/*
Gets new available Windows license from a .json with a list of MAK keys, updates that db, and executes Windows licensing process with it
Dependencies:
  - node.exe : executable only, no installation needed, put the exe in the same folder of this .js
  - .json : file with licenses:

example json DB:
    {
      "sinUsar": [
        "XXXXX-XXXXX-XXXXX-XXXXX-XXXX1",
        "XXXXX-XXXXX-XXXXX-XXXXX-XXXX2",
      ],
      "usadas": [
        "XXXXX-XXXXX-XXXXX-XXXXX-XXXX3"
      ]
    }

  example of .bat file to execute in a client pc, from a shared network folder where this .js and node.exe are chared
    REM   cd /d %~dp0/licenciarWindows
    net use k: \\SOME-COMPUTER\compartida
    cd /d k:\licenciarWindows
    node.exe licenciarWindows.js
 */


async function main() {

  const fs = require('fs')

  // abrir db de licencias
  const licenciasFile =  __dirname + '/licenciasWin7Pro2018.json'
  let licencias = JSON.parse( fs.readFileSync(licenciasFile, 'UTF8') )

  // conseguir la siguiente licencia sinUSAR
  let unaLicencia = licencias.sinUsar.pop()
    // console.log(unaLicencia)

  // meter la licencia en 'usadas' y guardar bd de licencias actualizada
  licencias.usadas.push( unaLicencia )
  fs.writeFileSync( licenciasFile, JSON.stringify(licencias,null,2).replace(/\n/g, '\r\n'),  'UTF8' )   // use windows CRLF to be notepad.exe friendly

  // licenciar Windows
  execCmdSync(`slmgr /ipk ${unaLicencia}`)
  execCmdSync(`slmgr /ato`)

  // si necesitas cosas asíncronas, así de facil
    // var respuesta = await readLine('¿pregunta?')
    // console.log('pues si', respuesta)

}
main().then(process.exit) // así para poder usar await comodamente en main()



// --------------------------------------------------------- HELPERS
function execCmdSync (command) {
    console.log(command)
    var child_process = require('child_process')
    let result = child_process.spawnSync(
      process.env.comspec,
      `/c ${command.trim()}`.split(' '),
      {stdio: 'inherit'}
    ).status
    console.log(result)
    return result
}


async function readLine (question) {
  const readline = require('readline')

  const rl = readline.createInterface({ input: process.stdin, output: process.stdout })

  let answer = await new Promise(resolve=>{
    rl.question(question + " ", (answer) => {
      rl.close();
      resolve(answer)
    })
  })

  return answer
}