module.exports = function (app) {
    function toJson(object) {
        let json = {};

        for(let prop in object) {
            let value = object[prop];

            switch(typeof value) {
                case 'object':
                    if(value instanceof RegExp)
                        json[prop] = value.source;
                    break;
                case 'function':
                    json[prop] = value.toString();
                    break;
                default:
                    json[prop] = value;
            }
        }

        return json;
    }

    app.get('/validations', function (req, res) {
        let json = {};
        let models = app.models;

        for(let modelName in models) {
            let model = models[modelName];

            let validations = model.validations;
            let jsonValidations = {};

            for(let fieldName in validations) {
                let jsonField = [];

                for(let validation of validations[fieldName])
                    jsonField.push(toJson(validation));

                jsonValidations[fieldName] = jsonField;
            }

            json[modelName] = {
                properties: model.definition.rawProperties,
                validations: jsonValidations
            };
        }

        res.set('Content-Type', 'application/json');
        res.send(JSON.stringify(json));
    })
};