Parse.Cloud.define("getBestScores", function(request, response) {
    var bestQuery = new Parse.Query("HighScore");
    bestQuery.descending("score");
    bestQuery.limit(30);

    bestQuery.find({
        success: function(results) {
            var result = {};
            getPositionOfEmail(request.params.email, {
                success: function(before, score) {
                    if (before != null) {
                        result[(before.length + 1) + ";" + score] = results;
                        response.success(result);
                    } else {
                        result["0;-1"] = results;
                        response.success(result);
                    }
                },
                error: function(object, error) {
                    response.error(error);
                }
            });
        },
        error: function(object, error) {
            response.error(error);
        }
    });
});

function getPositionOfEmail(email, options) {
    var query = new Parse.Query("HighScore");
    query.equalTo("userEmail", email);
    query.find({
        success: function (results) {
            if (results != null) {
                var score = results[0].get("score");
                var scoreQuery = new Parse.Query("HighScore");
                scoreQuery.greaterThan("score", score);
                scoreQuery.find({
                    success: function(better) {
                        options.success(better, score);
                    },
                    error: function(object, error) {
                        options.error(object, error);
                    }
                });
            } else {
                options.success(null, 0);
            }
        },
        error: function(object, error) {
            options.error(object, error);
        }
    });
}