var exec = require('child_process').exec;
var when = require('when');


function login(credentials) {
  var whenAuthenticated = when.defer();
  var user = credentials.user;
  var pass = credentials.pass;

  var res = {
    user: user,
    cookies: undefined
  };

  console.log('Logging into ' + user);

  var cmd = "./login.sh '"+user+"' '"+pass+"'";
  exec(cmd, function(error, stdout) {
    var cookies = stdout;

    if (!error && typeof cookies === 'string' && cookies.indexOf('B=') === 0 && cookies.length > 200) {
      cookies = cookies.substring(0, cookies.length - 1); // strip newline at end
      res.cookies = cookies;
      whenAuthenticated.resolve(res);
      return;
    }

    console.log('Failed to login into ' + user);
    console.log('error: ', error);
    console.log('output: ', stdout);
    success = false;
    whenAuthenticated.resolve(res);
  });

  return whenAuthenticated.promise;
}