var uuid = require('node-uuid');

var pb = require('../lib/pb');
var PBException = require('../lib/pb-helpers').PBException;
var utils = require('../lib/utils');


module.exports.signup = function *(session, userID, envelope) {
    var command = envelope.userSignupRequest;

    var password = command.password;
    if (!password || password.length < 6) {
        throw new PBException(pb.PBError.ErrorType.INVALID_PASSWORD);
    }

    var email = command.email;
    if (!email) {
        throw new PBException(pb.PBError.ErrorType.INVALID_EMAIL);
    }

    var user = yield session.db.users.findOne({ email: email });
    if (user) {
        throw new PBException(pb.PBError.ErrorType.UNAVAILABLE_EMAIL);
    }

    user = yield session.db.users.insert({
        email: email,
        fname: command.fname,
        lname: command.lname,
        password: utils.sha256(password),
        type: pb.PBUser.UserType.BIDDER
    });

    var userSession = yield session.db.sessions.insert({
        userID: user._id,
        authToken: uuid.v4()
    });

    return new pb.PBCommandEnvelope({
        type: pb.PBCommandEnvelope.CommandType.USER_SIGNUP_RESPONSE,
        userSignupResponse: {
            user: { userID: user._id.toString() },
            session: {
                sessionID: userSession._id.toString(),
                authToken: userSession.authToken
            },
            email: email
        }
    });
};

module.exports.login = function *(session, userID, envelope) {
    var command = envelope.userLoginRequest;

    var email = command.email;
    if (!email) {
        throw new PBException(pb.PBError.ErrorType.INVALID_EMAIL);
    }

    var user = yield session.db.users.findOne({ email: email });
    if (!user) {
        throw new PBException(pb.PBError.ErrorType.NOT_FOUND);
    }

    if (utils.sha256(command.password || '') !== user.password) {
        throw new PBException(pb.PBError.ErrorType.UNAUTHORIZED);
    }

    var userSession = yield session.db.sessions.insert({
        userID: user._id,
        authToken: uuid.v4()
    });

    return new pb.PBCommandEnvelope({
        type: pb.PBCommandEnvelope.CommandType.USER_LOGIN_RESPONSE,
        userLoginResponse: {
            user: {
                email: user.email,
                userID: user._id.toString(),
                fname: user.fname || null,
                lname: user.lname || null
            },
            session: {
                sessionID: userSession._id.toString(),
                authToken: userSession.authToken
            },
            email: user.email
        }
    });
};