// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

var domready = require('domready');
var test = require('prova');

// Simulates a click event on an element.
function click(elt) {
  if (!elt) {
    throw new Error('Error calling "click": element is undefined.');
  }
  elt.dispatchEvent(new MouseEvent('click', {
    view: window,
    bubbles: true,
    cancelable: true
  }));
}

// Checks that an element contains text.
function contains(elt, text) {
  if (!elt) {
    throw new Error('Error calling "contains": element is undefined.');
  }
  return elt.innerHTML.indexOf(text) >= 0;
}

var chan;

function onReady(cb) {
  domready(function listener() {
    chan = window.page.state.chan;

    if (!chan) {
      // Channel has not loaded yet.  Wait 100ms.
      return setTimeout(listener, 100);
    }

    // Channel has loaded, but is not yet ready.
    if (!chan.ready_) {
      return chan.once('ready', cb);
    }

    // Channel is loaded and ready.
    cb();
  });
}

test('Basic UI elements', function(t) {
  onReady(function() {
    t.ok(contains(document.body, 'Vanadium Chat'), 'header exists');
    t.ok(contains(document.body, 'Enter message'), 'message input exists');
    t.end();
  });
});

test('Members list', function(t) {
  onReady(function() {
    var membersList = document.querySelector('.members ul');
    // NOTE(nlacasse): We check for *at least* one member (as opposed to
    // *exactly* one member) because if you run the tests multiple times in
    // the same browser instance, the old members stick around until they time
    // out of the mounttable, which causes multiple members to be in the list
    // temporarily.
    t.ok(membersList.children.length >= 1, 'at least one member in list');
    t.end();
  });
});

test('Sending a message', function(t) {
  onReady(function() {
    var form = document.querySelector('.compose form');
    var input = form.querySelector('input');
    var button = form.querySelector('button');
    var messages = document.querySelector('.messages');

    var newMessage = 'Hello Vanadium world!';
    input.value = newMessage;

    // NOTE(nlacasse): I tried using React TestUtils to submit the form with
    // Simulate.submit(form) and Simululate.keyPress(input, {key: 'Enter'}),
    // but neither method caused the onSubmit handler the fire.  The only
    // thing I could make work was to create a hidden 'submit' button, and
    // send a fake click there.
    click(button);

    t.equal(input.value, '', 'input is empty after sending message');

    // Wait for the message to be received.
    chan.once('message', function() {
      t.ok(contains(messages, newMessage),
           'message is contained in message list');
      t.end();
    });
  });
});