utils.js

'use strict';

const UTILS = {

	Fn : {

			/**
			 * log messages and payloads (json)
			 * @param {string} msg - message of the log statement
			 * @param {object} data - javascript object or json string 
			 * @param {string} color - our color enum 
			 */
			log: function(msg, data, color){
				
				if (arguments.length === 3){

					// try parse to json
					if (typeof data === 'string' || data instanceof String){

					 	try {
					        data = JSON.parse(data);
					    } catch(e) {
					        console.warn("unable to parse " + data);
					    }

					}

					// change color and then restore it back
					console.log(color, msg, UTILS.Color.Default);
					console.log(data);

				}else if (arguments.length === 2){
					// HACK : data is actually color here
					console.log(data, msg, UTILS.Color.Default);

				}else {
					console.log(msg);
				}
        		
			},

			/** Logs data payload - consumes huge amount of IO */
			data: function (msg, data) {
				if (!UTILS.Logging.EnablePayloadLogging) return;
				UTILS.Fn.log(msg, data, UTILS.Color.Default);
			},

			/** Logs error */
			err: function(msg, err){
				UTILS.Fn.log(msg, UTILS.Color.BgRed);
				err && console.error(err);
			},

			/** Logs error that should not interfere with process */
			warn: function(msg){
				UTILS.Fn.log(msg, UTILS.Color.Yellow);
			},

			/** Lifecycle event */
			lifecyc: function(msg){
				UTILS.Fn.log(msg, UTILS.Color.Magenta);
			},

			/** Create GUID to uniquely identify client */
			uuidv4 : function(){
				return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
				    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
				    return v.toString(16);
			  	});
			}

	},

	Logging : {
		/** Very verbose logging of data exchange  */
		EnablePayloadLogging : undefined, // must be set by calling app
		
		/** log connection establishement and ping pong */
		EnableLifecycleLogging : undefined // must be set by calling app
	},

	/** call direction in ocpp messages */
	OcppCallType : {
		'ClientToServer' : 2,
		'ServerToClient' : 3
	},

	Color : {

		Default : '\x1b[0m',

		Black : "\x1b[30m",
		Red : "\x1b[31m",
		Green : "\x1b[32m",
		Yellow : "\x1b[33m",
		Blue : "\x1b[34m",
		Magenta : "\x1b[35m",
		Cyan : "\x1b[36m",
		White : "\x1b[37m",

		BgRed : "\x1b[41m",

	}

}

module.exports = UTILS;