var ConversationV1 = require('watson-developer-cloud/conversation/v1');

function askWatson(payload) {

  var conversation = new ConversationV1({
    username: payload.username,
    password: payload.password,
    version_date: '2017-02-03'
  });

  return new Promise(function(resolve, reject) {
    conversation.message({
      input: { text: payload.text },
      context: payload.context,
      workspace_id: payload.workspace_id
    }, function(err, response) {
      if (err) {
        console.error(err);
        reject(err);
      } else {
        resolve({ output: response.output.text[0] });
      }
    });
  });
}