var randomString = function (charsCount) {
  var chars = 'abcdefghijklmnopqrstuvwxyz';
  var str = '';
  for (var i = 0; i < charsCount; i++) {
    str = str + chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return str;
};

exports.randomString = randomString;

var randomAppName = function () {
  return 'selftest-app-' + randomString(10);
};

exports.randomAppName = randomAppName;

exports.randomUserEmail = function () {
  return 'selftest-user-' + randomString(15) + '@guerrillamail.com';
};

// Creates an app and deploys it with an old release. 'password' is
// optional. Returns the name of the deployed app.
exports.createAndDeployLegacyApp = function (sandbox, password) {
  var name = randomAppName();
  sandbox.createApp(name, 'empty');
  sandbox.cd(name);

  var runArgs = ['deploy', '--release', '0.7.0.1', name];
  if (password)
    runArgs.push('-P');

  var run = sandbox.run.apply(sandbox, runArgs);

  if (password) {
    // Give it time to download and install a new release, if necessary.
    run.waitSecs(30);
    run.match('New Password:');
    run.write(password + '\n');
    run.match('New Password (again):');
    run.write(password + '\n');
  }

  run.waitSecs(90);
  run.match('Now serving at ' + name + '.meteor.com');
  // XXX: We should wait for it to exit with code 0, but it times out for some reason.
  run.stop();
  return name;
};

exports.cleanUpLegacyApp = function (sandbox, name, password) {
  var run = sandbox.run('deploy', '--release', '0.7.0.1', '-D', name);
  if (password) {
    run.waitSecs(10);
    run.matchErr('Password:');
    run.write(password + '\n');
  }
  run.waitSecs(20);
  run.match('Deleted');
  // XXX same as above, we should be waiting for exit code 0, but the
  // process appears to never exit.
  run.stop();
};

// Creates an app and deploys it. Assumes the sandbox is already logged
// in.
exports.createAndDeployApp = function (sandbox) {
  var name = randomAppName();
  sandbox.createApp(name, 'empty');
  sandbox.cd(name);
  var run = sandbox.run('deploy', name);
  run.waitSecs(90);
  run.match('Now serving at ' + name + '.meteor.com');
  run.waitSecs(10);
  run.expectExit(0);
  return name;
};

exports.cleanUpApp = function (sandbox, name) {
  var run = sandbox.run('deploy', '-D', name);
  run.waitSecs(90);
  run.match('Deleted');
  run.expectExit(0);
  return name;
};

exports.login = function (s, username, password) {
  var run = s.run('login');
  run.waitSecs(2);
  run.matchErr('Username:');
  run.write(username + '\n');
  run.matchErr('Password:');
  run.write(password + '\n');
  run.waitSecs(15);
  run.matchErr('Logged in as ' + username + ".");
  run.expectExit(0);
};

exports.logout = function (s) {
  var run = s.run('logout');
  run.waitSecs(15);
  run.matchErr('Logged out');
  run.expectExit(0);
};