/**
 * Prints the variable axes of the packaged Google Sans Flex subset.
 *
 * Run from the repository root with `node bin/check-font.mjs [woff2]`.
 * tests/Feature/FontTest.php runs it through the configured `node` binary and asserts the ranges
 * the CSS needs (wght, ROND — see that test for why), because PHP cannot open a woff2 without the
 * Brotli extension.
 *
 * Output is one JSON object on stdout — {file, postscriptName, numGlyphs, axes: {tag: {name, min,
 * default, max}}}. The exit status is 1, with the reason on stderr, only when the file itself
 * can't be opened.
 */
import { openSync } from 'fontkit'
import { fileURLToPath } from 'node:url'

const file = process.argv[2] ?? fileURLToPath(new URL('../resources/fonts/google-sans-flex/GoogleSansFlex-Latin.woff2', import.meta.url))

let font

try {
    font = openSync(file)
} catch (error) {
    process.stderr.write(`${file}: ${error.message}\n`)
    process.exit(1)
}

process.stdout.write(`${JSON.stringify({
    file,
    postscriptName: font.postscriptName,
    numGlyphs: font.numGlyphs,
    axes: font.variationAxes ?? {},
})}\n`)