/**
Author: T31M <t31m@cyberstuff.me>
2019
*/

const { createLogger, format, transports } = require('winston');

const { combine, timestamp, printf, colorize, splat, json } = format;

const maxFunctionLogLength = 60;

const myFormat = printf(({ timestamp, loc, level, message }) => {
  const start = process.hrtime();
  if (loc) {
    return `${timestamp} ${level}: ${message
      .toString()
      .padEnd(105 - level.length)} ${loc.padEnd(60)} log: ${(
      process.hrtime(start)[1] / 1000000
    ).toFixed(2)}ms`;
  }
  return `${timestamp} ${level}: ${message.padEnd(165 - level.length)}  log: ${(
    process.hrtime(start)[1] / 1000000
  ).toFixed(2)}ms`;
});

const preProcessing = format((info, opts) => {
  const stack = new Error().stack.split('\n');
  stack.shift();
  for (elem of Object.values(stack)) {
    elem = elem.toString().trim();
    if (
      elem.indexOf('node_modules') < 0 &&
      elem.indexOf('utils') < 0
    ) {
      info.loc = elem.slice(3, elem.length);
      if (info.loc.length > maxFunctionLogLength) {
        info.loc = `${info.loc.slice(
          0,
          info.loc.indexOf(' '),
        )} -> ${info.loc.slice(
          info.loc.lastIndexOf('\\') + 1,
          info.loc.length - 1,
        )}`;
      }
      return info;
    }
  }
  return info;
});

module.exports.logger = createLogger({
  level: 'debug',
  format: combine(
    colorize(),
    timestamp(),
    // splat(),
    preProcessing(),
    myFormat,
    // json(),
  ),
  // defaultMeta: { service: 'user-service' },
  transports: [
    //
    // - Write to all logs with level `info` and below to `combined.log`
    // - Write all logs error (and below) to `error.log`.
    //
    // new winston.transports.File({ filename: 'error.log', level: 'error' }),
    // new winston.transports.File({ filename: 'combined.log' })
    new transports.Console({ format: format.myFormat }),
  ],
});