import fs from "fs";

import { FontIo, Ot } from "ot-builder";

export async function readTTF(input) {
	const buf = await fs.promises.readFile(input);
	return parseTTF(buf);
}

export function parseTTF(buf) {
	const sfnt = FontIo.readSfntOtf(buf);
	const font = FontIo.readFont(sfnt, Ot.ListGlyphStoreFactory);
	return font;
}

export function buildTTF(font) {
	const sfnt = FontIo.writeFont(font, {
		glyphStore: { statOs2XAvgCharWidth: false },
		generateDummyDigitalSignature: true
	});
	const buf = FontIo.writeSfntOtf(sfnt);
	return buf;
}

export async function saveTTF(output, font) {
	await fs.promises.writeFile(output, buildTTF(font));
}