var UAParser = require('ua-parser-js');
var parser = new UAParser();

module.exports = function(config, mongoose) {
	var Fingerprint = mongoose.model('Fingerprint');

	return function userAgent(req, res, next){
		var ua = req.get('user-agent');

		parser.setUA(ua);

		var uaParsed = _.omit(parser.getResult(), 'ua');
		var headers = _.omit(req.headers, [ 'cookie', 'user-agent' ]);

		if(!_.isEmpty(req.query))
			var ip = req.ip;

			Fingerprint.findById( req.query.id, function(err, fp) {
				if(err) return next(err);

				if(fp) {
					if(!_.find(fp.server, { ua: ua })) {
						var obj = {
							ip: ip,
							ua: ua,
							uaParsed: uaParsed,
							headers: headers
						};

						fp.server.push(obj);
					
						fp.save(function(err, fp) {
							if(err) console.error(err);
						});
					}
				}
			});


		res.locals = {
			ua: ua,
			uaParsed: uaParsed,
			headers: headers
		};

		next();
	};
};