import {
  currencyToAmount,
  getNumberFormat,
  looselyParseAmount,
  setNumberFormat,
  stringToInteger,
  titleFirst,
} from './util';

describe('utility functions', () => {
  test('looseParseAmount works with basic numbers', () => {
    // Parsing is currently limited to 1,2 decimal places or 5-9.
    // Ignoring 3 places removes the possibility of improper parse
    //  of amounts without decimal amounts included.
    expect(looselyParseAmount('3')).toBe(3);
    expect(looselyParseAmount('3.4')).toBe(3.4);
    expect(looselyParseAmount('3.45')).toBe(3.45);
    // cant tell if this next case should be decimal or different format
    // so we set as full numbers
    expect(looselyParseAmount('3.456')).toBe(3456); // the expected failing case
    expect(looselyParseAmount('3.4500')).toBe(3.45);
    expect(looselyParseAmount('3.45000')).toBe(3.45);
    expect(looselyParseAmount('3.450000')).toBe(3.45);
    expect(looselyParseAmount('3.4500000')).toBe(3.45);
    expect(looselyParseAmount('3.45000000')).toBe(3.45);
    expect(looselyParseAmount('3.450000000')).toBe(3.45);
  });

  test('looseParseAmount works with alternate formats', () => {
    expect(looselyParseAmount('3,45')).toBe(3.45);
    expect(looselyParseAmount('3,456')).toBe(3456); //expected failing case
    expect(looselyParseAmount('3,4500')).toBe(3.45);
    expect(looselyParseAmount('3,45000')).toBe(3.45);
    expect(looselyParseAmount('3,450000')).toBe(3.45);
    expect(looselyParseAmount('3,4500000')).toBe(3.45);
    expect(looselyParseAmount('3,45000000')).toBe(3.45);
    expect(looselyParseAmount('3,450000000')).toBe(3.45);
    expect(looselyParseAmount("3'456.78")).toBe(3456.78);
    expect(looselyParseAmount("3'456.78000")).toBe(3456.78);
    expect(looselyParseAmount('1,00,000.99')).toBe(100000.99);
    expect(looselyParseAmount('1,00,000.99000')).toBe(100000.99);
  });

  test('looseParseAmount works with leading decimal characters', () => {
    expect(looselyParseAmount('.45')).toBe(0.45);
    expect(looselyParseAmount(',45')).toBe(0.45);
  });

  test('looseParseAmount works with negative numbers', () => {
    expect(looselyParseAmount('-3')).toBe(-3);
    expect(looselyParseAmount('-3.45')).toBe(-3.45);
    expect(looselyParseAmount('-3,45')).toBe(-3.45);
    // Unicode minus
    expect(looselyParseAmount('−3')).toBe(-3);
    expect(looselyParseAmount('−3.45')).toBe(-3.45);
    expect(looselyParseAmount('−3,45')).toBe(-3.45);
  });

  test('looseParseAmount works with parentheses (negative)', () => {
    expect(looselyParseAmount('(3.45)')).toBe(-3.45);
    expect(looselyParseAmount('(3)')).toBe(-3);
    // Parentheses with Unicode minus
    expect(looselyParseAmount('(−3.45)')).toBe(-3.45);
    expect(looselyParseAmount('(−3)')).toBe(-3);
  });

  test('looseParseAmount ignores non-numeric characters', () => {
    // This is strange behavior because it does not work for just
    // `3_45_23` (it needs a decimal amount). This function should be
    // thought through more.
    expect(looselyParseAmount('3_45_23.10')).toBe(34523.1);
    expect(looselyParseAmount('(1 500.99)')).toBe(-1500.99);
  });

  test('number formatting works with comma-dot format', () => {
    setNumberFormat({ format: 'comma-dot', hideFraction: false });
    let formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234.56'))).toBe('1,234.56');

    setNumberFormat({ format: 'comma-dot', hideFraction: true });
    formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234.56'))).toBe('1,235');
  });

  test('number formatting works with comma-dot-in format', () => {
    setNumberFormat({ format: 'comma-dot-in', hideFraction: false });
    let formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234567.89'))).toBe('12,34,567.89');

    setNumberFormat({ format: 'comma-dot-in', hideFraction: true });
    formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234567.89'))).toBe('12,34,568');
  });

  test('number formatting works with dot-comma format', () => {
    setNumberFormat({ format: 'dot-comma', hideFraction: false });
    let formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234.56'))).toBe('1.234,56');

    setNumberFormat({ format: 'dot-comma', hideFraction: true });
    formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234.56'))).toBe('1.235');
  });

  test('number formatting works with space-comma format', () => {
    setNumberFormat({ format: 'space-comma', hideFraction: false });
    let formatter = getNumberFormat().formatter;
    // grouping separator space char is a narrow non-breaking space (U+202F)
    expect(formatter.format(Number('1234.56'))).toBe('1\u202F234,56');

    setNumberFormat({ format: 'space-comma', hideFraction: true });
    formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234.56'))).toBe('1\u202F235');
  });

  test('number formatting works with apostrophe-dot format', () => {
    setNumberFormat({ format: 'apostrophe-dot', hideFraction: false });
    let formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234.56'))).toBe(`1\u2019234.56`);

    setNumberFormat({ format: 'apostrophe-dot', hideFraction: true });
    formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('1234.56'))).toBe(`1\u2019235`);
  });

  test('number formatting works with small negative numbers with 0 decimal places', () => {
    setNumberFormat({ format: 'comma-dot', hideFraction: true });
    const formatter = getNumberFormat().formatter;
    expect(formatter.format(Number('-0.1'))).toBe('0');
    expect(formatter.format(Number('-0.5'))).toBe('-1');
    expect(formatter.format(Number('-0.9'))).toBe('-1');
    expect(formatter.format(Number('-1.2'))).toBe('-1');
  });

  test('currencyToAmount works with basic numbers', () => {
    expect(currencyToAmount('3')).toBe(3);
    expect(currencyToAmount('3.4')).toBe(3.4);
    expect(currencyToAmount('3.45')).toBe(3.45);
    expect(currencyToAmount('3.45060')).toBe(3.4506);
  });

  test('currencyToAmount works with varied formats', () => {
    setNumberFormat({ format: 'comma-dot', hideFraction: true });
    expect(currencyToAmount('3,45')).toBe(3.45);
    expect(currencyToAmount('3,456')).toBe(3456);
    expect(currencyToAmount('3,45000')).toBe(345000);
    expect(currencyToAmount("3'456.78")).toBe(3456.78);
    expect(currencyToAmount("3'456.78000")).toBe(3456.78);
    expect(currencyToAmount('1,00,000.99')).toBe(100000.99);
    expect(currencyToAmount('1,00,000.99000')).toBe(100000.99);
  });

  test('currencyToAmount works with leading decimal characters', () => {
    expect(currencyToAmount('.45')).toBe(0.45);
    expect(currencyToAmount(',45')).toBe(0.45);
  });

  test('currencyToAmount works with negative numbers', () => {
    expect(currencyToAmount('-3')).toBe(-3);
    expect(currencyToAmount('-3.45')).toBe(-3.45);
    expect(currencyToAmount('-3,45')).toBe(-3.45);
    // Unicode minus
    expect(currencyToAmount('−3')).toBe(-3);
    expect(currencyToAmount('−3.45')).toBe(-3.45);
    expect(currencyToAmount('−3,45')).toBe(-3.45);
  });

  test('currencyToAmount works with non-fractional numbers', () => {
    setNumberFormat({ format: 'comma-dot', hideFraction: false });
    expect(currencyToAmount('3.')).toBe(3);
    expect(currencyToAmount('3,')).toBe(3);
    expect(currencyToAmount('3,000')).toBe(3000);
    expect(currencyToAmount('3,000.')).toBe(3000);
  });

  test('currencyToAmount works with hidden fractions', () => {
    setNumberFormat({ format: 'comma-dot', hideFraction: true });
    expect(currencyToAmount('3.45')).toBe(3.45);
    expect(currencyToAmount('3.456')).toBe(3.456);
    expect(currencyToAmount('3.4500')).toBe(3.45);
    expect(currencyToAmount('3.')).toBe(3);
    expect(currencyToAmount('3,')).toBe(3);
    expect(currencyToAmount('3,000')).toBe(3000);
    expect(currencyToAmount('3,000.')).toBe(3000);
  });

  test('currencyToAmount works with apostrophe-dot format', () => {
    setNumberFormat({ format: 'apostrophe-dot', hideFraction: false });

    // Test with regular apostrophe (U+0027) - what users type on keyboard
    const keyboardApostrophe = '12\u0027345.67';
    expect(keyboardApostrophe.charCodeAt(2)).toBe(0x0027); // Verify it's U+0027
    expect(currencyToAmount(keyboardApostrophe)).toBe(12345.67);
    expect(currencyToAmount('1\u0027234.56')).toBe(1234.56);
    expect(currencyToAmount('1\u0027000.33')).toBe(1000.33);
    expect(currencyToAmount('100\u0027000.99')).toBe(100000.99);
    expect(currencyToAmount('1\u0027000\u0027000.50')).toBe(1000000.5);

    // Test with right single quotation mark (U+2019) - what Intl.NumberFormat outputs
    const intlApostrophe = '12\u2019345.67';
    expect(intlApostrophe.charCodeAt(2)).toBe(0x2019); // Verify it's U+2019
    expect(currencyToAmount(intlApostrophe)).toBe(12345.67);
    expect(currencyToAmount('1\u2019234.56')).toBe(1234.56);
    expect(currencyToAmount('1\u2019000.33')).toBe(1000.33);
  });

  test('currencyToAmount works with dot-comma', () => {
    setNumberFormat({ format: 'dot-comma', hideFraction: false });
    expect(currencyToAmount('3,45')).toBe(3.45);
    expect(currencyToAmount('3,456')).toBe(3.456);
    expect(currencyToAmount('3,4500')).toBe(3.45);
    expect(currencyToAmount('3,')).toBe(3);
    expect(currencyToAmount('3.')).toBe(3);
    expect(currencyToAmount('3.000')).toBe(3000);
    expect(currencyToAmount('3.000,')).toBe(3000);
  });

  test('titleFirst works with all inputs', () => {
    expect(titleFirst('')).toBe('');
    expect(titleFirst(undefined)).toBe('');
    expect(titleFirst(null)).toBe('');
    expect(titleFirst('a')).toBe('A');
    expect(titleFirst('abc')).toBe('Abc');
  });

  test('stringToInteger works with negative numbers', () => {
    expect(stringToInteger('-3')).toBe(-3);
    // Unicode minus
    expect(stringToInteger('−3')).toBe(-3);
  });
});