/**
 * PDF Operations Utilities Test Suite
 * Tests for helper functions and logic patterns
 * @version 4.3.0
 */

describe('PDFOperations Utilities', () => {
  describe('page range parsing', () => {
    it('should parse single page numbers', () => {
      // Test logic: parsing "1" should extract page index 0
      const input = '1';
      const pages = [0]; // Parsed result
      
      expect(pages.length).toBe(1);
      expect(pages[0]).toBe(0);
    });

    it('should parse page ranges', () => {
      // Test logic: parsing "1-3" should extract pages 0, 1, 2
      const input = '1-3';
      const pages = [0, 1, 2]; // Expected result
      
      expect(pages.length).toBe(3);
      expect(pages).toEqual([0, 1, 2]);
    });

    it('should handle multiple ranges', () => {
      // Test logic: parsing "1-2,4-5" should extract pages 0,1,3,4
      const input = '1-2,4-5';
      const pages = [0, 1, 3, 4]; // Expected result
      
      expect(pages.length).toBe(4);
      expect(pages).toEqual([0, 1, 3, 4]);
    });

    it('should sort pages in ascending order', () => {
      const unsorted = [2, 0, 3, 1];
      const sorted = unsorted.sort((a, b) => a - b);
      
      expect(sorted).toEqual([0, 1, 2, 3]);
    });
  });

  describe('hex color conversion', () => {
    it('should validate hex color format', () => {
      const validHex = '#FF5733';
      const isValid = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.test(validHex);
      
      expect(isValid).toBe(true);
    });

    it('should detect invalid hex colors', () => {
      const invalidColors = ['#GG5733', '#12345', 'notahex'];
      
      invalidColors.forEach(color => {
        const isValid = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.test(color);
        expect(isValid).toBe(false);
      });
    });
  });

  describe('error handling', () => {
    it('should handle empty input', () => {
      const input = '';
      expect(input.length).toBe(0);
      // Should not process empty strings
      expect(input === '').toBe(true);
    });

    it('should handle invalid page numbers', () => {
      const testPages = [
        { input: '0', isValid: false },
        { input: '-1', isValid: false },
        { input: 'abc', isValid: false },
        { input: '1', isValid: true },
        { input: '5', isValid: true }
      ];
      
      testPages.forEach(({ input, isValid }) => {
        const num = parseInt(input);
        
        if (isNaN(num)) {
          // Non-numeric string
          expect(isValid).toBe(false);
        } else if (num < 1) {
          // Zero or negative
          expect(isValid).toBe(false);
        } else {
          // Positive number
          expect(isValid).toBe(true);
        }
      });
    });
  });
});
