var fs = require('fs');
var path = require('path');
var crypto = require('crypto');

var manifest = {
	packageUrl: 'http://localhost/tutorial-hot-update/remote-assets/',
	remoteManifestUrl: 'http://localhost/tutorial-hot-update/remote-assets/project.manifest',
	remoteVersionUrl: 'http://localhost/tutorial-hot-update/remote-assets/version.manifest',
	version: '1.0.0',
	assets: {},
	searchPaths: []
};

var dest = './remote-assets/';
var src = './jsb/';

// Parse arguments
var i = 2;
while (i < process.argv.length) {
	var arg = process.argv[i];

	switch (arg) {
		case '--url':
		case '-u':
			var url = process.argv[i + 1];
			manifest.packageUrl = url;
			manifest.remoteManifestUrl = url + 'project.manifest';
			manifest.remoteVersionUrl = url + 'version.manifest';
			i += 2;
			break;
		case '--version':
		case '-v':
			manifest.version = process.argv[i + 1];
			i += 2;
			break;
		case '--src':
		case '-s':
			src = process.argv[i + 1];
			i += 2;
			break;
		case '--dest':
		case '-d':
			dest = process.argv[i + 1];
			i += 2;
			break;
		default:
			i++;
			break;
	}
}


function readDir(dir, obj) {
	var stat = fs.statSync(dir);
	if (!stat.isDirectory()) {
		return;
	}
	var subpaths = fs.readdirSync(dir), subpath, size, md5, compressed, relative;
	for (var i = 0; i < subpaths.length; ++i) {
		if (subpaths[i][0] === '.') {
			continue;
		}
		subpath = path.join(dir, subpaths[i]);
		stat = fs.statSync(subpath);
		if (stat.isDirectory()) {
			readDir(subpath, obj);
		}
		else if (stat.isFile()) {
			// Size in Bytes
			size = stat['size'];
			md5 = crypto.createHash('md5').update(fs.readFileSync(subpath, 'binary')).digest('hex');
			compressed = path.extname(subpath).toLowerCase() === '.zip';

			relative = path.relative(src, subpath);
			relative = relative.replace(/\\/g, '/');
			relative = encodeURI(relative);
			obj[relative] = {
				'size': size,
				'md5': md5
			};
			if (compressed) {
				obj[relative].compressed = true;
			}
		}
	}
}

var mkdirSync = function (path) {
	try {
		fs.mkdirSync(path);
	} catch (e) {
		if (e.code != 'EEXIST') throw e;
	}
}

// Iterate res and src folder
readDir(path.join(src, 'src'), manifest.assets);
readDir(path.join(src, 'assets'), manifest.assets);

var destManifest = path.join(dest, 'project.manifest');
var destVersion = path.join(dest, 'version.manifest');

mkdirSync(dest);

fs.writeFile(destManifest, JSON.stringify(manifest), (err) => {
	if (err) throw err;
	console.log('Manifest successfully generated');
});

delete manifest.assets;
delete manifest.searchPaths;
fs.writeFile(destVersion, JSON.stringify(manifest), (err) => {
	if (err) throw err;
	console.log('Version successfully generated');
});