// ==========================================================================
// Project:   SproutCore - JavaScript Application Framework
// Copyright: ©2006-2009 Sprout Systems, Inc. and contributors.
//            portions copyright @2009 Apple Inc.
// License:   Licened under MIT license (see license.js)
// ==========================================================================

var view, content1, content2 ;

module("SC.CollectionView.length", {
  setup: function() {
    
    // stub in collection view to verify that proper method are called
    view = SC.CollectionView.create({
      
      observer: CoreTest.stub('observer(length)').observes('length'),
      computeLayout: CoreTest.stub('computeLayout'),
      
      reset: function(){
        this.observer.reset();
        this.computeLayout.reset();
      }    
    });
    
    content1 = "a b c".w();
    content2 = "d e f g h".w();
  }
});

test("no content should have length of 0", function() {
  equals(view.get('content'), null, 'precond - content is null');
  equals(view.get('length'), 0, 'length should be 0');
});

test("length should be set property on newly inited object with content already set", function() {
  view = SC.CollectionView.create({ content: content1 });
  equals(view.get('length'), content1.get('length'), 'view.length should be content.length');
});

test("setting content should update length & notify", function() {
  view.set('content', content1);
  equals(view.get('length'), content1.get('length'), 'view.length should equal new length');
  view.observer.expect(1);
});

test("changing the content should update length & notify", function() {
  view.set('content', content1);
  view.reset(); // don't care.
  ok(content1.get('length') !== content2.get('length'), 'precond - content1.length should not equal content2.length');
  
  view.set('content', content2);
  
  equals(view.get('length'), content2.get('length'), 'view.length should equal new length');
  view.observer.expect(1);
});

test("modifying content to make it shorter should update view length and notify",function() {
  view.set('content', content1);
  view.reset(); // don't care.
  
  var len = content1.get('length');
  content1.removeAt(1);

  equals(view.get('length'), len-1, 'view.length should equal new length');
  view.observer.expect(1);
});

test("modifying content to add length should update view length and notify",function() {
  view.set('content', content1);
  view.reset(); // don't care.

  var len = content1.get('length');
  content1.insertAt(1, 'foo');

  equals(view.get('length'), len+1, 'view.length should equal new length');
  view.observer.expect(1);
});

test("modifying content so that it does not change the length should NOT change view length OR notify", function() {
  view.set('content', content1);
  view.reset(); // don't care.

  var len = content1.get('length');
  content1.replace(1, 1, 'foo');

  equals(view.get('length'), len, 'view.length should equal new length');
  view.observer.expect(0);
});