#! /usr/bin/env node

const decrypt = require('decrypt-dlc');
const fs      = require('fs');
const isFile  = require('is-file');
const isUrl   = require('is-url');
const path    = require('path');
const program = require('commander');


program
  .version('1.0.0')
  .usage('[options] <file>')
  .option('-o, --output <file>', 'File to store decrypted urls in. (Default: urls.txt)', path.join(process.cwd(), 'urls.txt'))
  .parse(process.argv);

let urls = null;

/**
 * Store the string containing the urls in a file.
 * @param  {String} urls String of urls
 */
function storeUrlsInFile(urls) {
  fs.writeFile(program.output, urls, (err) => {
    if (err) throw err;
    console.log(`Successfully stored urls in ${program.output}`);
  });
}

/**
 * Check if file has a .dlc extension
 * @param  {String}  file path to a file
 * @return {Boolean}      Checks wether if the file is a .dlc file or not
 */
function isDLCFile(file) {
  let ext = path.extname(file);
  return (ext === '.dlc');
}




if (isFile(program.args[0]) && isDLCFile(program.args[0])) {
  decrypt.upload(program.args[0], (err, response) => {
    if (err) throw err;

    urls = response.success.links.join('\n');
    storeUrlsInFile(urls);
  });
} else if (isFile(program.args[0]) && !isDLCFile(program.args[0])) {
  fs.readFile(program.args[0], 'utf-8', (err, content) => {
    if (err) throw err;

    decrypt.paste(content, (err, response) => {
      if (err) throw err;

      urls = response.success.links.join('\n');
      storeUrlsInFile(urls);
    });
  });
} else if (isUrl(program.args[0])) {
  decrypt.container(program.args[0], (err, response) => {
    if (err) throw err;

    urls = response.success.links.join('\n');
    storeUrlsInFile(urls);
  });
} else {
  console.error('Parameter must be url or path to a file.');
}