util.js

var util = {};

util.parseError = function(errors){
	var parsed = {};
	if (errors.name == 'ValidationError'){
		for (var name in errors.errors){
			var validationError = errors.errors[name];
			parsed[name] = {message:validationError.message};
		}
	} else if (errors.code == '11000' && errors.errmsg.indexOf('username') > 0){
		parsed.username = {message:'This username already exists!'};
	} else {
		parsed.unhandled = JSON.stringify(errors);
	}
	return parsed;
}

// 
util.isLoggedin = function(req, res, next){
	if (req.isAuthenticated()){
		next();
	} else {
		req.flash('errors', {login:'Please login first'});
		res.redirect('/login');
	}
}

util.noPermission = function(req, res){
	req.flash('errors', {login:"You don't have permission"});
	req.logout();
	res.redirect('/login');
}

util.getPostQueryString = function(req, res, next){
	res.locals.getPostQueryString = function(isAppended=false, overwrites={}){    
	  var queryString = '';
	  var queryArray = [];
	  var page = overwrites.page?overwrites.page:(req.query.page?req.query.page:'');
	  var limit = overwrites.limit?overwrites.limit:(req.query.limit?req.query.limit:'');
	  var searchType = overwrites.searchType?overwrites.searchType:(req.query.searchType?req.query.searchType:'');
	  var searchText = overwrites.searchText?overwrites.searchText:(req.query.searchText?req.query.searchText:'');
  
	  if(page) queryArray.push('page='+page);
	  if(limit) queryArray.push('limit='+limit);
	  if(searchType) queryArray.push('searchType='+searchType);
	  if(searchText) queryArray.push('searchText='+searchText);
  
	  if(queryArray.length>0) queryString = (isAppended?'&':'?') + queryArray.join('&');
  
	  return queryString;
	}
	next();
}

util.convertToTrees = function(array, idFieldName, parentIdFieldName, childrenFieldName) {
	var cloned = array.slice();

	for (var i=cloned.length-1;i>-1;i--){
		var parentId = cloned[i][parentIdFieldName];

		if(parentId){
			var filtered = array.filter(function(elem){
				return elem[idFieldName].toString() == parentId.toString();
			});

			if(filtered.length){
				var parent = filtered[0];

				if (parent[childrenFieldName]){
					parent[childrenFieldName].unshift(cloned[i]);
				}
				else {
					parent[childrenFieldName] = [cloned[i]];
				}
			}
			cloned.splice(i, 1);
		}
	}
	
	return cloned;
}

module.exports = util;