/*
** copay-shell - atom shell downloader
*/

var path    = require('path');
var fs      = require('fs');
var GitHub  = require('github-releases');
var async   = require('async');
var readl   = require('readline');
var color   = require('cli-color');
var github  = new GitHub({ repo: 'atom/atom-shell' });
var exec    = require('child_process').exec;
var os      = require('os');

var version = 'v0.13.0';
var target  = path.normalize(__dirname + '/../bin/' + process.platform);


console.log(color.blue('{copay}'), 'ensuring existence of output directory');

ensureOutputTargets();

console.log(color.blue('{copay}'), 'getting atom-shell release ' + version);

github.getReleases({ tag_name: version }, function(err, releases) {

  if (err || !releases.length) {
    return console.log('Release not found');
  }

  switch (process.platform) {
    case 'linux':
      var filename = 'atom-shell-' + version + '-' + process.platform + '-x64.zip';
      break;
    case 'darwin':
      var filename = 'atom-shell-' + version + '-' + process.platform + '-x64.zip';
      break;
    case 'win32':
      var filename = 'atom-shell-' + version + '-' + process.platform + '-ia32.zip';
      break;
    default:
      console.log('platform ' + process.platform + ' not supported');
      process.exit();
  }

  console.log(color.blue('{copay}'), 'looking for prebuilt binary ' + filename);

  for (var a = 0; a < releases[0].assets.length; a++) {
    var asset = releases[0].assets[a];

    if (asset.name === filename) {

      console.log(color.blue('{copay}'), 'downloading ' + asset.name);

      var rl = readl.createInterface({
        input: process.stdin,
        output: process.stdout
      });

      rl.write('      bytes received: 0');

      return github.downloadAsset(asset, function(err, inStream) {
        if (err) {
          console.log(err);
          process.exit();
        }

        var bytes = 0;

        inStream.on('data', function(chunk) {
          rl.write(null, { ctrl: true, name: 'u' });
          rl.write('      bytes received: ' + (bytes + chunk.length));
          bytes += chunk.length;
        });

        inStream.on('end', function() {
          rl.close();
          console.log('');
          console.log(color.blue('{copay}'), 'downloaded!');
        });

        var out       = target;
        var tmp       = os.tmpDir() + '/atom-shell.zip';
        var outStream = fs.createWriteStream(tmp);

        outStream.on('finish', function() {
          console.log(color.blue('{copay}'), 'unzipping archive');
          exec('unzip -o ' + tmp + ' -d ' + out, function(err, stdout, stderr) {
            console.log(err || stderr || (color.blue('{copay}') + ' done!'))
          });
        });

        inStream.pipe(outStream);

      });
    }
  }

});

function ensureOutputTargets() {
  if (!fs.existsSync(target)) fs.mkdirSync(target);
  // if (!fs.existsSync(target + process.platform)) {
  //   fs.mkdirSync(target + process.platform);
  // }
};