'use strict';
const { createLogger, format, transports } = require('winston');
require('winston-daily-rotate-file');
const fs = require('fs');
const path = require('path');
const os = require('os');
const env = process.env.NODE_ENV || 'development';
const logDir = __dirname+ '/verbose';

// Create the log directory if it does not exist
if (!fs.existsSync(logDir)) {
  fs.mkdirSync(logDir);
}

const dailyRotateFileTransport = new transports.DailyRotateFile({
  filename: `${logDir}/%DATE%-charcoal-eats.log`,
  datePattern: 'YYYY-MM-DD',
  zippedArchive: true,
  maxSize: '500m',
  maxFiles: '10d',
  format: format.combine(format.json())
});

var errorMeta = {
  hostname: os.hostname(),
  pid: process.pid,
  memory: process.memoryUsage(),
  uptime: process.uptime(),
  env: process.env.NODE_ENV || 'development',
  filename: path.basename(process.mainModule.filename)
};

const logger = createLogger({
  // change level if in dev environment versus production
  level: env === 'development' ? 'debug' : 'info',
  format: format.combine(
    format.errors({ stack: true }),
    format.label({ label: errorMeta }),
    format.timestamp({
      format: 'YYYY-MM-DD HH:mm:ss'
    }),
    format.json()
  ),
  transports: [
    new transports.Console({
      level: 'info',
      format: format.combine(
        format.colorize(),
        format.printf(
          info =>
            `${info.timestamp} ${info.level} ${info.label.env} [${info.label.filename}]: ${JSON.stringify(info.message)} `
        )
      ),
      handleExceptions: true
    }),
    dailyRotateFileTransport
  ]
});

logger.exitOnError = false;

function argumentsToString(v){
  // convert arguments object to real array
  var args = Array.prototype.slice.call(v);
  var message = args[0] ? args[0] : '';
  var meta = [];
  if(args.length > 1){
    for(let i=1; i< args.length; i++){
      if (typeof args[i] === "object"){
        meta.push(JSON.stringify(args[i]));
      }
    }
  }
  var str = { message: message, meta: meta.join(' ') };
  return str;
}


logger.info = function(){
  logger.log.apply(logger, ["info", argumentsToString(arguments)]);
}
logger.warn = function(){
  logger.log.apply(logger, ["warn", argumentsToString(arguments)]);
}
logger.error = function(){
  logger.log.apply(logger, ["error", argumentsToString(arguments)]);
}
logger.debug = function(){
  logger.log.apply(logger, ["debug", argumentsToString(arguments)]);
}
logger.verbose = function(){
  logger.log.apply(logger, ["verbose", argumentsToString(arguments)]);
}

module.exports = logger;