YouTransfer/YouTransfer

'use strict';

// ------------------------------------------------------------------------------------------ Dependencies

var _ = require('lodash');

// ------------------------------------------------------------------------------------------ Module Exposure

module.exports = function(req, res, next) {
    req.errors = new Errors();
    next();
};

// ------------------------------------------------------------------------------------------ Module Definition

function Errors() {

    this.registered = [];
    this.errors = [];

}

Errors.prototype.register = function(error, code) {
    var self = this;

    if(_.isArray(error)) {
        _.each(Object.keys(error), function(key) {
            var item = error[key];
            var err = new Error();

            if(_.isError(item)) {
                err = item;
            } else if(_.isObject(item)) {
                err = _.assign(err, item);
            } else {
                throw new Error('Invalid argument exception');
            }

            err.code = item.code || (_.isNaN(parseInt(key)) ? key : 'default');
            self.registered[err.code] = err;
        });
    } else {
        if(_.isError(error)) {
            error = _.assign(error, {
                code: code || (error.code ? error.code : 'default')
            });
        } else if(_.isObject(error)) {
            error = _.assign(new Error(), error, {
                code: code || (error.code ? error.code : 'default')
            });
        } else {
            throw new Error('Invalid argument exception');
        }

        self.registered[error.code] = error;
    }

    return true;
};

Errors.prototype.parse = function(err) {
    if(err) {
        var error = (this.registered[err.code] || 
                     this.registered[err.message]) || 
                     this.registered['default'];
                     
        if(!error) {
            error = err;
        } else {
            error.original = err;
        }
        this.errors.push(error);
    }
    return true;
};

Errors.prototype.get = function() {
    var result = this.errors;
    this.reset();
    return result;
};

Errors.prototype.purge = function() {
    this.registered = [];
};

Errors.prototype.reset = function() {
    this.purge();
    this.errors = [];
};

Errors.prototype.exist = function() {
    return this.errors.length > 0;
};

Errors.prototype.custom = function(code, message) {
    var error = new Error(message);
    error.code = code;
    return error;
};