'use strict';

const CdbRequest = require('../../models/cartodb-request');

module.exports = function user (metadataBackend) {
    const cdbRequest = new CdbRequest();

    return function userMiddleware (req, res, next) {
        res.locals.user = getUserNameFromRequest(req, cdbRequest);

        getUserId(metadataBackend, res.locals.user, function (err, userId) {
            if (err || !userId) {
                const error = new Error('Unauthorized');
                error.type = 'auth';
                error.subtype = 'user-not-found';
                error.http_status = 404;
                error.message = errorUserNotFoundMessageTemplate(res.locals.user);
                next(error);
            }

            res.locals.userId = userId;
            return next();
        });
    };
};

function getUserNameFromRequest (req, cdbRequest) {
    return cdbRequest.userByReq(req);
}

function getUserId (metadataBackend, userName, callback) {
    metadataBackend.getUserId(userName, function (err, userId) {
        if (err) {
            return callback(err);
        }
        return callback(null, userId);
    });
}

function errorUserNotFoundMessageTemplate (user) {
    return `Sorry, we can't find CARTO user '${user}'. Please check that you have entered the correct domain.`;
}