const config = require('./config.json');
const fonts = config.fonts;
const texts = config.texts;

const path = require('path');
const opentype = require('opentype.js');

const glyphs = [...new Set(texts.split(''))].join('');

fonts.forEach(item => {
    const font = opentype.loadSync(item);
    const postScriptName = font.getEnglishName('postScriptName');
    const dist = path.join(
        'dist',
        postScriptName.replace(/-/g, '_').toLowerCase() + '_subset.otf'
    );
    const [familyName, styleName] = postScriptName.split('-');
    
    const notdefGlyph = font.glyphs.get(0);
    notdefGlyph.name = '.notdef';
    subGlyphs = [notdefGlyph].concat(font.stringToGlyphs(glyphs));
    
    const subsetFont = new opentype.Font({
        familyName: familyName,
        styleName: styleName,
        unitsPerEm: font.unitsPerEm,
        ascender: font.ascender,
        descender: font.descender,
        designer: font.getEnglishName('designer'),
        designerURL: font.getEnglishName('designerURL'),
        manufacturer: font.getEnglishName('manufacturer'),
        manufacturerURL: font.getEnglishName('manufacturerURL'),
        license: font.getEnglishName('license'),
        licenseURL: font.getEnglishName('licenseURL'),
        version: font.getEnglishName('version'),
        description: font.getEnglishName('description'),
        copyright: 'This is a subset font of ' + postScriptName + '. ' + font.getEnglishName('copyright'),
        trademark: font.getEnglishName('trademark'),
        glyphs: subGlyphs
    });

    subsetFont.download(dist);
});