const path = require('path');
const fs = require('fs');

const getAppSupportFolder = () => {
  let folder;
  if(process.platform == 'darwin') {
    folder = path.resolve(process.env.HOME, 'Library/Application Support/seedpacket')
  } else if(process.platform == 'win32')  {
    folder = path.resolve(process.env.APPDATA, 'seedpacket')
  } else {
    folder = path.resolve(process.env.HOME, '.local/share/seedpacket')
  }
  return folder;
};



let myLogInternal = (message) => {
  console.log(message);
};

const myLog = (message) => {
  myLogInternal(message);
};

const startLoggingToFile = (logFileName) => {
  const logFilePath = path.join(getAppSupportFolder(), logFileName);
  logStream = fs.createWriteStream(logFilePath, {flags:'a', mode: 0o666});
  myLogInternal = (message) => {
    logStream.write(`\n${new Date().toISOString()} ${message}`);
    console.log(message);
  };
};


function BytesPerSecondGuage() {
  this.totalBytes = 0;
  this.timeslices = {};

  this.getBytesPerSecond = () => {
    const timeslice = Math.round(new Date().getTime()/100);
    let lastSecondBytes = 0;
    Object.keys(this.timeslices).forEach(key => {
      if(key < timeslice - 10) {
        delete this.timeslices[key];
      } else {
        lastSecondBytes += this.timeslices[key].reduce((a,b) => a+b, 0);
      }
    });
    return lastSecondBytes;
  };

  this.recordBytes = (bytes) => {
    const timeslice = Math.round(new Date().getTime()/100);
    this.timeslices[timeslice] = this.timeslices[timeslice] || [];
    this.timeslices[timeslice].push(bytes);
    this.totalBytes += bytes;
  };
}


module.exports = {
  getAppSupportFolder,
  myLog,
  startLoggingToFile,
  BytesPerSecondGuage
};