import fs from 'fs';

import { ENABLE_LOGGING, LOG_DIR } from './config';

export default class Logger {
  constructor(filename) {
    this.filename = filename;
    this.logStream = null;
  }

  async open() {
    return new Promise((resolve, reject) => {
      if (ENABLE_LOGGING) {
        this.logStream = fs.createWriteStream(`${LOG_DIR}${this.filename}`);
        this.logStream.on('open', resolve(true));
        this.logStream.on('error', reject);
      } else {
        resolve(true);
      }
    });
  }

  log(message, format = msg => msg) {
    console.log(format(message));
    this.logSilent(message);
  };

  logSilent(message) {
    if (this.logStream) {
      this.logStream.write(`${message}\r\n`);
    }
  }

  close() {
    if (this.logStream) {
      this.logStream.end();
    }
  }
}

export const toUSD = money => money.toLocaleString('en-US', { style: 'currency', currency: 'USD' });