Hello, World!';

      const encrypted = await cryptoUtils.encrypt(plaintext, key);
      expect(encrypted.iv).toBeDefined();
      expect(encrypted.data).toBeDefined();
      expect(encrypted.version).toBe(1);

      const decrypted = await cryptoUtils.decrypt(encrypted, key);
      expect(decrypted).toBe(plaintext);
    });

    it('should produce different IVs for same plaintext', async () => {
      const key = await cryptoUtils.deriveKey('test-master-key');
      const plaintext = 'Same text';

      const encrypted1 = await cryptoUtils.encrypt(plaintext, key);
      const encrypted2 = await cryptoUtils.encrypt(plaintext, key);

      expect(encrypted1.iv).not.toBe(encrypted2.iv);
    });

    it('should handle empty string', async () => {
      const key = await cryptoUtils.deriveKey('test-master-key');
      const plaintext = '';

      const encrypted = await cryptoUtils.encrypt(plaintext, key);
      const decrypted = await cryptoUtils.decrypt(encrypted, key);

      expect(decrypted).toBe('');
    });

    it('should handle unicode characters', async () => {
      const key = await cryptoUtils.deriveKey('test-master-key');
      const plaintext = '中文测试 日本語 한국어 🎉';

      const encrypted = await cryptoUtils.encrypt(plaintext, key);
      const decrypted = await cryptoUtils.decrypt(encrypted, key);

      expect(decrypted).toBe(plaintext);
    });
  });

  describe('encryptObject / decryptObject', () => {
    it('should encrypt and decrypt an object', async () => {
      const key = await cryptoUtils.deriveKey('test-master-key');
      const obj = { name: 'test', count: 42, nested: { a: 1 } };

      const encrypted = await cryptoUtils.encryptObject(obj, key);
      const decrypted = await cryptoUtils.decryptObject<typeof obj>(encrypted, key);

      expect(decrypted).toEqual(obj);
    });
  });

  describe('generateMasterKey', () => {
    it('should generate a base64 string', () => {
      const key = cryptoUtils.generateMasterKey();

      expect(typeof key).toBe('string');
      expect(key.length).toBeGreaterThan(0);
    });

    it('should generate unique keys', () => {
      const key1 = cryptoUtils.generateMasterKey();
      const key2 = cryptoUtils.generateMasterKey();

      expect(key1).not.toBe(key2);
    });
  });

  describe('hashSha256', () => {
    it('should produce consistent hash', async () => {
      const input = 'test-input';
      const hash1 = await cryptoUtils.hashSha256(input);
      const hash2 = await cryptoUtils.hashSha256(input);

      expect(hash1).toBe(hash2);
      expect(hash1.length).toBe(64); // SHA-256 produces 64 hex chars
    });
  });

  describe('constantTimeEqual', () => {
    it('should return true for equal arrays', () => {
      const a = new Uint8Array([1, 2, 3, 4]);
      const b = new Uint8Array([1, 2, 3, 4]);

      expect(cryptoUtils.constantTimeEqual(a, b)).toBe(true);
    });

    it('should return false for different arrays', () => {
      const a = new Uint8Array([1, 2, 3, 4]);
      const b = new Uint8Array([1, 2, 3, 5]);

      expect(cryptoUtils.constantTimeEqual(a, b)).toBe(false);
    });

    it('should return false for different length arrays', () => {
      const a = new Uint8Array([1, 2, 3]);
      const b = new Uint8Array([1, 2, 3, 4]);

      expect(cryptoUtils.constantTimeEqual(a, b)).toBe(false);
    });
  });

  describe('isValidEncryptedData', () => {
    it('should validate correct structure', () => {
      const valid = { iv: 'abc', data: 'xyz' };
      expect(cryptoUtils.isValidEncryptedData(valid)).toBe(true);
    });

    it('should reject invalid structures', () => {
      expect(cryptoUtils.isValidEncryptedData(null)).toBe(false);
      expect(cryptoUtils.isValidEncryptedData({})).toBe(false);
      expect(cryptoUtils.isValidEncryptedData({ iv: '' })).toBe(false);
      expect(cryptoUtils.isValidEncryptedData({ data: '' })).toBe(false);
    });
  });
});

// ============================================================================
// Security Utils Tests
// ============================================================================

describe('Security Utils', () => {
  let securityUtils: typeof import('../security-utils');

  beforeEach(async () => {
    securityUtils = await import('../security-utils');
  });

  describe('escapeHtml', () => {
    it('should escape HTML special characters', () => {
      const input = '<script>alert("xss")</script>';
      const escaped = securityUtils.escapeHtml(input);

      expect(escaped).toBe('&lt;script&gt;alert(&quot;xss&quot;)&lt;&#x2F;script&gt;');
    });

    it('should handle plain text', () => {
      const input = 'Hello, World!';
      expect(securityUtils.escapeHtml(input)).toBe(input);
    });

    it('should handle ampersand', () => {
      expect(securityUtils.escapeHtml('a & b')).toBe('a &amp; b');
    });
  });

  describe('sanitizeHtml', () => {
    it('should remove script tags', () => {
      const html = '<p>Hello</p><script>alert("xss")</script>';
      const sanitized = securityUtils.sanitizeHtml(html);

      expect(sanitized).not.toContain('<script>');
      expect(sanitized).toContain('<p>');
    });

    it('should remove event handlers', () => {
      const html = '<div onclick="alert(1)">Click me</div>';
      const sanitized = securityUtils.sanitizeHtml(html);

      expect(sanitized).not.toContain('onclick');
    });

    it('should remove javascript: URLs', () => {
      const html = '<a href="javascript:alert(1)">Link</a>';
      const sanitized = securityUtils.sanitizeHtml(html);

      expect(sanitized).not.toContain('javascript:');
    });

    it('should preserve allowed tags', () => {
      const html = '<p><strong>Bold</strong> and <em>italic</em></p>';
      const sanitized = securityUtils.sanitizeHtml(html);

      expect(sanitized).toContain('<p>');
      expect(sanitized).toContain('<strong>');
      expect(sanitized).toContain('<em>');
    });
  });

  describe('validateUrl', () => {
    it('should validate http URLs', () => {
      const url = 'https://example.com/path';
      expect(securityUtils.validateUrl(url)).toBe(url);
    });

    it('should reject javascript: URLs', () => {
      expect(securityUtils.validateUrl('javascript:alert(1)')).toBeNull();
    });

    it('should reject data: URLs by default', () => {
      expect(securityUtils.validateUrl('data:text/html,<script>alert(1)</script>')).toBeNull();
    });

    it('should reject localhost when not allowed', () => {
      expect(
        securityUtils.validateUrl('http://localhost:3000', { allowLocalhost: false })
      ).toBeNull();
    });

    it('should allow localhost when allowed', () => {
      const url = 'http://localhost:3000';
      expect(
        securityUtils.validateUrl(url, { allowLocalhost: true })
      ).toBe(url);
    });
  });

  describe('validatePath', () => {
    it('should reject path traversal', () => {
      expect(securityUtils.validatePath('../../../etc/passwd')).toBeNull();
    });

    it('should reject null bytes', () => {
      expect(securityUtils.validatePath('file\0.txt')).toBeNull();
    });

    it('should reject absolute paths when not allowed', () => {
      expect(
        securityUtils.validatePath('/etc/passwd', { allowAbsolute: false })
      ).toBeNull();
    });

    it('should validate relative paths', () => {
      const result = securityUtils.validatePath('folder/file.txt');
      expect(result).toBe('folder/file.txt');
    });
  });

  describe('isValidEmail', () => {
    it('should validate correct emails', () => {
      expect(securityUtils.isValidEmail('test@example.com')).toBe(true);
      expect(securityUtils.isValidEmail('user.name@subdomain.example.com')).toBe(true);
    });

    it('should reject invalid emails', () => {
      expect(securityUtils.isValidEmail('not-an-email')).toBe(false);
      expect(securityUtils.isValidEmail('@example.com')).toBe(false);
      expect(securityUtils.isValidEmail('test@')).toBe(false);
    });
  });

  describe('validatePasswordStrength', () => {
    it('should accept strong passwords', () => {
      const result = securityUtils.validatePasswordStrength('Str0ng!Pass');
      expect(result.valid).toBe(true);
      expect(result.score).toBeGreaterThan(50);
    });

    it('should reject short passwords', () => {
      const result = securityUtils.validatePasswordStrength('short');
      expect(result.valid).toBe(false);
      expect(result.issues).toContain('Password must be at least 8 characters');
    });

    it('should detect weak patterns', () => {
      const result = securityUtils.validatePasswordStrength('password123');
      expect(result.issues).toContain('Password contains a common pattern');
    });
  });

  describe('sanitizeFilename', () => {
    it('should remove path separators', () => {
      expect(securityUtils.sanitizeFilename('../test.txt')).toBe('.._test.txt');
    });

    it('should remove dangerous characters', () => {
      const sanitized = securityUtils.sanitizeFilename('file<>:"|?*.txt');
      expect(sanitized).not.toMatch(/[<>:"|?*]/);
    });

    it('should handle normal filenames', () => {
      expect(securityUtils.sanitizeFilename('document.pdf')).toBe('document.pdf');
    });
  });

  describe('sanitizeJson', () => {
    it('should parse valid JSON', () => {
      const result = securityUtils.sanitizeJson('{"name":"test"}');
      expect(result).toEqual({ name: 'test' });
    });

    it('should remove prototype pollution keys', () => {
      const result = securityUtils.sanitizeJson('{"__proto__":{"admin":true},"name":"test"}');
      expect(result).not.toHaveProperty('__proto__');
    });

    it('should return null for invalid JSON', () => {
      expect(securityUtils.sanitizeJson('not json')).toBeNull();
    });
  });

  describe('isRateLimited', () => {
    beforeEach(() => {
      // Clear rate limit store
      vi.useFakeTimers();
    });

    afterEach(() => {
      vi.useRealTimers();
    });

    it('should allow first request', () => {
      expect(securityUtils.isRateLimited('test-key', 5, 60000)).toBe(false);
    });

    it('should block after limit reached', () => {
      for (let i = 0; i < 5; i++) {
        securityUtils.isRateLimited('test-key', 5, 60000);
      }
      expect(securityUtils.isRateLimited('test-key', 5, 60000)).toBe(true);
    });

    it('should reset after window expires', () => {
      for (let i = 0; i < 5; i++) {
        securityUtils.isRateLimited('test-key', 5, 60000);
      }
      expect(securityUtils.isRateLimited('test-key', 5, 60000)).toBe(true);

      // Advance time past window
      vi.advanceTimersByTime(61000);
      expect(securityUtils.isRateLimited('test-key', 5, 60000)).toBe(false);
    });
  });

  describe('generateSecureToken', () => {
    it('should generate hex string of correct length', () => {
      const token = securityUtils.generateSecureToken(16);
      expect(token.length).toBe(32); // 16 bytes = 32 hex chars
    });

    it('should generate unique tokens', () => {
      const token1 = securityUtils.generateSecureToken();
      const token2 = securityUtils.generateSecureToken();
      expect(token1).not.toBe(token2);
    });
  });

  describe('generateSecureId', () => {
    it('should generate ID with prefix', () => {
      const id = securityUtils.generateSecureId('user');
      expect(id.startsWith('user_')).toBe(true);
    });

    it('should generate ID without prefix', () => {
      const id = securityUtils.generateSecureId();
      expect(id).toMatch(/^\w+_\w+$/);
    });
  });
});

// ============================================================================
// Security Audit Tests
// ============================================================================

describe('Security Audit', () => {
  let securityAudit: typeof import('../security-audit');

  beforeEach(async () => {
    securityAudit = await import('../security-audit');
    localStorage.clear();
  });

  afterEach(() => {
    securityAudit.clearSecurityAuditLog();
  });

  describe('logSecurityEvent', () => {
    it('should log security events', () => {
      securityAudit.logSecurityEvent('auth_login', 'User logged in', { userId: '123' });

      const events = securityAudit.getSecurityEvents();
      expect(events.length).toBe(1);
      expect(events[0].type).toBe('auth_login');
      expect(events[0].message).toBe('User logged in');
    });

    it('should determine severity automatically', () => {
      securityAudit.logSecurityEvent('security_violation', 'Test violation');
      securityAudit.logSecurityEvent('auth_login', 'Test login');

      const events = securityAudit.getSecurityEvents();
      expect(events[0].severity).toBe('critical');
      expect(events[1].severity).toBe('info');
    });
  });

  describe('getSecurityEventsByType', () => {
    it('should filter events by type', () => {
      securityAudit.logSecurityEvent('auth_login', 'Login 1');
      securityAudit.logSecurityEvent('auth_logout', 'Logout');
      securityAudit.logSecurityEvent('auth_login', 'Login 2');

      const loginEvents = securityAudit.getSecurityEventsByType('auth_login');
      expect(loginEvents.length).toBe(2);
    });
  });

  describe('getSecurityEventsBySeverity', () => {
    it('should filter events by severity', () => {
      securityAudit.logSecurityEvent('auth_login', 'Login', {}, 'info');
      securityAudit.logSecurityEvent('auth_failed', 'Failed', {}, 'warning');

      const infoEvents = securityAudit.getSecurityEventsBySeverity('info');
      expect(infoEvents.length).toBe(1);
    });
  });

  describe('generateSecurityAuditReport', () => {
    it('should generate a report', () => {
      securityAudit.logSecurityEvent('auth_login', 'Login');
      securityAudit.logSecurityEvent('auth_failed', 'Failed');
      securityAudit.logSecurityEvent('security_violation', 'Violation');

      const report = securityAudit.generateSecurityAuditReport();

      expect(report.totalEvents).toBe(3);
      expect(report.eventsByType.auth_login).toBe(1);
      expect(report.eventsBySeverity.critical).toBe(1);
    });
  });

  describe('setAuditEnabled', () => {
    it('should disable logging when set to false', () => {
      securityAudit.setAuditEnabled(false);
      securityAudit.logSecurityEvent('auth_login', 'Should not log');
      securityAudit.setAuditEnabled(true);

      const events = securityAudit.getSecurityEvents();
      // Only the config_changed event should be logged
      const loginEvents = events.filter(e => e.type === 'auth_login');
      expect(loginEvents.length).toBe(0);
    });
  });
});