let url = require('url');
let md5 = require('md5');

module.exports = function(app) {
    let User = app.models.User;
    let applications = app.get('applications');

    app.get('/auth/', function(req, res) {
        res.render('auth.ejs', {
            assets: app.getWpAssets('auth')
        });
    });

    app.post('/auth/login', function(req, res) {
        let body = req.body;
        let user = body.user;
        let password = body.password;
        let syncOnFail = true;
        let usesEmail = user && user.indexOf('@') !== -1;

        login();

        function login() {
            let loginInfo = {password: password};

            if (usesEmail)
                loginInfo.email = user;
            else
                loginInfo.username = user;

            User.login(loginInfo, 'user', loginCb);
        }
        function loginCb(err, token) {
            if (err) {
                if (syncOnFail && !usesEmail) {
                    syncOnFail = false;
                    let filter = {where: {name: user}};
                    app.models.Account.findOne(filter, findCb);
                } else
                    badLogin();
                return;
            }

            let apiKey;
            let continueUrl;

            try {
                let query = url.parse(req.body.location, true).query;
                apiKey = query.apiKey;
                continueUrl = query.continue;
            } catch (e) {
                continueUrl = null;
            }

            if (!apiKey) apiKey = 'default';
            let loginUrl = applications[apiKey] || '/login';

            res.json({
                token: token.id,
                continue: continueUrl,
                loginUrl: loginUrl
            });
        }
        function findCb(err, instance) {
            if (err || !instance || instance.password !== md5(password)) {
                badLogin();
                return;
            }

            let where = {id: instance.id};
            let userData = {
                id: instance.id,
                username: user,
                password: password,
                email: instance.email,
                created: instance.created,
                updated: instance.updated
            };
            User.upsertWithWhere(where, userData, login);
        }
        function badLogin() {
            res.status(401);
            res.json({
                message: 'Login failed'
            });
        }
    });

    app.get('/auth/logout', function(req, res) {
        User.logout(req.accessToken.id, () => {
            res.redirect('/');
        });
    });
};