import { _ } from '../src/chain';

const FIXED_DATE = new Date('2024-12-12T14:15:42+08:00');

jest.useFakeTimers();
jest.setSystemTime(FIXED_DATE);

describe('Chain - Date Operations', () => {
  afterAll(() => {
    jest.useRealTimers();
  });

  describe('isDateWithinRange', () => {
    it('should return true if the current date is within the range', () => {
      const startDate = new Date('2024-12-11');
      const endDate = new Date('2024-12-13');

      const result = _.chain(startDate)
        .isDateWithinRange(endDate)
        .valueOf();

      expect(result).toBe(true);
    });

    it('should return false if the current date is not within the range', () => {
      const startDate = new Date('2024-12-10');
      const endDate = new Date('2024-12-11');

      const result = _.chain(startDate)
        .isDateWithinRange(endDate)
        .valueOf();

      expect(result).toBe(false);
    });
  });
});

// Test suite for the _ class
describe('Chain - String Operations', () => {
  it('should capitalize a string', () => {
    const result = _.chain('hello world').capitalize().valueOf();
    expect(result).toBe('Hello world');
  });

  it('should truncate a string', () => {
    const result = _.chain('hello world').truncate(5).valueOf();
    expect(result).toBe('he...');
  });

  it('should convert a string to camelCase', () => {
    const result = _.chain('hello world').toCamelCase().valueOf();
    expect(result).toBe('helloWorld');
  });

  it('should convert a string to kebab-case', () => {
    const result = _.chain('hello world').toKebabCase().valueOf();
    expect(result).toBe('hello-world');
  });

  it('should convert a string to swapCase', () => {
    const result = _.chain('Hello World').swapCase().valueOf();
    expect(result).toBe('hELLO wORLD');
  });
});

// Test suite for number operations
describe('Chain - Number Operations', () => {
  it('should format a number as currency', () => {
    const result = _.chain(1234.56).formatCurrency('USD', 'en-US').valueOf();
    expect(result).toBe('$1,234.56');
  });

  it('should format a number with commas', () => {
    const result = _.chain(1234567).formatWithCommas().valueOf();
    expect(result).toBe('1,234,567');
  });

  it('should format a number as a percentage', () => {
    const result = _.chain(0.1234).formatPercentage(2).valueOf();
    expect(result).toBe('12.34%');
  });
});

// Test suite for array operations
describe('Chain - Array Operations', () => {
  it('should map over an array', () => {
    const result = _.chain([1, 2, 3]).map(x => x * 2).valueOf();
    expect(result).toEqual([2, 4, 6]);
  });

  it('should filter an array', () => {
    const result = _.chain([1, 2, 3, 4]).filter(x => x % 2 === 0).valueOf();
    expect(result).toEqual([2, 4]);
  });
});

describe('valueOf', () => {
  it('should return the internal value', () => {
    const instance = new _('test value');
    const result = instance.valueOf();
    expect(result).toBe('test value');
  });
});

describe('Chain - Object Operations', () => {
  it('should convert a flat array to query string', () => {
    const result = _.chain(['key1', 'value1', 'key2', 'value2'])
      .objectToQueryString()
      .valueOf();

    expect(result).toBe('key1=value1&key2=value2');
  });

  it('should convert a matrix array to query string', () => {
    const result = _.chain([['key1', 'value1'], ['key2', 'value2']])
      .objectToQueryString()
      .valueOf();

    expect(result).toBe('key1=value1&key2=value2');
  });

  it('should remove duplicates and then convert to query string', () => {
    const result = _.chain([1, 2, 2, 3, 4, 4, 5, 6, 6])
      .removeDuplicates()  
      .objectToQueryString()
      .valueOf(); 

    expect(result).toBe('1=2&3=4&5=6');
  });

  it('should flatten an array and then convert to query string', () => {
    const result = _.chain(['key1', 'value1', 'key2', 'value2', ['key3', 'value3']])
      .flattenArray()
      .objectToQueryString()
      .valueOf();

    expect(result).toBe('key1=value1&key2=value2&key3=value3')
  });

  it('should throw an error for an invalid flat array format (odd number of elements)', () => {
    expect(() => {
      _.chain(['key1', 'value1', 'key2'])
        .objectToQueryString()
        .valueOf();
    }).toThrow(new Error("Invalid array format: Expected either an array of key-value pairs (matrix) or a flat array with an even number of elements."));
  });

  it('should throw an error if an invalid nested array is passed after flattening', () => {
    expect(() => {
      _.chain(['key1', 'value1', 'key2', 'value2', ['key3']])
        .flattenArray()
        .objectToQueryString()
        .valueOf();
    }).toThrow(new Error("Invalid array format: Expected either an array of key-value pairs (matrix) or a flat array with an even number of elements."));
  });

  it('should throw an error if an invalid nested array is passed after flattening', () => {
    expect(() => {
      _.chain([[], []])
        .flattenArray()
        .objectToQueryString()
        .valueOf();
    }).toThrow(new Error("Invalid input format: Expected a non-empty object or a valid array format."));
  });
})