/**
 * Tests for logger-utils.js
 * Created: 2026-03-21
 */

const { sanitizeForLog, redactCredential, safeLog, SENSITIVE_FIELDS } = require('../logger-utils');

describe('logger-utils', () => {
  describe('sanitizeForLog', () => {
    test('should redact sensitive field names', () => {
      const input = {
        username: 'admin',
        password: 'secret123',
        apiKey: 'abc-def-ghi',
        token: 'xyz123'
      };

      const result = sanitizeForLog(input);

      expect(result.username).toBe('admin');
      expect(result.password).toBe('[REDACTED]');
      expect(result.apiKey).toBe('[REDACTED]');
      expect(result.token).toBe('[REDACTED]');
    });

    test('should handle nested objects', () => {
      const input = {
        user: {
          name: 'Alice',
          credentials: {
            password: 'secret',
            token: 'abc123'
          }
        }
      };

      const result = sanitizeForLog(input);

      expect(result.user.name).toBe('Alice');
      expect(result.user.credentials.password).toBe('[REDACTED]');
      expect(result.user.credentials.token).toBe('[REDACTED]');
    });

    test('should handle arrays', () => {
      const input = [
        { name: 'user1', password: 'pass1' },
        { name: 'user2', secret: 'pass2' }
      ];

      const result = sanitizeForLog(input);

      expect(result[0].name).toBe('user1');
      expect(result[0].password).toBe('[REDACTED]');
      expect(result[1].name).toBe('user2');
      expect(result[1].secret).toBe('[REDACTED]');
    });

    test('should handle null and undefined', () => {
      expect(sanitizeForLog(null)).toBeNull();
      expect(sanitizeForLog(undefined)).toBeUndefined();
    });

    test('should support additional sensitive keys', () => {
      const input = {
        email: 'user@example.com',
        ssn: '123-45-6789'
      };

      const result = sanitizeForLog(input, ['ssn']);

      expect(result.email).toBe('user@example.com');
      expect(result.ssn).toBe('[REDACTED]');
    });

    test('should be case-insensitive for field matching', () => {
      const input = {
        PASSWORD: 'secret',
        ApiKey: 'key123',
        Bearer_Token: 'token456'
      };

      const result = sanitizeForLog(input);

      expect(result.PASSWORD).toBe('[REDACTED]');
      expect(result.ApiKey).toBe('[REDACTED]');
      expect(result.Bearer_Token).toBe('[REDACTED]');
    });
  });

  describe('redactCredential', () => {
    test('should show first and last 4 characters for long strings', () => {
      const input = 'abcdefghijklmnop';
      const result = redactCredential(input);

      expect(result).toMatch(/^abcd.*mnop$/);
      expect(result).toContain('*');
    });

    test('should fully redact short strings', () => {
      expect(redactCredential('short')).toBe('[REDACTED]');
      expect(redactCredential('12345678')).toBe('[REDACTED]');
    });

    test('should handle null/undefined', () => {
      expect(redactCredential(null)).toBe('[REDACTED]');
      expect(redactCredential(undefined)).toBe('[REDACTED]');
    });

    test('should handle non-string input', () => {
      expect(redactCredential(12345)).toBe('[REDACTED]');
      expect(redactCredential({})).toBe('[REDACTED]');
    });

    test('should limit middle asterisks to 10', () => {
      const input = 'a'.repeat(100);
      const result = redactCredential(input);

      const asteriskMatch = result.match(/\*/g);
      expect(asteriskMatch).toBeTruthy();
      expect(asteriskMatch.length).toBe(10);
    });
  });

  describe('safeLog', () => {
    test('should create safe log object with message and sanitized data', () => {
      const result = safeLog('User login', {
        username: 'alice',
        password: 'secret123'
      });

      expect(result).toHaveProperty('message', 'User login');
      expect(result).toHaveProperty('timestamp');
      expect(result.data.username).toBe('alice');
      expect(result.data.password).toBe('[REDACTED]');
    });

    test('should include timestamp in ISO format', () => {
      const result = safeLog('Test message');

      expect(result.timestamp).toMatch(/^\d{4}-\d{2}-\d{2}T/);
    });

    test('should handle empty data', () => {
      const result = safeLog('Test message');

      expect(result.message).toBe('Test message');
      expect(result.data).toEqual({});
    });
  });

  describe('SENSITIVE_FIELDS constant', () => {
    test('should include common sensitive field names', () => {
      expect(SENSITIVE_FIELDS).toContain('password');
      expect(SENSITIVE_FIELDS).toContain('token');
      expect(SENSITIVE_FIELDS).toContain('secret');
      expect(SENSITIVE_FIELDS).toContain('apiKey');
      expect(SENSITIVE_FIELDS).toContain('privateKey');
    });

    test('should have reasonable length', () => {
      expect(SENSITIVE_FIELDS.length).toBeGreaterThan(10);
    });
  });
});