/* eslint-disable @typescript-eslint/no-var-requires */
const { minify } = require('terser');
const { readFile, readdir, writeFile, stat, mkdir, rm } = require('fs');
const { resolve, sep, dirname } = require('path');

const walk = function(dir, done) {
	let results = [];
	readdir(dir, function(err, list) {
		if(err) return done(err);
		let pending = list.length;
		if(!pending) return done(null, results);
		list.forEach(function(file) {
			file = resolve(dir, file);
			stat(file, function(err, stat) {
				if(stat && stat.isDirectory()) {
					walk(file, function(err, res) {
						results = results.concat(res);
						if(!--pending) done(null, results);
					});
				} else {
					results.push(file);
					if(!--pending) done(null, results);
				}
			});
		});
	});
};

walk('dist', (err, files) => {
	if(err) throw err;

	files.forEach((file) => {
		if(file.endsWith('js')) {
			readFile(file, async (err, fileBuf) => {
				if(err) throw err;

				const minifyCode = (await minify(fileBuf.toString('utf8'), { ecma: 5, compress: true, mangle: false })).code;

				writeFile(file, minifyCode, { encoding: 'utf8' }, (err) => {
					if(err && err.message.includes('ENOENT')) {
						mkdir(`dist/${dirname(file).split(sep).pop()}`, (err) => {
							if(err) throw err;
						});

						writeFile(file, minifyCode, { encoding: 'utf8' }, (err) => {
							if(err) throw err;
						});
					} else if(err) {
						throw err;
					}
				});
			});
		}
	});
});