exports = module.exports = function loadModels(Y, models) {
    var NS = Y.namespace('TDP');
    return function(req, res, next) {
        var stack = new Y.Parallel(),
            oauth = req.session.oauth;

        if ( ! Y.Lang.isObject( req.models ) ) {
            req.models = { };
        }

        if ( !oauth ) {
            Y.log('No oauth in the session. You must define this first.', 'error');
            res.redirect('/login');
            return;
        }

        Y.Array.each( models, function(name) {
            // Assume this model is already loaded.
            if ( req.models[name] ) {
                return;
            }

            var model = new NS[name]();
            model.load(
                { headers : { 'X-Access-Token' : oauth.access_token } },
                stack.add( function(err) {
                    if ( err ) {
                        Y.log('Failed loading model ' + name + ' with error:');
                        Y.log(err);
                    } else {
                        Y.log('Setup a model successfully');
                        req.models[name] = model;
                    }
                })
            );
        });

        stack.done( function() { next(); } );
    };
};