var glob = require('glob');
var fs = require('fs-extra');
var path = require('path');
var archiver = require('archiver');

let lang = process.argv[2];

if (lang == null)
{
	let baseName = path.basename(process.argv[1]);
	console.log(`Usage: ${baseName} language_code`);
	process.exit(1);
}

let nTasks;
let projectDir;

fs.remove(lang, () => {
	fs.realpath(`${__dirname}/..`, (err, realPath) => {
		projectDir = realPath;
		let len = projectDir.length + 1;
		
		glob(`${projectDir}/**/locale/`, (err, localeDirs) => {
			for (let localeDir of localeDirs) {
				localeDir = localeDir.substr(len)

				if (/^node_modules\//.test (localeDir))
					continue;

				exportLocale(localeDir);
			}

			nTasks = localeDirs.length;
		});
	});
});

function exportLocale (localeDir) {
	let dstDir = `${lang}/${localeDir}`;
	
	fs.mkdirp(dstDir, err => {
		if (err) {
			console.log(err);
			onTaskEnd();
			return;
		}

		let src, dst;
		
		src = `${projectDir}/${localeDir}/en.json`;
		dst = `${dstDir}/en.json`;
		fs.copy(src, dst, onTaskEnd);

		src = `${projectDir}/${localeDir}/${lang}.json`;
		dst = `${dstDir}/${lang}.json`;
		fs.copy(src, dst, onTaskEnd);

		nTasks += 2;
		onTaskEnd();
	});
}

let output;
let archive;

function onTaskEnd() {
	nTasks--;
	if (nTasks > 0) return;

	output = fs.createWriteStream(`${lang}.zip`);
	output.on ('close', onArchiveClose);

	archive = archiver('zip', {
		zlib: { level: 9 }
	});
	archive.on ('error', err => {
		throw err;
	});
	archive.pipe(output);
	archive.directory(lang);
	archive.finalize();
}

function onArchiveClose() {
	fs.remove(lang);
	console.log ('Export finalized!');
}