var sys = require('sys'), posix = require('posix');

function requireDirAsync(dir) {
	var promise = new process.Promise();
	posix.readdir(dir).addCallback(function(files) {
		var numFiles = files.length;
		var result = {};

		files.forEach(function(filename) {
			var fullname = buildPath(dir, filename);
			var callback = function(obj) {
				result[filename] = obj;
				numFiles--;
				if(numFiles == 0) {
					promise.emitSuccess(result);
				}
			};

			posix.stat(fullname).addCallback(function(stat) {
				if(stat.isDirectory(fullname)) {
					requireDirAsync(fullname).addCallback(callback);
				} else if(isJSFile(filename)) {
					filename = removeExtension(filename);
					require.async(buildPath(dir, filename)).addCallback(callback);
				}
			});
		});
	});
	return promise;
};

this.requireDir = function(dir) {
	return requireDirAsync(dir).wait();
};
this.requireDir.async = requireDirAsync;

// utilities
function isJSFile(filename) {
	return filename.match(/\.js$/);
};

function buildPath(dir, file) {
	return dir + '/' + file;
};

function removeExtension(jsFilename) {
	return jsFilename.replace(/\.js$/, '');
};