import { fontMetricsOf, heightMm, pdfTextMeasurer } from './font-metrics';
import { LabelTextElement } from './label-element.types';

describe('font metrics', () => {
  // Guards against a pdfkit update that changes or hides the AFM values.
  it('Helvetica metrics are x-height 523 and cap height 718', () => {
    expect(fontMetricsOf('sans', false, false)).toEqual({
      xHeight: 523,
      capHeight: 718,
    });
  });

  it('Times and Courier return their own AFM values', () => {
    expect(fontMetricsOf('serif', false, false)).toEqual({
      xHeight: 450,
      capHeight: 662,
    });
    expect(fontMetricsOf('serif', true, true)).toEqual({
      xHeight: 462,
      capHeight: 669,
    });
    expect(fontMetricsOf('mono', false, false)).toEqual({
      xHeight: 426,
      capHeight: 562,
    });
  });

  it('reads the style variants of a family', () => {
    expect(fontMetricsOf('sans', true, false).xHeight).toBe(532);
  });

  it('converts a size and a metric to millimetres', () => {
    expect(heightMm(6, 523)).toBeCloseTo(1.107, 3);
    expect(heightMm(7, 523)).toBeCloseTo(1.2915, 3);
    expect(heightMm(72, 1000)).toBeCloseTo(25.4, 9);
  });

  describe('pdfTextMeasurer', () => {
    const element: LabelTextElement = {
      id: 'e',
      type: 'text',
      x: 0,
      y: 0,
      width: 20,
      height: 10,
      text: '',
      fontSize: 10,
      fontFamily: 'sans',
      bold: false,
      italic: false,
      color: '#000000',
      align: 'left',
    };

    it('measures more lines for a narrower box', () => {
      const measurer = pdfTextMeasurer();
      const text = 'Mindestens haltbar bis 05.03.2028 und noch mehr Text';
      const wide = measurer.heightOfStringPt(text, { ...element, width: 120 });
      const narrow = measurer.heightOfStringPt(text, { ...element, width: 20 });
      expect(narrow).toBeGreaterThan(wide);
    });

    it('measures nothing for an empty text', () => {
      expect(pdfTextMeasurer().heightOfStringPt('', element)).toBe(0);
    });
  });
});