app.post('/api/register', function(req, res) {
		console.log("Registering...");
		// Helper function: Returns "" if the username is valid, an error message
		// otherwise.

		var validateUsername = function(username) {
			username = username.trim();
			if (!username) {
				return "Username: A username is required.";
			}
			if (username.length < 5) {
				return "Username: Username must be at least 5 characters long.";
			}
			if (!/^[a-zA-Z0-9]+$/i.test(username)) {
				return "Username: Username must be alphanumeric.";
			}
			//Username check will happen separately, since it involves a callback.
			return "";
		}

		// Similarly, returns an error string if there's a problem, otherwise
		// returns ""
		var validatePassword = function(password) {
			if (password == null)
				return "Password: A Password is required.";
			if (password.length < 10)
				return "Password: Password must be at least 10 characters long.";
			return "";
		}

		var validateName = function(name) {
			if (name == null) {
				return "Name: Names are required.";
			}
			if (!/^[a-zA-Z]+$/.test(name)) {
				return "Name: Name is not alphabetical.";
			}
			return "";
		}

		var validateDigits = function(uid, digitCount) {
			if (uid == null) {
				return "";
			}
			if (uid.length != digitCount) {
				return "UID or Phone Number: Incorrect digit count.";
			}
			if (!/^[0-9]+$/.test(uid)) {
				return "UID or Phone Number: Not Digit String";
			}
			return "";
		}

		var validateGradYear = function(gradYear) {
			if (gradYear == null) {
				return "";
			}
			if (parseInt(gradYear) == NaN || parseInt(gradYear) < 0) {
				return "GradYear: Not a valid input."
			}
			return "";
		}

		var validateEmail = function(email) {
			if (email == null) {
				return "Email: Email is required.";
			}
			var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
			if (!re.test(email)) {
				return "Email: Email is invalid.";
			}
			return "";
		}

		var validateInterests = function(interests) {
			var validInterests = ["dota2", "smash4", "melee", "csgo", "league", "overwatch", "hearthstone"];
			for (var i = 0; i < interests.length; i++) {
				if (!validInterests.includes(interests[i])) {
					return "Interests: Invalid interest.";
				}
				return "";
			}
		}

		var errorValidate = function(error) {
			if (error != "") {
				res.send({ error: error });
			}
			return;
		}

		var username = req.body.username.trim();
		errorValidate(validateUsername(username));

		var usernameLower = username.toLowerCase();

		var password = req.body.password;
		errorValidate(validatePassword(password));

		var firstName = req.body.firstName.trim();
		errorValidate(validateName(firstName));

		var lastName = req.body.lastName.trim();
		errorValidate(validateName(lastName));

		var uid = req.body.uid;
		errorValidate(validateDigits(uid, 9));

		var gradYear = req.body.gradYear;
		errorValidate(validateGradYear(gradYear));

		var phoneNumber = req.body.phoneNumber;
		errorValidate(validateDigits(phoneNumber, 10));

		var email = req.body.email;
		errorValidate(validateEmail(email));

		var interests = req.body.interests;
		errorValidate(validateInterests(interests));

		console.log("Input valid...");

		User.findOne({ usernameLower: usernameLower }, function(err, user) {
			if (err) {
				console.log(err);
				return res.send({ error: err });
			}
			if (user != null) {
				console.log(user);
				// Username exists, block it
				return res.send({ error: "Username: Username is already taken." });
			}
			else {
				console.log("Registration okay to go, starting");
				// Add the account.
				var user = new User({
				// console.log({
					username: username,
					usernameLower: usernameLower,
					permissions: "user",
					firstName: firstName,
					lastName: lastName,
					email: email,
					gradYear: gradYear,
					UID: uid,
					phoneNumber: phoneNumber,
					interests: interests
				});
				user.password = user.generateHash(password);
				user.save();
				// setLogin(res, username, password);
				res.cookie('username', username, { signed: true });
				res.cookie('password', auth.encrypt(password), { signed: true });
				console.log("Done with cookie");
				res.send({ status: "done" });
				console.log("Super done");
			}
		});
	});