/*
 * Aquarium — composition root.
 *
 * The last file to load, and the only one that knows about all the others.
 * It builds the exhibit, builds the UI, then hands both to the contract
 * adapter. If the adapter were removed, the first two lines would still
 * produce a complete, working aquarium.
 */
(function () {
  'use strict';

  var Shell = window.XZBTShell;

  var announcer = new Shell.Announcer({
    node: Shell.el('announcement'),
    idleText: 'Tank settled \u2014 awaiting instruction.',
    maxLength: 120
  });

  var exhibit = new window.AquariumExhibit({
    canvas: Shell.el('tank-canvas'),
    announcer: announcer
  });

  var ui = new window.AquariumUI(exhibit, announcer);

  /* Contract layer. Optional by construction: everything above already
   * works without it. */
  var core = window.AquariumContract.create(exhibit, ui);

  /* Transport layer. Also optional: with no host attached, nothing here
   * ever fires and the exhibit is unchanged. */
  var transport = new window.XZBTHostTransport({
    core: core,
    onMessage: function (request, response) {
      if (response.type === 'hello.result') {
        Shell.setText(Shell.el('contract-status'), 'host attached');
      }
    }
  });

  exhibit.start();

  window.addEventListener('resize', function () { exhibit.resize(); });

  /* Exposed for the conformance harness and for manual console poking. */
  window.__exhibit = {
    core: core,
    exhibit: exhibit,
    ui: ui,
    transport: transport,
    announcer: announcer
  };
})();