// Unit tests for null theme property protection
// These tests focus on the defensive programming fixes for GitHub issue #5021

describe('Null Theme Protection Tests', () => {
  describe('Theme object spreading with null protection', () => {
    it('should handle null theme object gracefully', () => {
      // Test the pattern used in the fix: ...(activeContext.theme || {})
      const activeContext = { theme: null };

      // This should not throw an error
      expect(() => {
        const result = {
          ...(activeContext.theme || {}),
          backgroundImageLight: 'test-url',
        };
        expect(result).toEqual({ backgroundImageLight: 'test-url' });
      }).not.toThrow();
    });

    it('should handle undefined theme object gracefully', () => {
      // Test the pattern used in the fix: ...(activeContext.theme || {})
      const activeContext = { theme: undefined };

      // This should not throw an error
      expect(() => {
        const result = {
          ...(activeContext.theme || {}),
          backgroundImageDark: 'test-url',
        };
        expect(result).toEqual({ backgroundImageDark: 'test-url' });
      }).not.toThrow();
    });

    it('should preserve existing theme properties when theme is defined', () => {
      // Test that existing theme properties are preserved
      const activeContext = {
        theme: {
          primary: '#000',
          accent: '#fff',
        },
      };

      const result = {
        ...(activeContext.theme || {}),
        backgroundImageLight: 'test-url',
      };

      expect(result).toEqual({
        primary: '#000',
        accent: '#fff',
        backgroundImageLight: 'test-url',
      });
    });
  });

  describe('Optional chaining for theme.primary access', () => {
    it('should handle null theme gracefully with optional chaining', () => {
      const project: any = { theme: null };

      // This should not throw an error and should return undefined
      const result = project.theme?.primary;
      expect(result).toBeUndefined();
    });

    it('should handle undefined theme gracefully with optional chaining', () => {
      const project: any = { theme: undefined };

      // This should not throw an error and should return undefined
      const result = project.theme?.primary;
      expect(result).toBeUndefined();
    });

    it('should return theme.primary when theme exists', () => {
      const project = { theme: { primary: '#123456' } };

      const result = project.theme?.primary;
      expect(result).toBe('#123456');
    });

    it('should fallback to default color when theme.primary is null', () => {
      const DEFAULT_COLOR = '#default';
      const project: any = { theme: { primary: null } };

      const result = project.theme?.primary || DEFAULT_COLOR;
      expect(result).toBe(DEFAULT_COLOR);
    });
  });
});
