#!/usr/bin/env node

/*! Copyright Twitter Inc. and other contributors. Licensed under MIT *//*
    https://github.com/twitter/twemoji/blob/gh-pages/LICENSE
*/

const fs = require('fs');
const path = require('path');
const { spawnSync } = require('child_process');

function file(...which) {
  return path.join(__dirname, '..', ...which);
}

fs.writeFileSync(
  file('twemoji.npm.js'),
  [
    'var location = global.location || {};',
    fs.readFileSync(file('twemoji.js')),
    'if (!location.protocol) {',
    '  twemoji.base = twemoji.base.replace(/^http:/, "");',
    '}',
    'module.exports = twemoji;'
  ].join('\n')
);

fs.writeFileSync(
  file('twemoji.amd.js'),
  'define(function () {\n' +
    fs.readFileSync(file('twemoji.js')).toString().replace(
      /^(.)/gm, '  $1'
    ) +
  '\n  return twemoji;\n});'
);

spawnSync(
  'yarnpkg',
  [
    'uglifyjs',
    '--verbose',
    file('twemoji.js'),
    '-o',
    file('twemoji.tmp.js')
  ]
);

fs.writeFileSync(
  file('twemoji.min.js'),
  '/*! Copyright Twitter Inc. and other contributors. Licensed under MIT */\n' +
  fs.readFileSync(file('twemoji.tmp.js'))
);
fs.unlinkSync(file('twemoji.tmp.js'));

const algorithm = 'sha384';
const digest = spawnSync('openssl', ['dgst', `-${algorithm}`, '-binary', file('twemoji.min.js')]);
if (digest.status || digest.signal){
  throw new Error(digest.stderr.toString('utf8'));
}
const integrity = `integrity="${algorithm}-${digest.stdout.toString('base64')}"`;

function updateIntegrity(filename) {
  fs.writeFileSync(
    filename,
    fs.readFileSync(filename).toString('utf8').replace(/integrity="[^ ]*"/, integrity));
}

updateIntegrity(file('..', 'README.md'));
updateIntegrity(file('templates', 'preview.html'));