// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

goog.provide('goog.ui.registryTest');
goog.setTestOnly('goog.ui.registryTest');

goog.require('goog.object');
goog.require('goog.testing.jsunit');
goog.require('goog.ui.registry');

// Fake component and renderer implementations, for testing only.

// UnknownComponent has no default renderer or decorator registered.
function UnknownComponent() {}

// FakeComponentX's default renderer is FakeRenderer.  It also has a
// decorator.
function FakeComponentX() {
  this.element = null;
}

FakeComponentX.prototype.decorate = function(element) {
  this.element = element;
};

// FakeComponentY doesn't have an explicitly registered default
// renderer; it should inherit the default renderer from its superclass.
// It does have a decorator registered.
function FakeComponentY() {
  FakeComponentX.call(this);
}
goog.inherits(FakeComponentY, FakeComponentX);

// FakeComponentZ is just another component.  Its default renderer is
// FakeSingletonRenderer, but it has no decorator registered.
function FakeComponentZ() {}

// FakeRenderer is a stateful renderer.
function FakeRenderer() {}

// FakeSingletonRenderer is a stateless renderer that can be used as a
// singleton.
function FakeSingletonRenderer() {}

FakeSingletonRenderer.instance_ = new FakeSingletonRenderer();

FakeSingletonRenderer.getInstance = function() {
  return FakeSingletonRenderer.instance_;
};

function setUp() {
  goog.ui.registry.setDefaultRenderer(FakeComponentX, FakeRenderer);
  goog.ui.registry.setDefaultRenderer(FakeComponentZ, FakeSingletonRenderer);

  goog.ui.registry.setDecoratorByClassName(
      'fake-component-x', function() { return new FakeComponentX(); });
  goog.ui.registry.setDecoratorByClassName(
      'fake-component-y', function() { return new FakeComponentY(); });
}

function tearDown() {
  goog.ui.registry.reset();
}

function testGetDefaultRenderer() {
  var rx1 = goog.ui.registry.getDefaultRenderer(FakeComponentX);
  var rx2 = goog.ui.registry.getDefaultRenderer(FakeComponentX);
  assertTrue(
      'FakeComponentX\'s default renderer must be a FakeRenderer',
      rx1 instanceof FakeRenderer);
  assertNotEquals(
      'Each call to getDefaultRenderer must create a new ' +
          'FakeRenderer',
      rx1, rx2);

  var ry = goog.ui.registry.getDefaultRenderer(FakeComponentY);
  assertTrue(
      'FakeComponentY must inherit its default renderer from ' +
          'its superclass',
      ry instanceof FakeRenderer);

  var rz1 = goog.ui.registry.getDefaultRenderer(FakeComponentZ);
  var rz2 = goog.ui.registry.getDefaultRenderer(FakeComponentZ);
  assertTrue(
      'FakeComponentZ\' default renderer must be a ' +
          'FakeSingletonRenderer',
      rz1 instanceof FakeSingletonRenderer);
  assertEquals(
      'Each call to getDefaultRenderer must return the ' +
          'singleton instance of FakeSingletonRenderer',
      rz1, rz2);

  assertNull(
      'getDefaultRenderer must return null for unknown component',
      goog.ui.registry.getDefaultRenderer(UnknownComponent));
}

function testSetDefaultRenderer() {
  var rx1 = goog.ui.registry.getDefaultRenderer(FakeComponentX);
  assertTrue(
      'FakeComponentX\'s renderer must be FakeRenderer',
      rx1 instanceof FakeRenderer);

  var ry1 = goog.ui.registry.getDefaultRenderer(FakeComponentY);
  assertTrue(
      'FakeComponentY must inherit its default renderer from ' +
          'its superclass',
      ry1 instanceof FakeRenderer);

  goog.ui.registry.setDefaultRenderer(FakeComponentX, FakeSingletonRenderer);

  var rx2 = goog.ui.registry.getDefaultRenderer(FakeComponentX);
  assertEquals(
      'FakeComponentX\'s renderer must be FakeSingletonRenderer',
      FakeSingletonRenderer.getInstance(), rx2);

  var ry2 = goog.ui.registry.getDefaultRenderer(FakeComponentY);
  assertEquals(
      'FakeComponentY must inherit the new default renderer ' +
          'from its superclass',
      FakeSingletonRenderer.getInstance(), ry2);

  goog.ui.registry.setDefaultRenderer(FakeComponentY, FakeRenderer);

  var rx3 = goog.ui.registry.getDefaultRenderer(FakeComponentX);
  assertEquals(
      'FakeComponentX\'s renderer must be unchanged',
      FakeSingletonRenderer.getInstance(), rx3);

  var ry3 = goog.ui.registry.getDefaultRenderer(FakeComponentY);
  assertTrue(
      'FakeComponentY must now have its own default renderer',
      ry3 instanceof FakeRenderer);

  assertThrows(
      'Calling setDefaultRenderer with non-function component ' +
          'must throw error',
      function() {
        goog.ui.registry.setDefaultRenderer('Not function', FakeRenderer);
      });

  assertThrows(
      'Calling setDefaultRenderer with non-function renderer ' +
          'must throw error',
      function() {
        goog.ui.registry.setDefaultRenderer(FakeComponentX, 'Not function');
      });
}

function testGetDecoratorByClassName() {
  var dx1 = goog.ui.registry.getDecoratorByClassName('fake-component-x');
  var dx2 = goog.ui.registry.getDecoratorByClassName('fake-component-x');
  assertTrue(
      'fake-component-x must be decorated by a FakeComponentX',
      dx1 instanceof FakeComponentX);
  assertNotEquals(
      'Each call to getDecoratorByClassName must return a ' +
          'new FakeComponentX instance',
      dx1, dx2);

  var dy1 = goog.ui.registry.getDecoratorByClassName('fake-component-y');
  var dy2 = goog.ui.registry.getDecoratorByClassName('fake-component-y');
  assertTrue(
      'fake-component-y must be decorated by a FakeComponentY',
      dy1 instanceof FakeComponentY);
  assertNotEquals(
      'Each call to getDecoratorByClassName must return a ' +
          'new FakeComponentY instance',
      dy1, dy2);

  assertNull(
      'getDecoratorByClassName must return null for unknown class',
      goog.ui.registry.getDecoratorByClassName('fake-component-z'));
  assertNull(
      'getDecoratorByClassName must return null for empty string',
      goog.ui.registry.getDecoratorByClassName(''));
}

function testSetDecoratorByClassName() {
  var dx1, dx2;

  dx1 = goog.ui.registry.getDecoratorByClassName('fake-component-x');
  assertTrue(
      'fake-component-x must be decorated by a FakeComponentX',
      dx1 instanceof FakeComponentX);
  goog.ui.registry.setDecoratorByClassName(
      'fake-component-x', function() { return new UnknownComponent(); });
  dx2 = goog.ui.registry.getDecoratorByClassName('fake-component-x');
  assertTrue(
      'fake-component-x must now be decorated by UnknownComponent',
      dx2 instanceof UnknownComponent);

  assertThrows(
      'Calling setDecoratorByClassName with invalid class name ' +
          'must throw error',
      function() {
        goog.ui.registry.setDecoratorByClassName(
            '', function() { return new UnknownComponent(); });
      });

  assertThrows(
      'Calling setDecoratorByClassName with non-function ' +
          'decorator must throw error',
      function() {
        goog.ui.registry.setDecoratorByClassName(
            'fake-component-x', 'Not function');
      });
}

function testGetDecorator() {
  var dx = goog.ui.registry.getDecorator(document.getElementById('x'));
  assertTrue(
      'Decorator for element with fake-component-x class must be ' +
          'a FakeComponentX',
      dx instanceof FakeComponentX);

  var dy = goog.ui.registry.getDecorator(document.getElementById('y'));
  assertTrue(
      'Decorator for element with fake-component-y class must be ' +
          'a FakeComponentY',
      dy instanceof FakeComponentY);

  var dz = goog.ui.registry.getDecorator(document.getElementById('z'));
  assertNull('Decorator for element with unknown class must be null', dz);

  var du = goog.ui.registry.getDecorator(document.getElementById('u'));
  assertNull('Decorator for element without CSS class must be null', du);
}

function testReset() {
  assertNotEquals(
      'Some renderers must be registered', 0,
      goog.object.getCount(goog.ui.registry.defaultRenderers_));
  assertNotEquals(
      'Some decorators must be registered', 0,
      goog.object.getCount(goog.ui.registry.decoratorFunctions_));

  goog.ui.registry.reset();

  assertTrue(
      'No renderers must be registered',
      goog.object.isEmpty(goog.ui.registry.defaultRenderers_));
  assertTrue(
      'No decorators must be registered',
      goog.object.isEmpty(goog.ui.registry.decoratorFunctions_));
}