import {
  validateSerial,
  isValidSerial,
  isDemoSerial,
  getSerialErrorMessage,
  formatSerialForDisplay,
  getSerialPlaceholder,
} from '../serialValidation';

describe('Serial Validation', () => {
  describe('validateSerial', () => {
    // Production format tests
    it('should validate production format WELLNUO-XXXX-XXXX', () => {
      const result = validateSerial('WELLNUO-1234-5678');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('production');
      expect(result.normalized).toBe('WELLNUO-1234-5678');
      expect(result.error).toBeUndefined();
    });

    it('should validate production format with lowercase', () => {
      const result = validateSerial('wellnuo-abcd-efgh');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('production');
      expect(result.normalized).toBe('WELLNUO-ABCD-EFGH');
    });

    it('should validate production format with mixed case and spaces', () => {
      const result = validateSerial('  WeLlNuO-1a2B-3c4D  ');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('production');
      expect(result.normalized).toBe('WELLNUO-1A2B-3C4D');
    });

    // Demo serial tests
    it('should validate demo serial DEMO-00000', () => {
      const result = validateSerial('DEMO-00000');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('demo');
      expect(result.normalized).toBe('DEMO-00000');
    });

    it('should validate demo serial DEMO-1234-5678', () => {
      const result = validateSerial('DEMO-1234-5678');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('demo');
      expect(result.normalized).toBe('DEMO-1234-5678');
    });

    it('should validate demo serial with lowercase', () => {
      const result = validateSerial('demo-00000');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('demo');
      expect(result.normalized).toBe('DEMO-00000');
    });

    // Legacy format tests
    it('should validate legacy 8-character alphanumeric', () => {
      const result = validateSerial('ABC12345');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('legacy');
      expect(result.normalized).toBe('ABC12345');
    });

    it('should validate legacy format with hyphens', () => {
      const result = validateSerial('ABC-123-456');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('legacy');
      expect(result.normalized).toBe('ABC-123-456');
    });

    it('should validate legacy 16-character serial', () => {
      const result = validateSerial('ABCDEFGH12345678');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('legacy');
      expect(result.normalized).toBe('ABCDEFGH12345678');
    });

    // Invalid format tests
    it('should reject empty string', () => {
      const result = validateSerial('');
      expect(result.isValid).toBe(false);
      expect(result.format).toBe('invalid');
      expect(result.error).toBe('Serial number is required');
    });

    it('should reject null', () => {
      const result = validateSerial(null);
      expect(result.isValid).toBe(false);
      expect(result.format).toBe('invalid');
      expect(result.error).toBe('Serial number is required');
    });

    it('should reject undefined', () => {
      const result = validateSerial(undefined);
      expect(result.isValid).toBe(false);
      expect(result.format).toBe('invalid');
      expect(result.error).toBe('Serial number is required');
    });

    it('should reject strings with only spaces', () => {
      const result = validateSerial('   ');
      expect(result.isValid).toBe(false);
      expect(result.format).toBe('invalid');
      expect(result.error).toBe('Serial number is required');
    });

    it('should reject too short serial (less than 8 chars)', () => {
      const result = validateSerial('ABC123');
      expect(result.isValid).toBe(false);
      expect(result.format).toBe('invalid');
      expect(result.error).toBe('Serial number must be at least 8 characters');
    });

    it('should reject serial with special characters', () => {
      const result = validateSerial('ABC123!@#');
      expect(result.isValid).toBe(false);
      expect(result.format).toBe('invalid');
      expect(result.error).toBe('Serial number can only contain letters, numbers, and hyphens');
    });

    it('should accept serials with wrong prefix as legacy format', () => {
      const result = validateSerial('BADNAME-1234-5678');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('legacy'); // Valid as legacy, not production
    });

    it('should accept malformed production format as legacy', () => {
      const result = validateSerial('WELLNUO-123-5678'); // only 3 chars in middle
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('legacy'); // Valid as legacy, not production
    });

    it('should accept serials with extra hyphens as legacy', () => {
      const result = validateSerial('WELLNUO-12-34-5678');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('legacy'); // Valid as legacy, not production
    });

    it('should reject production format without hyphens', () => {
      const result = validateSerial('WELLNUO12345678');
      expect(result.isValid).toBe(true); // Actually valid as legacy format
      expect(result.format).toBe('legacy'); // Not production
    });
  });

  describe('isValidSerial', () => {
    it('should return true for valid production serial', () => {
      expect(isValidSerial('WELLNUO-1234-5678')).toBe(true);
    });

    it('should return true for valid demo serial', () => {
      expect(isValidSerial('DEMO-00000')).toBe(true);
    });

    it('should return true for valid legacy serial', () => {
      expect(isValidSerial('ABC12345')).toBe(true);
    });

    it('should return false for invalid serial', () => {
      expect(isValidSerial('ABC')).toBe(false);
    });

    it('should return false for null', () => {
      expect(isValidSerial(null)).toBe(false);
    });

    it('should return false for undefined', () => {
      expect(isValidSerial(undefined)).toBe(false);
    });
  });

  describe('isDemoSerial', () => {
    it('should return true for DEMO-00000', () => {
      expect(isDemoSerial('DEMO-00000')).toBe(true);
    });

    it('should return true for DEMO-1234-5678', () => {
      expect(isDemoSerial('DEMO-1234-5678')).toBe(true);
    });

    it('should return true for lowercase demo serial', () => {
      expect(isDemoSerial('demo-00000')).toBe(true);
    });

    it('should return true for demo serial with spaces', () => {
      expect(isDemoSerial('  DEMO-00000  ')).toBe(true);
    });

    it('should return false for production serial', () => {
      expect(isDemoSerial('WELLNUO-1234-5678')).toBe(false);
    });

    it('should return false for legacy serial', () => {
      expect(isDemoSerial('ABC12345')).toBe(false);
    });

    it('should return false for null', () => {
      expect(isDemoSerial(null)).toBe(false);
    });

    it('should return false for undefined', () => {
      expect(isDemoSerial(undefined)).toBe(false);
    });
  });

  describe('getSerialErrorMessage', () => {
    it('should return empty string for valid serial', () => {
      expect(getSerialErrorMessage('WELLNUO-1234-5678')).toBe('');
    });

    it('should return error for empty string', () => {
      const error = getSerialErrorMessage('');
      expect(error).toBeTruthy();
      expect(error).toContain('required');
    });

    it('should return error for null', () => {
      const error = getSerialErrorMessage(null);
      expect(error).toBeTruthy();
      expect(error).toContain('required');
    });

    it('should return error for too short serial', () => {
      const error = getSerialErrorMessage('ABC');
      expect(error).toBeTruthy();
      expect(error).toContain('8 characters');
    });

    it('should return error for serial with special characters', () => {
      const error = getSerialErrorMessage('ABC123!@#');
      expect(error).toBeTruthy();
      expect(error).toContain('letters, numbers, and hyphens');
    });

    it('should return specific error for too short serial', () => {
      const error = getSerialErrorMessage('ABC');
      expect(error).toContain('8 characters');
    });
  });

  describe('formatSerialForDisplay', () => {
    it('should add hyphens to production serial without hyphens', () => {
      const formatted = formatSerialForDisplay('WELLNUO12345678');
      expect(formatted).toBe('WELLNUO-1234-5678');
    });

    it('should keep hyphens in production serial with hyphens', () => {
      const formatted = formatSerialForDisplay('WELLNUO-1234-5678');
      expect(formatted).toBe('WELLNUO-1234-5678');
    });

    it('should uppercase and trim', () => {
      const formatted = formatSerialForDisplay('  wellnuo-abcd-efgh  ');
      expect(formatted).toBe('WELLNUO-ABCD-EFGH');
    });

    it('should not modify demo serial', () => {
      const formatted = formatSerialForDisplay('DEMO-00000');
      expect(formatted).toBe('DEMO-00000');
    });

    it('should not modify legacy serial', () => {
      const formatted = formatSerialForDisplay('ABC12345');
      expect(formatted).toBe('ABC12345');
    });

    it('should uppercase lowercase serial', () => {
      const formatted = formatSerialForDisplay('abc12345');
      expect(formatted).toBe('ABC12345');
    });
  });

  describe('getSerialPlaceholder', () => {
    it('should return production placeholder by default', () => {
      const placeholder = getSerialPlaceholder();
      expect(placeholder).toBe('WELLNUO-XXXX-XXXX');
    });

    it('should return production placeholder when preferProduction is true', () => {
      const placeholder = getSerialPlaceholder(true);
      expect(placeholder).toBe('WELLNUO-XXXX-XXXX');
    });

    it('should return generic placeholder when preferProduction is false', () => {
      const placeholder = getSerialPlaceholder(false);
      expect(placeholder).toBe('Enter serial number');
    });
  });

  describe('Edge cases', () => {
    it('should handle very long serials', () => {
      const longSerial = 'A'.repeat(100);
      const result = validateSerial(longSerial);
      expect(result.isValid).toBe(true); // Valid as legacy
      expect(result.format).toBe('legacy');
    });

    it('should handle serials with multiple hyphens', () => {
      const result = validateSerial('ABC-123-456-789');
      expect(result.isValid).toBe(true); // Valid as legacy
      expect(result.format).toBe('legacy');
    });

    it('should handle numeric-only serials', () => {
      const result = validateSerial('12345678');
      expect(result.isValid).toBe(true); // Valid as legacy
      expect(result.format).toBe('legacy');
    });

    it('should handle mixed case in production format', () => {
      const result = validateSerial('WeLlNuO-AbCd-EfGh');
      expect(result.isValid).toBe(true);
      expect(result.format).toBe('production');
      expect(result.normalized).toBe('WELLNUO-ABCD-EFGH');
    });
  });
});