diff --git a/src/main.js b/src/main.js
new file mode 100644
index 0000000..d886290
--- /dev/null
+++ b/src/main.js
@@ -0,0 +1,127 @@
+const { http, https } = require('follow-redirects');
+const jsonMinify = require("node-json-minify");
+const fs = require("fs");
+let dep = new Map();
+let config;
+let downloadStarted = false;
+switch(process.argv.length) {
+	case 3:
+		process.chdir(process.argv[2]);
+	case 2:
+		config = JSON.parse(jsonMinify(fs.readFileSync("mods.json", "utf-8")));
+		break;
+	default:
+		throw "unexpected argument";
+}
+config.mods.curse.forEach(mod => {
+	getData(`search?categoryId=0&gameId=432&gameVersion=${encodeURI(config.gameVersion)}&index=0&pageSize=15&searchFilter=${encodeURI(mod)}&sectionId=6&sort=2`, (result) => { // resolve projectID
+		resolveDep(result[0].id, function(){
+			for(const modFile of dep) {
+				if(mods_lock !== undefined) downloadMods();
+				let waitModsLock = setInterval(function() {
+					if(mods_lock !== undefined) {
+						clearInterval(waitModsLock);
+						downloadMods();
+					}
+				}, 1);
+			}
+		});
+	});
+});
+let mods_lock;
+fs.readFile("mods-lock.json", "utf-8", (err, data) => {
+	if(err) {
+		if(err.errno == -2) mods_lock = new Map();
+		else throw err;
+	}
+	else mods_lock = new Map(Objects.entries(JSON.parse(data)));
+});
+
+var resolveDepRecursionCount = [];
+function resolveDep(modId, callback, index) {
+	if(index === undefined) index = resolveDepRecursionCount.push(0) - 1;
+	++resolveDepRecursionCount[index];
+	getData(`${modId}/files`, (files) => {
+		let rightVersion;
+		for(let i = files.length - 1; i >= 0; --i) {
+			let versionArray = files[i].gameVersion;
+			if(versionMatch(versionArray, config.gameVersion) && (versionMatch(versionArray, config.modloader) || modloaderMatch(versionArray, config.modloader))) {
+				rightVersion = files[i];
+				dep.set(modId, {fileId: rightVersion.id, url: rightVersion.downloadUrl});
+			}
+		}
+		rightVersion.dependencies.forEach(mod => {
+			resolveDep(mod.addonId, callback, index);
+		});
+		--resolveDepRecursionCount[index];
+		if(resolveDepRecursionCount[index] == 0) callback();
+	});
+}
+
+function getData(url, callback) {
+	https.get(`https://addons-ecs.forgesvc.net/api/v2/addon/${url}`, (resp) => {
+		let data = '';
+		resp.on('data', (chunk) => {
+			data += chunk;
+		});
+		resp.on("end", () => {
+			callback(JSON.parse(data));
+		});
+	});
+}
+
+function versionMatch(versionArray, gameVersion) {
+	let gameVersionMatch = false;
+	versionArray.forEach(version => {
+		gameVersionMatch = gameVersionMatch || version == gameVersion;
+	});
+	return gameVersionMatch;
+}
+
+function modloaderMatch(versionArray, modloaderVersion) {
+	versionArray.forEach(version => {
+		if(/^[a-zA-Z]+$/.test(version) && version != modloaderVersion) return false;
+		return true;
+	});
+}
+
+function downloadMods() {
+	if(!downloadStarted) {
+		downloadStarted = true;
+		dep.forEach((mod, modId) => {
+			if(mods_lock.has(modId)) {
+				console.log(3)
+				if(mods_lock.get(mod.fileId) === mod.fileId) return;
+				fs.unlink(modId + " " + mods_lock.get(mod.fileId + ".jar"));
+			}
+			downloadFile(mod.url, "mods/" + modId + " " + mod.fileId + ".jar");
+		});
+	}
+}
+
+function downloadFile(url, dest) {
+	let file = fs.createWriteStream(dest);
+	console.log(url);
+	let request = https.get(url, (response) => {
+		// check if response is success
+		if (response.statusCode !== 200) {
+			throw response.statusCode;
+		}
+
+		response.pipe(file);
+	});
+
+	// close() is async, call cb after close completes
+	file.on('finish', () => file.close());
+
+	// check for request error too
+	request.on('error', (err) => {
+		fs.unlink(dest);
+		throw err;
+	});
+
+	file.on('error', (err) => { // Handle errors
+		fs.unlink(dest);
+		throw err;
+	});
+}